JP5963355B2 - Manufacturing method of metal round cross-section wire, manufacturing method of nickel-free austenitic stainless steel round cross-section wire, manufacturing method of round cross-section wire for welding wire / resistance / heating wire, manufacturing method of round cross-section wire for resistance / heating wire - Google Patents

Description

  The present invention relates to a method for producing a metal round cross-section wire capable of producing a metal round cross-section wire having no surface damage by forming a round cross-section wire from a strip, and a metal round cross-section wire obtained by this production method. , Nickel-free austenitic stainless steel round cross-section wire, welding wire / resistance / heat wire round cross-section wire

  Until now, some metal round cross-section wires have not been distributed to the general market, for example, the wire to be treated when trying to obtain nickel-free austenitic stainless steel wire by solid-phase nitrogen absorption treatment is generally Not distributed in the market. In addition, a welding wire for fastening a high temperature oxidation resistant ferritic stainless steel sheet used in a reformer for a fuel cell is not distributed in the general market.

  As a conventional method for producing a metal wire, a forged round bar-shaped billet is hot-rolled and cold-rolled, and then a wire-making lot material drawn by a hole die is sequentially specified by a wire drawing machine. The method of pulling out to the thinness of is adopted.

  In this case, in the case of a component billet with a small amount of demand as a wire, a steel maker cannot manufacture a wire-making lot material, only a plate material. Therefore, the steel wire of the same component system as the plate material does not circulate in the market, and when welding the plate material, the actual situation is that the weld wire having the similar component is unavoidably used.

  Patent Document 1 is characterized in that a thin plate material is separated after forming a V-groove symmetrically using a V-groove rolling roll, and a cross-section of a vertical line target provided with a slope composed of a plurality of fold lines. A metal wire is disclosed. However, in Patent Document 1, although it has been described that a cut wire having a vertically symmetric cross section is formed by a rolling roll, it is formed to a round cross section, and in particular, a round cross section wire having no defects on the surface or surface layer is obtained. The method has not been reached.

  Further, Patent Document 2 discloses a technique for roller-forming a square cross-sectional material obtained by cutting a thin plate into a predetermined width for difficult-to-work materials such as titanium material, which is extremely low in efficiency by this method. In this patent document 2, in the process of forming a wire having a round cross section from a plate material slit, it is proposed to pass a peeling die or to perform surface polishing in order to remove a winding flaw, The detailed method to solve it is not clarified. Further, Patent Document 3 discloses a technique in which a rectangular cross-section material obtained by cutting a thin plate into a predetermined width is rolled by a groove roller. Further, Patent Document 4 discloses a technique for peeling after groove roller forming.

JP 7-112201 A Japanese Patent Publication No. 1-26763 Japanese Patent Laid-Open No. 7-204709 Japanese Patent Laid-Open No. 9-276901

  However, when obtaining a round cross-section thin wire by rolling a semi-circular groove or drawing and drawing with a round hole die from a square cross-section material obtained by cutting a thin plate into a predetermined width, a square corner The part is formed into a round shape while being collapsed and rolled in the process of shifting to a round shape. Therefore, innumerable wrinkles remain on the surface of the final finish line, particularly on the line where the corners are laid down. Even if the apparent surface flaw cannot be confirmed by wire drawing, problems such as internal defects and surface delamination always occur due to the properties of plastic working. In particular, in the case of a quadrangular cross-sectional shape obtained only by normal shearing, since the angle of the corner is sharp, it is easily collapsed and drawn by drawing, so that many large wrinkles are generated on the surface of the final finished wire diameter. . These problems cause new problems such as breakage, increased internal defects, and increased surface damage in the next process such as bending, forging, and rolling.

  These problems have many adverse effects when the wire is used in various applications. For example, when it is used for a mechanical structure, it causes a lack of design strength, and when it is used for a medical device, it causes a medical accident. In addition, it causes aesthetic loss due to surface layer defects when used for decorative materials, and when used for members such as heating wires and resistance wires, the defective part causes an increase in electrical resistance and causes a short circuit. Cause.

  In addition, a method has been proposed in which the surface layer portion is scraped off by a peeling die having a hole diameter slightly smaller than the diameter of the wire rod at the initial or intermediate stage of the wire rod forming as a countermeasure against the falling-in and wound damage. However, it is difficult to cut the corners evenly in the case of a square cross-section material, and in the case of a relatively thin wire rod with a wire diameter of 2 mm or less, on the contrary, the wire breakage caused by the biting of the peeling die blade, There is a problem that the scratches are left until the final finish due to the biting scratches. When processing is performed in consideration of these problems, the processing efficiency is significantly reduced. Therefore, the peeling process alone has a limit in its effect.

One of the promising uses of metal round cross-section wires is nickel-free austenitic stainless steel wires.
In Europe, regulations on the use and distribution of products that are in direct and long-term contact with the skin are established in Europe, and these products have a nickel elution amount of 0 for daily use for at least two years. Cannot be used unless guaranteed to exceed 5 μg / cm ² / week. Since such regulations are expected to be made in Japan in the future, nickel-free austenitic stainless steel is an innovative material that can meet these regulations in the field of applicable accessories and medical devices. There is a strong demand for lines.

The most promising method for producing nickel-free austenitic stainless steel wire is the addition of nitrogen as an alternative to nickel, using the pressure-dissolved nitrogen addition method at the steelmaking stage, and Fe-20-30Cr steel as the base material. A method for absorbing solid-phase nitrogen has been studied, but there is no practical example. While the Fe-20-30Cr wire rod which becomes the base material of the nickel-free austenite wire is not generally distributed in the market, the Fe-20-30Cr steel for the steel plate strip material exists.
Therefore, in order to put the nickel-free austenitic steel wire material that is strongly demanded in the world into practical use, the wire material that has been continuously cut into a square section from the Fe-20 to 30Cr steel plate strip material in general circulation is subjected to continuous nitrogen absorption treatment. If nickel-substitute nitrogen is added and then a wire with a round cross-section can be drawn, a nickel-free austenite wire with excellent surface accuracy and no surface flaws can be obtained, which is particularly required for jewelry and medical device materials. It is considered possible.

Another example that has been studied as an application of a wire is a welding wire for fastening a high-temperature oxidation resistant ferritic stainless steel plate used in a reformer for a fuel cell.
In recent years, stationary fuel cells that have been developed and put to practical use, especially solid oxide fuel cells (SOFCs), have a high temperature of 900 to 1000 ° C. so as to be suitable for the reforming reaction in the reforming section. To be heated.

  The reforming section has a structure including a combustion chamber in which a combustion flame is generated, a gas passage through which a reformed gas such as hydrogen or carbon monoxide passes, a steam passage for reforming reforming fuel, and the like. As the plate material to be used, an aluminum-containing ferritic stainless steel plate having a small thermal expansion coefficient and excellent oxidation resistance and chromium evaporation resistance is used for the severe conditions in each layer environment.

  However, in order to produce the above cylindrical body using a steel sheet having excellent characteristics, welding work is required for joining the steel sheets. Regarding the welding process, a welding wire of the same component is used. Since it is not generally available on the market, the current situation is to use a SUH steel welding wire having the closest component value. Although this welding wire can be used for fastening without any problem, there is a drawback that the welded portion is deteriorated first in comparison with the steel plate portion in terms of long-term durability.

  Therefore, in order to obtain a welding wire having the same component composition as the steel sheet coil used in the structure, it is extremely useful if a wire rod continuously cut into a square cross section from the steel plate strip can be finished into a round cross section wire. is there.

  The present invention has been made in consideration of such circumstances, and a thin plate is determined on the assumption that it is applied to a nickel-free austenite wire or a welding wire having the same component composition as a steel plate coil used in a structure. By using a processing technology to form a rectangular cross-section material obtained by cutting into a width into a round cross-section, there is no surface flaw and excellent dimensional accuracy by eliminating collapsed entrainment scratches generated on the surface of the wire. It aims at providing the manufacturing method of the metal round section wire which can manufacture.

  In order to solve the above problems, a method for producing a metal round cross-section wire according to the present invention is obtained by a slitting process in which a rolled metal strip is continuously slit in the longitudinal direction, and the slitting process. In addition, a drawing process for a wire having a polygonal cross section with 8 or more corners, a peeling process for removing a layer of a corner portion that is crushed and drawn by the drawing process, and a wire cross section A combined processing step consisting of a polishing process for polishing the outer peripheral surface, the combined processing step is continuously repeated in the longitudinal direction of the wire, and then the drawing and drawing are performed until the diameter of the wire reaches a predetermined diameter. It is characterized by processing with a wire.

  A wire rod with a polygonal cross section with 8 or more corners obtained by the slitting process is subjected to drawing and drawing to crush the corners into a thin layer, and the wrinkles are generated by peeling. Strip off the underlying thin layer. After that, the part where the peeling blade does not reach by polishing, that is, the seam between the arc part and the flat part after contacting the circular die is smoothed, and the peeled part is smoothed. By repeating these combination processes until there are no deep scratches on the outer periphery of the cross section of the wire rod, and thereafter performing drawing, a metal round cross section wire rod having excellent surface properties and less wrinkles can be obtained.

  In the method for producing a metal round cross-section wire according to the present invention, the slitting step includes a groove processing step of forming grooves symmetrically with a pair of front and back V-shaped rolls or rolls with R, and a blade side and a holding side. Using a shear roll having an angle or R, shearing from the top groove apex to the back groove apex without breaking the inclination angle of the groove to form a polygonal cross-section wire having 8 or more corners; Can consist of

  If a non-angled shear roll is used after the groove is formed by the grooving process, the groove is deformed and the wire becomes distorted, but a shear roll having an angle or R on the blade side and the restraining side is used. As a result, the shape of the groove can be prevented and a wire having a beautiful cross-sectional shape can be obtained.

  In the method for producing a metal round cross-section wire according to the present invention, the slitting step includes a groove processing step of forming grooves symmetrically with a pair of front and back V-shaped rolls or rolls with R, and a blade side and a holding side. Using a shear roll having an angle or R, a first shearing step of cutting halfway from the top groove top to the back groove top without breaking the groove inclination angle; and the V-shaped roll or the R-attached roll It is composed of a second shearing process for pressing from the reverse direction to half of the wire cross section, and a rolling flat roll separation process for forming a polygonal cross-section wire having 8 or more corners by rolling with a flat roll. Can be.

  By performing the first shearing process, the second shearing process, and the rolled flat roll separating process, it is possible to prevent the occurrence of flash on the shearing surface.

  In the method for manufacturing a metal round cross-section wire according to the present invention, the combination processing step is the same until the diameter of the wire becomes a circular diameter of 80% or more and 95% or less of the thickness of the metal strip before slitting. It is continuously performed on the line, and the cross-section reduction rate in the drawing and drawing process is 1% or more and 20% or less. The amount of peeling in the peeling process is less than the diameter of the wire before the peeling process. The diameter of the subsequent wire rod is reduced in the range of 0.001 mm or more and 0.1 mm or less, and the drawing wire drawing performed after the combination processing step is performed in such a manner that the wire rod diameter is the thickness of the metal strip. Until the dimension wire diameter is 75% or less of the above, the cross-sectional reduction rate can be 1% or more and 20% or less.

  In the slitting process, uneven portions are formed on the shear surface. Also, in drawing wire drawing, the flat portion of the wire is compressed inward, so this part is in a concave state, and there is a part where the dimension is reduced from the initial plate thickness dimension To do. Furthermore, when the flat part of the wire is compressed inward, the surface becomes a bowl-like shape, and unevenness due to this is also generated. Therefore, in order to obtain a wire having a good surface, it is necessary to remove these irregularities. However, the combination processing step is performed in which the diameter of the wire is 80% or more of the thickness dimension of the metal strip before slitting 95. These irregularities can be removed by carrying out until the circular diameter dimension is less than or equal to%. When each unevenness is severe, it is preferable to make it closer to 80%.

  Further, by performing the subsequent drawing and drawing until the wire diameter reaches a dimension wire diameter of 75% or less of the metal strip thickness dimension, the stripped wire traces and the polishing in the longitudinal direction of the wire material generated in the preceding stage are performed. It is possible to level the polishing marks by processing and finish the surface smoothly. If these linear traces are deep, it is preferable to carry out until the value becomes smaller.

  In the method for producing a metal round cross-section wire according to the present invention, in the polishing process, polishing cloths having a surface roughness of 20 to 1000 are arranged at least vertically and horizontally with respect to the surface of the wire to be polished. It is preferable to carry out.

  In the initial state where the shape of the wire is not a round cross section and the unevenness and wrinkles are deep, a large amount of polishing can be taken. As the shape approaches, a metal round cross-section wire with excellent surface properties can be obtained by final finishing using a fine one close to # 1000. It is preferable to dispose the polishing cloth at least up, down, left, and right, and further at an angle, since the entire circumference of the wire cross section can be polished. Further, the linear feed speed can be increased as the polishing cloth is increased.

  In the method for producing a metal round cross-section wire of the present invention, the tip angle of the V-shaped roll or the roll with R is 30 ° to 120 °, and the blade angle of the shear roll is 15 ° to 60 °. The holding angle of the shear roll is preferably 15 ° or more and 60 ° or less.

  When the V-shaped tip angle of the cutting blade is 30 ° or less, the blade may be damaged due to insufficient rigidity of the blade. Further, if the V-shaped tip angle of the cutting blade is 120 ° or more, the surface pressure is excessively applied and the blade does not enter the workpiece, which is meaningless. Therefore, it is preferable that the V-shaped tip angle of the cutting edge is 30 ° or more and 120 ° or less.

  When the cross section of the wire obtained by the slitting process is a regular octagon, the tip angle of the V-shaped roll or the roll with R is 90 °. In order to make the cross section of the wire into a polygon with more than 8 corners, 1 pressure is 120 °, 2 pressure is 60 °, 3 pressure is 30 °, etc. In addition, it is possible to use a V-roll having a large angle.

  According to the above method, in the slitting step, a wire having a polygonal cross section with 8 or more corners can be formed, and this wire is made by making the wire cross section into a polygonal shape with 8 or more corners. However, when the above-described combination processing is performed to obtain a wrinkle-free round cross-section wire, there is no great burden on the combination processing.

In the method for producing a metal round cross-section wire according to the present invention, a plurality of sets of the V-shaped roll or the roll with R and the shear roll are installed in parallel, and several polygons at a time with a polygonal number of 8 or more. It can be made possible to form a shaped cross-section wire.
Thereby, the production efficiency in a slitting process can be raised.

The metal round cross-section wire of the present invention is a metal round cross-section wire manufactured by the method for manufacturing a metal round cross-section wire of the present invention, and is characterized by having no entrainment flaws.
Since it is manufactured by the manufacturing method of the metal round cross-section wire of this invention, the wire of the component currently lined up only as a board | plate material can be obtained in elongate.

  The nickel-free austenitic stainless steel round section wire of the present invention is manufactured by the method for producing a metal round section wire of the present invention, C: 0.06 mass% or less, Ni: 0.6 mass% or less, Cr: 20.0 To 25.0 mass%, Mo: 1.0 to 1.5 mass%, N: 0.02 mass% or less, Ti: 0.05 to 0.5 mass%, Nb: 0.1 to 0.6 mass% %, And the balance is obtained by subjecting it to solid-phase nitrogen absorption treatment using a ferritic stainless steel strip made of Fe and inevitable impurities as a raw material.

  Since it is manufactured by the method for manufacturing a metal round cross-section wire according to the present invention, it is possible to obtain a nickel-free austenite wire with no surface scratches and excellent dimensional accuracy. Therefore, it can be applied to the fields of jewelry and medical equipment.

  The round cross-section wire for welding wire, resistance, and heating wire of the present invention is produced by the method for producing a metal round cross-section wire of the present invention, C: 0.06% by mass or less, Si: 1.0% by mass or less, Mn: 1.0 mass% or less, P: 0.050 mass% or less, S: 0.03 mass% or less, Ni: 2.0 mass% or less, Cr: 16-20 mass%, Al: 1-6 mass %, Ti: 0.5% by mass or less, N: 0.06% by mass or less, the balance being Fe and inevitable impurities, and if necessary, a ferritic stainless steel steel strip containing a rare earth element can be obtained as a raw material. It is characterized by this.

Since it is manufactured by the method for manufacturing a metal round cross-section wire according to the present invention, there is no surface flaw, and the defective portion does not cause an increase in electrical resistance and cause a short circuit. Therefore, it can be effectively used as a member such as a heating wire or a resistance wire.
Moreover, it can be effectively used as a welding wire for fastening a high temperature oxidation resistant ferritic stainless steel plate used in a reformer for a fuel cell.

  The round wire for resistance and heating wire of the present invention is produced by the method for producing a metal round cross-section wire of the present invention, C: 0.08% by mass or less, Si: 2.0-5.0% by mass, Mn : 1.0 mass% or less, Cu: 2.0 mass% or less, P: 0.050 mass% or less, S: 0.03 mass% or less, Ni: 10.0-15.0 mass%, Cr: 15 0.022.0% by mass, Nb: 0.05-0.25% by mass, N: 0.06% by mass or less, and an austenitic stainless steel strip made of Fe and inevitable impurities is obtained as a raw material. It is characterized by this.

  Since it is manufactured by the method for manufacturing a metal round cross-section wire according to the present invention, there is no surface flaw, and the defective portion does not cause an increase in electrical resistance and cause a short circuit. Therefore, it can be effectively used as a member such as a heating wire or a resistance wire.

  According to the present invention, in obtaining a round cross-section wire from a strip material, the corner of the rectangular cross-section wire obtained from slitting is brought down and rolled in the process of being transferred to a round cross-section, resulting in surface defects and surface layer defects. Therefore, it is possible to manufacture a wire having no surface scratches and excellent dimensional accuracy. As a result, a component-based metal round cross-section wire that is not distributed in the general market can be obtained from the strip material.

(A) is a figure which shows the outline of the slitting process in the manufacturing method of the metal round cross-section wire which concerns on embodiment of this invention, (b) is the structure and arrangement | positioning of a V-shaped roll used in a V-groove processing process. (C) is a figure which shows the structure and arrangement | positioning of a shear roll used in a shearing process. (A) is a figure which shows the shape of a V-shaped blade, (b) is a figure which shows the shape of a shear blade. (C), (d) is a modification of (a), (b). It is a figure which shows the detail of a V-groove process. It is a figure which shows the detail of a shearing process. It is a figure which shows a 2nd shearing process and a rolling flat roll separation process. It is a figure which shows the case where a V-shaped roll of a single angle V shape is used in steps in a V-groove processing step. It is a figure which shows the process of obtaining a polygonal cross-section wire with a shear roll after the process shown in FIG. It is a figure which shows the example which changed the front-end | tip angle of the V-shaped blade of a V-shaped roll in steps. It is a figure explaining the detail of a drawing drawing process, a peeling process, and a grinding | polishing process. It is a figure which shows the detail of wire drawing for every pass, and continuous wire drawing. It is a figure explaining the longest diagonal of a wire cross section. It is a figure explaining the longest diagonal of a wire cross section. It is a figure explaining the transition of the entrainment layer by drawing wire drawing and polishing.

Below, the manufacturing method of the metal round-section wire of this invention is demonstrated based on the embodiment.
FIG. 1A shows an outline of a slitting process in the method for manufacturing a metal round cross-section wire according to the embodiment of the present invention. In addition, in the following description, the case where the cross section of a metal round cross-section wire becomes an octagon is illustrated, but if the shape of the cross section of the metal round cross-section wire is a polygonal shape having 8 or more corners, this It is not limited to. Moreover, although the case of the V groove processing process which forms the front and back V groove with a V-shaped roll is illustrated, a roll with R can also be used so that it may demonstrate later. Therefore, it is grasped as a grooving process using a V-shaped roll or a roll with R, and means a preliminary cut surface forming process.

  The material plate coil 1, which is a rolled metal strip, is slitted by a slitting device 2 to become an octagonal cross-section wire 3 and a material plate coil remainder 4 is obtained. The material plate coil residue 4 is repeatedly slitted by the slitting device 2, and the octagonal cross-section wire 3 is sequentially manufactured.

  Slitting processing in the slitting apparatus 2 is performed by using a V-groove processing step 5 in which front and back V-grooves are formed by a pair of front and back V-shaped rolls, and a shearing roll having an angle on the blade side and the restraining side. A first shearing step 6 for making a cut halfway from the top V-groove apex to the backside V-groove apex without breaking the corner, and a second shearing step 7 for pressing the shear roll from the reverse direction to half of the line cross section, It comprises a rolling flat roll separating process 8 for forming an octagonal cross-section wire by rolling with a rolling flat roll.

  Alternatively, the slitting process in the slitting apparatus 2 can be simplified by using a V-groove processing step 5 for forming front and back V-grooves with a pair of front and back V-shaped rolls, and a shear roll having angles on the blade side and the restraining side. It is possible to use a shearing process in which an octagonal cross-section wire is formed by shearing from the top V groove apex to the back V groove apex without breaking the inclination angle of the V groove.

  FIG. 1B shows the structure and arrangement of the V-shaped roll 11 used in the V-groove machining step 5. A V-shaped roll 11 is arranged in a pair of front and back with respect to the material plate coil 1, and the V-shaped roll 11 has a V-shaped blade 12. Front and back V-grooves are formed in the material plate coil 1 by the V-shaped blade 12. This process will be described in detail later.

  FIG. 1C shows the structure and arrangement of the shear roll 13 used in the shearing process. A shear roll 13 is arranged in a pair of front and back with respect to the material plate coil 1, and the shear roll 13 has a shear blade 14. An octagonal cross-section wire 15 is formed at both ends of the material plate coil 1 by the shearing blade 14. This process will be described in detail later.

FIG. 2A shows the shape of the V-shaped blade 12, and FIG. 2B shows the shape of the shearing blade 14.
The V angle α, which is the tip angle of the V-shaped blade 12, is 30 ° or more and 120 ° or less, and is 90 ° in FIG. The blade angle β of the shear blade 14 is not less than 15 ° and not more than 60 °, and is 45 ° in FIG. The restraining angle γ of the restraining portion 16 of the shearing blade 14 is not less than 15 ° and not more than 60 °, and is 45 ° in FIG. These blades can be formed using high-speed steel (quenched), die steel (quenched), carbide, ceramic, or the like.

2 (c) and 2 (d) show modified examples of FIGS. 2 (a) and 2 (b).
FIG. 2C shows a roll with R corresponding to a modified example of the V-shaped roll 11, which is a modified example of the cutting blade used in the V-groove machining step 5, and has a curved surface having a predetermined curvature radius R. Is formed. FIG. 2D shows a modification of the shearing blade 14 in which a curved surface having a predetermined radius of curvature R is formed.

3A, 3B, 3C and 3D show details of the V-groove processing step. 3 (e), (f), (g), and (h) show details of both ends of the material plate coil 1. FIG.
As shown in FIG. 3, a pair of front and back V-shaped rolls 11 are located at a position of thickness dimension × 1.0 to thickness dimension × 1.3 from the end of the strip of the material plate coil 1 that is a rolled metal strip. And the tip of the V-shaped blade 12 of the V-shaped roll 11 is brought into contact with the material plate coil 1 from above and below, and at the positions of the front and back severing lines at both ends of the material plate coil 1, Upper V-shaped groove 17 and lower V-shaped groove 18 are formed to a depth of 0.1 to 0.45 times the thickness dimension of material plate coil 1.

  The V-shaped roll 11 may be made of a material having a hardness higher than that of the material to be rolled, but if it is too hard, the cutting edge tends to be damaged. Moreover, when too soft, it will lead to abrasion of a blade edge | tip. Therefore, it is preferable to use properly according to the material to be rolled.

4A, 4B, 4C, and 4D show details of the shearing process. 4 (e), (f), (g), and (h) show details of both end portions of the material plate coil 1. FIG.
In the shearing process, a shear roll having an angle on the blade side and the holding side is used, and the inclination angle of the V groove formed in the preliminary cutting surface forming process is not broken, and the top V groove apex to the back V groove apex. The purpose is to obtain a polygonal cross-section wire by shearing.
The shear roll 13 includes a holding portion 16a having an angle that matches the V groove formed by the preliminary cutting surface forming process on the opposite side of the surface of the shear blade 14a.

  As shown in FIG. 4, the tip of the shearing blade 14 a of the shear roll 13 contacts the inclined surface 17 a of the upper V-shaped groove 17 from above with respect to the material plate coil 1, and the material plate coil 1 From the downward direction, the tip of the shearing blade 14 b of the shear roll 13 contacts the inclined surface 18 a of the lower V-shaped groove 18. As a result, at both ends of the material plate coil 1, shearing is performed from the top of the front surface V-shaped groove to the top of the back surface V-shaped groove. In this way, the blade tip of the shear roll 13 is aligned with the deepest part of the V-groove formed by the preliminary cutting surface forming process, and the blade tips of the upper and lower shear rolls 13 are lapped by 0 mm to 0.2 mm for shear separation. Is done.

  The shear roll 13 has a shearing blade 14 and a restraining portion 16, and when shearing, the restraining portion 16 a contacts the inclined surface 17 b of the upper V-shaped groove 17, and the restraining portion 16 b becomes the lower V-shaped groove 18. Therefore, even in the final shearing position, shearing is possible without breaking the 45 ° inclined line of the V-shaped groove formed in the V-groove processing step. Therefore, the octagonal cross-section wire 15 can be obtained by the above process. Thus, at the time of shear separation, the holding portion of the shear roll 13 has an angle that matches the pre-formed V-groove, and thus shears without breaking the pre-formed V-groove shape. be able to.

  When shearing in only one direction, defects such as flash and burrs are likely to occur on one side. In such a case, it is preferable to perform shearing in two steps. For example, it is possible to use a method in which the side to be a wire is pushed up to 60% up to shear separation in the first step and sheared down in the second step. Alternatively, it is further divided into the third step, the same as the above in the first step, the second step is also suppressed to about 60% until the shear separation, and the roll is separated with a flat roll in the third step, A better shear surface is obtained.

  In the shearing process, when the burrs are remarkably generated at the corners, the shear shown in FIG. 4 is limited to 2/3 in the middle of the line cross section to be the first shearing process 6, and the second shown in FIG. A shearing process 7 and a rolled flat roll separating process 8 are performed.

  The details of the second shearing process 7 are shown in FIGS. 5E and 5F show details of both end portions of the material plate coil 1. FIG. The second shearing process 7 should be called a reverse shearing process, and is performed by pressing the shear roll 13 from the direction opposite to that shown in FIG. 4 to half the line cross section.

  As shown in FIGS. 5A, 5B, 5E, and 5F, the tip of the shearing blade 14a of the shearing roll 13 is located on the upper V-shaped groove 17 from above with respect to the material plate coil 1. The tip of the shearing blade 14 b of the shear roll 13 contacts the inclined surface 18 b of the lower V-shaped groove 18 from below with respect to the material plate coil 1. That is, in the second shearing process 7, the shear blades 14 a and 14 b are brought into contact with the upper V-shaped groove 17 and the lower V-shaped groove 18 in the direction opposite to that of the first shearing process 6, thereby Press halfway.

5C and 5D show details of the rolling flat roll separating process 8. 5 (g) and 5 (h) show details of both end portions of the material plate coil 1. FIG. As shown in FIGS. 5C and 5D, the rolling flat roll 19 comes into contact with the material plate coil 1 and rolls from above. As a result, as shown in FIGS. 5 (g) and 5 (h), cracks 20 are generated and separated between the line cross sections at both ends of the material plate coil 1, and an octagonal cross section wire 15 is obtained. Burr-free shearing can be performed by the above process.
When a plurality of sets of V-shaped rolls 11 or R-attached rolls and shear rolls 13 are installed in parallel, a polygonal cross-section wire having several strips and 8 or more corners can be formed at a time.

Formation of the upper V-shaped groove 17 and the lower V-shaped groove 18 may be performed by one rolling, or may be performed by rolling several times depending on the polygonal shape desired.
FIG. 6 shows a case where a single-angle V-shaped roll is used step by step in the V-groove machining step 5.
For the material plate coil 1 having a plate pressure of 1.2 mm, in the first pressure (a), a V-shaped blade 12a having a tip angle of 120 ° is used to form a groove having a depth of 0.2 mm and an angle of 120 °. To do. Next, in the second pressure (b), a groove having a depth of 0.35 mm and an angle of 60 ° is additionally formed using a V-shaped blade 12b having a tip angle of 60 °. Further, in (c) of the third pressure, a groove having a depth of 0.5 mm and an angle of 30 ° is additionally formed using a V-shaped blade 12c having a tip angle of 30 °. As a result, each of the upper V-shaped groove 17 and the lower V-shaped groove 18 has a shape in which the angle changes in steps of 120 °, 60 °, and 30 °, and the pre-cut surface having a larger corner angle and closer to a circle. Can be obtained.

  FIG. 7 shows a step of obtaining the polygonal cross-section wire 15a by the shear roll 13 after the step shown in FIG. FIG. 8 is a graph in which the tip angle of the V-shaped blade 12 of the V-shaped roll 11 is changed in stages, and the tip angles are 30 °, 60 °, and 120 ° in order from the tip side.

  Based on FIG. 9, details of the drawing wire drawing process, the peeling process, and the polishing process will be described. In the present invention, for a wire having a polygonal cross section with 8 or more corners, a combined processing step consisting of drawing, stripping, and polishing is continuously repeated in the longitudinal direction of the wire. Subsequently, it is processed by drawing and drawing until the diameter of the wire becomes a predetermined diameter.

  As shown in FIG. 9A, the drawing wire drawing process is performed using the drawing die 21 by using the octagonal cross-section wire 3 obtained by the slitting process as a raw material. Next, in order to remove the corner layer that has been crushed and drawn by the drawing and drawing process, a peeling process is performed using a peeling die 23. Next, a polishing process for polishing the outer peripheral surface of the wire rod cross section is performed. The polishing process is effective for the portion where the peeling blade does not reach during the peeling process, and the surface roughness is 20th or more and 1000th or less with respect to the surface of the wire to be polished. The polishing cloth 22 is disposed at least vertically and horizontally, and the polishing cloth 22 is rotated to perform the polishing process so as to hit the entire surface of the wire. Thereafter, the film is wound up via a capstan roll 25.

  FIG. 9B shows the details of the drawing and drawing with the drawing die 21, and is equivalent to 80% or more and 99% or less of the area of the circle whose diameter is the longest diagonal distance of the cross section of the octagonal cross section wire 3. A diameter circular die is used. The concept of the area of a circle whose diameter is the distance of the longest diagonal of the cross section will be described in detail later. By this drawing and drawing, the cross-sectional reduction rate of the octagonal cross-section wire 3 in the drawing and drawing becomes 1% or more and 20% or less. That is, if the cross-sectional area of the wire 24a before drawing is A and the cross-sectional area of the wire 24b after drawing is B, B is 0.8 to 0.99 times A. The drawing die 21 is formed using diamond or carbide.

In the first pass of drawing and drawing, the drawing is continuously drawn in the longitudinal direction using a diameter circular die that is equal to or greater than 85% and 99% of the area of the circle whose diameter is the longest diagonal distance of the wire cross section. I do. In the second pass of the drawing and drawing process, the drawing process is continuously performed in the longitudinal direction using a diameter circular die that is 80% to 99% of the circle area of the peeling die used for the peeling process. .
The factor that determines the diameter of the circular die is determined by the amount of peeling to be performed next. When the amount of peeling (depth) from the surface of the wire to be peeled next is very small, a large diameter circular die is used, and when the amount of peeling (depth) is large, a small diameter circular die is used.

  FIG. 9C shows the details of the peeling process by the peeling die 23. Peeling is intended to remove the surface layer that has been drawn in the drawing wire process and causes entrainment flaws, and is 0.005 mm to the die hole diameter used in the drawing wire drawing process. A peeling die 23 having a small hole diameter of 0.1 mm is arranged concentrically with the drawing die 21 and the circumferential surface layer portion is evenly cut off. The amount of peeling in the peeling process is such that the diameter of the wire 24d after the peeling process is reduced in the range of 0.001 mm or more and 0.1 mm or less than the diameter of the wire 24c before the peeling process.

FIG. 9D shows the configuration of the polishing cloth 22. If the cross-sectional shape of the wire is circular from the beginning, the surface layer can be removed uniformly by the peeling process, but if the cross-sectional shape of the wire is polygonal, it is removed by the peeling die 23 until it reaches a circular shape. Some parts cannot be created. The purpose of the polishing process is to remove a portion that cannot be removed by the peeling die 23 in this initial stage, and the polishing process is performed so that the polishing cloth of particle size # 20 to # 1000 is rotated and hits the entire surface of the wire. .
A polishing cloth 22 is arranged vertically and horizontally with respect to the surface of the wire 24 to be polished, and is rotated by a motor. When the polishing cloth 22 hits the four sides of the wire rod 24, the entrainment layer is scraped off. Since the polishing cloth 22 is rich in flexibility compared with the polishing grindstone, the entire circumference of the wire rod 24 can be polished without any problem.

  Thus, the polishing cloth 22 is arranged at least vertically and horizontally toward the wire cross section and is placed so as to hit the entire surface of the wire, and since it is a cloth material, it can flexibly contact the wire surface arc. Further, as the number of installation places of the polishing cloth roll 22 increases, such as every 45 ° or every 22.5 °, the stability of polishing increases. As a result, the wire feed speed can be increased, leading to improved surface quality and improved processing efficiency.

  The polishing cloth 22 is preferably made finer gradually from the initial stage of the combined drawing process of drawing drawing + peeling + polishing to the stage where the combined processing process is completed. In the initial stage of the wire drawing process, the surface winding layer is large and the surface has many irregularities. Therefore, by using a rougher one, it is possible to increase the scraping efficiency of the winding layer. As the finished wire diameter approaches, there is a risk that a coarse polishing cloth 22 may leave polishing marks, and the entrainment layer becomes thinner and smaller, so the grain size can be gradually reduced. In order to improve the surface quality, it is preferable.

  The above-described combination processing step is continuously performed on the same row until the diameter of the wire becomes a circular diameter of 80% or more and 95% or less of the thickness of the metal strip before slitting. The drawing and drawing process performed after the combination process is performed so that the cross-sectional reduction rate is 1% or more and 20% or less until the diameter of the wire becomes a dimension wire diameter of 75% or less of the metal strip thickness dimension. Thereby, a round cross-section wire with excellent surface quality free from wrinkles can be obtained.

  The reason for setting as described above is as follows. In the slitting process, uneven portions are formed on the shear surface. Also, in drawing wire drawing, the flat portion of the wire is compressed inward, so this part is in a concave state, and there is a part where the dimension is reduced from the initial plate thickness dimension To do. Furthermore, when the flat part of the wire is compressed inward, the surface becomes a bowl-like shape, and unevenness due to this is also generated. Therefore, in order to obtain a wire having a good surface, it is necessary to remove these irregularities. However, the combination processing step is performed in which the diameter of the wire is 80% or more of the thickness dimension of the metal strip before slitting 95. These irregularities can be removed by carrying out until the circular diameter dimension is less than or equal to%. When each unevenness is severe, it is preferable to make it closer to 80%.

  Further, by performing the subsequent drawing and drawing until the wire diameter reaches a dimension wire diameter of 75% or less of the metal strip thickness dimension, the stripped wire traces and the polishing in the longitudinal direction of the wire material generated in the preceding stage are performed. It is possible to level the polishing marks by processing and finish the surface smoothly. If these linear traces are deep, it is preferable to carry out until the value becomes smaller.

FIG. 10 shows details of wire drawing for each pass and continuous wire drawing.
FIG. 10 (a) is a process diagram of wire drawing for each pass. The drawing die 21, the peeling die 23, and the polishing cloth 22 are arranged in a straight line so that the drawing wire drawing, the peeling processing, and the polishing processing are performed. The combination processing step consisting of: is repeated continuously in the longitudinal direction of the wire. The reduction rate of the cross-sectional area of the wire per pass is 1% to 20%.

  FIG. 10B is a process drawing of continuous wire drawing, where a plurality of drawing dies 21, peeling dies 23, and polishing cloths 22 are arranged, and a combination of drawing wire drawing, skinning and polishing. The processing step is repeated continuously in the longitudinal direction of the wire.

Based on FIG. 11 and FIG. 12, the longest diagonal of the wire cross section will be described.
FIG. 11 shows the longest diagonal line of the wire cross section when the cross section is octagonal, and shows 90% of the area of the circle whose diameter is the distance of the longest diagonal line. FIG. 11A shows a case where the wire cross section is close to a regular octagon, and FIG. 11B shows a case where the wire cross section is a flat octagon.

  FIG. 12 shows the longest diagonal line of the wire cross section when the cross section is a quadrangle, and shows a circle of 70% of the area of the circle whose diameter is the distance of the longest diagonal line. FIG. 12A shows a case where the cross section of the wire is close to a square, and FIG. 11B shows a case where the cross section of the wire is rectangular.

  FIG. 13 shows the transition of the entrainment layer 26 due to drawing wire drawing and polishing. The octagonal cross-section wire 3 becomes a wire 24 in which the corners of the octagon are crushed by drawing and the winding layer 26 is present at intervals in the outer periphery. When this wire 24 is polished by using the polishing cloth 22, the entrainment layer 26 protruding at the outer peripheral portion is scraped. Thereafter, when the wire 24 is drawn by drawing and drawing, the entrainment layer 26 becomes thinner. By repeating this, the entrainment layer 26 disappears, and a final finished wire having a good surface free from entrainment scratches is obtained. In FIG. 13, the peeling process is omitted.

  As described above, the wire rod having a polygonal cross section having eight or more corners obtained by the slitting process in the present invention has a larger corner angle than the quadrangular cross section wire, and hence is drawn and drawn. The occurrence of wrinkles due to the collapse of the corners due to the corners and the winding is overwhelmingly small, and the degree of the winding is also small. For this reason, the entrainment layer can be easily removed by the combined processing step of drawing and stripping + peeling + polishing performed after the slitting step.

  Moreover, since the diagonal distance obtained by the slitting process has a polygonal cross section with 8 or more corners, the diagonal distance is shorter than that of the quadrangular cross section wire, drawing wire drawing can be started from a thin wire diameter. This reduces the number of processes and improves the processing efficiency. Furthermore, the outer layer in the same concentric direction can be uniformly removed by performing the combined processing step of drawing wire drawing + peeling + polishing in the same row, and the processing efficiency is high.

  Further, in the case of a wire having a hexagonal cross section, the occurrence frequency of wrinkles due to collapse or winding is lower than that of a wire having a quadrangular cross section. However, in the slitting process, the V-shaped roll 11 pushes out, and a situation occurs in which the pressure is divided into several degrees. When pressed in several times, it may be misaligned depending on the adjustment. When misalignment occurs, the cross-sectional shape of the wire becomes not a hexagon but a distorted shape. From such circumstances, in the case of a wire having a hexagonal cross section, there is a problem in processing.

Specific examples are shown below.
The following two samples were produced in the slitting process of an austenitic stainless steel strip having a thickness of 1.5 mm and a width of 30 mm.
1: Distance between sides 1.5 mm x 1.5 mm square section 2: Distance between sides 1.5 mm x 1.5 mm octagon section

For each of these two samples,
A Drawing and drawing only (Drawing every -10% in the circular area of the longest diagonal diameter)
B Inventive technology With a circular area of the longest diagonal diameter, every -10% wire drawing + peeling (drawing wire diameter -0.01 mm) + polishing (initial roughness # 100, final roughness # 400) After processing to a diameter dimension circle that is in the range of 80% to 95% of the thickness of the strip with the combination of the above, processing to a diameter φ 1.000 mm that becomes a 67% diameter dimension circle of the thickness of the strip by drawing wire drawing The surface flaw residual frequency was confirmed about four cases which performed processing A and B with respect to sample 1 and 2. The results are shown in Table 1.

The contents of the notes in the table are as follows.
* 1: Drawing wire drawing condition = Area reduction rate with the longest diagonal line per pass as diameter or area reduction rate from circle after peeling * 2: Peeling drawing condition = circle used for drawing wire drawing Diameter reduction value of peeled die relative to die diameter * 3: Polishing condition = roughness count of polishing cloth of polishing wheel. In the second half, counting from the completed wire diameter, it goes back to the second pass.
* 4: Surface flaw frequency = observation field of view / counts wrinkles with a size of 30 μm or more at 10 cm

  Based on the above results, the slitting process forms a polygonal cross-section wire having 8 or more corners, and the wire is subjected to the combined drawing / drawing + peeling + polishing process of the present invention. The effect of this has been demonstrated.

Below, the application example to each technical field of the metal round cross-section wire manufactured by the manufacturing method of the metal round cross-section wire of this invention is demonstrated.
First, the nickel-free austenitic stainless steel round cross-section wire of the present invention is produced by the method for producing a metal round cross-section wire of the present invention, C: 0.06 mass% or less, Ni: 0.6 mass% or less, Cr : 20.0-25.0 mass%, Mo: 1.0-1.5 mass%, N: 0.02 mass% or less, Ti: 0.05-0.5 mass%, Nb: 0.1 It is obtained by applying solid-phase nitrogen absorption treatment using a ferritic stainless steel sheet strip material of 0.6% by mass, the balance being Fe and inevitable impurities.

  This nickel-free austenite wire is produced by the method for producing a metal round cross-section wire according to the present invention, and therefore has no surface scratches and excellent dimensional accuracy, so that it is particularly useful as a material for accessories and medical devices. is there.

  Secondly, the round cross-section wire for welding wire, resistance, and heating wire of the present invention is produced by the method for producing a metal round cross-section wire of the present invention, and C: 0.06% by mass or less, Si: 1.0 % By mass, Mn: 1.0% by mass or less, P: 0.050% by mass or less, S: 0.03% by mass or less, Ni: 2.0% by mass or less, Cr: 16-20% by mass, Al: 1 to 6% by mass, Ti: 0.5% by mass or less, N: 0.06% by mass or less, the balance being made of Fe and inevitable impurities, and a ferritic stainless steel steel strip containing a rare earth element as necessary It is obtained as a material.

  The round cross-section wire for welding wire, resistance, and heating wire is produced by the method for producing a metal round cross-section wire of the present invention, so there is no surface flaw, and the defective portion causes an increase in electrical resistance. This will not cause a short circuit. Therefore, it can be effectively used as a member such as a heating wire or a resistance wire. Moreover, it can be effectively used as a welding wire for fastening a high temperature oxidation resistant ferritic stainless steel plate used in a reformer for a fuel cell.

  Thirdly, the round cross-section wire for resistance and heating wire of the present invention is manufactured by the method for manufacturing a metal round cross-section wire of the present invention, C: 0.08% by mass or less, Si: 2.0 to 5.0 Mass%, Mn: 1.0 mass% or less, Cu: 2.0 mass% or less, P: 0.050 mass% or less, S: 0.03 mass% or less, Ni: 10.0-15.0 mass% Cr: 15.0 to 22.0% by mass, Nb: 0.05 to 0.25% by mass, N: 0.06% by mass or less, and an austenitic stainless steel strip made of Fe and inevitable impurities. It is obtained as a material.

  This round wire for resistance and heating wire is manufactured by the method for producing a metal round cross-section wire of the present invention, so there is no surface scratch, a defective portion causes an increase in electrical resistance, short-circuits, etc. It will not cause Therefore, it can be effectively used as a member such as a heating wire or a resistance wire.

  The present invention eliminates surface scratches by eliminating collapsed entrainment scratches generated on the surface of the wire by using a processing technique for forming a square cross-section material obtained by cutting a thin plate into a predetermined width into a round thin wire. It can be used as a method for producing a metal round cross-section wire capable of producing a wire with excellent dimensional accuracy. By using this technology, it is possible to obtain a metal round cross-section wire that is not distributed in the general market, and in particular, it is applied to nickel-free austenite wire and welding wire having the same composition as the steel plate coil used in the structure. Is possible.

DESCRIPTION OF SYMBOLS 1 Material plate coil 2 Slitting apparatus 3 Octagonal cross-section wire 4 Material plate coil remainder 5 V-groove processing step 6 First shear processing step 7 Second shear processing step 8 Roll flat roll separation processing step 11 V-shaped rolls 12, 12a, 12b, 12c V-shaped blade 13 Shear roll 14 14a, 14b Shear blade 15 Octagonal cross-section wire 15a Polygon cross-section wire 16, 16a, 16b Holding part 17 Upper V-shaped groove 17a, 17b Inclined surface 18 Lower V-shaped groove 18a, 18b Inclined surface 19 Rolled flat roll 20 Crack 21 Drawing die 22 Abrasive cloth ring 23 Peeling die 24 Wire rod 24a Wire rod 24b before wire drawing 24b Wire rod after drawing 24c Wire rod before stripping 24d Wire rod after stripping 25 Capstan roll 26 Entrainment layer

Claims (10)

A slitting process for continuously slitting a rolled metal strip in the longitudinal direction, and a drawing and drawing process for a wire having a polygonal cross section with 8 or more corners obtained by the slitting process; A combination processing step comprising a peeling process for removing a corner layer that has been crushed and drawn by the drawing and drawing process, and a polishing process for polishing the outer peripheral surface of the wire cross section. A method of manufacturing a metal round cross-section wire by continuously repeating the process in the longitudinal direction of the wire, and subsequently processing by drawing and drawing until the diameter of the wire reaches a predetermined diameter , wherein the slitting step Using a pair of front and back V-shaped rolls or rolls with R, a groove processing step for forming grooves symmetrically on the front and back sides, and a shear roll having an angle or R on the blade side and the restraining side By shearing from the table side groove vertices without breaking the inclination angle of the groove to the back side groove vertex, metal round cross-section wire number of angles is characterized by comprising a shearing step of forming the octagonal or polygonal cross-section wire Manufacturing method. A slitting process for continuously slitting a rolled metal strip in the longitudinal direction, and a drawing and drawing process for a wire having a polygonal cross section with 8 or more corners obtained by the slitting process; A combination processing step comprising a peeling process for removing a corner layer that has been crushed and drawn by the drawing and drawing process, and a polishing process for polishing the outer peripheral surface of the wire cross section. A method of manufacturing a metal round cross-section wire by continuously repeating the process in the longitudinal direction of the wire, and subsequently processing by drawing and drawing until the diameter of the wire reaches a predetermined diameter , wherein the slitting step Using a pair of front and back V-shaped rolls or rolls with R, a groove processing step for forming grooves symmetrically on the front and back sides, and a shear roll having an angle or R on the blade side and the restraining side A first shearing step in which cutting is made halfway from the top groove top to the back groove top without breaking the inclination angle of the groove, and the V-shaped roll or the R-attached roll is pressed from the reverse direction to half of the line cross section. A method for producing a metal round cross-section wire comprising a two-shear processing step and a rolling flat roll separation processing step of forming a polygonal cross-section wire having 8 or more corners by rolling with a flat roll. . The above combination process is continuously performed on the same line until the diameter of the wire becomes a circular diameter of 80% or more and 95% or less of the thickness of the metal strip before slitting, and drawing and drawing. The cross-sectional reduction rate is 1% or more and 20% or less, and the amount of peeling in the peeling process is such that the diameter of the wire after the peeling process is 0.001 mm or more and 0.1 mm than the diameter of the wire before the peeling process. The drawing wire drawing performed after the combination processing step is performed in a cross section until the diameter of the wire becomes a dimension wire diameter of 75% or less of the metal strip thickness dimension. The method for producing a metal round cross-section wire according to claim 1 or 2, wherein the reduction rate is 1% or more and 20% or less. 4. The polishing process according to claim 1, wherein the polishing process is performed by arranging at least up, down, left, and right polishing cloths having a surface roughness of 20 to 1000 on the surface of the wire to be polished. 5 . The manufacturing method of the metal round cross-section wire in any one. The tip angle of the V-shaped roll or the roll with R is 30 ° or more and 120 ° or less, the blade angle of the shear roll is 15 ° or more and 60 ° or less, and the suppression angle of the shear roll is 15 ° or more and 60 °. The method for producing a metal round cross-section wire according to any one of claims 1 to 4 , wherein the metal round cross-section wire is at most °. A plurality of sets of the V-shaped roll or the R-attached roll and the shearing roll are installed in parallel, and it is possible to form a polygonal cross-section wire having several strips at a time and having eight or more corners at a time. The manufacturing method of the metal round cross-section wire in any one of 1-5 . The process according to claim 1 to be produced by the method for producing metal round cross-section wire according to any one of 6, the metal round cross-section wire, wherein the entrainment flaws no. It manufactures with the manufacturing method of the metal round cross-section wire of any one of Claim 1 to 6 , C: 0.06 mass% or less, Ni: 0.6 mass% or less, Cr: 20.0-25. 0% by mass, Mo: 1.0 to 1.5% by mass, N: 0.02% by mass or less, Ti: 0.05 to 0.5% by mass, Nb: 0.1 to 0.6% by mass, balance A method for producing a nickel-free austenitic stainless steel round-section wire, characterized by being obtained by subjecting a ferritic stainless steel sheet strip made of Fe and inevitable impurities to solid phase nitrogen absorption treatment. It manufactures with the manufacturing method of the metal round cross-section wire of any one of Claim 1 to 6 , C: 0.06 mass% or less, Si: 1.0 mass% or less, Mn: 1.0 mass% or less , P: 0.050 mass% or less, S: 0.03 mass% or less, Ni: 2.0 mass% or less, Cr: 16-20 mass%, Al: 1-6 mass%, Ti: 0.5 mass % Or less, N: 0.06% by mass or less, the balance being Fe and inevitable impurities, and if necessary, obtaining a ferritic stainless steel sheet strip containing rare earth elements as a material Manufacturing method of round cross-section wire for resistance and heating wire. It manufactures with the manufacturing method of the metal round cross-section wire of any one of Claim 1 to 6 , C: 0.08 mass% or less, Si: 2.0-5.0 mass%, Mn: 1.0 % By mass or less, Cu: 2.0% by mass or less, P: 0.050% by mass or less, S: 0.03% by mass or less, Ni: 10.0-15.0% by mass, Cr: 15.0-22 0.0% by mass, Nb: 0.05 to 0.25% by mass, N: 0.06% by mass or less, and an austenitic stainless steel strip made of Fe and inevitable impurities is obtained as a raw material. Manufacturing method of round cross-section wire for resistance and heating wire.

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