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EP3016754B2 - Procédé pour laminer à chaud des feuillards d'acier - Google Patents
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EP3016754B2 - Procédé pour laminer à chaud des feuillards d'acier - Google Patents

Procédé pour laminer à chaud des feuillards d'acier Download PDF

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Publication number
EP3016754B2
EP3016754B2 EP14736716.3A EP14736716A EP3016754B2 EP 3016754 B2 EP3016754 B2 EP 3016754B2 EP 14736716 A EP14736716 A EP 14736716A EP 3016754 B2 EP3016754 B2 EP 3016754B2
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EP
European Patent Office
Prior art keywords
rolling
cooling
hot
steel strip
stand
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EP14736716.3A
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German (de)
English (en)
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EP3016754A1 (fr
EP3016754B1 (fr
Inventor
Heribert FISCHER
Caspar Schmitt
Andreas Zaum
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Priority to PL14736716T priority Critical patent/PL3016754T3/pl
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0231—Warm rolling

Definitions

  • the invention relates to a method for hot rolling steel strip, see e.g. EP 1 038 9178 A1
  • a hot rolling mill of the type in question here usually comprises a hot rolling mill with several rolling stands which are passed through one after the other in the conveying direction of the steel strip to be hot rolled and a cooling section for the intensive cooling of the hot-rolled steel strip emerging from the last rolling stand of the rolling mill.
  • Methods of the type according to the invention are used for rolling so-called "heavy plate” whose thickness is at least 15 mm.
  • the respective steel strip is thermomechanically rolled in a four-high stand.
  • this rolling process takes much longer than hot rolling in a hot strip mill.
  • the aim is therefore to also hot roll thick steel strips in a conventional hot rolling mill.
  • a particular challenge is the rolling of flat steel material intended for the manufacture of thick-walled pipelines, which have to meet the highest requirements in terms of toughness and resistance to cracking. These properties are usually assessed using the results of the so-called “Drop Weight Tear Test", or "DWTT” for short.
  • the DWTT is described in the API 5L3 standard of the American Petroleum Institute, 3rd Edition, 02/1996, in ASTM E436, in DIN EN 10274 from 1999 and in the steel-iron test sheet SEP 1326.
  • a test specimen of a defined weight is dropped from a similarly defined height onto a strip-shaped sheet metal sample, which has a defined groove-like notch on the side facing away from the impacting test specimen in the area of the expected fracture and is placed with its end sections on a support.
  • a certain specified temperature for example -35 °C, the ductile fracture fraction of the respective sample generated in this way is on average 85 %.
  • the preliminary strip is then continuously hot rolled to form a hot strip in one or more passes.
  • Hot rolling is carried out in a temperature range that includes the recrystallization range of the austenite.
  • the hot strip is then cooled by means of a cooling device to a temperature that is at least 20 °C below the recrystallization stop temperature, with the cooling rate being at least 10 °C/s.
  • Rolling is then continued below the recrystallization stop temperature with a total deformation degree of at least 30% in the temperature range below the recrystallization stop temperature until the finished hot strip exits the hot rolling mill.
  • steels for the manufacture of thick-walled pipes typically consist of an alloy containing, in addition to iron and unavoidable impurities (in % by weight), C: ⁇ 0.18%, Si: ⁇ 1.5%, Mn: ⁇ 2.5%, P: 0.005 - 0.1%, S: ⁇ 0.03%, N: ⁇ 0.02%, Cr: ⁇ 0.5%, Cu: ⁇ 0.5%, Ni: ⁇ 0.5%, Mo: ⁇ 0.5%, Al ⁇ 2%, up to a total of 0.3% of one or more of the elements B, Nb, Ti, V, Zr and Ca.
  • These steels also include the steel grades known as "X70" and X80.
  • the object of the invention was to create a hot rolling process based on a conventional hot rolling mill with which hot strips with a final thickness of more than 15 mm can be reliably produced, which also meet the highest requirements for their toughness.
  • a plant for hot rolling steel strip therefore comprises, in accordance with the state of the art specified at the beginning, a hot rolling mill which has several rolling stands which are passed through one after the other in the conveying direction of the steel strip to be hot rolled.
  • a hot rolling mill consists of seven rolling stands which are lined up one after the other in the conveying direction and which are passed through one after the other by the steel strip to be hot rolled.
  • the plant also has a cooling section for intensive cooling of the hot-rolled steel strip emerging from the last rolling stand of the rolling mill.
  • the cooling section now begins, in the direction of conveyance of the steel strip to be hot rolled, not behind the last rolling stand of the hot rolling stage, but before the end of the hot rolling stage.
  • the start of the cooling section is set up in such a way that the cooling section begins immediately after the last rolling stand that was actively passed through before entering the cooling section.
  • Active here means that hot rolling is still taking place in this rolling stand.
  • Inactive on the other hand, are the rolling stands whose roll gap is opened so wide by a corresponding adjustment of the work rolls that the hot strip no longer experiences any deformation when passing through the relevant rolling stand. This means that when the hot strip leaves the last hot rolling stand in the direction of conveyance before the start of the cooling section, in which hot rolling is still taking place, it is immediately caught by the cooling fluid released by the cooling section and cooled at an accelerated rate.
  • the cooling section and the hot rolling stage overlap in such a way that the rolling stage is shortened by two rolling stands and the cooling section is extended into the rolling stage at least so far that, if several of the rolling stands passed through last in the conveying direction of the steel strip to be hot rolled are inactivated, cooling can take place directly behind the last rolling stand in which forming is still taking place.
  • the method according to the invention according to claim 1 for producing rolled steel strip accordingly provides that it is carried out on a previously described system and, during hot rolling, the roll gap is opened in inactive rolling stands to such an extent that no more deformation of the steel strip takes place in this rolling stand in the hot rolling stage, wherein the steel strip is cooled at an accelerated rate after leaving the last active rolling stand by applying a cooling fluid.
  • the invention is therefore based on the proposal to operate a conventional multi-stand rolling mill in such a way that the thickness of the steel strip is not reduced in each of the hot rolling stands it passes through. Instead, the steel strip is only deformed in the active rolling stands of the rolling mill. In the inactive rolling stands, the roll gap is opened so wide that its work rolls no longer touch the rolling stock, so that no more deformation can take place in it. At the same time, the start of the cooling section is shifted into the hot rolling mill so that, for example, in a hot rolling mill with seven hot rolling stands, the accelerated cooling can take place immediately after the fifth rolling stand and no more hot rolling takes place above the penultimate, i.e. the sixth, and last, i.e. the seventh, rolling stands.
  • steel sheets for pipes can be produced which not only have a high level of strength, such as the steel grades "X70” or "X80", but also have a low transition temperature of -10° C and less and high toughness requirements up to thicknesses of 25.4 mm.
  • bainitic steels can preferably be used in order to reliably meet the requirements to be met according to DWTT.
  • the application range of ferritic / pearlitic steels can be expanded to include greater thicknesses.
  • the cooling according to the invention which extends into the rolling line and starts early when rolling in thicknesses >15 mm, prevents unhindered access of oxygen and, as a result, severe post-scaling of the strip surfaces.
  • the rolling speeds are low due to the early end of active forming and the low overall degrees of deformation achieved during hot rolling. They are typically in the range of less than 3 m/s.
  • cooling section By extending the cooling section into the finishing line, it is also possible to display cooling curves with holding times.
  • the system configuration simply has to be designed in such a way that when rolling in a rolling line with seven rolling stands, of which only the first five are activated, the spraying starts directly behind the fifth stand, whereby the amount of cooling fluid applied in front of and behind the unused rolling stands can ideally be adjusted.
  • another spraying system behind the seventh stand and/or a suitable cooling section behind the measuring house provided as standard in hot rolling mills of the type in question different holding times can be achieved with the desired cooling curves.
  • the cooling section can comprise several cooling units and a cooling unit can be arranged above the rolling stand passed through in the conveying direction behind the last one before entering the cooling section and each further rolling stand passed through thereafter.
  • the cooling that takes place after the last active rolling stand is not carried out using conventional laminar cooling, which is known from conventional hot rolling mills, but rather a particularly rapid cooling with a higher cooling rate of at least 80 K/s is used. Cooling rates of at least 130 K/s have proven particularly effective, although in practice the cooling rate is typically up to 160 K/s.
  • the rapid cooling provided for in the invention limits grain growth in the hot-rolled steel strip and increases the cold toughness of the material, so that it reliably reaches maximum toughness values at low temperatures and accordingly has the highest mechanical properties.
  • intensive cooling or compact cooling units can be used, for example. These should be designed in such a way that the cooling section is able to provide a cooling fluid output of at least 1000 m 3 /h, in particular up to 1500 m 3 /h. Cooling is preferably carried out from both the top and bottom of the strip to be cooled in order to ensure that the strip cross-section cools as quickly as possible and as evenly as possible. After each intensive cooling, the water remaining on the hot strip can be sprayed off by cross-spraying at high pressure before the hot strip passes through the next inactive rolling stand and is subsequently cooled further. This prevents water from standing on the hot strip after the respective cooling stage and ensures that a correspondingly controlled, gradual cooling of the hot strip is achieved.
  • Compact cooling units are particularly suitable for the accelerated cooling that is brought forward into the rolling mill according to the invention, and each of these units applies a cooling fluid jet concentrated on a specific section to the respective hot strip.
  • the cooling units of the cooling section can be designed as conventional intensive cooling units, for example.
  • the length measured in the conveying direction of the steel strip to be hot-rolled, over which the cooling unit arranged behind one of the rolling stands within the rolling mill applies cooling fluid to the steel strip in the conveying direction is at most 25% of the distance at which the rolling stands of the rolling mill arranged adjacent to one another are arranged one after the other in the conveying direction.
  • the length section over which the cooling fluid is applied is limited to 8 - 15% of the distance between the cooling units, the best working results are achieved in practice.
  • cooling between the rolling stands can be carried out in such a way that, due to the intensity of the cooling, no longer controlled deformation can take place in the austenite region of the steel being processed.
  • the cooling units provided according to the invention which are designed in particular as compact cooling units, differ from those cooling devices that are used in conventional hot rolling mills to cool the strip to be hot rolled between two rolling stands.
  • the cooling units used according to the invention from the last active rolling stand onwards cause such intensive strip cooling that no longer controlled deformation can take place in the austenite region.
  • the initial hot rolling temperature of the steel strip is above 800 °C and below 1050 °C.
  • the exit temperature at which the steel strip enters the cooling section when leaving the last rolling stand over which it is hot-formed is typically between 740 °C and 900 °C.
  • the steel strip hot-rolled according to the invention it may be expedient to interrupt the cooling of the steel strip at a cooling stop temperature when the steel strip has reached a cooling stop temperature of between 500 °C and 700 °C. It has also proven advantageous with regard to the development of the desired mechanical properties if the steel strip is cooled in air for 2 - 12 seconds without active cooling after reaching this cooling stop temperature.
  • the steel strip After cooling as described above, the steel strip can be coiled at a coiling temperature of between 450 °C and 650 °C.
  • Thin slabs or pre-strips with a thickness of 50 - 100 mm are particularly suitable as preliminary products for the hot rolling according to the invention.
  • the final thickness of the steel strip hot-rolled according to the invention is typically more than 15 mm.
  • Tests have shown that with the method according to the invention, heavy plates can be hot-rolled on hot rolling mills converted according to the invention in a continuous sequence of work steps. These plates are up to 25.4 mm thick and in the DWTT also meet the highest requirements for their toughness.
  • the method according to the invention is suitable for high-strength, micro-alloyed steels and steels according to DIN EN 10149.
  • the method according to the invention is particularly suitable for processing steel strips made of the bainitic grades X60, X65, X70, X80 and other comparable steels that are usually used for heavy plate production.
  • the steels particularly suitable for the process according to the invention can be summarized under the general alloying specification (in wt.
  • the invention provides a method which makes it possible in a variety of ways to produce hot-rolled steel strip of great thickness based on a conventional hot rolling mill, which not only has high strength values but also has optimal toughness.
  • the steel strips produced in this way are particularly suitable for pipeline construction due to their property profile.
  • a hot rolling mill designed as described above can also be used for other hot rolling tasks without any problem.
  • the cooling units provided according to the invention in the overlap area between the cooling section and the hot rolling stage only have to be deactivated or operated in such a way that they meet the cooling requirements for conventional hot rolling.
  • the plant 1 comprises a hot rolling mill 2, which is formed in a conventional manner by seven rolling stands F1, F2, F3, F4, F5, F6, F7, which are arranged one after the other in the conveying direction F of the steel strip S to be hot rolled in the plant 1, a roller table 3, which follows the hot rolling mill 2 in the conveying direction F, a coiler device 4, which is positioned at the end of the roller table 3, seen in the conveying direction F, a measuring house M, which is arranged in the area of the roller table 3 adjacent to the end of the hot rolling mill 2, and a cooling section 5.
  • a hot rolling mill 2 which is formed in a conventional manner by seven rolling stands F1, F2, F3, F4, F5, F6, F7, which are arranged one after the other in the conveying direction F of the steel strip S to be hot rolled in the plant 1
  • a roller table 3 which follows the hot rolling mill 2 in the conveying direction F
  • a coiler device 4 which is positioned at the end of the roller table 3, seen in the conveying direction F
  • the cooling section 5 is formed by several cooling units K1, K2, K3, designed as compact cooling devices, arranged one behind the other in the conveying direction F, and cooling units K4, K5, K6, ..., Kn, designed as conventional cooling units, optionally as laminar cooling units, which are fed via a cooling fluid supply (not shown here) and whose cooling fluid output can be individually adjusted.
  • the cooling fluid is applied by the respective cooling units K1 - Kn from below and from above to the respective bottom and top of the steel strip S.
  • the cooling fluid flowing to the cooling units K1 - K3 can, for example, be pressurized if necessary by means of pumps (also not shown here).
  • the first cooling unit K1 of the cooling section 5 in the conveying direction F is arranged between the fifth rolling stand F5 and the sixth rolling stand F6 and the second cooling unit K2 of the cooling section 5 is arranged between the sixth rolling stand F6 and the seventh rolling stand F7 of the rolling mill 2, so that the cooling section 5 extends into the rolling mill 2 and accordingly the end section 6 of the rolling mill 2 and the beginning section 7 of the cooling section 5 overlap each other.
  • the length section a, over which the cooling units K1, K2 and K3 arranged in the rolling mill apply cooling fluid to the steel strip S, is limited to approx. 10% of the distance A in which, as can be seen from the rolling stands F5 and F6 arranged one behind the other in the conveying direction F in the Figures 2 and 3 shown, the adjacent rolling stands F1 - F7 are arranged respectively.
  • a spraying device Q1, Q2, Q3 is provided which directs a high-pressure jet O aligned transversely to the conveying direction F and in the direction of the respective cooling unit K1, K2, K3 at least onto the upper side of the steel strip S in order to drive cooling fluid standing there from the relevant surface.
  • the cooling unit K1 arranged between the fifth rolling stand F5 and the sixth rolling stand F6 of the hot rolling mill 2 is set up in such a way that, when the cooling unit K1 is switched on, the coolant jets directed vertically downwards that it emits reach as far as the outlet from the rolling stand F5.
  • the cooling unit K2 arranged between the sixth rolling stand F6 and the seventh rolling stand F7 of the hot rolling mill 2 is set up in such a way that, when the cooling unit K2 is switched on, the coolant jets that it emits reach as far as the outlet from the rolling stand F6.
  • the cooling unit K3 arranged behind the seventh rolling stand F7 in the conveying direction F is set up in such a way that, when the cooling unit K3 is switched on, the coolant jets that it emits reach as far as the rolling stand F7.
  • At least one of the cooling units K1 - K3 is in operation. Cooling in air can take place in the area of the cooling unit that is not active.
  • the hot strip is cooled to the required coiling temperature HT using the conventional cooling units K4 - Kn, which are located behind the hot rolling mill 2 in the conveying direction F.
  • the thickness of the steel slabs processed in rolling mill 2 is typically in the range of 180 - 270 mm.
  • 255 mm thick slabs were produced from the steels E1, E2, E3 specified in Table 1, which entered hot rolling mill 2 with a hot rolling start temperature WAT typically in the range of 800 - 1050 °C and were hot rolled there in a continuous sequence in the first five rolling stands F1, F2, F3, F4, F5 to form a steel strip S.
  • the thickness D of the steel strips S hot-rolled from the steels E1, E2, E3 was 23 mm or 18 mm in each case.
  • the hot rolling start temperatures WAT specifically set in the exemplary embodiments explained here are given in Table 3.
  • the temperature TAF5 at the exit of the fifth rolling stand F5 the temperature WET at the exit of the finishing train and the coiler temperature HT are also specified there for the hot strip processed in each case and produced from the respective steel E1, E2 and E3.
  • the steel strips S emerging from the fifth rolling stand F5 have also passed through the last two rolling stands F6 and F7 of the hot rolling mill 2.
  • these rolling stands F6, F7 the work rolls were moved so far apart that the height of the roll gap delimited by them was greater than the thickness D of the steel strip S emerging from the fifth rolling stand F5.
  • no further forming of the steel strip S took place via the last two rolling stands F6 and F7 of the rolling mill 2 as seen in the conveying direction F.
  • the rolling stand F5 was the last of the rolling stands F1 - F7 in the conveying direction F in which hot forming of the steel strip S took place
  • the cooling units K1 and K2 as well as all subsequent cooling units K3 - Kn of the cooling section 5 were activated. Accordingly, the steel strip S emerging from the last active rolling stand F5 in the conveying direction F was caught by the cooling fluid jet of the cooling unit K1 after it emerged from the working gap A5 and was intensively cooled on its way to the next rolling stand F6 until it reached the inlet E6 of the rolling stand F6.
  • the active cooling is stopped and the steel strip S runs out on the roller table 3 until it is reeled into a coil in the reeling device 4 at a reel temperature of 450 - 650 °C.
  • the cooling units K1 - Kn of the cooling section 5 have achieved a total output of up to 1500 m3/h, specifically 1400 m3 /h, of cooling fluid via the cooling section 5 at a cooling fluid pressure of more than 3 bar, specifically 3.2 bar, and a cooling fluid temperature of less than 40 °C, specifically 25 °C.
  • water was used as the cooling fluid.
  • other cooling fluids can also be used to achieve the required cooling rate.
  • Fig.4 The dashed line T2 shows the temperature profile that is achieved during the production of a 23 mm thick hot strip sample made of steel E1 when the cooling already begins in the rolling mill 2 in accordance with the invention, but the cooling rate is less than 80 K/s.
  • the dotted line T4 also shows the temperature curve achieved in a conventional hot rolling mill equipped with seven rolling stands, in which the hot strip is cooled in air after leaving the last active rolling stand F5 up to the measuring house M and after the measuring house M by means of conventional laminar cooling.
  • Each of the steel strips S manufactured in this way from steels E1, E2 and E3 achieved the target values specified for the respective steel in terms of strength (steel E1: Rm at least 570 MPa, Rt0.5 at least 485 MPa; steel E2: Rm at least 570 MPa, Rt0.5 at least 485 MPa; steel E3: Rm at least 625 MPa, Rt0.5 at least 555 MPa).

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  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
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  • General Engineering & Computer Science (AREA)
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Claims (9)

  1. Procédé de laminage à chaud d'un feuillard d'acier destiné à la fabrication de tubes à paroi épaisse, caractérisé en ce qu'on le met en oeuvre sur une installation de laminage à chaud des feuillards d'acier (S), avec un train de laminage à chaud (2) qui se compose de sept cages de laminage (F1 - F7) qui se succèdent dans la direction de transport (F) du feuillard d'acier (S) à laminer à chaud, et avec un parcours de refroidissement (5) pour le refroidissement intensif du feuillard d'acier laminée à chaud (S) sortant de la dernière cage de laminage (F7) du train de laminage (2), dans lequel le début du parcours de refroidissement (5), vu dans le sens de transport (F) du feuillard d'acier à laminer à chaud (S), se situe avant la fin du train de laminage à chaud (2), la section de refroidissement (5) commençant directement à la suite de la dernière cage de laminoir (F5) traversée activement avant l'entrée dans la section de refroidissement (5), dans laquelle a lieu un laminage à chaud de la feuillard d'acier (S) respective à laminer à chaud, et en ce que la section de refroidissement (5) comprend plusieurs groupes de refroidissement (K1 - Kn) et en ce que, dans le sens de transport (F), un groupe de refroidissement (K1, K2 - Kn) est placé derrière la dernière cage de laminage (F5) traversée avant l'entrée dans la section de refroidissement (5) et derrière chaque autre cage de laminage (F6, F7) traversée à la suite et que le premier groupe de refroidissement (K1) de la section de refroidissement (5) dans le sens de transport F est disposé entre la cinquième cage de laminage (F5) et la sixième cage de laminage (F6) et que le deuxième groupe de refroidissement (K2) de la section de refroidissement (5) est disposé entre la sixième cage de laminage (F6) et la septième cage de laminage (F7) du train de laminage (2), et en ce que, pendant le laminage à chaud, l'écartement de travail (A6, A7) des deux dernières cages de laminage (F6, F7), vu dans le sens de transport (F), est réduit autant que possible, que, à partir de cette cage de laminage (A6, A7), il n'y a plus de déformation du feuillard d'acier (S) dans le train de laminage à chaud (2), cinq des cages de laminage (F1 - F5) étant actives, et en ce que le feuillard d'acier (S) est soumise, à la suite de la sortie de la cage de laminage ouverte avant la première cage de laminage respective (F6,F7) est refroidi de manière accélérée en l'exposant à un fluide de refroidissement avec une vitesse de refroidissement d'au moins 80 Kls, l'épaisseur finale (D) du feuillard d'acier (S) à la sortie du train de laminage à chaud (2) vaut au moins 15 mm.
  2. Procédé selon la revendication 1,
    caractérisé en ce que la vitesse finale de laminage à chaud vaut à 3 m/s.
  3. Procédé selon l'une des revendications 1 ou 2,
    caractérisé en ce que la température initiale de laminage à chaud du feuillard d'acier (S) vaut plus de 800 °C et inférieure à 1050 °C.
  4. Procédé selon l'une des revendications 1 à 5,
    caractérisé en ce que la température de sortie à laquelle le feuillard d'acier (S) entre dans la section de refroidissement (5) lorsqu'il quitte la dernière cage de laminoir (F5) par laquelle il est déformé à chaud, se situe entre 740 °C et 900 °C.
  5. Procédé selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que l'on interrompt le refroidissement du feuillard d'acier (S) à une température d'arrêt de refroidissement, qui se situe entre 500 °C et 700 °C.
  6. Procédé selon la revendication 5,
    caractérisé en ce que l'on maintient le feuillard d'acier (2) pendant 2 à 12 secondes à la température respective lorsque l'on atteint la température d'arrêt de refroidissement
  7. Procédé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que l'on bobine le feuillard d'acier (S) à une température de bobinage, qui se situe entre 450 °C et 650 °C.
  8. Procédé selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce que l'épaisseur (D) du feuillard d'acier (S) à son entrée dans le train de laminage à chaud vaut 50 - 100 mm et elle vaut >15 - 25,5 mm lorsqu'il quitte le train de laminage à chaud.
  9. Procédé selon l'une quelconque des revendications 1 à 8,
    d'après lequel cette feuillard d'acier (S) est fabriquée à partir d'un acier qui, outre le fer et les impuretés inévitables, est constitué de (en % en poids) C : < 0,18 %, Si : < 1,5 %, Mn : 2,5 %, P : 0,005 - 0,1 %, S : 0,03 %, N : < 0,02 %, Cr: 0,5 %, Cu: 0,5 %, Ni: 0,5 %, Mo : 0,5 %, Al < 2 %, jusqu'à un total de 0,5 % d'un ou plusieurs des éléments B, Nb, Ti, V, Zr, Ca.
EP14736716.3A 2013-07-03 2014-07-01 Procédé pour laminer à chaud des feuillards d'acier Active EP3016754B2 (fr)

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PCT/EP2014/063955 WO2015000895A1 (fr) 2013-07-03 2014-07-01 Installation et procédé pour laminer à chaud des feuillards d'acier

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EP3016754A1 (fr) 2016-05-11
WO2015000895A1 (fr) 2015-01-08
DE102013107010A1 (de) 2015-01-22
MX364428B (es) 2019-04-25
ES2756453T3 (es) 2020-04-27
CN105392574B (zh) 2019-01-18
KR102212807B1 (ko) 2021-02-05
CA2914540C (fr) 2018-01-16
JP2016530099A (ja) 2016-09-29
PL3016754T3 (pl) 2020-02-28
US10335840B2 (en) 2019-07-02
CN105392574A (zh) 2016-03-09
KR20160030218A (ko) 2016-03-16
CA2914540A1 (fr) 2015-01-08
JP6450379B2 (ja) 2019-01-09
US20160151814A1 (en) 2016-06-02
EP3016754B1 (fr) 2019-09-04

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