JP3463403B2 - Method for producing grain-oriented silicon steel sheet and apparatus for applying annealing separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a grain-oriented silicon steel sheet used for an iron core of a transformer or other electric equipment and an apparatus for applying an annealing separator.

[0002]

2. Description of the Related Art Generally, a process for producing a grain-oriented silicon steel sheet is to subject a steel slab to hot rolling, then to cold rolling, then to decarburizing annealing, and then to final finishing annealing for secondary recrystallization. It is a target. Among these, secondary recrystallization occurs during the final finish annealing, and coarse crystal grains having a uniform axis of easy magnetization in the rolling direction are formed. Since the finish annealing is performed for a long time, an annealing separator mainly composed of MgO is usually applied to prevent the seizure of the steel sheet. This MgO has a function of forming a forsterite film by reacting with an oxide layer mainly composed of SiO ₂ at the time of decarburization annealing, in addition to the role of the annealing separator. Since the forsterite film is formed at a high temperature during the finish annealing, a tension is applied to the steel sheet due to a difference in the coefficient of thermal expansion between the film and the ground iron, the magnetic domains are subdivided, and iron loss is reduced.

[0003] In addition, if the adhesion of the forsterite film is inferior or insufficient, the insulating coating applied after the final annealing becomes difficult to apply or peels off partly. Deterioration of rust resistance.
Therefore, the quality of the forsterite coating is an important factor that affects the magnetic properties and coating properties of the grain-oriented silicon steel sheet.

For this reason, various methods for improving the quality of the forsterite film have been disclosed. For example,
No. 60-197883 discloses that the dew point in the finish annealing atmosphere is
A method for forming a good forsterite film by specifying Mn, S, and Se is disclosed. Also,
Japanese Patent Application Laid-Open No. Hei 6-17261 discloses a method for improving the magnetic properties by increasing the tensile effect by forming a film formed at the time of secondary recrystallization annealing with an oxide containing forsterite and Al and Si. I have. Further, Japanese Patent Application Laid-Open No. 53-5800 discloses a method for forming a uniform coating by defining the forsterite particle size.

[0005] However, although these techniques have improved the film properties and magnetic properties to some extent, it is hard to say that sufficient effects have been obtained. In particular, the demand for further improvement of iron loss has been increasing more and more due to the recent deterioration of the energy situation.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to propose a method and an apparatus for improving magnetic properties by improving a forsterite film in view of the above circumstances.

[0007]

That is, according to the present invention, a steel ingot containing 0.02 to 0.10% of C and 2 to 4% of Si by weight is heated to 1300 ° C. or higher in a heating furnace and then hot-rolled. 1. Applying cold rolling one or more times including intermediate annealing to finish to the final sheet thickness, then apply decarburizing annealing, and then spray the slurry-like annealing separator on the front and back surfaces of the steel plate or the upper and lower surfaces of the roll coater. the puddle slurry was formed on the steel sheet, the annealing separator was applied by a roll coater, after drying in the manufacturing method of the grain-oriented silicon steel sheet composed of a series of steps for performing the final annealing, slurry to be the jet Annealing separation
2~250mm the length from the roll coater contact point of reservoir slurry solution in the roll coater inlet side to adjust the agent
A method for producing a grain-oriented silicon steel sheet.
You. In the present invention , C is 0.02 to 0.10% and Si is
Ingots containing 2 to 4% are heated to 1300 ° C or higher in a heating furnace.
Hot after hot rolling, one or more times including intermediate annealing
After cold rolling and finishing to the final thickness, decarburizing annealing is performed.
And then apply the slurry-like annealing separator on the front and back of the steel sheet or
By spraying on the upper and lower surfaces of the roll coater,
Form a liquid pool, apply an annealing separator, and dry
-Oriented silicon consisting of a series of steps for final finishing annealing
The method of manufacturing a steel sheet, oriented silicon, characterized by a length from the roll coater contact point of reservoir slurry by blowing gas fluid or slurry of the annealing separating agent to a roll coater entry side to 2~250mm Steel plate
It is a manufacturing method. In addition , the present invention provides that C is 0.02% by weight.
~ 0.10%, steel ingot containing 2-4% Si in heating furnace for 1300
After high temperature heating to ℃ or higher, hot rolling, once or intermediate annealing
After finishing cold rolling multiple times including
After decarburizing annealing, the slurry-type annealing separator
By spraying on the front and back or the top and bottom of the roll coater
Form a slurry pool on the steel sheet and apply an annealing separator.
From a series of processes where the cloth is dried and then subjected to final finish annealing
In the method for producing a grain-oriented silicon steel sheet, the length of the slurry liquid pool from the roll coater contact point is adjusted by adjusting the jet speed of the slurry-like annealing separator or gas fluid by the roll speed when passing through the roll coater to 2 to 250 mm. To
A method for producing a grain-oriented silicon steel sheet.

Further, the present invention has upper and lower roll coaters.
And apply an annealing separator on the slurry to the surface of the steel sheet.
A slurry supplying slurry- type annealing separator to the roll coater input side in a lu coater-type annealing separator coating device.
-Provide a supply nozzle and a supply roll, and further
Between the supply roll and the roll coater, the roll
Form from the contact point of the coater to the supply roll side.
This is an annealing separator applying device in which a gas fluid spraying device or a slurry-like annealing separating agent spraying device for adjusting the length of the formed slurry liquid pool is arranged. The "slurry liquid pool" in the present invention refers to a liquid pool of a slurry-like annealing separating agent formed on a steel sheet on the entry side of a roll coater.

[0009]

The present inventors have conducted various studies on the relationship between the coating conditions of MgO and the appearance and magnetic properties of the film formed after the final finish annealing. As a result, the annealing separator was made into a slurry and sprayed with a spray nozzle. A method of manufacturing a directional silicon steel sheet comprising a series of steps of applying to a steel sheet by spraying onto the steel sheet surface, both front and back surfaces, or onto the upper surface or upper and lower surfaces of the roll coater and then performing final finish annealing, as shown in FIG. By keeping the length L from the contact point of the roll coater of the slurry liquid reservoir 4 formed on the steel plate 7 on the entry side of 1 within a certain range, a uniform forsterite film is formed and the magnetic properties are improved. I found it. The experiment that led to this discovery is described below.

C: 0.045 wt% (hereinafter expressed as%), Si:
3.25%, Al: 0.02%, N: 0.0080%, Mn: 0.07%, Se:
A silicon steel slab containing 0.02% and the balance being substantially Fe
After heating at 1380 ° C for 30 minutes and hot rolling to a plate thickness of 2.2 mm, 10
Cold-rolled to 0.23mm thickness with intermediate annealing at 50 ° C for 1 minute,
Finished to the final thickness. After decarburizing annealing, when an annealed separating agent mainly composed of MgO is made into a slurry and ejected to the upper surface of the steel plate by the spray nozzle 2, the length of the slurry liquid pool 4 on the inlet side of the roll coater 1 from the contact point of the coater is measured. L was varied and applied. The length of the slurry liquid pool was adjusted by the slurry ejection strength of the spray nozzle 2 provided on the roll coater entry side. The magnetic properties and coating appearance of the thus obtained steel sheet were investigated. FIG. 2 shows the relationship between the slurry liquid pool length and the magnetic properties. As can be seen from FIG. 2, there is a correlation between the liquid pool length and the magnetic characteristics, and when the liquid pool length is shorter than 250 mm, the magnetic characteristics are significantly improved. 20
Magnetic characteristics are almost constant within 0 mm.

[0011] In order to investigate the reason why the result that the magnetic properties greatly changed depending on the length of the slurry liquid pool was obtained, the present inventors investigated an insulating film formed after finish annealing from a cross section of a steel sheet. FIG. 3 shows a schematic diagram of the cross-sectional shapes of the sample when the liquid pool length was 100 mm and the sample when the liquid pool length was 300 mm.
In the sample of 100 mm, the coating 5 was formed uniformly, while in the sample of 300 mm, a large depression was found in the ground iron 6 of about 40 μm. Further, FIG. 4 shows the result of measuring the particle size distribution of the coated MgO powder with a particle size measuring device when the liquid pool length was 100 mm and 300 mm. When the liquid pool length is 100 mm, the content of particles with a particle size of 10 μm or more is about the same as or slightly less than the powder before coating, but is 300 mm.
The content of particles having a particle size of 10 μm or more is extremely higher than that of the powder before coating.

From the above, the reason why the length of the slurry liquid pool affects the magnetic characteristics is estimated as follows. When MgO is made into a slurry, coarse particles are partially formed by agglomeration of fine particles or particles sticking to a partition wall of a slurry ejection nozzle or a stirring vessel are separated. Normally, MgO particles used for grain-oriented silicon steel are fine, are not easily affected by weight, and have a small particle settling speed when slurried.However, the coarse particles have a high settling speed and easily settle and adhere to the steel sheet. I do. Coarse M adhered on steel plate
The gO particles are carried on the steel sheet as it is, and the finish annealing is performed as it is. At the time of finish annealing, the steel sheets are strongly pressed by the thermal expansion of the steel sheets, and at this time, the coarse MgO particles form a press scratch. Such push flaws impede the flow of magnetic flux and also reduce the space factor, thereby deteriorating magnetic properties.
Adjusting the length of the liquid pool of the slurry has the function of preventing the introduction of coarse MgO particles that adversely affect such characteristics. If the pool length is long, coarse MgO particles will adhere to the steel sheet before passing through the coater.However, by shortening the pool length, the coarse MgO and slurry from the end of the steel sheet will be attached before the coarse MgO adheres to the steel sheet. It is thought that because of the flow out, the adverse effect of the coarse MgO as described above does not appear, and good magnetic properties can be obtained. In addition, reducing the amount of coarse MgO stabilizes the secondary recrystallization and increases the degree of accumulation of secondary grains in the Goss orientation.

As a method for removing such coarse MgO, Japanese Patent Application Laid-Open No. Hei 5-234664 discloses a technique of grinding the roll before applying the slurry. Although the technology of applying small MgO is disclosed, the aggregation of MgO particles occurs quickly, and the sticking of MgO particles to the partition walls can occur at any time from slurry stirring to coater coating. However, the effect of the above prior art is not sufficient. The present invention is coarse
A remarkable effect can be obtained by an easy method of shortening the length of the slurry liquid pool without eliminating MgO by a complicated method.

The reasons for limiting the present invention will be described below.
The silicon-containing steel as the material of the present invention is as follows. First, C is 0.02 to 0.10%. This is intended to improve the texture, and a good texture is not formed in any case outside this range. Si is 2 to 4%. If it is less than 2%, the effect of reducing iron loss is weakened, and if it is more than 4%, the cold rolling property is impaired. Inhibitor constituent elements are added in addition to these elements. As the inhibitor constituent element, any known element may be used. MnS and / or MnSe
When using Mn: 0.03 to 0.10%, S + Se: 0.01 to 0.03
%. In addition, when AlN is used as an inhibitor, Al: 0.01 to 0.04% and N: 50 to 120 ppm. If it is lower than these ranges, there is no effect as an inhibitor, and if it is higher, secondary recrystallization becomes unstable. In addition, Cu, Sn, Cr, Sb, Ge, Mo, Te, Bi, P, V and the like can be used. In order to sufficiently dissolve these inhibitor components, slab heating requires 1300 ° C. or higher. Each of these inhibitors can be used alone or in combination. These materials are hot-rolled by a known method, and then cold-rolled once or a plurality of times including intermediate annealing to obtain a final sheet thickness. It is also necessary to perform annealing of the hot-rolled sheet before cold-rolling as necessary. After these treatments, decarburization annealing is performed, and after applying an annealing separating agent, final finish annealing is performed.

The annealing separator is mainly composed of MgO, Al ₂
Although there are those mainly composed of O ₃ , both are used.
Further, an auxiliary agent may be added to the annealing separator in addition to MgO and Al ₂ O ₃ . TiO ₂ , SrSO ₄ , MgSO ₄ or the like is used as an auxiliary agent. TiO ₂ is preferably in the range of 1 to 15%. If it is less than 1%, there is no effect, and if it exceeds 15%, the ratio of MgO decreases and forsterite formation does not proceed. SrSO ₄ and MgSO ₄ is to obtain reasonable inhibition effect for the purpose of reinforcing the inhibitor it is preferable to add 0.05% to 5%. In addition,
Compounds such as Sb, B, Zr, Nb, and Cl, which are conventionally known auxiliaries, can also be used.

As a method for jetting the slurry-like annealing separating agent, for example, a method using a spray nozzle is simple, but other known methods can also be applied. At this time, the slurry is sprayed when spraying on the steel sheet by spraying on the front and back of the steel sheet or the upper and lower surfaces of the roll coater .
Adjust the annealing separator a length of the liquid pool on the steel plate 2 to 25
0 mm. If it exceeds 250 mm, coarse MgO particles adhere to the steel sheet and have an adverse effect during finish annealing. In addition, when it is less than 2 mm, it becomes difficult to control the initial amount of coating, so it is 2 to 250 mm.
And In addition, as a method of controlling the length of the liquid pool, there are a method of spraying a gas fluid on the roll coater inlet side, and a method of spraying a slurry having the same composition as the liquid supply to the roll coater on the roll coater inlet side. Also, since the length of the slurry pool from the coater contact point changes depending on the roll speed when passing through the roll coater, a method of adjusting the jet speed of the slurry or gas fluid by the roll speed to make the pool length 2 to 250 mm is also possible. is there.

After these series of processes, finish annealing is performed. The finish annealing may be performed by a known method. Thereafter, an insulating tension coat is applied and flattening annealing is performed to finish the product. By such a processing step, a directional silicon steel having excellent magnetic properties can be obtained. As shown in FIG. 1, a slurry 3 containing an annealing separator is simply sprayed onto the front and back surfaces of a steel plate 7 by a spray nozzle 2 to form a liquid pool 4 of a slurry having a total length L, as shown in FIG. May be applied.

FIG. 5 is a schematic diagram showing another MgO slurry coating apparatus of the present invention. In FIG. 5, 1 is an upper and lower roll coater, 7 is a steel plate, 8 is a reserve tank for storing a water slurry of an annealing separator, 9 is a liquid feed pump, 10 is a slurry supply nozzle, 11 is a supply roll, and 12 is a gas spray. Nozzle. That is, before the steel sheet 7 is subjected to high-temperature finish annealing, a slurry-like annealing separating agent is supplied to the surface of the steel sheet 7 by the slurry supply nozzle 10 and the supply roll 11, and the slurry is squeezed by the roll coater 1 to a predetermined thickness. An annealing separator having a predetermined thickness is applied to the surface of the steel plate 7.

At this time, a slurry liquid pool 4 is formed from the contact point of the roll coater 1 toward the supply roll 11 side. In order to adjust the length of the slurry liquid pool 4, gas is sprayed from the gas spray nozzle 12 Spray. In this embodiment, the diameter of the gas blowing nozzle 12 is 5 mm, and the gas pressure is 2 kg / cm ² . By spraying the gas from the gas spray nozzle 12, the liquid stored in the steel plate 7 is flown from the side of the steel plate, and the length of the slurry liquid pool is reduced. When the gas spray nozzle 12 was not installed, the length of the slurry reservoir 4 became 360 mm.
By attaching 12, the length of the slurry pool 4
Shortened to 120mm.

FIG. 6 is a schematic view showing another MgO slurry coating apparatus of the present invention. In FIG. 6, 1 is an upper and lower roll coater, 7 is a steel plate, 8 is a reserve tank for storing a water slurry of an annealing separator, 9 is a liquid feed pump, 10 is a slurry supply nozzle, 11 is a supply roll, and 13 is a slurry. A liquid supply pump for supplying to the spray nozzle 14,
The slurry spray nozzle 14 reduces the length of the slurry liquid pool.

That is, before the steel sheet 7 is annealed at high temperature, a slurry-like annealing separating agent is supplied to the surface of the steel sheet 7 by the slurry supply nozzle 10 and the supply roll 11, and the slurry is further reduced to a predetermined thickness by the roll coater 1. A predetermined thickness of an annealing separator is applied to the surface of the drawn steel plate 7. At this time, the slurry liquid pool 4 is formed on the steel plate 7 from the contact point of the roll coater 1 toward the supply roll 11 side.
Slurry is sprayed from a slurry spray nozzle 14 in order to adjust the length of the slurry liquid pool 4. In this embodiment, the diameter of the slurry spraying nozzle 14 is 5 mm, and the flow rate of the liquid sending pump 13 for supplying the slurry to the slurry spraying nozzle 14 is 60 l / min. As a liquid to be sprayed, a slurry for an annealing separating agent was taken out of the reserve tank 8. By spraying the slurry from the slurry spray nozzle 14, the liquid retained on the steel plate 7 is flowed from the side of the steel plate, and the length of the slurry liquid pool is reduced. If the slurry is not ejected by the spray, the pool length is 360mm
However, by ejecting the slurry,
Shortened to 90mm.

[0022]

【Example】

(Example 1) C: 0.06%, Si: 3.28%, Mn: 0.07%, S
A slab containing e: 0.02% and Sb: 0.03% and substantially consisting of the balance remaining Fe is heated to 1400 ° C, hot-rolled to a thickness of 2.2mm, and cooled to 0.23mm at 1050 ° C with a 2-minute intermediate annealing. It was rolled and finished to the final thickness. After decarburizing annealing, M
6% TiO ₂ and 1% SrSO ₄ were added to gO, applied with a roll coater and dried. At this time, the length of the liquid pool of MgO was changed variously by blowing gas from the inlet side of the roll coater. After that, finish annealing at 850 ° C for 50 hours
After constant annealing, purifying annealing was performed at 1150 ° C. for 5 hours in a dry H ₂ atmosphere.

Table 1 shows the results of investigation of the magnetic properties of the steel sheet thus obtained. Within the scope of the present invention, excellent magnetic properties are obtained, and the coating is uniform.

[0024]

[Table 1]

(Example 2) C: 0.06%, Si: 3.28%, M
n: 0.07%, Se: 0.02%, Sb: 0.025%, Al: 0.025
%, N: The slab containing 0.009% and substantially the balance of Fe is heated to 1400 ° C, hot-rolled to a thickness of 2.2 mm, and subjected to intermediate annealing at 1050 ° C for 2 minutes and cold-rolled to 0.23 mm. Finished to the final thickness. After decarburization annealing, this was added to MgO as an annealing separator.
% TiO ₂ was added, and the mixture was applied and dried using a roll coater. At this time, the length of the MgO slurry liquid pool was changed variously by spraying a slurry having the same composition as the coating liquid from the inlet side of the roll coater. Afterwards as finish annealing
After holding at 850 ° C for 15 hours, continue from 850 to 1150 ° C.
The temperature was raised at 15 ° C./h, and subsequently, purification annealing was performed at 1150 ° C. for 5 hours in a dry H ₂ atmosphere.

The results of investigating the magnetic properties of the steel sheet thus obtained are shown in Table 2. Even when the material contains Al and N, the magnetic properties are improved within the scope of the present invention.

[0027]

[Table 2]

(Example 3) C: 0.06%, Si: 3.28%, M
n: 0.07%, S: 0.02%, Sn: 0.025%, Cu: 0.1%, A
l: Silicon steel ingot containing 0.025%, N: 0.009% at 1380 ℃
After heating for 0 minutes and hot rolling to a sheet thickness of 2.2 mm,
It was cold rolled to a thickness of 0.22 mm with intermediate annealing for a minute, and finished to a final thickness. After decarburization annealing, MgO was used as an annealing separator.
A mixture of 6% TiO ₂ and 1% SrSO ₄ was applied by a roll coater and dried. At this time, the length of the MgO slurry liquid pool was variously changed by adjusting the spraying amount of the slurry having the same composition as the coating liquid from the coater entrance side in relation to the roll speed. After that, 850 ~
The temperature was raised to 1150 ° C. at a rate of 15 ° C./h, followed by purification annealing at 1150 ° C. × 5 h in a dry H ₂ atmosphere.

Table 3 shows the results obtained by examining the magnetic properties of the steel sheet thus obtained. High magnetic properties are realized within the scope of the present invention.

[0030]

[Table 3]

[0031]

The present invention relates to a method for producing a grain-oriented silicon steel sheet, wherein the length of the slurry liquid pool on the roll coater entrance side from the contact point of the roll coater when the slurry-like annealing separating agent is applied after the decarburizing annealing. Is set to 250 mm or less, it is possible to produce oriented silicon steel having high magnetic properties, and thus greatly contribute to quality improvement.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pattern of a liquid pool formed on a roll coater entrance side.

FIG. 2 is a graph showing a relationship between a liquid pool length and magnetic properties.

FIG. 3 is a schematic diagram when the cross section of the coating film after annealing when the liquid pool length is 100 mm and 300 mm is observed with an optical microscope.

Fig. 4 Liquid pool length and particle size of steel sheet surface after coating and drying
FIG. 4 is an explanatory diagram showing the content of MgO of 10 μm or more.

FIG. 5 is a schematic view showing one embodiment of an annealing separator applying apparatus of the present invention.

FIG. 6 is a schematic view showing another embodiment of the annealing separator applying apparatus of the present invention.

[Explanation of symbols]

1 roll coater 2 spray nozzle 3 slurry 4 pool 5 Coating 6 local railways 7 Steel plate 8 Reserve tank 9 Liquid sending pump 10 Slurry supply nozzle 11 Supply roll 12 Gas spray nozzle 13 Liquid pump 14 Slurry spray nozzle

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI H01F 1/16 H01F 1/16 B (72) Inventor Katsuro Yamaguchi 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Pref. Mizushima Works, Ltd. (56) References JP-A-61-96081 (JP, A) JP-A-62-71575 (JP, A) JP-A-5-9565 (JP, A) JP-A-63-286521 ( JP, A) JP-A-62-67118 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C21D 9/46 501 C21D 8/12 C22C 38/00-38/60 C23C 22 / 00 B05D 7/14 H01F 1/16-1/18

Claims (6)

(57) [Claims] C. 0.02 to 0.10% of C and 2 to 2% of Si by weight%.
The steel ingot containing 4% is heated in a heating furnace to a high temperature of 1300 ° C or higher, then hot-rolled, subjected to one or more cold rollings including intermediate annealing to finish the final sheet thickness, and then decarburized annealing. After that, a slurry liquid pool is formed on the steel sheet by spraying the slurry-like annealing separator on the front and back surfaces of the steel sheet or the upper and lower surfaces of the roll coater, and the annealing separator is coated with a roll coater and dried. the method of manufacturing a grain-oriented silicon steel sheet composed of a series of steps for performing the final annealing, is the jet
A method for producing a grain-oriented silicon steel sheet, characterized in that the length of the slurry pool on the entry side of the roll coater from the contact point of the roll coater is 2 to 250 mm by adjusting the slurry-like annealing separator . 2. The composition according to claim 1 , wherein C is 0.02 to 0.10% and Si is 2 to 2% by weight.
After heating a steel ingot containing 4% to 1300 ° C or higher in a heating furnace
Hot rolling, one or more cold treatments including intermediate annealing
After rolling and finishing to the final thickness, decarburizing annealing is performed,
After slurry annealed separating agent on steel sheet front or back or roll
Slurry liquid on steel plate
Form a puddle, apply an annealing separator, dry, and then
Of oriented silicon steel sheet consisting of a series of steps for finish annealing
In the method, it characterized by a length from the roll coater contact point of reservoir slurry by blowing gaseous fluid to the roll coater entry side to 2~250mm
Method for producing a square-tropic silicon steel sheet. 3. The composition according to claim 2, wherein C is 0.02 to 0.10% and Si is 2 to 2% by weight.
After heating a steel ingot containing 4% to 1300 ° C or higher in a heating furnace
Hot rolling, one or more cold treatments including intermediate annealing
After rolling and finishing to the final thickness, decarburizing annealing is performed,
After slurry annealed separating agent on steel sheet front or back or roll
Slurry liquid on steel plate
Form a puddle, apply an annealing separator, dry, and then
Of oriented silicon steel sheet consisting of a series of steps for finish annealing
In the production method, production of tropic silicon steel sheet towards you, characterized in that the length of the roll coater contact point of reservoir slurry by spraying a slurry of the annealing separating agent to a roll coater entry side to 2~250mm Method. 4. A method according to claim 1 , wherein C is 0.02 to 0.10% and Si is 2 to 2% by weight.
After heating a steel ingot containing 4% to 1300 ° C or higher in a heating furnace
Hot rolling, one or more cold treatments including intermediate annealing
After rolling and finishing to the final thickness, decarburizing annealing is performed,
After slurry annealed separating agent on steel sheet front or back or roll
Slurry liquid on steel plate
Form a puddle, apply an annealing separator, dry, and then
Of oriented silicon steel sheet consisting of a series of steps for finish annealing
In the production method, the length of the slurry liquid pool from the roll coater contact point is adjusted to 2 to 250 mm by adjusting the ejection speed of the slurry-like annealing separator or gas fluid by the roll speed when passing through the roll coater. method of manufacturing a tropic silicon steel sheet towards you. 5. A steel sheet having upper and lower roll coaters,
In a roll coater type coating apparatus for applying an annealing separating agent on the surface, a slurry of annealing content in the roll coater entry side
Slurry supply nozzle and supply roll to supply release agent
Provided, further, the supply roll and the roll coater
Between the contact point of the roll coater and the supply roll.
The length of the slurry pool formed toward the
An apparatus for applying an annealing separating agent, wherein an apparatus for spraying a gas fluid to be adjusted is arranged. 6. A steel sheet having upper and lower roll coaters.
In a roll coater type coating apparatus for applying an annealing separating agent to the surface, the roll coater entry side, a slurry of the annealing
Slurry supply nozzle and supply roll to supply separating agent
And the supply roll and the roll coater
Between the contact point of the roll coater and the supply
Length of slurry liquid pool formed toward roll side
An apparatus for spraying an annealing separator in the form of a slurry for adjusting the temperature.