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Method for producing grain-oriented electromagnetic steel sheet

A manufacturing method, the technology of electromagnetic steel plate, applied in the direction of manufacturing tools, circuits, magnetic objects, etc., to achieve the effect of excellent magnetic properties, large effect, and low price

Active Publication Date: 2021-11-26
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for grain-oriented electrical steel sheets, it is not necessary to obtain high strength, so the above-mentioned rapid cooling is not applied.

Method used

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  • Method for producing grain-oriented electromagnetic steel sheet
  • Method for producing grain-oriented electromagnetic steel sheet
  • Method for producing grain-oriented electromagnetic steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A slab having the composition shown in Table 3, with the remainder consisting of Fe and unavoidable impurities was produced by continuous casting, heated to a temperature of 1280°C, and then hot-rolled to obtain a hot-rolled sheet with a thickness of 2.2 mm. , the hot-rolled sheet was annealed at 1050° C. for 20 seconds. At this time, the average cooling rate between 800°C and 300°C and between 300°C and 100°C in the cooling process of annealing the hot-rolled sheet was changed as shown in Table 4. Then, after cold rolling into a cold-rolled sheet with a final plate thickness of 0.23 mm, in 60 volume %H 2 -40vol%N 2 In addition, primary recrystallization annealing also serving as decarburization annealing was performed at 830° C. for 150 seconds in a humid atmosphere with a dew point of 55° C. At this time, the average temperature increase rate between 500° C. and 700° C. during the heating process was set to 200° C. / sec.

[0069] Then, after the above-mentioned prim...

Embodiment 2

[0075] Contains C: 0.049% by mass, Si: 3.5% by mass, Mn: 0.069% by mass, sol.Al: 0.0070% by mass, N: 0.0035% by mass, and S: 0.0010% by mass, with the balance consisting of Fe and The steel slab made of avoided impurities was reheated to a temperature of 1230° C., and then hot-rolled to form a hot-rolled sheet with a thickness of 2.0 mm. The hot-rolled sheet was subjected to hot-rolled sheet annealing at 950° C.×20 seconds. Then, the intermediate sheet thickness was adjusted to 1.3 mm by the first cold rolling, and intermediate annealing was performed at 1060° C. for 60 seconds, and then the second cold rolling was performed to obtain a cold-rolled sheet having a final sheet thickness of 0.20 mm. At this time, the average cooling rate between 800°C and 300°C and between 300°C and 100°C in the cooling process of the hot-rolled sheet annealing and intermediate annealing was changed as shown in Table 5. Next, at 55 vol% H 2 -45vol%N 2 In addition, primary recrystallization anne...

Embodiment 3

[0081] In the same manner as in Example 2, a continuous casting method containing C: 0.049% by mass, Si: 3.5% by mass, Mn: 0.069% by mass, sol.Al: 0.0070% by mass, N: 0.0035% by mass and S: 0.0010% by mass , the balance of which is composed of Fe and unavoidable impurities is heated to a temperature of 1280°C, and then hot-rolled to form a hot-rolled sheet with a thickness of 2.5 mm. The hot-rolled sheet is subjected to 1,000°C×60 seconds Annealing of hot-rolled sheets. At this time, the average cooling rate between 800°C and 300°C and between 300°C and 100°C in the cooling process of annealing the hot-rolled sheet was changed as shown in Table 6. Then, the intermediate sheet thickness was adjusted to 1.8 mm by the first cold rolling, and intermediate annealing was performed at 1080° C. for 60 seconds, and then the cold rolled sheet having a final sheet thickness of 0.23 mm was produced by the second cold rolling. At this time, the average cooling rate between 800° C. and 100...

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Abstract

In the present invention, when a grain-oriented electromagnetic steel sheet is produced by heating a steel slab that contains, in terms of mass%, 0.020-0.10% of C, 2.0-4.0% of Si, 0.005-0.50% of Mn, less than 0.010 of Al, and less than 0.0050% of each of N, S and Se, at a temperature of no more than 1280 DEG C, and then hot rolling the steel slab, carrying out hot-rolled sheet annealing, carrying out cold rolling once or cold rolling two or more times with intermediate annealing carried out therebetween, carrying out primary recrystallized annealing that also serves as decarburization annealing, coating a surface of the steel sheet with an annealing-separation agent, carrying out finish annealing, and then carrying out flattening annealing, a grain-oriented electromagnetic steel sheet having excellent magnetic characteristics is stably obtained, such steel sheet being produced by rapidly cooling at an average cooling rate of 200 DEG C / s or more from 800 DEG C to 300 DEG C in a cooling process from the maximum attained temperature in the hot-rolled sheet annealing and / or the intermediate annealing.

Description

technical field [0001] The present invention relates to a method for producing a grain-oriented electrical steel sheet suitable for use as a core material of a transformer or the like. Background technique [0002] Grain-oriented electrical steel sheets are soft magnetic materials used as core materials for transformers, generators, etc., and are characterized by having a crystal structure in which the <001> orientation, which is the easy magnetization axis of iron, is highly aligned along the rolling direction of the steel sheet. , excellent magnetic properties. The above crystal structure is formed by preferentially secondary recrystallizing and massively growing {110}<001> oriented crystal grains called so-called Goss oriented (Goss) oriented grains in the final annealing of the production process of the grain oriented electrical steel sheet. [0003] As a method for inducing the above-mentioned secondary recrystallization, a technique using a precipitate cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/00C22C38/06C22C38/60H01F1/147
CPCC22C38/60C22C38/02C22C38/04C22C38/001C22C38/16C22C38/22C22C38/34C22C38/008C22C38/08C22C38/12C21D8/1261C21D8/1266C21D8/1272C21D2201/05C21D9/46C21D6/008C21D8/1238C21D8/1283H01F1/16H01F1/14775C22C38/06C22C38/48C22C38/54C22C38/42C21D8/1222C21D8/1233H01F1/147C21D6/001C21D6/002C21D6/005C22C38/002C22C38/20C22C38/24C22C38/26C22C2202/02
Inventor 江桥有衣子新垣之启杉原广和吉本宗司
Owner JFE STEEL CORP
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