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Manufacturing method and nitriding treatment equipment of grain-oriented electrical steel sheet

A technology of electromagnetic steel sheet and manufacturing method, which is applied in the direction of heat treatment equipment, lighting and heating equipment, manufacturing tools, etc., can solve the problems such as lack of magnetic properties, and achieve the effect of suppressing deterioration and good properties

Active Publication Date: 2019-05-28
JFE STEEL CORP
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, when secondary recrystallization occurs from the surface of the steel sheet, the characteristics of the structure subjected to shear deformation due to roll friction will be inherited, so good magnetic properties may not be obtained.

Method used

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  • Manufacturing method and nitriding treatment equipment of grain-oriented electrical steel sheet
  • Manufacturing method and nitriding treatment equipment of grain-oriented electrical steel sheet
  • Manufacturing method and nitriding treatment equipment of grain-oriented electrical steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0127] The slabs for various grain-oriented electrical steel sheets shown in Table 1 were heated at 1230° C. and then hot-rolled to form hot-rolled sheets with a thickness of 2.5 mm. Hot-rolled sheets were annealed at 1050° C. for 1 minute. Then, it was cold-rolled to a final thickness of 0.27 mm, and a sample of size 100 mm×400 mm was cut out from the center of the obtained cold-rolled coil, and annealing for primary recrystallization and decarburization was performed in a laboratory.

[0128] Next, nitriding treatment was performed under the nitriding conditions shown in Table 1 in a mixed atmosphere of ammonia gas, hydrogen gas, and nitrogen gas. In addition, regarding the temperature increase rate of the primary recrystallization annealing, the temperature increase rate between 500° C. and 700° C. was set at two levels of 20° C. / sec and 150° C. / sec.

[0129] In addition, in this example, 21 or 20 steel sheets under the same conditions were produced for each condition. The...

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Abstract

According to the present invention, in a series of manufacturing steps of a grain-oriented electrical steel sheet in which a steel slab having a predetermined composition is made into a final plate thickness and then subjected to a recrystallization annealing and nitriding treatment, at least two steps of high-temperature nitriding and low-temperature nitriding are performed. The nitriding treatment is carried out at different temperatures, and the residence time under the high-temperature nitriding is set to be at least 3 seconds to 600 seconds, thereby efficiently diffusing nitrogen in the steel sheet before secondary recrystallization. By depositing AlN in the steel, it is possible to provide a method for producing a grain-oriented electrical steel sheet having excellent magnetic properties.

Description

technical field [0001] The present invention relates to a method for producing a grain-oriented electrical steel sheet capable of obtaining a grain-oriented electrical steel sheet having excellent magnetic properties at low cost, and to a nitriding treatment facility used in the method. Background technique [0002] A grain-oriented electrical steel sheet is a soft magnetic material mainly used as a core material of a transformer, and has a crystal structure in which the <001> orientation, which is the easy magnetization axis of iron, is highly aligned in the rolling direction of the steel sheet. Such a texture is caused by the secondary recrystallization annealing in which the crystal grains in the [110]<001> orientation, which is called the so-called Goss orientation, grow preferentially and massively during the secondary recrystallization annealing in the production process of the grain-oriented electrical steel sheet. formed by crystallization. [0003] Conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C21D9/46C22C38/00C22C38/60C23C8/02C23C8/26H01F1/16
CPCC21D8/12C21D9/46C23C8/02C22C38/00C22C38/60H01F1/16F27B9/045F27D7/02F27D7/06C23C8/26C21D8/1222C21D8/1233C21D8/1272C21D8/1277C22C38/002C22C38/008C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/28C22C38/34C21D8/1261C21D8/1283C22C38/02C23F17/00
Inventor 新垣之启井上博贵
Owner JFE STEEL CORP
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