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Method for producing high magnetic induction grain-oriented silicon steel

A high magnetic induction orientation and production method technology, applied in the field of silicon steel production, can solve problems such as difficulty in obtaining stable magnetic performance products, uneven nitriding, etc., and achieve the effects of large potential benefits, uniform nitriding, and high efficiency

Active Publication Date: 2011-05-04
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a production method of high magnetic induction oriented silicon steel, to solve the problem that it is difficult to obtain stable magnetic performance products due to uneven nitriding when producing high magnetic induction oriented silicon steel by slab low temperature heating technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Smelt and cast according to the chemical composition described in Table 1. The slab was kept in a heating furnace at 1160°C for 2 hours and then hot-rolled to a hot-rolled plate with a thickness of 2.5mm. The starting and finishing temperatures were 1085°C and 890°C, respectively. The hot-rolled sheet is rapidly cooled after being kept at 900°C for 5 minutes, then cold-rolled to 0.35mm after pickling. Nitriding treatment is carried out in a tube furnace, the nitriding temperature is 700 °C, and then in wet H 2 -N 2 Decarburization under a mixed atmosphere, the decarburization temperature is 800°C, the time is 5min, and the dew point is 25°C. After coating MgO spacer, perform high temperature annealing and planar annealing, coat insulating layer, and measure magnetism. The experimental results are shown in Table 2.

[0031] Table 1 Chemical Composition of Experimental Steel Unit: %

[0032] Example

C

Si

als

mn

S

P

N

...

Embodiment 2

[0037] Smelt and cast according to the chemical composition described in Table 1. The slab was kept in a heating furnace at 1160°C for 2 hours and then hot-rolled to a hot-rolled plate with a thickness of 2.5mm. The starting and finishing temperatures were 1080°C and 880°C, respectively. The hot-rolled sheet is rapidly cooled after being kept at 900°C for 5 minutes, then cold-rolled to 0.35mm after pickling. The nitriding temperature is 700°C, the ammonia concentration is 5%; the decarburization process is: 800°C for 5 minutes, and the atmosphere is wet 75% H 2 -N 2 , with a dew point of 25°C; after coating with MgO release agent, perform high temperature annealing and planar annealing, coat an insulating layer, and measure magnetism. The relationship between nitriding time, nitriding amount and magnetic properties is shown in Table 3.

[0038] Table 3 Relationship between nitriding time, nitriding amount and magnetic properties

[0039] serial number

[0040] ...

Embodiment 3

[0042]Smelt and cast according to the chemical composition described in Table 1. The slabs were kept in a heating furnace at 1160°C for 2 hours and then hot-rolled to hot-rolled sheets of different thicknesses. The starting and finishing temperatures were 1080°C and 880°C, respectively. The hot-rolled sheet is rapidly cooled after being kept at 900°C for 5 minutes, then cold-rolled to 0.35mm after pickling. The nitriding temperature is 700°C, the ammonia concentration is 5%, and the nitriding time is 30s; the decarburization process is: 800°C for 5min, and the atmosphere is wet 75%H 2 -N 2 , with a dew point of 25°C; after coating with MgO release agent, perform high temperature annealing and planar annealing, coat an insulating layer, and measure magnetism. The relationship between different cold rolling reductions and magnetic properties is shown in Table 4.

[0043] Table 4 Relationship between different cold rolling reductions and magnetic properties

[0044] ...

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Abstract

The invention relates to a method for producing high magnetic induction grain-oriented silicon steel, and belongs to the technical field of silicon steel production. The process comprises the following steps of: smelting, refining, and performing continuous casting to obtain a casting blank; performing hot rolling; normalizing, namely performing normalizing annealing and cooling; performing cold rolling at one time, wherein the cold rolling reduction ratio is 85 to 90 percent; nitriding by using a nitriding medium, namely dry NH3 at the temperature of between 600 and 740 DEG C for 5 to 40 seconds; decarburizing at the temperature of between 750 and 850 DEG C for 60 to 360 seconds, wherein the dew-point temperature is 25 DEG C; and annealing at a high temperature, and coating a stress coating. The method has the advantages that: a plate blank low-temperature heating process of nitriding at the temperature of between 600 and 740 DEG C and decarburizing annealing is adopted, the nitriding of a steel plate is not influenced by an oxidation film, the steel plate is uniformly nitrided, and efficiency is high; by controlling the nitriding and decarburizing processes, an appropriate amount of effective (Al, Si) N inhibitor is formed, and high magnetic property is achieved; and nitriding is performed at a low temperature, so energy consumption is low, and production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of silicon steel production, and in particular relates to a production method of high magnetic induction oriented silicon steel, which uses a low-temperature nitriding method to produce high magnetic induction oriented silicon steel. Background technique [0002] In the production of grain-oriented silicon steel, the most critical thing is to effectively control the inhibitor. There are two ways to obtain the inhibitor: one is to add it during steelmaking; the other is to add it in the post-process of silicon steel production. The high-temperature heating process of slab was formed based on the idea of ​​adding inhibitors during steelmaking; the low-temperature heating process of slab was formed based on the idea of ​​adding inhibitors in later processes. Described below respectively. [0003] A traditional oriented silicon steel production method is the slab high-temperature heating process. The specific ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/12
Inventor 冯莉莉王全礼许学勇夏兆所周谊军董浩赵楠潘丽梅张莉霞王崇学耿立王宝川
Owner SHOUGANG CORPORATION
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