Production method of high magnetic induction oriented silicon steel

A technology of high magnetic induction orientation and production method, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve problems such as difficulty in nitriding, achieve fine and uniform initial crystal grains, reduce production costs, and smelt The effect of easy operation

Active Publication Date: 2010-09-29
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a production method of high magnetic induction oriented silicon steel products, to solve the problem of difficult nitriding in the decarburization process when low temperature slab heating technology is used to produce high magnetic induction oriented silicon steel

Method used

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  • Production method of high magnetic induction oriented silicon steel
  • Production method of high magnetic induction oriented silicon steel
  • Production method of high magnetic induction oriented silicon steel

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Experimental program
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Effect test

Embodiment 1

[0035] Smelt and cast according to the chemical composition described in Table 1. The slabs with different compositions were kept in a heating furnace at 1175°C for 90 minutes and then hot-rolled to a hot-rolled plate with a thickness of 2.5mm. The starting and finishing temperatures were 1082°C and 947°C, respectively. Normalization and nitriding are carried out simultaneously for hot-rolled sheets, and an appropriate normalization nitriding process is selected: normalization nitriding temperature 1115°C—time 75s—dew point 40°C—NH 3Ratio 25%—cooling start temperature 820°C—cooling rate 23°C / s—infiltration [N] content 172ppm. Then it is pickled and cold-rolled to a finished product thickness of 0.30mm. Decarburization annealing was carried out under the conditions of heating rate of 26°C / s, decarburization temperature of 815°C, and uniform temperature of 150s, so that the [C] content in the steel plate was reduced to below 30ppm. After coating the release agent with MgO as t...

Embodiment 2

[0041] The components and weight percentages of oriented silicon steel slabs are Si: 3.25%, C: 0.070%, S: 0.009%, Als: 0.033%, N: 0.05%, Mn: 0.15%, Sn: 0.008%, and the rest are Fe and unavoidable impurities.

[0042] The different hot rolling process conditions are shown in Table 2 below. For the 2.3mm hot-rolled sheet, the normalization and nitriding are carried out simultaneously, and the appropriate normalization nitriding process is selected: normalization nitriding temperature 1085°C—time 65s—dew point 30°C—NH 3 Ratio 20%—cooling start temperature 780°C—cooling rate 33°C / s—infiltration [N] content 145ppm. Then it is pickled and cold-rolled to a finished product thickness of 0.30mm. Decarburization annealing was carried out under the conditions of heating rate of 29°C / s, decarburization temperature of 855°C, and uniform temperature of 120s, so that the [C] content in the steel plate was reduced to below 30ppm. After coating the release agent with MgO as the main compone...

Embodiment 3

[0047] The components and weight percentages of oriented silicon steel slabs are Si: 3.25%, C: 0.070%, S: 0.009%, Als: 0.033%, N: 0.05%, Mn: 0.15%, Sn: 0.008%, and the rest are Fe and unavoidable impurities. It was kept in a heating furnace at 1190°C for 30 minutes and then hot-rolled to a hot-rolled plate with a thickness of 2.3mm. The starting and finishing temperatures were 1080°C and 942°C, respectively. Different normalization and nitriding process conditions are shown in Table 3 below. Then it is pickled and cold-rolled to a finished product thickness of 0.30mm. Decarburization annealing was carried out under the conditions of heating rate of 28°C / s, decarburization temperature of 855°C, and uniform temperature of 140s, so that the [C] content in the steel plate was reduced to below 30ppm. After coating the release agent with MgO as the main component, in the atmosphere of 100% H 2 , The dew point is -10°C, and the temperature is 1200°C for 20 hours of high temperatur...

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Abstract

The invention relates to a production method of high magnetic induction oriented silicon steel, comprising the steps of smelting, continuous casting, hot rolling, normalization, decarbonization and annealing, MgO coating, high-temperature annealing and insulation coating, wherein the normalization comprises the steps that: normalization is carried out on a hot rolling plate, nitridation is finished synchronously, the temperature of normalization and nitridation is 1050-1150 DEG C, the atmosphere is 5-35% NH3 (volume percentage), and the balance of gas is N2; after the normalization and nitridation, the N content nitrided into the hot rolling plate is 60-250ppm; and normalization cooling is carried out, the initial temperature of fast cooling is 700-950 DEG C, and the fast cooling speed with the temperature of being reduced to 550 DEG C is 15-40 DEG C/sec. The production method solves the problem of difficult nitridation in the decarbonization procedure when a low-temperature plate blank heating technology is used for producing the high magnetic induction oriented silicon steel, carries out synchronous nitridation on the hot rolling plate in the normalization procedure, and leads the following procedure of decarbonization and annealing techniques to be simplified and easily controlled, thus not only being capable of obtaining a high magnetic induction oriented silicon steel product with excellent performance and simultaneously leading the production cost to be reduced.

Description

technical field [0001] The invention relates to a production method of high magnetic induction oriented silicon steel products, a low-cost production method of high magnetic induction oriented silicon steel, which is characterized in that the hot-rolled coils obtained by low-temperature slab heating (1100-1250 °C) technology are processed by Simultaneous nitriding is carried out in the normalization process, so that the decarburization annealing process in the subsequent process can be simplified and easy to control. While obtaining high magnetic induction oriented silicon steel products with excellent magnetic properties, the production cost is also greatly reduced. Background technique [0002] The production method of traditional high magnetic induction grain-oriented silicon steel is as follows: [0003] Use a converter (or electric furnace) to make steel, carry out secondary refining and alloying, and continuously cast into a slab. Its basic chemical composition is Si ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/00C22C38/06C21D8/12C23C8/26C21D1/26C21D1/68
Inventor 沈侃毅李国保徐琪吴培文杨勇杰靳伟忠胡卓超姜全力
Owner BAOSHAN IRON & STEEL CO LTD
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