Production method for copper-contained low-temperature high-magnetic-induction-oriented silicon steel

A technology of high magnetic induction orientation and production method is applied in the production field of copper-containing low temperature high magnetic induction oriented silicon steel, which can solve the problems of improving magnetic properties of grain boundary segregated elements, improve the degree of grain orientation, and prevent premature decomposition. , the effect of increasing the secondary recrystallization temperature

Active Publication Date: 2016-03-23
武汉钢铁有限公司
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Problems solved by technology

For example, Japanese Patent No.5-345921 reports a report on the production of high magnetic induction oriented silicon steel with AlN, MnS, CuS and Sn as inhibitor elements, and U.S. Patent US6364963B1 reports a kind of AlN / BN, MnS / MnSe and Sb as inhibitors Inhibitor elements have been reported to produce high magnetic induction oriented silicon steel. For general oriented silicon steel containing 0.5% Cu, there is no report on improving magnetic properties by adding the above-mentioned grain boundary segregation elements.

Method used

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  • Production method for copper-contained low-temperature high-magnetic-induction-oriented silicon steel

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Embodiment 1

[0017] The mass percent content of main elements in the silicon steel raw material composition is: C: 0.03%, Si: 3.0%, S: 0.001%, Als: 0.017%, N: 0.085%, Sn: 0.04%, Cu: 0.45%, and the rest are Fe and impurities are added to the steelmaking furnace, after steelmaking, hot rolling, pickling, primary cold rolling, intermediate decarburization annealing, secondary cold rolling, recovery annealing, MgO coating, high temperature annealing, coating and stretch leveling annealing Finally, the finished product is obtained, among which: the hot rolling temperature is 1250°C, the thickness of the first cold rolling is 0.65mm, the intermediate decarburization annealing temperature is 835°C, the carbon content is controlled at 10ppm, and the atmosphere in the heating section of the high temperature annealing process is N 2 :H 2 The ratio is 1:1, and the thickness of the finished product obtained after stretching, leveling and annealing is 0.269mm. Detect the magnetic induction intensity B...

Embodiment 2

[0019] The mass percent content of main elements in the silicon steel raw material composition is: C: 0.02%, Si: 3.15%, S: 0.002%, Als: 0.0175%, N: 0.098%, Sn: 0.05%, Cu: 0.50%, and the rest are Fe and impurities are added to the steelmaking furnace, after steelmaking, hot rolling, pickling, primary cold rolling, intermediate decarburization annealing, secondary cold rolling, recovery annealing, MgO coating, high temperature annealing, coating and stretch leveling annealing Finally, the finished product is obtained, wherein: the hot rolling temperature is 1280°C, the thickness of the first cold rolling is 0.68mm, the intermediate decarburization annealing temperature is 850°C, the carbon content is controlled at 10ppm, and the atmosphere in the heating section of the high temperature annealing process is N 2 :H 2 The ratio is 1:1, and the thickness of the finished product obtained after stretching and leveling annealing is 0.27mm. Detect the magnetic induction intensity B of ...

Embodiment 3

[0021] The mass percent content of the main elements in the silicon steel raw material composition is: C: 0.04%, Si: 3.3%, S: 0.003%, Als: 0.0185%, N: 0.010%, Sn: 0.046%, Cu: 0.50%, and the rest are Fe and impurities are added to the steelmaking furnace, after steelmaking, hot rolling, pickling, primary cold rolling, intermediate decarburization annealing, secondary cold rolling, recovery annealing, MgO coating, high temperature annealing, coating and stretch leveling annealing Finally, the finished product is obtained, wherein: the hot rolling temperature is 1300°C, the thickness of the first cold rolling is 0.70mm, the intermediate decarburization annealing temperature is 880°C, the carbon content is controlled at 20ppm, and the atmosphere in the heating section of the high temperature annealing process is N 2 :H 2 The ratio is 1:1, and the thickness of the finished product obtained after stretching, leveling and annealing is 0.29mm. The magnetic induction intensity B8 of t...

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Abstract

The invention relates to a production method for oriented silicon steel, in particular to a production method for copper-contained low-temperature high-magnetic-induction-oriented silicon steel. According to the production method, the content of Als and the content of N in raw material components are increased, AlN serves as a main inhibitor, due to the fact that the content of the Als and the content of the N are increased, on the one hand, the quantity of the inhibitor is increased and the inhibition force is enhanced, and on the other hand, the secondary recrystallization temperature is increased and the stability of secondary recrystallization is improved; Sn is added to the raw material components, so that the inhibition force is further enhanced, and due to the fact that the grain boundary co-segregation element Sn is added to the components, the content of the Sn is controlled between 0.04% to 0.06%, and through grain boundary co-segregation of the Sn, other grains provided with the size advantage and deviating from the Gausian orientation can be effectively prevented from growing abnormally, the grain orientation degree obtained after secondary recrystallization is improved, and magnetic induction is improved; a high-temperature annealing process is adjusted, the rate of N2 to H2 of the atmosphere in the temperature increase stage is adjusted to 1 to 1 from 1 to 3, and due to the fact that a great amount of the AlN is formed in the low-temperature temperature increase stage, the proportion of the N2 is increased, generation of the AlN is promoted, the AlN is prevented from being decomposed too early, and the phenomenon that a tail iron loss curve fluctuates due to the increase of the content of the Als in continuous production is avoided.

Description

technical field [0001] The invention relates to a production method of oriented silicon steel, in particular to a production method of copper-containing low-temperature high magnetic induction oriented silicon steel. Background technique [0002] Grain-oriented silicon steel is an important soft magnetic alloy, which is mainly used in the power electronics industry. As the core material of transformers, reactors and other equipment, it plays an important role in the national economy. The production method of oriented silicon steel is divided into high-temperature slab heating method and low-temperature slab heating method according to the hot rolling heating temperature, and the hot rolling heating temperature is above 1350°C and below 1300°C respectively. Both methods can produce high magnetic induction oriented silicon steel and general oriented silicon steel. The production method of high-temperature slab heating to produce general oriented silicon steel is gradually eli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/16C21D8/12C21D6/00C21D1/26C21D1/74
CPCC21D1/26C21D1/74C21D6/008C21D8/1222C21D8/1233C21D8/1244C21D8/1266C22C38/008C22C38/02C22C38/16
Inventor 朱业超程祥威骆忠汉方泽民李大明徐慧英柳志敏肖光润王常成党宁员
Owner 武汉钢铁有限公司
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