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A kind of manufacturing method of mirror-oriented silicon steel

A manufacturing method and technology for oriented silicon steel, applied in the field of steelmaking, can solve the problems of affecting the stability of secondary recrystallization and the effect of steel purification, uneven coating of annealing separators, complex coating processes, etc.

Active Publication Date: 2020-12-15
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned problems existing in the production of existing mirror-oriented silicon steel, the present invention adopts conventional annealing release agent MgO, which avoids problems such as uneven coating of annealing release agent and complex coating process, and does not add alkaline earth metal chlorides, oxides, etc. Additives, so as not to affect the secondary recrystallization stability and steel purification effect

Method used

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  • A kind of manufacturing method of mirror-oriented silicon steel
  • A kind of manufacturing method of mirror-oriented silicon steel
  • A kind of manufacturing method of mirror-oriented silicon steel

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Experimental program
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Embodiment 1

[0034] Such as figure 1 As shown, this embodiment provides a method for manufacturing mirror-oriented silicon steel, including:

[0035] Step S101: Smelting molten iron, adding one or more elements of Sb (antimony), Sn (tin), P (phosphorus), Cu (copper), and Bi (bismuth) during the smelting process, and the molten steel is refined And after pouring, a slab is obtained.

[0036] In the specific implementation process, when the molten iron is smelted, the molten iron can be put into a converter or an electric furnace for smelting, and the molten iron can be smelted through a converter or an electric furnace.

[0037] In the specific implementation process, when the slab is hot-rolled, the temperature at the end of rough rolling is controlled to not be lower than 1200°C (for example: 1200°C, 1250°C, 1300°C, etc.), and the temperature at the start of finish rolling is controlled to not be lower than 1000°C (eg: 1000°C, 1050°C, 1100°C, etc.).

[0038] Step S102: After the slab i...

Embodiment 2

[0055] Oriented silicon steel is smelted with a converter. The chemical composition (wt%) of the slab is: 0.072% C, 3.12% Si, 0.077% Mn, 0.022% S, 0.008% N, 0.145% Sn, 0.035% Cu, 0.0305% of Als, 0.025% of Cr, 0.016% of P, 0.022% of Sb, 0.0048% of Bi, etc., and the remaining components are Fe and unavoidable impurities.

[0056] After the slab is heated at 1370°C, it is hot-rolled into a hot-rolled sheet with a thickness of 2.3 mm. The hot-rolled sheet was annealed at 1125°C for 1.5 minutes, then pickled and cold-rolled to its final thickness. The cold-rolled sheet was decarburized and annealed at 840°C. . Without nitriding treatment, it is directly coated with conventional magnesia spacer and dried, then enters the ring furnace for high temperature annealing. The temperature was raised to 1190°C at a heating rate of 17°C / h and kept at 1190°C for 25 hours, and the hydrogen content in the protective atmosphere was 75%. After leaving the ring furnace, carry out stretching and ...

Embodiment 3

[0062] Oriented silicon steel is smelted with a converter. The composition and weight percentage of the slab are: C: 0.06% to 0.10%, Si: 2.9% to 3.3%, Mn: 0.05% to 0.10%, P: 0.01 to 0.055%, S: 0.01 ~0.03%, Als: 0.02%~0.035%, N: 0.007%~0.010%, Cr: 0.02%~0.4%, Sb: 0.005%~0.065%, Sn: 0.02%~0.2%, Cu: 0.03%~0.10 %, Bi: 0.001% to 0.03%, etc., and the rest are Fe and unavoidable impurities.

[0063] After the slab is heated at 1370°C, it is hot-rolled into a hot-rolled sheet with a thickness of 2.3mm. The hot-rolled sheet was annealed at 1125°C for 1.5 minutes, then pickled and cold-rolled to the final thickness. The cold-rolled sheet is decarburized and annealed at 840°C, and the reduction time after decarburization is 130 seconds. It is directly coated with conventional magnesium oxide release agent without nitriding treatment, and then enters the ring furnace for high-temperature annealing. The temperature was raised to 1190°C at a heating rate of 17°C / h and kept at 1190°C for 2...

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Abstract

The invention discloses a manufacturing method of mirror oriented silicon steel. The manufacturing method of the mirror oriented silicon steel comprises the steps that molten iron is smelted, one or more elements of Sb, Sn, P, Cu and Bi are added in the smelting process, and after the molten steel is refined and poured, a plate blank is obtained; after the plate blank is heated to 1320 DEG C-1400DEG C, the plate blank is hot-rolled, and a hot-rolled plate is prepared; the hot-rolled plate is normalized; the hot-rolled plate after being normalized is cold-rolled, and a cold-rolled plate is obtained; the cold-rolled plate is decarburized and annealed, during decarburizing and annealing, the carbon content in the cold-rolled plate is reduced to below 30ppm, meanwhile, a SiO2 oxide layer is formed on the surface of the cold-rolled plate, the oxygen adhering amount of the cold-rolled plate is controlled to be less than 500ppm, and the reduction time is controlled to be greater than 100 seconds; the decarburized and annealed cold-rolled plate is dried and annealed with magnesium oxide as an isolating agent; and the dried and annealed cold-rolled plate is heated to 1170-1250 DEG C at a preset heating rate for high temperature annealing.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for manufacturing mirror-oriented silicon steel. Background technique [0002] Oriented silicon steel is an essential energy-saving and consumption-reducing magnetic material in the electric power, electrician, and telecommunications industries. It is mainly used to manufacture various power transformers, distribution transformers, and large generator stators. [0003] After the traditional grain-oriented silicon steel has been hot-rolled, normalized and cold-rolled, it must be processed in H 2 -N 2 -H 2 Decarburization annealing is carried out under the protection of O atmosphere, and the carbon content in the steel strip is controlled below 30ppm to prevent magnetic aging of the finished plate. At the same time, decarburization annealing also eliminates the rolling stress generated by cold rolling and forms primary recrystallization. During decarburization anne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12C22C33/04C22C38/60C22C38/16
CPCC21D8/1222C21D8/1233C21D8/1244C21D8/1255C21D8/1283C22C33/04C22C38/002C22C38/008C22C38/16C22C38/60
Inventor 申明辉郭小龙杨佳欣高洋田文洲骆新根费东东张敬陈文聪蒋杰
Owner 武汉钢铁有限公司
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