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Manufacturing method of thin-strip continuous casting high magnetic induction non-oriented silicon steel

A technology of oriented silicon steel and manufacturing method, which is applied in the field of metal material processing, can solve problems such as the difficulty in producing thin-gauge cold-rolled products, and achieve the effects of low production cost, improved surface quality, and increased magnetic induction intensity

Active Publication Date: 2015-07-08
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the cast strip in this invention patent is at most 120% of the thickness of the finished product, so it is difficult to produce thin-gauge cold-rolled products
[0009] In summary, the above technical solutions are still insufficient in the production of high magnetic induction non-oriented silicon steel and thin-gauge non-oriented silicon steel

Method used

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  • Manufacturing method of thin-strip continuous casting high magnetic induction non-oriented silicon steel
  • Manufacturing method of thin-strip continuous casting high magnetic induction non-oriented silicon steel
  • Manufacturing method of thin-strip continuous casting high magnetic induction non-oriented silicon steel

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Embodiment 1

[0039] Use medium frequency vacuum induction furnace to smelt molten steel whose composition is: C0.003%, Si0.7%, Mn0.2%, Al0.3%, and the balance is Fe and unavoidable impurities. The rotating crystallization roll directly casts a 1mm cast strip. The cast strip is cooled to 850°C for hot rolling, and the hot rolling reduction is 30%. The hot rolled strip is then coiled at 630°C. The hot-rolled steel strip was cold-rolled with a reduction of 29%, then annealed at 860° C. for 30 seconds, and coated to obtain a 0.5 mm thick non-oriented silicon steel sheet. The magnetic induction intensity B of the non-oriented silicon steel finished plate prepared by the present invention 50 =1.81T.

Embodiment 2

[0041] Use medium frequency vacuum induction furnace to smelt molten steel whose composition is: C0.004%, Si1.0%, Mn0.3%, Al0.35%, and the balance is Fe and unavoidable impurities. The rotating crystallization roll directly casts a 2.5mm cast strip (the macroscopic texture diagram of the cast strip can be referred to figure 2 shown), the cast strip was hot-rolled by water cooling to 950°C (see image 3 shown), the hot rolling reduction is 50%, and the hot rolled strip is then coiled at 650°C. The hot-rolled steel strip is cold-rolled with a reduction of 60% (the macro-texture diagram of the cold-rolled plate can be referred to as Figure 4 shown), followed by annealing at 890°C for 30s (see Figure 5 Shown), and coated to obtain 0.5mm thick non-oriented silicon steel plate. The magnetic induction intensity B of the non-oriented silicon steel finished plate prepared by the present invention 50 =1.83T.

Embodiment 3

[0043] Use medium frequency vacuum induction furnace to smelt molten steel whose composition is: C0.002%, Si1.4%, Mn0.39%, Al0.4%, and the balance is Fe and unavoidable impurities. A 1.8mm cast strip is directly cast from the rotating crystallization roll, and the cast strip is cooled to 1050°C for hot rolling with a hot rolling reduction of 40%, and the hot rolled strip is then coiled at 670°C. The hot-rolled steel strip was cold-rolled with a reduction of 53%, then annealed at 940° C. for 30 seconds, and coated to obtain a non-oriented silicon steel sheet with a thickness of 0.5 mm. The magnetic induction intensity B of the non-oriented silicon steel finished plate prepared by the present invention 50 =1.82T.

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Abstract

The application discloses a manufacturing method of thin-strip continuous casting high magnetic induction non-oriented silicon steel. The manufacturing method comprises the following steps: (1) smelting molten steel and performing thin-strip continuous casting to obtain a cast strip, wherein the degree of superheat for thin-strip continuous casting is 30-55 DEG C; (2) cooling the cast strip and directly performing hot rolling and coiling to obtain hot-rolled strip steel, wherein the hot-rolling reduction is 30%-50%; (3) performing cold rolling with the reduction of not more than 60% on the hot-rolled strip steel; and (4) performing annealing treatment to obtain a non-oriented silicon steel finished plate. The manufacturing method disclosed by the invention has the advantages of short process flow, low production cost and obvious energy-saving and emission-reducing effects. By eliminating an abnormally coarse columnar crystal structure through the appropriate hot-rolling reduction, a corrugated defect of a cold-rolled product is avoided; meanwhile, (100) plane texture in an as-cast microstructure is inherited; the cold-rolling reduction is reduced, so that the formation of cold-rolled (111) texture is avoided, the proportion of annealing plate (100) texture is increased, a high magnetic induction non-oriented silicon steel product is obtained, and the magnetic induction of the high magnetic induction non-oriented silicon steel is above 1.81T.

Description

technical field [0001] The invention belongs to the field of metal material processing, in particular to a method for manufacturing thin strip continuous casting high magnetic induction non-oriented silicon steel. Background technique [0002] Silicon steel has special and excellent magnetic properties and can be divided into oriented silicon steel and non-oriented silicon steel. Among them, non-oriented silicon steel is mainly used in various types of motors and compressors. In order to reduce the energy loss when the motor is working, it is necessary to continuously improve the magnetic properties of the non-oriented silicon steel, and increase the magnetic induction of the silicon steel while reducing the iron loss. [0003] At present, the production of non-oriented silicon steel mainly adopts the traditional technology of thick slab continuous casting and rolling + cold rolling and annealing technology. Due to the large hot rolling reduction and large cold rolling red...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/04C21D8/12
CPCC21D8/1222C22C38/02C22C38/04C22C38/06
Inventor 汤茜陈爱华刘海涛李化龙
Owner SHAGANG GROUP
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