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

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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
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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

Examples

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Example Embodiment

[0038] Example 1

[0039] The smelting composition using an intermediate frequency vacuum induction furnace is: C0.003%, Si0.7%, Mn0.2%, Al0.3%, the remainder is molten steel with Fe and inevitable impurities. The molten steel passes through a pair of reverse cooling effects. The rotating crystallizing roller directly casts a 1mm cast strip. The cast strip is water-cooled to 850°C for hot rolling, the hot rolling reduction is 30%, and the hot rolled strip is subsequently coiled at 630°C. The hot-rolled steel strip is cold-rolled with a reduction of 29%, then annealed at 860°C for 30s, and coated to obtain a 0.5mm thick non-oriented silicon steel sheet. Magnetic induction intensity B of the non-oriented silicon steel finished plate prepared by the invention 50 = 1.81T.

Example Embodiment

[0040] Example 2

[0041] The smelting composition using an intermediate frequency vacuum induction furnace is: C0.004%, Si1.0%, Mn0.3%, Al0.35%, the remainder is molten steel with Fe and inevitable impurities. The molten steel passes through a pair of opposite cooling effects. The rotating crystallizing roller directly casts a 2.5mm cast belt (refer to the macro texture of the cast belt) figure 2 Shown), the cast strip is hot-rolled by water cooling to 950°C (refer to the macro-texture map of the hot-rolled sheet image 3 Shown), the hot rolling reduction is 50%, and the hot rolled steel strip is subsequently coiled at 650°C. The hot-rolled strip is cold-rolled with a reduction of 60% (refer to the macro-texture map of the cold-rolled sheet) Figure 4 As shown), and then annealed at 890℃ for 30s (refer to the macro texture map of the annealed plate Figure 5 Shown) and coated to obtain a 0.5mm thick non-oriented silicon steel sheet. Magnetic induction intensity B of the non-or...

Example Embodiment

[0042] Example 3

[0043] The smelting composition using an intermediate frequency vacuum induction furnace is: C0.002%, Si1.4%, Mn0.39%, Al0.4%, the remainder is molten steel with Fe and inevitable impurities. The molten steel passes through a pair of reverse cooling effects. The rotating crystallizing roller directly casts a 1.8mm cast strip. The cast strip is water-cooled to 1050°C for hot rolling, the hot rolling reduction is 40%, and the hot rolled strip is subsequently coiled at 670°C. The hot-rolled steel strip is cold-rolled with a reduction of 53%, then annealed at 940°C for 30s, and coated to obtain a 0.5mm thick non-oriented silicon steel sheet. Magnetic induction intensity B of the non-oriented silicon steel finished plate prepared by the 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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