Production of non-directional cold-rolling silicon steel disc

A production method and technology of silicon steel sheets, applied in the field of metallurgy, can solve problems such as high cost and harsh raw material requirements, and achieve the effects of reducing impact, reducing production costs, and solving raw material problems

Inactive Publication Date: 2009-04-15
上海申群物资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of production method of non-oriented cold-rolled silicon steel sheet, the production method of this non-oriented cold-rolled silicon steel sheet of the present invention will solve the cold-rolled silicon steel sheet production process in the prior art to raw material requirement very harsh, Cost-prohibitive technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1. The raw material of non-oriented silicon steel

[0020] Through repeated experiments, the inventors determined the chemical composition of the non-oriented silicon steel raw material. The determination principles are: a) not only meet the performance requirements of the finished product, but also reduce the cost of smelting; b) relax the control of some harmful elements in silicon steel, and at the same time reduce the impact of these elements on the final performance of silicon steel through corresponding measures; c) corresponding Increase the content of silicon to reduce iron loss.

[0021] The influence of main elements on the performance of silicon steel is as follows:

[0022] Silicon (Si): Silicon mainly increases resistivity, reduces eddy current loss, and at the same time reduces coercive force and hysteresis loss, thereby reducing iron loss. But the magnetic induction and saturation magnetic induction are also reduced. As the silicon content i...

Embodiment 2

[0031] Embodiment 2. Production of non-oriented cold-rolled silicon steel strip

[0032] The invention discloses a method for producing non-oriented cold-rolled silicon steel sheets, which includes a process of cold-rolling silicon steel strips by using a cold rolling mill. Due to the presence of coarser MnS, AlN, etc. in the non-oriented silicon steel slab. If the heating temperature is too high, they will dissolve in the steel. In the subsequent hot rolling process, the solid solubility decreases with the decrease of temperature. As a result, it precipitates in a fine and dispersed form, which hinders the growth of grains during subsequent annealing and deteriorates the magnetic properties. Therefore, before the process of cold-rolling the silicon steel strip by using the cold rolling mill is implemented, a pretreatment process is performed on the hot-rolled silicon steel billet.

[0033] The pretreatment process of this embodiment includes a hot rolling step, a normalizin...

Embodiment 3

[0053] Embodiment 3. performance detection of silicon steel strip

[0054] The inventor ordered 102 tons of 244*2.5 silicon steel hot strip raw materials from Wuxi Huaye Iron and Steel Company in March 2005, and then produced 244*0.5 silicon steel strips according to the process described in Example 2. After testing: iron loss P15 / 50 = 5.22W / KG; magnetic induction B50 = 1.17T; performance fully meets the requirements of cold-rolled silicon steel sheet 50W540.

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Abstract

Production of non-orientated cold-rolling silicon steel sheet is carried out hot milling, conventionally treating, acid washing, primary cold rolling, intermediate annealing, secondary cold rolling and product annealing. It costs low and has better quality, and it can decrease rolling force and has less harmful elements. It can be used to produce medium and small electric motor.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to the production technology of cold-rolled silicon steel, in particular to a production method of non-oriented cold-rolled silicon steel sheet. Background technique [0002] Silicon steel sheet or silicon steel strip is an extremely low-carbon steel plate with a silicon mass fraction of 0.5 to 5%, mainly used in the motor industry (the silicon mass fraction is normally below 2.5%; the thickness is generally 0.5MM) and the transformer industry (silicon mass fraction The fraction is normally below 2.5% to 5%; the thickness is generally 0.35MM). The development of silicon steel has gone through three main stages: hot-rolled silicon steel, cold-rolled silicon steel, and high magnetic induction oriented silicon steel. [0003] In 1903, the United States and Germany first produced hot-rolled silicon steel sheets, and the American Armco Steel Company began to produce cold-rolled silicon steel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D11/00B21B37/74C22C38/02C23G1/08
CPCC23G1/08C22C38/02C22C38/04
Inventor 李秉群顾斌陈晓瞿忠德
Owner 上海申群物资有限公司
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