Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof

A technology of oriented electrical steel, continuous casting and rolling, which is applied in the field of non-oriented electrical steel, can solve the problems that the thin slab continuous casting and rolling process is difficult to realize, cannot completely eliminate coarse columnar crystals, and cannot reflect cost advantages, etc., and achieves improvement Market competitiveness, reasonable design, excellent steel plate magnetic effect

Active Publication Date: 2010-12-08
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

[0005] 1. Increase the carbon content in the molten steel to expand the γ phase region and the α+γ two-phase region. If C≥[(Si+Al)-0.75]%/100, the billet undergoes phase transformation during hot rolling, making the coarse Columnar grain refinement, the disadvantage is that deep decarburization is required in the recrystallization process of the finished product, which affects the running speed of the steel strip
However, the continuous casting and rolling of thin slabs cannot completely eliminate the coarse columnar grains through phase transformation

Method used

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  • Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof
  • Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof
  • Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The chemical composition and weight percentage of non-oriented electrical steel produced by continuous casting and rolling of thin plates are: C: 0.0031%, Si: 1.0%, Al: 0.50%, Si+2Al: 2.0%, Mn: 0.5%, P: 0.10%, S: 0.0072%, N: 0.0048%, Ti: 0.006%, Ca: 0.01%, Cu: 0.3%, Ni: 0.08%, and the rest are iron and unavoidable impurities.

[0029] The production right adopts the method of non-oriented electrical steel produced by continuous casting and rolling of thin plates, the steps of which are as follows:

[0030] 1) Smelting and vacuum treatment;

[0031] 2) Carry out continuous casting, control the thickness of the cast slab at 50 mm, and control the casting speed at 3 m / min;

[0032] 3) Perform soaking, control the temperature of the slab before entering the furnace at 850-855°C, and control the soaking temperature at 1080-1085°C;

[0033] 4) Carry out finish rolling, control the reduction rate of each pass in the first two passes to 50%, and control the finish rolling tem...

Embodiment 2

[0040] The chemical composition and weight percentage of non-oriented electrical steel produced by continuous casting and rolling of thin plates are: C: 0.0045%, Si: 1.25%, Al: 0.25%, Si+2Al: 1.75%, Mn: 0.85%, P: 0.075%, S: 0.008%, N: 0.0042%, Ti: 0.008%, Ca: 0.0093%, Cu: 0.45%, and the rest are iron and unavoidable impurities.

[0041] The production right adopts the method of non-oriented electrical steel produced by continuous casting and rolling of thin plates, the steps of which are as follows:

[0042] 1) Smelting and vacuum treatment;

[0043] 2) Carry out continuous casting, control the thickness of the cast slab at 60 mm, and control the casting speed at 3.5 m / min;

[0044] 3) Perform soaking, control the temperature of the slab before entering the furnace at 860-865°C, and control the soaking temperature at 1080-1085°C;

[0045] 4) Carry out finish rolling, control the reduction rate of each pass in the first two passes to 58%, and control the finish rolling temper...

Embodiment 3

[0052] The chemical composition and weight percentage of non-oriented electrical steel produced by thin plate continuous casting and rolling are: C: 0.0038%, Si: 1.6%, Al: 0.25%, Si+2Al: 2.1%, Mn: 0.90%, P: 0.095%, S: 0.068%, N: 0.0038%, Ti: 0.0068%, Ca: 0.008%, Ni: 0.3%, and the rest are iron and unavoidable impurities.

[0053] The production right adopts the method of non-oriented electrical steel produced by continuous casting and rolling of thin plates, the steps of which are as follows:

[0054] 1) Smelting and vacuum treatment;

[0055] 2) Carry out continuous casting, control the thickness of the cast slab at 65 mm, and control the casting speed at 3.5 m / min;

[0056] 3) Perform soaking, control the temperature of the slab before entering the furnace at 900-904°C, and control the soaking temperature at 1090-1098°C;

[0057] 4) Carry out finish rolling, control the reduction rate of each pass in the first two passes to 60%, and control the finish rolling temperature t...

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Abstract

The invention relates to non-oriented electrical steel produced by sheet continuous casting and rolling and a method thereof. The steel contains the following components by in percentage of by weight: 0.0031%-0.01% of C, 1.0-1.7% of Si, 1.0-2.4% of Si+2Al, at mostnot less than 0.5% of Al, 0.5-1.5% of Mn, not less thanat most 0.10% of P, not less thanat most 0.008% of S, not less thanat most 0.005% of N, not less thanat most 0.008% of Ti, and not less thanat most 0.010% of Ca, wherein Si+2Al is 1.0-2.4%. The method comprises the following steps of: smelting and treating by in vacuum; continuously casting, and controlling the thickness of a casting blank to be thickness within 50-90mm; soaking, controlling the temperature of the casting blank to be 850-950 DEG C before entering the furnace; finish rolling; coiling at the temperature of 690-780 DEG C; prickling; cold rolling; decarburizing, and controlling at the temperature to of 800-920 DEG C; and coating or not coating as required by users. The invention has no need of additionally arranging equipment and the normalizing and secondary cold rolling of hot rolled plates, the magnetism of the steel plate is good, and the corrugated defect is not found in test.

Description

technical field [0001] The invention relates to a non-oriented electrical steel and a production method thereof, in particular to non-oriented electrical steel produced by continuous casting and rolling of thin plates and a method thereof. Background technique [0002] The production process of thin slab continuous casting and rolling is short, the casting billet is thin, and the heat loss in the process is small, which can save a lot of energy and reduce costs. In addition, thin slab continuous casting and rolling can realize high-temperature final rolling and high-temperature coiling, which are difficult to achieve in traditional processes, and produce non-oriented electrical steel with excellent magnetic properties. [0003] The non-oriented electrical steel slab produced by thin slab continuous casting and rolling is thin, with fast casting speed and well-developed columnar crystals. In addition, compared with the traditional process, the production of non-oriented elec...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/16
Inventor 欧阳页先骆忠汉吴健鹏柳志敏黄璞祝晓波王春峰张永锟叶九美刘良田李大明冯大军
Owner 武汉钢铁有限公司
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