Baoshan Iron & Steel Co., Ltd.

Weizhong Jin

Jie Huang

Hai Liu

Guobao Li

Kanyi Shen

Yongjie Yang

Meihong Wu

Zhuochao Hu

Guohua Yang

Pijun Zhang

Huande Sun

Qi Xu

Dejun Su

Quanli Jiang

Bingzhong Jin

Deyang Hu

Peiwen Wu

Renbiao Zhang

A method for detecting electromagnetic property of oriented silicon steel, the method comprises: measuring Euler angles of each of crystal grains in a specimen by use of metallographic etch-pit method; calculating orientation deviation angle &#x3b8;(degree) of the crystal grain; combining area Si (mm) of the crystal grain and correction coefficient X of element Si (X=0.1&#x2dc;10 T/degree); correcting on the basis of the magnetic property B(saturation magnetic induction, T) of single-crystal material by using these parameters (&#x3b8;, S, X), formula for correcting is 

Method for detecting electromagnetic property of oriented silicon steel

The invention provides a method for producing grain-oriented silicon steel with single cold rolling, comprising: 1) smelting, refining and continuous casting to obtain a casting blank; 2) hot rolling; 3) normalization, i.e. normalizing annealing and cooling; 4) cold-rolling, i.e. single cold rolling at a cold rolling reduction rate of 75-92%; 5) decarburizing annealing at 780-880&#xb0; C. for 80-350 s in a protective atmosphere having a due point of 40-80&#xb0; C., wherein the total oxygen [O] in the surface of the decarburized sheet: 171/t&#x2266;[O]&#x2266;313/t (t represents the actual thickness of the steel sheet in mm), the amount of absorbed nitrogen: 2-10 ppm; 6) high temperature annealing, wherein the dew point of the protective atmosphere: 0-50&#xb0; C., the temperature holding time at the first stage: 6-30 h, the amount of absorbed nitrogen during high-temperature annealing: 10-40 ppm; 7) hot-leveling annealing. The invention may control the primary recrystallization microstructure of steel sheet effectively by controlling the normalization process of hot rolled sheet to form sufficient favorable (Al, Si)N inclusions from nitrogen absorbed by slab during decarburizing annealing and low-temperature holding of high-temperature annealing, facilitating the generation of stable, perfect secondary recrystallization microstructure of the final products. In addition, the invention avoids the impact of nitridation using ammonia on the underlying layer in prior art, and thus the formation of a good glass film underlying layer is favored.

Method for manufacturing grain-oriented silicon steel with single cold rolling

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Shanghai, China

Weizhong Jin