Baoshan Iron & Steel Co., Ltd.

Guohua Yang

Guobao Li

Huande Sun

Hongxu Hei

Yongjie Yang

Xiandong Liu

Meihong Wu

Yaming Ji

Jun Zhang

Jie Huang

Xiaolin Li

Bo Wang

Kanyi Shen

Shishu Xie

Huawei Zhang

Aihua Ma

Liang Zou

Zhuochao Hu

Changguo Huang

Dejun Su

Weizhong Jin

Yunpeng Xu

Deyang Hu

The invention discloses an oriented silicon steel with excellent magnetic properties and a manufacturing method thereof. The present invention obtains the oriented silicon steel with excellent magnetic properties by controlling the area ratio of small crystal grains of D&#x3c;5 mm in an oriented silicon steel finished product to be not more than 3%, and controlling the ratio &#x3bc;17/&#x3bc;15 of the magnetic conductivity under the magnetic induction of 1.7 T and 1.5 T in the oriented silicon steel finished product to be 0.50 or more. In addition, by using a slab of the oriented silicon steel with suitable components and an optimized cold rolling step, the present invention effectively decreases the heating temperature of the slab and the production cost thereof, and simultaneously better controls the size and ratio of the crystal grains in the oriented silicon steel finished product and the magnetic conductivity in a certain range of magnetic induction, ensures that secondary recrystallization has good Goss texture orientation and finally, stably obtains the oriented silicon steel product with excellent magnetic properties.

Oriented silicon steel and method for manufacturing same

A method for producing a silicon steel normalizing substrate comprises: steelmaking, hot rolling and normalizing steps. The normalizing step uses a normalizing furnace having a nonoxidizing heating furnace section. The nonoxidizing heating furnace section comprises more than 3 furnace zones. An energy investment ratio of the furnace zones used in the nonoxidizing heating furnace section is adjusted, so as to control an excess coefficient &#x3b1; of the nonoxidizing heating furnace section to be within a range of 0.8&#x2266;&#x3b1;&#x3c;1.0.

Method for producing silicon steel normalizing substrate

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

A manufacturing method of oriented Si steel with high electric-magnetic property comprises the following steps: smelting steel in converter or electric furnace; refining molten steel in two stages; continuous casting to obtain slab; hot rolling; first cold rolling; decarburizing annealing; secondary cold rolling; applying an annealing separator based on MgO and annealing at high temperature; applying an insulating coating and leveling tension annealing. The slab comprises (in wt %): C 0.020-0.050%, Si 2.6-3.6%, S 0.015-0.025%, Als 0.008-0.028%, N 0.005-0.020%, Mn 0.15-0.5%, Cu 0.3-1.2%, balance Fe and inevitable impurities, in which 10&#x2266;Mn/S&#x2266;20 and Cu/Mn&#x2267;2. The method could produce oriented Si steel with high magnetic induction intensity and low iron loss at low cost.

Manufacturing method of oriented SI steel with high electric-magnetic property

A method of manufacturing oriented Si steel containing Cu with high electric-magnetic property comprises: hot rolling slab; after first cold rolling, heating it to 800&#xb0; C. or higher temperature and performing intermediate decarburization annealing in a protective atmosphere with P/Pof 0.50&#x2dc;0.88 for 3-8 minutes, to decrease carbon content of the steel plate to less than 30 ppm; then peening and acid-pickling to remove oxide of Fe on surface and to control oxygen content to lower than 500 ppm; secondary cold rolling to final thickness and coating separation agent in water-slurry form; drying to decrease water content to lower than 1.5%; high-temperature annealing in a protective atmosphere containing hydrogen with oxidation degree (P/P) of 0.0001-0.2; finally applying a tension coating and leveling tension annealing.

Method for producing grain-oriented silicon steel containing copper

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Shanghai, China

Guohua Yang