Baoshan Iron & Steel Co., Ltd.

Dejun Su

Hongxu Hei

Jun Yang

Xiao Ling Chen

Jun Zhang

Hai Liu

Guobao Li

Yongjie Yang

Kanyi Shen

Xiandong Liu

Runjie Lin

Shishu Xie

Meihong Wu

Zhuochao Hu

Guohua Yang

Huande Sun

Qi Xu

Peili Zhang

Weizhong Jin

Rongqiang Jiang

Miao Ye

Minghua Shen

Hongbing Wang

Huaqun Zhu

Xuechang You

Guiling Zhou

Bingzhong Jin

Renbiao Zhang

Xiao Chen

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. A normalizing furnace is used in the normalizing step, and along a moving direction of strip steel, the normalizing furnace sequentially comprises: a preheating section, a nonoxidizing heating section, a furnace throat, furnace sections for subsequent normalizing processing, and a delivery seal chamber. Furnace pressures of the normalizing furnace are distributed as follows: the furnace pressure of a downstream furnace section adjacent to the furnace throat along the moving direction of the strip steel is the highest, the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an inlet direction of the normalizing furnace, and the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an outlet direction of the normalizing furnace.

Method for producing silicon steel normalizing substrate

A cold-rolling method for preventing fracture of high-silicon strip steel, characterized in that the high-silicon strip steel has a Si content &#x2267;2.3 wt %, and at the beginning of cold-rolling, the temperature of inlet strip steel is above 45&#xb0; C.; during the cold-rolling process, an emulsion liquid is sputtered to the strip steel, a flow rate of the emulsion liquid is 3500 L/min at the inlet in rolling direction, a flow rate of the emulsion liquid is 1500-4000 L/min at an outlet in the rolling direction, and the temperature of the strip steel is maintained above 45&#xb0; C. under the precondition to guarantee technological lubrication. The cold-rolling method of the invention might prevent fracture of a head portion and a tail portion of the strip steel, raise the rate of finished products, and increase production efficiency.

Cold-rolling method for preventing fracture of high-silicon strip steel

Growing community of inventors

Shanghai, China

Dejun Su