Baoshan Iron & Steel Co., Ltd.

Meihong Wu

Guobao Li

Yongjie Yang

Kanyi Shen

Zipeng Zhao

Zhuochao Hu

Yaming Ji

Huabing Zhang

Huande Sun

Changsong Ma

Shuangjie Chu

Guohua Yang

Chen Ling

Weiyong Xie

Jianguo Guo

Jun Zhang

Jie Huang

Hai Liu

Hongxu Hei

Aihua Ma

Xiandong Liu

Dejun Su

Weizhong Jin

Xijiang Lu

Jiaqiang Gao

Deyang Hu

A grain-oriented silicon steel with low iron loss, wherein the silicon steel is provided with a plurality of grooves on its surface, each of the grooves is 10-60 &#x3bc;m in width and 5-40 &#x3bc;m in depth, and the spacing between adjacent grooves is 1-10 mm. The manufacturing method therefor comprises: scoring the surface of the grain-oriented silicon steel with low iron loss by using a laser in order to form the grooves. The grain-oriented silicon steel with low iron loss can maintain the magnetic domain refining effect in a stress-relief annealing process, and avoid the introduction of more residual stress.

Grain-oriented silicon steel with low core loss and manufacturing method therefore

A heat-resistant magnetic domain refined grain-oriented silicon steel, a single-sided surface or a double-sided surface of which has several parallel grooves which are formed in a grooving manner, each groove extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel, and the several parallel grooves are uniformly distributed along the rolling direction of the heat-resistant magnetic domain refined grain-oriented silicon steel. Each groove which extends in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel is formed by splicing several sub-grooves which extend in the width direction of the heat-resistant magnetic domain refined grain-oriented silicon steel. The manufacturing method for a heat-resistant magnetic domain refined grain-oriented silicon steel comprises the step of: forming grooves on a single-sided surface or a double-sided surface of a heat-resistant magnetic domain refined grain-oriented silicon steel in a laser grooving manner, a laser beam of the laser grooving is divided into several sub-beams by a beam splitter, and the several sub-beams form the several sub-grooves which are spliced into the same groove.

Grain-oriented silicon steel having heat-resistant magnetic domain and manufacturing method thereof

Disclosed is a method for manufacturing stress-relief-annealing-resistant, low-iron-loss grain-oriented silicon steel, the method comprising: carrying out, by means of a pulse laser, scanning grooving on a single surface or two surfaces of a silicon steel sheet after cold rolling, or after decarburizing annealing, or after high temperature annealing or after hot stretching, temper rolling and annealing, and forming several grooves parallel with each other in a rolling direction of the silicon steel sheet, wherein a single pulse time width of the pulse laser is 100 ns or less, and a single pulse peak energy density is 0.05 J/cmor more; the energy density of a single scan of a single laser beam is 1 J/cmto 100 J/cm; a beam spot of the pulse laser is a single beam spot or a combination of a plurality of beams spots, the shape of the beam spot is circular or elliptic, and the diameter of the beam spot in a scanning direction is 5 &#x3bc;m to 1 mm, and the diameter thereof in a direction perpendicular to the scanning direction is 5 &#x3bc;m to 300 &#x3bc;m; and when scanning grooving is carried out at the same position on the silicon steel sheet, the product of the number of beam spots of the pulse laser and the scan times is 5 or more.

Method for manufacturing stress-relief-annealing-resistant, low-iron-loss grain-oriented silicon steel

A laser-scribed grain-oriented silicon steel resistant to stress-relief annealing and a manufacturing method therefor. Parallel linear grooves () are formed on one or both sides of grain-oriented silicon steel () by laser etching. The linear grooves () are perpendicular to, or at an angle to, the rolling direction of the steel plate. A maximum height of edge protrusions of the linear grooves () does not exceed 5 &#x3bc;m, and a maximum height of spatters in etch-free regions between adjacent linear grooves () does not exceed 5 &#x3bc;m, and the proportion of an area occupied by spatters in the vicinity of the linear grooves () does not exceed 5%. The steel has low manufacturing costs, and the etching effect of the finished steel is retained during a stress-relief annealing process. The steel is suitable for manufacturing of wound iron core transformers.

Laser-scribed grain-oriented silicon steel resistant to stress-relief annealing and manufacturing method therefor

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

The invention relates to high magnetic induction oriented silicon steel and a preparation method thereof. The oriented silicon steel comprises the following chemical elements by weight percent: 0.035-0.120% of C, 2.9-4.5% of Si, 0.05-0.20% of Mn, 0.005-0.050% of P, 0.005-0.012% of S, 0.015-0.035% of Als, 0.001-0.010% of N, 0.05-0.30% of Cr, 0.005-0.090% of Sn, not more than 0.0100% of V, not more than 0.0100% of Ti, at least one of trace elements of Sb, Bi, Nb and Mo, and the balance of Fe and other inevitable impurities, wherein Sb+Bi+Nb+Mo is 0.0015-0.0250% and (Sb/121.8+Bi/209.0+Nb/92.9+Mo/95.9)/(Ti/47.9+V/50.9) ranges from 0.1 to 15.

High magnetic induction oriented silicon steel and manufacturing method thereof

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

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Shanghai, China

Meihong Wu