Baoshan Iron & Steel Co., Ltd.

Guobao Li

Kanyi Shen

Yongjie Yang

Meihong Wu

Zhuochao Hu

Huabing Zhang

Zipeng Zhao

Huande Sun

Yaming Ji

Shuangjie Chu

Guohua Yang

Baojun Liu

Bo Wang

Chen Ling

Wen Xiao

Jie Huang

Feng Zhang

Hongxu Hei

Dan Han

Weiyong Xie

Jun Zhang

Jun Li

Hai Liu

Xinqiang Zhang

Changsong Ma

Banglin Xiang

Weizhong Jin

Guanghua Cui

Bin Zhao

Yanli Song

Xiandong Liu

Pijun Zhang

Qi Xu

Peili Zhang

Yezhong Sun

Yueming Zhou

Jianguo Guo

Jianbing Chen

Changguo Huang

Xiaoli Jin

Dejun Su

Jianru Zhu

Yunpeng Xu

Dengfeng Li

Changjun Hou

Zhining Hu

Wangya Huang

Peiwen Wu

Quanli Jiang

Xijiang Lu

Jiaqiang Gao

Bingzhong Jin

Deyang Hu

Xing Mao

Wanqing Guo

Ningjiang Liu

Wenyue Zhang

Renbiao Zhang

Provided is a 600 MPa grade non-oriented electrical steel sheet with excellent magnetic properties, comprising the following chemical elements in mass percentage: 0<C≤0.0035%; Si: 2.0-3.5%; Mn: 0.4-1.2%; P: 0.03-0.2%; Al: 0.4-2.0%; and the balance being Fe and unavoidable impurities. Also provided is a manufacturing method for the 600 MPa grade non-oriented electrical steel as described above, including the following steps: (1) converter smelting, RH refining and casting; (2) hot rolling; (3) normalizing; (4) cold rolling; (5) continuous annealing; and (6) applying an insulation coating to obtain a finished non-oriented electrical steel sheet.

600 MPa grade non-oriented electrical steel sheet and manufacturing method thereof

The present invention discloses a Cu-containing non-oriented electrical steel plate having high cleanliness, comprising the following chemical elements in percentage by mass: 0<C≤0.003%; Si: 0.1-2.0%; Mn: 0.1-0.55%; S: 0-0.004%; Cu: 0.003-0.2%; Al: 0.1-1.0%; and the balance being Fe and inevitable impurities. In addition, the present invention further discloses a continuous annealing process for the Cu-containing non-oriented electrical steel plate having high cleanliness. Moreover, the present invention further discloses a manufacturing method for Cu-containing non-oriented electrical steel plate having high cleanliness, including the steps of: smelting and casting; hot rolling; normalizing; cold rolling; performing the continuous annealing process; and applying an insulation coating to obtain a finished non-oriented electrical steel plate. The Cu-containing non-oriented electrical steel plate having high-cleanliness is high in cleanliness and excellent in magnetic performance.

Cu-containing non-oriented electrical steel sheet and manufacturing method therefor

An induction heating system for a silicon steel core with a self-adhesive coating that includes an induction heating device having a columnar induction heating coil with a hollow cavity that carries out induction heating on a silicon steel plate at a medium frequency of 6-20 KHz. By rapid induction heating at a medium frequency, a silicon steel core with a self-adhesive coating can be rapidly cured, thereby greatly shortening the processing time, improving production efficiency, and facilitating automated operation in the production of a silicon steel core with a self-adhesive coating. The system also ensures the quality of the cured core products that can be widely applied in the field of the production of silicon steel cores with a self-adhesive coating.

Induction heating system and method for silicon steel core with self-adhesive coating

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

An oriented silicon steel product with a low iron loss for a low-noise transformer, and manufacturing method thereof are provided. The oriented silicon steel product comprises: a silicon steel substrate, a magnesium silicate bottom layer formed on a surface of the silicon steel substrate, and an insulation coating applied on the magnesium silicate bottom layer. The magnesium silicate bottom layer has a visible light normal reflectivity (R) of 40-60% for. By strictly controlling the visible light normal reflectivity of the magnesium silicate bottom layer of the silicon steel substrate and the evenness of the gloss of magnesium silicate bottom layer, lower iron loss, and reduced magnetostriction can be achieved, and thus a silicon steel product with low noise and particularly suitable for transformers can be obtained.

Silicon steel product with low iron loss for low-noise transformer, and manufacturing method thereof

Disclosed is a manufacturing method for a high silicon grain oriented electrical steel sheet, the silicon content of the high silicon grain oriented electrical steel is greater than 4 wt %, comprising the steps of: (1) performing decarburization annealing of a cold-rolled steel plate; (2) allowing high silicon alloy particles in a completely solid state to collide at a high speed with the surface of the decarburization annealed steel plate to be sprayed, thus forming a high silicon alloy coating on the surface of the steel plate to be sprayed; (3) coating a release agent and drying; and (4) annealing. The manufacturing method for the high silicon grain oriented electrical steel sheet of the present invention is inexpensive, and, the high silicon grain oriented electrical steel sheet produced is of stable quality and is provided with great magnetic performance.

Manufacturing method for high silicon grain oriented electrical steel sheet

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

An apparatus and a method for rapidly heating cold-rolled strip steel (). The apparatus for rapidly heating cold-rolled strip steel () comprises a heating zone, a soaking zone, and a cooling zone, and the heating zone is sequentially divided into a first heating section (), a second heating section (), a third heating section (), and a fourth heating section () along a moving direction of the strip steel () to be heated, the first heating section () and the fourth heating section () being radiant heating sections, and the second heating section () and the third heating section () being inductive heating sections. The method for rapidly heating cold-rolled strip steel () uses the apparatus for rapidly heating cold-rolled strip steel () to heat the strip steel ().

Apparatus and method for rapidly heating cold-rolled strip 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 manufacturing method of oriented silicon steel with magnetic induction B8 of not less than 1.88 T, comprising the following steps: 1) smelting and continuous casting to obtain a slab, wherein the content of N is controlled at 0.002-0.014 wt % in the smelting stage; 2) hot-rolling; 3) cold-rolling; 4) decarbonizing and annealing; 5) nitriding treatment, wherein infiltrated nitrogen content [N]is controlled to satisfy the formula: 328&#x2212;0.14a&#x2212;0.85b&#x2212;2.33c&#x2266;[N]&#x2266;362&#x2212;0.16a&#x2212;0.94b&#x2212;2.57c, wherein a is the content of Als in the smelting step, with the unit of ppm; b is the content of N element, with the unit of ppm; and c is primary grains size, with the unit of &#x3bc;m; 6) coating a steel's surfaces with a magnesium oxide layer and annealing; and 7) applying an insulating coating.

Manufacturing method of common grain-oriented silicon steel with high magnetic induction

A fast-speed laser scoring method is provided, in which a set of related laser scoring device is used to simultaneously score lines on the upper surface and the lower surface of an oriented silicon steel strip, which is being fed and traveling forwards on a production line, with high-focalized continuous wave laser beam; the lines scored on the upper surface and the lines scored on the lower surface have the same space between every two adjacent scored lines but are staggered each other in order to reduce iron loss evenly. The space between every two adjacent scored lines on the same surface is 6-12 mm, laser power is 1000-3000 W and scanning speed is 100-400 m/min. The machining rate of the scoring method and device attains 1.5-2 times the one of conventional scoring methods which can not simultaneously score the upper and lower surfaces of a steel strip at a time. The lines scored on a steel strip by the method can reduce iron loss of the strip by 10-16%.

Fast-speed laser scoring method

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

Guobao Li