Baoshan Iron & Steel Co., Ltd.

Zipeng Zhao

Guobao Li

Yongjie Yang

Meihong Wu

Yaming Ji

Kanyi Shen

Huabing Zhang

Chen Ling

Weiyong Xie

Changsong Ma

Zhuochao Hu

Shuangjie Chu

Jianguo Guo

Xiao Ling Chen

Jie Huang

Hai Liu

Yanli Song

Aihua Ma

Dan Han

Huande Sun

Baojun Liu

Xinqiang Zhang

Jianbing Chen

Lingyun Chen

Wen Xiao

Banglin Xiang

Yunpeng Xu

Dengfeng Li

Guanghua Cui

Changjun Hou

Xiao Chen

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

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 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 present invention refers to a chromium-free insulation coating material for non-oriented silicon steel, comprising, in parts by weight, the following components: metal dihydrogen phosphate salt of 100 parts, epoxy resin of 10&#x2dc;60 parts, naphthenate drier or isooctanoate metal salt drier of 0.001&#x2dc;10 parts, organic solvent of 0.001&#x2dc;100 parts and pure water of 60&#x2dc;2000 parts. The metal dihydrogen phosphate salt is Al(HPO), Mg(HPO), Ca(HPO)or Zn(HPO); the epoxy resin is water-soluble epoxy resin or epoxy resin emulsion. Chromium-free insulation coating material of the present invention, after being coated on non-oriented silicon steel, renders highly transparent appearance, and has excellent insulativity, corrosion resistance, adhesiveness, weldability and manufacturability, so as to eliminate defects of the existing chromium-free coating, such as sticky and un-wear-resistant and to meet environment protection requirements.

Chromium-free insulation coating material for non-oriented silicon steel

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Shanghai, China

Zipeng Zhao