Electrical Steel

Research on the development change and the demand of electrical steel in China in the new era#br#

CHEN Zhuo

2019, 1(2): 1-6.

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The manufacturing technologies and the quality of electrical steel were taken as an important symbol to measure the production and the technological level of a country' s steel products. This paper studied the development changes of electrical steel in China, introduced the development course of China' s electrical steel industry from nothing to existence and from weakness to strength, from the aspects of the production capacity, the output, the apparent consumption, the import and export quantity, the production and technology, and so on. Meanwhile the positive policies, the adverse factors, the downstream industries related with electrical steel were analyzed, the demand growth of electrical steel in China was forecast, and some suggestions were put forward.

Research on cold rolling equipment status and cold rolling technology of electrical steel

ZHANG Fengquan, HU Wencai

2019, 1(2): 7-13.

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This paper introduced the cold rolling equipment of electrical steel in both domestic and international enterprises. Combining with the cold rolling equipment of electrical steel,the cold rolling technologies of highgrade electrical steel were also researched, which could give advice on related electrical steel grades and equipment selection.

Examination and analysis of point indentations in grain oriented silicon steels

YANG Ping, LIU Liying, ZHANG Haili, JIA Zhiwei

2019, 1(2): 14-20.

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The surface quality of grain oriented silicon steels is another most important key factor that controls the final qualities of steel products. When the magnetic properties are checked to be satisfactory, the poor surface quality could lead to the degrading or even abandonment of products. Bare grains, water marks, indentations, etc, are all typical surface defects of grain oriented silicon steels during their developments. This paper aims to examine and analyze the point indentations occurred in the final surface sheets of grain oriented silicon steel so as to provide basic features of point indentations and possible reasons of their formation. For this purpose, laser confocal microscopy, scanning electron microscopy, energy dispersive spectroscopy and electron backscatter diffraction technique are used. It is shown that the holes of indentations contain mainly insulating materials, whereas their surroundings are much rich in Fe element of sheet matrix. The compositions of both positions are different to those of normal insulating layers away from them. Based on these features and the facts that the no trace of deformation or recrystallization with fine grains are observed in the interior steel matrix directly located below indentation hole, it is suggested that the investigated indentations should be caused by either the inhomogeneous point defects of oxide layer or inhomogeneous MgO layer which form as hard particle objects and induce a strong plastic deformation in the soft steel sheets during high temperature annealing.

Effect of cold rolling reduction rate on cold rolling andannealing texture of thin oriented silicon steel

LUO Xingen, HUANG Xinbo, GUO Xiaolong , YANG Jiaxin, SHEN Minghui

2019, 1(2): 21-28.

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In the experiment, different thickness of low temperature oriented silicon steel hot rolled plate was cold rolled to 0.18 mm. The texture of the surface and central layer of the cold rolled plate was analyzed by XRD, and the section of the decarburized plate was analyzed by EBSD. In the cold rolled samples ,the results showed that the total content of {111} surface texture decreased, and {100} surface texture increased with the increase of reduction rate. In decarburized samples, the {111} texture increased significantly, especially the {111} 〈112〉 texture, and the {100} texture decreased significantly, especially the {100} 〈011〉 texture, and the {411} 〈148〉 texture increased significantly too.The grain size decreased with the increase of the reduction rate. The texture which was not conducive to the development of secondary recrystallization increased obviously, while the favorable CSL grain boundary decreased slightly with the increase of reduction rate.

Effect of the coating on the noise characteristics of grainoriented silicon

CHENG Xiangwei, XIE Wenliang, YANG Chao, ZhU Yechao

2019, 1(2): 29-32.

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The main source for the transformer noise is magnetostriction of grain-oriented silicon steel.In this paper, the effects of magnesium coating and phosphate coating on magnetostriction of grain-oriented silicon steel have been studied. The results showed that magnesium coating and phosphate coating could reduce the magnetostriction of grain-oriented silicon steel. Increasing the thickness of coating could decrease the hetero domain and 90 degree domain, and improve the noise characteristics of the oriented silicon steel.

Effect of under layer structure on surface adhesiveness of oriented silicon steel

LIU Min, HU Shoutian, LIU Ting, WU Hanzhang, DU Yuquan, SONG Gang

2019, 1(2): 33-36.

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The effects of the underlayer structure of oriented silicon steel on adhesiveness were studied by comparing the microstructure and composition distribution of oriented silicon steel with better adhesiveness and poorer one. The results showed that the underlayer is mainly divided into phosphate insulating coating and magnesium silicate underlayer (partial magnesium silicate bottom layer is formed into the base material to form pinning), which have no obvious transition layer and fusion area. The main source of adhesive force of oriented silicon steel should be the mechanical action between the magnesium silicate underlayer and the steel base, and the adhesive force is mainly determined by the structure of the magnesium silicate underlayer. Good adhesiveness requires dense a magnesium silicate underlayer with a large pinning particles closing to the bottom layer of magnesium silicate and forming a "peninsula". The magnesiumaluminum spinel in the bottom layer should be distributed into the pinning.

Study on initiation mechanism and propagation of fatigue crack in non oriented electrical steel#br#

DU Liying, LIU Dong, KUANG Lanxiang, SHANG Lun, TU Yinghong

2019, 1(2): 37-41.

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This paper takes 30WGP1600 nonoriented electrical steel as the research object and obtains the distribution characteristics of fatigue life through a large number of fatigue tests. The initiation and propagation of fatigue cracks were systematically analyzed by optical microscope and scanning electron microscope. The results showed that the fatigue crack initiation mainly occurred in the grain, grain boundary and AlN particles on the side surface or the upperlower surface of the sample. The propagation zone of fatigue cracks shows typical cleavage river pattern, and the instantaneous fracture zone shows ductile characteristics similar to single crystal.

Study on high temperature ductility of Fe-3.0 %Si nonoriented electrical steel

LIU Qingsong, ZHANG Zhenhai, WANG Litao, PEI Yinghao, QI Xuan

2019, 1(2): 42-44.

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The high temperature tensile test of high grade non-oriented electrical steel containing 3.0 % Si was carried out with Gleeble-2000D thermodynamic simulator at different temperatures. The effect of deformation temperature on deformation resistance and high temperature ductility was analyzed. The results showed that the deformation resistance at low temperature has a strong sensitivity to the deformation temperature, the tensile strength decreased rapidly from 290 MPa to 30 MPa when the deformation temperature increased from 600 ℃ to 850 ℃.The high grade non-oriented electrical steel containing 3.0 %Si has good thermoplasticity and strong crack resistance, with the shrinkage of deformation over 90 % at the temperature of 600 ℃ to 1 150 ℃, and no zone II and III brittle temperature zone.

Development of nonoriented electrical steel coating and technology progress of environmentally friendly insulation coatings

ZHU Yuzhen

2019, 1(2): 45-48.

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The development process of nonoriented electrical steel insulating coatings technology is introduced in this paper, and the hazards to environment and human body of Cr6+ in chromium coatings used in the production of nonoriented electrical steel are analyzed emphatically. The performances of environmentally friendly coating and chromiumcontaining coating solution for the nonoriented electrical steel are compared, which indicates the necessity and feasibility of promoting the application of environmentally friendly coatings at present.

Research on the application of high grade non oriented silicon steel in largescale generator field

GAO Zhenyu, LI Yuanhua, LIU Wenpeng , LUO Li, JIANG Fujian

2019, 1(2): 49-53.

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The production and applying technology of highgrade nonoriented silicon steel used in generator field has been studied and analyzed, of which the results were used to improve the electromagnetic property of highgrade nonoriented silicon steel product 50AW310 made in Ansteel according to the requirements of generator design and manufacturing process. The updated product 50AW310DF has better magnetic properties, magnetization characteristics and overall qualities, which means that Ansteel has a higher technological level to produce highgrade nonoriented silicon steel, and meanwhile the developing path and direction of high-grade non-oriented silicon steel is figured out in this company.

Study on hightemperature annealing tunnel furnace used in the production of oriented silicon steel#br#

LIU Pengcheng, LIU Baozhi, LI Gang, HUANG Bin, WANG Qiang, ZHANG Hao, LI Shoujun, QI Wei

2019, 1(2): 54-57.

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This paper introduced the main equipment configuration and functions of hightemperature annealing tunnel furnace used in the production of oriented silicon steel, and analyzed its advantages in the aspects of floor area, production efficiency, energy saving, product performance consistency and investment, which provides a new type production equipment and process reference for the hightemperature annealing of oriented silicon steel in China.

Calculation and analysis of strip suspension curve model in the continuous annealing and coating line

ZHANG Wei, HE Yunfei, LI Wen, WANG Feng, ZHANG Feng

2019, 1(2): 58-60.

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In the continuous annealing and coating line for nongrain oriented silicon steel, the insulation coating should be coated on the strip surface after annealing. To ensure the quality of coating and avoid the undried coating liquid on the strip surface been destroyed, the coated strip was suspended to through into the floating furnace. This paper researched the strip between the coater and the floating furnace, and described the process of establishing the strip suspension curve in detail, calculating and analyzing four suspension curves under different working conditions, which can provide theoretical basis for reasonable arrangement of the unit.

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