Table of Content

28 May 2020, Volume 2 Issue 1

Previous Issue   

Research on production capacity and demand of high performance electrical steel in China#br#

CHEN Zhuo

2020, 2(1):  1-8. 

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High performance electrical steel is one of the important raw material products indispensable for the modernization construction, highquality development and people's life in China. It is also the development direction of highquality development, product upgrading, energy conservation and environmental protection of electrical steel industry in China.The production capacity of electrical steel, the capacity of normalization (acid pickling), the capacity ,output change and apparent consumption of electrical steel in recent five years, were studied and analyzed in this paper ,as well as the future demands of transformer to high magnetic induction oriented electrical steel (HiB), and medium and small motors, large motors, household appliances, new energy vehicles, emerging fields, etc. to high grade (high efficiency, high magnetic induction) nonoriented electrical steel, and electric power, aerospace, medical devices and household appliances etc. to extremely thin electrical steel strip (the thickness less than 0.1 mm). At the same time, the demand of high performance electrical steel in China is predicted and some suggestions are put forward.

Progress on grain oriented electrical steels of Aperam South America

MA Changsong, SHEN Kanyi

2020, 2(1):  9-14. 

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The quality improvements and researches of grain oriented electrical steels in Aperam South America were introduced, including the production process and product types, the research on AlN precipitation behavior of high magnetic induction oriented electrical steel, the improvement of hot rolling and cold rolling process, effect of magnesia blending on the magnetic properties, secondary recrystallization characteristics, etc. which are useful for the reference research of grain oriented electrical steel.

Analysis of performance simulation of iron core and electromagnetic characteristics of 0.18 mm grainoriented silicon steel with ultralow loss#br#

CHENG Ling, MA Guang, HU Zhuochao, GONG Weiguo,  YANG Fuyao, MENG Li, DONG Han, CHEN Xin

2020, 2(1):  15-21. 

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The development of S15 type ultrahigh energy efficiency transformer based on low loss grainoriented (GO) silicon steel is of great significance for further promoting energy saving and efficiency enhancing of power grid. The magnetic properties and magnetostrictive characteristics of 0.18 mm GO steel, 1K101-S and 1K102-P amorphous alloy were studied using measurement system under arbitrary waveform of magnetic induction. The core losses of 0.18 mm GO steel under harmonic and DCbias were analyzed, and the modeling and simulation analysis of iron core as well as winding of S15 type transformer were carried out by using the MagNet finite element software. When the magnetic flux density is 1.35 T, the core loss of 18QH065 GO steel is as low as 0.349 W/kg, which is approach to the level of amorphous alloy. The magnetic induction B800 of GO steel is 0.32-0.40 T higher than that of amorphous alloy strip. The magnetostrictive coefficient of GO silicon steel is 0.29×10-6, which is lower than that of amorphous alloy by one order of magnitude. Besides, the harmonic loss of 0.18 mm silicon steel is significantly lower than that of 0.23-0.30 mm silicon steels, and the third and fifth harmonic losses under content of 10 % increased by 12.9 % and 16.0 % respectively. DC bias (0-150 A/m) has an obvious effect on the core loss of 0.18 mm GO steel under low magnetic flux density (MFD), while the loss is almost the same after MFD higher than 1.9 T. Finally, the noload loss of designed 10 kV/630 kVA transformer is 392.5 W (31.1 % lower than that of transformer with firstgrade energy efficiency in standard of GB 20052-2013), and the noise is about 10 dB lower than that of amorphous alloy transformer with the same capacity, which means significant advantages of energy conservation and environmental protection.

Simulation analysis of coil temperature uniformity in inner cover of high temperature annealing furnace for oriented silicon steel#br#

ZHOU Yujun, HU Shoutian, SHEN Xinyi, ZHOU Qianhua, DANG Ningyuan

2020, 2(1):  22-26. 

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The temperature distribution of inner cover was studied by using a simulating software of FLUENT to simulate the hearth model , the single inner cover model and the temperature optimization model of an annular furnace, then an improvement scheme of temperature uniformity was proposed and tested by experiment. The results showed that the temperature difference and magnetic uniformity between top and bottom of the steel coil were successfully optimized by superimposing a heat insulation material on the side of the coil base, which can provide supports for the improvement in magnetic properties of oriented silicon steel.

Development overview and trend Analysis of  electric drive system of new energy vehicle

GAO Lingyu, ZHOU Huijun, WANG Cheng, PEI Ruilin

2020, 2(1):  27-31. 

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The development history and market status of new energy electric systems for new energy vehicles(EV), and their developments of electric drive systems, vehicle types and new electric motors and future trends, have been analyzed and researched in this paper, which has certain help to guide the application of electric steel and other materials to new energy vehicles.

Replacing oriented silicon steel with highgrade nonoriented silicon steel to make phaseshifting transformer core#br#

RAO Xingning, ZHANG Zhengkang

2020, 2(1):  32-34. 

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This paper introduced the design and manufacturing method of a phaseshifting transformer and its requirements for the quality of silicon steel, and put forward the method of making phaseshifting transformer core with the material of highgrade nonoriented silicon steel. The practice showed that the phaseshifting transformer made of highgrade nonoriented silicon steel can fully meet the national standards and user's requirements, which has little difference in performance with oriented silicon steel. And  most significantly, it has the advantage of greatly reducing material cost, reducing tranformer's noise and eventually improving the production efficiency, which has a wide application value.

Thermodynamic calculation and theoretical analysis of equilibrium precipitated phases in highgrade nonoriented silicon Steel#br#

PANG Shufang, LI Yuanhua, GAO Zhenyu, CHEN Chunmei, LI Yadong, LIU Wenpeng

2020, 2(1):  35-40. 

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Based on the typical composition of highgrade nonoriented silicon steel, the influence of Mn and Al changes on the equilibrium precipitated phases were studied through thermodynamic simulation calculations. The results showed that the main equilibrium precipitated phases of the highgrade nonoriented silicon steel are AlN, FCC#2, MnS, M3P, M7C3, M23C6 and cementite, FCC#2 phase is a Ti(C,N) compound, and M7C3 and M23C6 are compounds with high Mn content. As the Mn content increases, the transition temperature of MnS precipitation increases sharply. When Mn content is high, with the decrease of temperature, the M7C3 phase will firstly transform into the M5C2 phase then into the M23C6 phase. With the increase of Al content, the transition temperature of Ti (C,N) compounds decreases; the AlN precipitation transition temperature increases. the Al content has a smaller effect on the MnS, M3P, M7C3, and M23C6 phases.

Study on production technology of non oriented silicon steel 50BW600 for high voltage motor#br#

QIAO Haohao, LI Dejun, LI Yiwei

2020, 2(1):  41-44. 

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The requirements for electromagnetic properties of silicon steel for high voltage motors are gradually improved as the continuous upgrading of products in downstream electric machinery plant. In this circumstance, BenGang Steel Plates Co. Ltd. has succeeded in developing a nonoriented silicon steel 50BW600 by reasonably designing the chemical composition of the product and its rolling process, and using the cover annealing process to replace the normal process, and improving the continuous annealing system, which were combined with the company's existing technical equipment capacity. The developed nonoriented silicon steel 50BW600 accords with expected target on the electromagnetic performance, with the iron loss less than 3.7 W/kg and the magnetic induction higher than 1.68 T, meeting the supply standard, and enhancing the market competitiveness of the product.

Research on testing of magnetic properties of the silicon steel with C6 thick coatings#br#

TUBI Munai, SHI Guofa, XIAO Haihang

2020, 2(1):  45-47. 

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In this paper, the samples of a highgrade nonoriented silicon steel with different thickness of C6 coating were prepared and tested to compare their conventional magnetic properties. The results showed that the magnetic polarization decreased monotonously, and the iron loss increased monotonously, as the thickness of the samples' coating gradually increased, and the more accurate correction value of those data was also obtained. The work in this paper has certain reference significance for the design of large motor and the application of highgrade nonoriented silicon steel with C6 coating.

Analysis of factors affecting insulation performance of oriented silicon steel

LIU Ting, HU Shoutian, LIU Min, DU Yuquan, TIAN Wenzhou, CHEN Bo, SONG Gang, JIANG Jie, FU Gang

2020, 2(1):  48-51. 

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Insulation performance is an important index of oriented silicon steel. The effects of the coating sintering temperature, the silica sol content in coating solution and the coating amount on the insulation property of the oriented silicon steel were studied in this paper. And the research indicated: As the sintering temperature increases, microscopic cracks gradually appear on the coating surface. After the annealing temperature reaches 900 ℃, the coating surface cracks will increase sharply and lead to the decrease of the coating insulation. At the same sintering temperature, increasing the content of SiO2 in the coating solution will lead to micro-cracks on the coating surface, which is not conductive to the insulation performance of the coating. At the same sintering temperature, increasing the coating amount is beneficial to increasing the interlayer resistance of the steel plate. When the sintering temperature is 850 ℃ and the coating amount is 6 g/m2, the interlayer resistance of the steel plate can reach 82.6 Ω·cm2.