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Development of BRQ for hotrolled base material of oriented silicon steel in Benxi Steel#br# LI Dejun, ZHANG Bing, WANG Fei, ZHU Rongxin Electrical Steel    2024, 6 (4): 40-.   Abstract （113）      PDF（pc） （1134KB）（318）       Knowledge map    Save The development of oriented silicon steel hotrolled base materials combining the equipment conditions of Benxi Steel was introduced in this paper. The smelting and hot rolling process of oriented silicon steel BRQ hot rolling base material were designed based on the characteristics and limit conditions of steelmaking and continuous casting equipment at Benxi Steel, solving the problem of casting billet structure caused by electric stirring without secondary cooling section, as well as the problems of hot rolling slab heating furnace loading, temperature and time control, temperature drop, speed and stability in the rough and fine rolling area of the 3/4 continuous rolling unit. Through process optimization, a process and production plan corresponding to limited equipment conditions were formed, achieving stable production of oriented silicon steel hotrolled base material BRQ. Related Articles | Metrics

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Current status and development direction of electrical steel in China ZHANG Fengquan, ZHANG Weilin, SUN Wenquan Electrical Steel    2024, 6 (4): 1-.   Abstract （118）      PDF（pc） （2417KB）（310）       Knowledge map    Save Analyzed the current situation of electrical steel in China from the aspects of production, import and export volume, product structure changes, standards, grades, and magnetic induction changes in recent years. By analyzing the changes in the price index of electrical steel in the past two years, it is demonstrated that it conforms to normal market rules. The development direction of electrical steel is proposed from three aspects: electrical steel products, process technology,and process equipment, and several suggestions for electrical steel standards are proposed. Related Articles | Metrics

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Optimal control of the crosssectional shape of hotrollednonoriented silicon steel GUO Lihe, Li Zhenzhong, SUN Hao, LIU Shiying, WANG Chao Electrical Steel    2024, 6 (4): 35-.   Abstract （81）      PDF（pc） （1301KB）（262）       Knowledge map    Save The product accuracy of cold-rolled non-oriented silicon steel sheet needs to be guaranteed by hot rolling to provide excellent raw materials, and the hot rolling mill provides non-oriented silicon steel cold-rolled base material for the cold rolling mill, and the product cross-sectional shape is directly inherited to the final product size of cold rolling. The whole process of hot rolling ensures the precise control of the final convexity, wedge shape and transverse thickness difference of the product, involving the control of slab quality, heating furnace steel quality, rough rolling plate shape control, finishing roll design, centering rolling and channeling roll strategy, etc., to ensure the control accuracy of the final section shape of the hot rolled finished product, and to provide section guarantee for the cold rolling in the later process. Related Articles | Metrics

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Research status of laser scoring to reduce the iron loss of grain-oriented electrical steel ZHANG Jiasheng, ZHANG Jianzhi, LIU Ting Electrical Steel    2024, 6 (4): 45-.   Abstract （128）      PDF（pc） （530KB）（242）       Knowledge map    Save Laser marking is an effective means to reduce the iron loss of grainoriented electrical steel, and it is also the only marking technology that has been widely used in industry. In this paper, various techniques for refining grainoriented electrical steel magnetic domains and their advantages and disadvantages are listed. The types, characteristics and research status of laser scoring systems are reviewed, and the development of laser scoring technology is prospected. Related Articles | Metrics

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The influence of oxide layer thickness in decarburized plateon the forsterite film of Hi-B steel PANG Shufang, YOU Qinglei, JANG Qiwu, JIA Zhewei, LUO Li Electrical Steel    2024, 6 (4): 17-.   Abstract （91）      PDF（pc） （1705KB）（233）       Knowledge map    Save ThermoCalc software was used to simulate the oxidation process of decarburized annealing plates for oriented silicon steel, and the oxides that can be generated with different pH2O/pH2 were analyzed. During decarburization annealing at 800 ℃，It was found that when the range of pH2O/pH2 values was 0.19～23, the oxidation products were FeO and Fe2SiO4. Using a glow spectrometer to analyze the oxide layers of three different decarburized annealing plates with different oxygen contents, as well as the surface characteristics of the corresponding finished plates. Found out than the total oxygen content of decarburized annealed plates is different, but the oxygen content in the surface is alike, all of which are very high. As the oxygen content in the decarburized annealing plate increases, the thickness of the oxide layer increases.The oxygen content in the surface insulation film of the three finished boards is almost the same, and the forsterite film in the finished board corresponding to the decarburized annealing board with the thickest oxide layer is also the thickest, and the spinel is the deepest. Related Articles | Metrics

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Development and application research of non-oriented silicon steel technology for driving motors in new energy vehicles ZHANG Baolei, HU Zhiyuan, AN Dongyang, LIU Gongtao, CHENG Lin, ZHU Yuxiu, LI Guanglin, LI Zelin Electrical Steel    2024, 6 (5): 1-7.   Abstract （162）      PDF（pc） （1628KB）（219）       Knowledge map    Save Starting from the actual demand for new energy vehicles, Shougang Zhixin has successively conquered the ultra-low iron loss and magnetic induction enhancement control technology of high-grade non-oriented silicon steel, as well as the key manufacturing technology of ultra-high strength electrical steel. It has successfully developed 5 series, including low iron loss series, high magnetic induction series, ultra-high magnetic induction series, high-strength low iron loss series, and more than 20 specialized non-oriented silicon steel products, and has achieved the world’s first in the 35SWYS900 and 25SW1250H brand products. Applied research showed that the use of new development non-oriented silicon steel products in the drive motors of EV’s can help improve the efficiency, torque, and power density of the drive motors. Related Articles | Metrics

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Effect of heating rate on the microstructure and texture ofhigh grade nonoriented silicon steel during normalizing HUANG Jianlong, SHI Wenmin Electrical Steel    2024, 6 (4): 22-.   Abstract （89）      PDF（pc） （4188KB）（204）       Knowledge map    Save The effect of different heating rates on the microstructure and texture of high grade non-oriented silicon steel during normalizing was investigated by means of electron back-sacttered diffraction. The results show that the average grain size of the samples after normalizing increases when the heating rate increases from 16 ℃/s to 50 ℃/s. However, the average grain size of samples begins to decrease when the heating rate reaches 100 ℃/s. The average grain size of samples with {100}、{210}、{111} orientation increase remarkablely when the heating rate is 50 ℃/s, and γ orientation line texture of the samples after normalizing are weakened, λ orientation line texture of the samples after normalizing are strengthened, η orientation line texture of the samples after normalizing are strongest when the heating rate is 50 ℃/s. The texture factor TF of the sample after normalizing is biggest corresponding to the most favorable texture when the heating rate is 50 ℃/s.  Related Articles | Metrics

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Development and application of direct connection transmission for water cooling rolls LI Chaojin, FEI Dongdong, HUANG Hongwei, HUANG Qigang Electrical Steel    2024, 6 (4): 49-.   Abstract （77）      PDF（pc） （1699KB）（198）       Knowledge map    Save By analyzing the unstable transmission problems of water cooling rolls in a certain silicon steel normalization furnace, such as easy bending deformation, running jumping, and jamming, a direct connection transmission scheme for water cooling rolls is proposed and implemented. After implementation, the water cooling roll transmission is stable, eliminating a series of original problems, and achieving good application results, which is of great application value for improving the production efficiency of steel mills. Related Articles | Metrics

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Mechanism analysis and solution measures for nodulation of furnace roller carbon sleeve for annealing furnace ｒoller of silicon steel#br# YU Haomiao, TANG Xiaochao, WANG Lei, SI Liangying, JIANG Ziwu, LIU Lei, XIAO Huiming, LI Zelin, CHEN Xiaoyu Electrical Steel    2024, 6 (5): 36-42.   Abstract （157）      PDF（pc） （1850KB）（186）       Knowledge map    Save When the cold rolled silicon steel is subjected to decarburization and recrystallization annealing in a continuous annealing furnace, nodules often appear on the surface of carbon sleeve rollers. The nodules can easily cause pitting defects in the strip steel at high temperatures and affect the stacking coefficient of silicon steel sheets, so they are fatal defects in silicon steel finished products. The mechanism of carbon sleeve nodulation in silicon steel annealing furnace rollers were researched and analyzed in-depth in this paper, and solutions were proposed to control carbon sleeve nodulation. Related Articles | Metrics

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Research on the application technology of environmentally friendly coating for nonoriented silicon steel HUO Lijie, TIAN Jinlong, YANG Xueyan, LI Yang, TU Guopeng, LI Yu Electrical Steel    2024, 6 (5): 13-18.   Abstract （88）      PDF（pc） （1794KB）（179）       Knowledge map    Save With the strengthening of environmental policies, the production of non-oriented silicon steel and chromium free coating products has rapidly increased in recent years. There are certain differences in performance and quality stability between early chromium free coating products and chromium containing coatings. This article showed that adding additives to the coating solution can significantly improve the surface quality of the coating. Meanwhile, through resin selection and modification adjustments, the product’s weldability, rust resistance, insulation, and heat resistance have been improved. The quality and performance of chromium free coating products have been significantly improved, and they exhibit different characteristics in different application scenarios, leading to rapid development of chromium free coating products. Related Articles | Metrics

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Effect of final rolling temperature and normalizing time on precipitatesof highgrade nonoriented silicon steel LIU Pengcheng, HAO Juanjuan, WU Zhongwang, LI Zongwei, SUN Tingting Electrical Steel    2024, 6 (4): 27-.   Abstract （78）      PDF（pc） （1912KB）（177）       Knowledge map    Save n this paper, the effects of different final rolling temperature and normalization time on the precipitation behavior of high-strength non-oriented silicon steel were systematically studied. The results showed that the types of precipitates in normalized plates, cold-rolled decarburized plates and final annealed plates are similar, mainly including AlN+Nb(C, N)+Ti(C, N) composite precipitates and AlN and Ce(S, O) centered complex precipitates containing rare earth. The size of precipitates in the normalized plate increases and the surface density decreases when the final rolling temperature is increased and the normalization time is prolonged. And this trend was eventually inherited into the final annealed plate. When the final rolling temperature was 1 000 ℃ and the normalization time was 5 min, the size of precipitates is concentrated in the range of 0.3~1.0  μm, and the surface density of precipitates is 79 pieces /  1 000 μm2 Related Articles | Metrics

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Research on burner of oriented silicon steel high temperature ring annealing furnace and common fault treatment#br# ZHENG Hanchao, DONG Zhenhu, LI Xianhao, ZHAO Kai, ZHANG Yukun, XIE Panlong Electrical Steel    2024, 6 (6): 43-.   Abstract （77）      PDF（pc） （698KB）（175）       Knowledge map    Save In this paper, the oriented silicon steel high temperature ring annealing furnace is briefly introduced, the combustion system composition and combustion control mode are outlined, the burner and its structure are introduced in detail, the combustion system and principle of the high temperature ring annealing furnace are analyzed, and the common faults and treatment measures of the burner are detailed according to the field operation experience. Related Articles | Metrics

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Research and improvement practice on holes of non oriented silicon steel provided by 1 780 HSM ZHANG Bing, LI Dejun, ZHU Rongxin Electrical Steel    2024, 6 (6): 26-.   Abstract （45）      PDF（pc） （5387KB）（166）       Knowledge map    Save Taking advantage of the equipment renovation and control system upgrade of the Beiying 1 780 hot rolling unit, we have developed a production process for cold rolling of low and medium grade non oriented silicon steel hot rolling base materials for sheet metal. With the stability of the production process and the increase of output tasks, a large number of hole defects appear in the cold rolling process, causing huge cutting losses and seriously affecting the yield rate. Measures were taken to sample and inspect defects, uncoiler hot-rolled coils, track and compare hot-rolled gauges, and study equipment influencing factors to confirm the source of defects. These measures included changing the material of the guide strip lining for precision rolling and coiling, changing the guide strip control mode and reducing pressure, optimizing the opening degree of the guide strip upstream and downstream of the precision rolling mill, and optimizing the strip centering in finishing mill stands. As a result, the degradation rate of holes was reduced from 19.46 % to 1.65 %, significantly improving the yield rate. Related Articles | Metrics

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Research on helium cost reduction of TMEIC laser welding machine XIA Huan, DUAN Yadong, LIU Sheng, WU Chen Electrical Steel    2024, 6 (4): 54-.   Abstract （62）      PDF（pc） （1164KB）（166）       Knowledge map    Save Helium gas is an important working gas in laser welding, and controlling its consumption is beneficial for reducing costs. This article takes helium consumption as the research objective, and optimizes the TMEIC laser welding machine from the aspects of helium blowing time, working head blowing range, and secondary pressure reduction at the gas station. It reduces helium consumption and improves weld quality, effectively reducing the helium cost of the laser welding machine. Related Articles | Metrics

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Effect of continuous casting electromagnetic stirring on recrystallization of high magnetic induction oriented silicon steel#br# LI Ruifeng , SI Liangying , PANG Weiguang , TIAN Jianhui , ZHAO Songshan , HU Zhiyuan , MA Lin Electrical Steel    2024, 6 (5): 8-12.   Abstract （93）      PDF（pc） （2389KB）（164）       Knowledge map    Save The influence of continuous casting electromagnetic stirring process on the magnetic properties, secondary recrystallization, and primary recrystallization of 0.30 mm thick high magnetic induction oriented silicon steel were studied in this paper. The results showed that the final product samples using electromagnetic stirring process have a lower iron loss of P1.7/50 by 0.04 W/kg and a higher induction of B800 by 0.03 T compared to those without electromagnetic stirring. With electromagnetic stirring process, the high magnetic induction oriented silicon steel has a better magnetic property. The main reason is that for samples under electromagnetic stirring process the grain size of the primary recrystallization is smaller, the temperature of the secondary recrystallization is lower, the proportion of small angle Goss texture of the primary recrystallization is higher, and the deviation angle of the <100> texture around the ND direction is smaller after secondary recrystallization. Related Articles | Metrics

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In-situ EBSD study on the texture evolution of normalizednonoriented silicon steel at 900 ℃ Electrical Steel    2024, 6 (4): 9-.   Abstract （83）      PDF（pc） （3757KB）（160）       Knowledge map    Save The texture evolution of a highgrade normalized non-oriented silicon steel was studied using electron backscatter diffraction (EBSD) and field emission scanning electron microscope with an in-situ tensile test machine. Results showed that the grain orientation of the tested steel is mainly composed of (011) \[100\]. Under in-situ tensile stress, the grain orientation transit to crystal orientation such as (233) \[3-1-1\], (112)\[2-41\], (001)\[110\], and (455)\[5-22\]. The texture type of the tested steel gradually transforms from the initial {011}〈100〉 Gaussian texture to the surface texture. The orientation density of Gaussian texture continues to decrease with tensile deformation, and finally transit to {113}〈631〉 texture and {100}〈011〉 rotated cubic texture. In nonoriented silicon steel, due to the orientation relationship between AlN and the matrix, it hinders the slip and deformation of the initial grains with a normal orientation during insitu tensile process. This prevents it from becoming the dominant orientation and plays an important role in the formation of {113}〈631〉 texture and {100}〈011〉 rotated cube texture in the final grains. Related Articles | Metrics

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Effects of the number and size of stator iron core welds on the performance of permanent magnet synchronous motors LI Guanglin , WANG Bin , LIU Zhenfang , ZHANG Baolei , ZHAO Kai , LI Tianwen Electrical Steel    2024, 6 (5): 26-35.   Abstract （69）      PDF（pc） （3949KB）（157）       Knowledge map    Save Based on engineering practice, the influences of welding groove size, shape, position, and quantity on the three-phase induced potential imbalance of permanent magnet synchronous motors for 6-pole 54 groove new energy vehicles were firstly simulated and analyzed in this paper. And secondly, the variation law of the three-phase induced potential imbalance of the motor was simulated and analyzed under different stator slot numbers and motor pole numbers. Finally, prototype production and testing verification were carried out. Through simulation analysis and experimental verification, it is pointed out that for permanent magnet synchronous motors used in 6-pole 54 slot new energy vehicles, the width and depth of the welding groove will affect the imbalance of the three-phase induced potential of the motor. The imbalance of the three-phase induced potential of the motor is directly proportional to the size of the welding groove. At the same time, it was pointed out that for permanent magnet synchronous motors, from the perspective of reducing the imbalance of three-phase induced potential, the number of stator welding slots should not be an integer multiple of the number of poles. In addition, the corresponding relationship between the balance of three-phase voltage and current of the motor and the torque output and operating efficiency of the motor was also pointed out. Related Articles | Metrics

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Research and control of roll nodulation in non-oriented silicon steel annealing furnace#br# ZHANG Hongbo, YU Xuecheng, WU Nai, ZHANG Guohong, YANG Lei, WANG Biao Electrical Steel    2024, 6 (6): 36-.   Abstract （76）      PDF（pc） （2265KB）（153）       Knowledge map    Save For non-oriented medium and low grade silicon steel products, strip stamping defects caused by annealing furnace roll nodules are common defects in the quality control process of silicon steel. Generally, the higher the silicon content, the higher the probability of nodules occurring in blast furnace rolls. According to production experience, after the occurrence of furnace roll nodding, it is necessary to take measures such as online grinding of rolls, alkaline waste discharge, and increasing the current of brush rolls to slow down nodding, but the above methods can only make up for the negative impact of nodding to a certain extent, and cannot fundamentally eliminate nodding, which makes the production fall into a vicious cycle, not only can't meet the conditions of batch continuous production, but also can't. At the same time, it will affect the quality delivery of highend customer orders and reduce the market competitiveness of silicon steel brands. A series of comparison and verification experiments were carried out to control roll tumbler defects of annealing furnace, and effective measures were taken to control roll tumbler through the matching control of partial pressure ratio of annealing furnace and annealing process, ensuring good strip surface cleaning quality, and reasonably controlling roll speed and strip speed difference. Related Articles | Metrics

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Research progress on factors affecting the quality of magnesium silicate  bottom layer of grain-oriented silicon steel LIU Xuming, XUAN Dongpo, ZHANG Haili, ZHAO Yang, JIANG Qiwu Electrical Steel    2025, 7 (1): 6-.   Abstract （72）      PDF（pc） （9829KB）（139）       Knowledge map    Save Grain-oriented silicon steel is a critical soft magnetic material, and the silicate magnesium layer is an integral part of the product structure, which presents significant challenges in control. The quality of the silicate magnesium layer has a profound impact on the surface quality of grainoriented silicon steel. The uncertainty in factors such as the oxide layer, annealing atmosphere, annealing temperature, and magnesium oxide can lead to defects in the final silicon steel product, thereby limiting, to some extent, the development of the grain-oriented silicon steel industry. Therefore, this paper summarized the influence of these factors on the silicate magnesium layer based on the process characteristics of grain-oriented silicon steel and the research conducted both domestically and internationally. Additionally, it identifies areas that require further study in the future.  Related Articles | Metrics

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Effect of shearing on the magnetic properties of industrial non-oriented silicon steel sheets CHE Shangfeng, ZHANG Feng, WANG Bo Electrical Steel    2024, 6 (6): 20-.   Abstract （49）      PDF（pc） （1326KB）（138）       Knowledge map    Save Based on the industrial manufacture of non-oriented silicon steel sheets, the influence of shear gap size, sample size, sample direction, and the ratio of yield and tensile on the magnetic properties were studied. The results show that with the increase of shear gap, the proportion of shear plane in thickness direction decreases gradually. Thus, the iron loss and magnetic induction will deteriorate by different degree, and the iron loss degradation rate is much higher than the magnetic induction degradation rate. Moreover, the iron loss degradation rate in the L direction is much higher than that in the C direction. With the decrease of sheared sample size, the iron loss and magnetic inductance will also deteriorate and are affected by the yield ratio of the material. The deterioration rate of magnetic properties is obvious increase with the increase of yield ratio for the sheared sample. Related Articles | Metrics