Volumn Content

Electrical Steel 2021 Vol.3 Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Study on the service properties of GO silicon steel in the 3D wound core WANG Xiaoyan, SUN Liang, TAO Li, LIANG Qingning, SONG Gang Electrical Steel    2021, 3 (1): 1-.   Abstract （132）      PDF（pc） （1083KB）（474）       Knowledge map    Save The reason of harmonic wave in the magnetic flux density was analyzed according to the magnetic circuit characteristic, distribution of magnetic flux density, magnetic properties of silicon steel sheet and connection mode of excitation winding. Using the spectrum analysis results of magnetic flux density in the frame of the core as the measurement condition, the service properties of GO silicon steel sheet applied to 3D wound core transformer were measured. The basis of the measurement method was proposed by analyzing the magnetic properties of different size GO silicon steel sheets and their application status in 3D wound core. The type selection suggestions was proposed by the test results of different size silicon steel sheets. Related Articles | Metrics Select Study on the relationship between coating adhesion andglass layer quality in grain oriented silicon steel#br# JIA Zhiwei, ZHANG Haili, WANG Xiaoda, MA Dandan, WANG Baochuan, YANG Ping Electrical Steel    2021, 3 (1): 7-.   Abstract （109）      PDF（pc） （2119KB）（487）       Knowledge map    Save The adhesion of insulation coating is an important index to measure the surface quality and applicability of grain oriented silicon steel, and low adhesion will reduce the qualified rate and applicability of products. In this paper, the typical phase and structure characteristics of the surface layer were examined by SEM and EDS, and the influencing factors of insulation coating adhesion was analyzed to provide theoretical basis for improving the adhesion. The results showed that the adhesion level is corelated with the structure of glass layer, and the surface layer of high adhesion samples is mainly composed of continuous layer structure (insulating layer and glass layer) with a total thickness of about 3 μm and spinel particles of 0.5~4 μm.Besides, the glass layer with continuous and uniformly distribution in the matrix and fine embedded spinel particles can improve the adhesion. Related Articles | Metrics Select Effects of hotrolled coiled temperature on microstructure, texture andmagnetic properties of low silicon nonoriented electrical steels#br# AN Lingzi, LIU Haitao, WANG Guodong Electrical Steel    2021, 3 (1): 15-.   Abstract （143）      PDF（pc） （1517KB）（297）       Knowledge map    Save The effects of hotrolled coiled temperature on microstructure, texture and magnetic properties of 0.9 % Si  nonoriented electrical steels were investigated based on conventional process. The study found that the coiled microstructure at 650 ℃ was mainly characterized by fine deformed grains, causing the fine and heterogeneous recrystallized annealed grains. Nevertheless, coarse and homogeneous coiled microstructures were obtained at 700 ℃ and 750 ℃, resulting in homogeneous microstructure in final annealed sheets. After coiling, the γfiber texture significantly weakened and λfiber texture increased in the final annealed sheets. The magnetic induction significantly improved with the coiling temperature increasing. Compared to that without coiling, the average magnetic induction (B50) increased by 0.013 T when coiling at 750 ℃. It indicated that the coiling temperature was one of the key factors that affect the magnetic properties. Related Articles | Metrics Select Study of 0.1 mm ultrathin nonoriented silicon steel fabricated by strip casting FU Shan, WEI Qingqing, CHEN Dongmei, LIU Haitao Electrical Steel    2021, 3 (1): 22-.   Abstract （146）      PDF（pc） （1095KB）（372）       Knowledge map    Save The 0.1 mm thick Fe3.2%Si0.7%Al ultrathin nonoriented silicon steel were successfully produced by strip casting. The microstructure, texture evolution throughout the whole processing and effect of onestage and twostage cold rolling methods on magnetic properties were investigated in detail. The results showed that the microstructure of cast strip was characterized by typical columnar grains. Equiaxed ferrite grains were obtained after onestage cold rolling and annealing, and the associated texture was dominated by α*fiber and γfiber texture. The magnetic induction B50 of final annealed sheets was 1.681 T, which was much higher than that of ST100 in Japanese. The higher iron loss might be related to the lower purity of steel under laboratory conditions. Therefore, the magnetic induction of nonoriented silicon steels produced by strip casting significantly improved. Compared with the onestage cold rolling method, the grain size of final annealed sheets produced by the twostage cold rolling method was larger, and the unfavorable γfiber texture weakened, resulting in the iron loss obviously reduced and magnetic induction B50 increased from 1.681 T to 1.734 T. Related Articles | Metrics Select Magnetic properties fluctuation analysis for headand tail of nonoriented electrical steel HUA Guolong, FAN Lifeng , XIAO Lijun, YUE Erbin, LU Bin,  HE Jianzhong, QIAO Jiqiang, ZHANG Wenbo Electrical Steel    2021, 3 (1): 28-.   Abstract （127）      PDF（pc） （3553KB）（365）       Knowledge map    Save In order to find the reasons for the fluctuation of magnetic properties in the head and tail during the industrial production of nonoriented silicon steel，the microstructure and texture were analyzed by OM, XRD and EBSD techniques. The results showed that: (1)because of the temperature fluctuation, the closer to the tail, the banded structure was more serious, and the banded structure still existed in the core at 25 m from the tail; (2) the average grain size of the head and tail of the strip steel was smaller than that of the middle 7~10 μm, which is the direct cause of the reduction in iron core loss of the head and tail; (3) compared to the middle of the strip steel, the unfavorable texture {111}〈112〉 of the head specimen was reduced by 2.8 %, but the favorable texture {100}〈010〉 was also reduced by 1 %,which resulted in a small difference in magnetic flux density.  Related Articles | Metrics Select Interpretation of GB 18613-2020 "Minimum allowable values of energyefficiency and values of efficiency grades for motors"#br# HUANG Jian Electrical Steel    2021, 3 (1): 33-.   Abstract （727）      PDF（pc） （404KB）（544）       Knowledge map    Save The standard of GB 18613 is an important mandatory national standard in the small and mediumsized motor industry.The development process of the standard was briefly described in this paper, and the changes of the newly issued national standard GB 18613-2020, the impact on the small and mediumsized motor industry and the demand for electrical steel were also introduced.  Related Articles | Metrics Select Review of the 13th fiveyear plan and prospect of the 14thfiveyear plan for electrical steel in China#br# CHEN Zhuo, XU Yu Electrical Steel    2021, 3 (1): 37-.   Abstract （169）      PDF（pc） （1049KB）（361）       Knowledge map    Save During the 13th fiveyear plan period, electrical steel has made important contributions to the modernization construction and people's living needs. The electrical steel industry of China during the period of the 13th fiveyear plan was reviewed from the aspects of production scale, variety and technological progress, patent technology, import and export quantity and industrial shortage. At the same time, some suggestions on the development of electrical steel in China during the  14th fiveyear plan were put forward, which can guide the sustainable and healthy development of electrical steel in our country, guide the correct investment of enterprises, plan the strategy of electrical steel, restrain the structural surplus of electrical steel and avoid the new surplus production capacity. Related Articles | Metrics Select Patent analysis of silicon steel for new energy vehicles of Nippon Steel Corporation SUN Zhu Electrical Steel    2021, 3 (1): 43-.   Abstract （145）      PDF（pc） （452KB）（432）       Knowledge map    Save According to the current development status of new energy vehicles, the effective patent technologies of Nippon Steel Corporation in the field of silicon steel for new energy vehicles were analyzed in the past ten years, and the characteristics of the patent technologies and core patents were also researched. Related Articles | Metrics Select Electrical Steel    2021, 3 (1): 47-.   Abstract （62）      PDF（pc） （645KB）（108）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2021, 3 (1): 53-.   Abstract （48）      PDF（pc） （460KB）（110）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2021, 3 (1): 58-.   Abstract （58）      PDF（pc） （391KB）（107）       Knowledge map    Save Related Articles | Metrics Select Effect of siliconizing and annealing on the organization andmagnetic properties of grain oriented silicon steel#br# YANG Xin, LIU Gang Electrical Steel    2021, 3 (2): 1-4.   Abstract （174）      PDF（pc） （640KB）（944）       Knowledge map    Save The changes of microstructure, phase and composition of 3 % grain oriented silicon steel after solid powder siliconizing and diffusion annealing as well as their effects on magnetic properties were studied. The results showed that wellstructured compound layer could be prepared on grain oriented silicon steel by infiltrating silicon at 950 ℃ for 6 minutes，and the surface phases were Fe3Si and FeSi. After diffusion annealing at 1 050 ℃ for 1 hour，annealed samples with good organization properties were obtained. When the annealing time was 2 hours, a homogenized sample with the mass fraction of silicon close to 6.5 % (6.43 %) was obtained，and the surface phase was the single αFe phase. After solid powder siliconizing and diffusion annealing，the medium and high frequency iron loss of the sample was significantly reduced by 50 %~86 %，and the iron loss reduction rate of the sample annealed for 1 hour was higher. After solid powder siliconizing and diffusion annealing，the magnetic induction intensity decreased slightly. Related Articles | Metrics Select Causes analysis of the surface white stripe defect on grain oriented silicon steel WANG Zirong, YANG Xiuzhi, XIONG Zhiwei, LI Jiangbo, CAI Miao Electrical Steel    2021, 3 (2): 5-10.   Abstract （258）      PDF（pc） （1237KB）（772）       Knowledge map    Save The causes of white stripe defects on the surface of grain oriented silicon steel were analyzed. The surface morphology was observed by threedimensional video microscope, the crosssection morphology of the steel and the surface morphology of the defect area after pickling were observed by field emission scanning electron microscope, and the energy spectrum composition was analyzed by energy spectrum analyzer. The analysis result showed that there was elliptical insulation layer falling off in the white stripe defect, and the magnesium silicate substrate in the defect area was abnormal, of which the thickness was much thicker than the normal area. It indicated that the white stripe defect area had been damaged before coating magnesium oxide. After pickling, the spicules with the main composition of O, Al and Si were found in the defect area of white stripe. It was found that the spicules originated from the refractory used in decarburization annealing furnace. The refractory fiber fell and adhered into the surface of the steel strip during decarburization annealing, and was pressed into the strip surface in the process of secondary rolling, which destroyed the oxide film, and affected the formation of the magnesium silicate substrate, and caused the white strip defect on the surface of the steel production after high temperature annealing. This kind of defect has been eliminated by improving the use method of insulating refractory fiber. Related Articles | Metrics Select Process optimization of hot rolling on grain oriented silicon steel containing copper WU Jin, WAN Fangqian, ZHANG Qingchun Electrical Steel    2021, 3 (2): 11-15.   Abstract （135）      PDF（pc） （1798KB）（556）       Knowledge map    Save In viewing of the improving grading criteria of grain oriented silicon steel containing copper, through controlling the critical hot rolling process of the grain oriented silicon steel, and formulating the effective optimization mode of the velocity control of finish rolling, reducing the rolling time on finish rolling process and increasing the finishing temperature of finish rolling, the qualification rate of the degree of the grain oriented silicon steel containing copper was remarkably improved. The research results showed that more dispersed precipitates were produced in the containgcopper grain oriented silicon steel at higher finishing temperature, and the {110} surface texture in the quarter layer of hot rolled plate increased obviously. The productive practice proved that the effective optimization mode of the velocity control of finish rolling can evidently optimize the magnetic properties of the containingcopper grain oriented silicon steel. Related Articles | Metrics Select Effect of coiling temperature on microstructure and magnetic properties of 0.5 % Si nonoriented silicon steel LU Jiadong, WU Shengjie, LI Hui, YUE Chongxiang Electrical Steel    2021, 3 (2): 16-20.   Abstract （156）      PDF（pc） （2414KB）（603）       Knowledge map    Save The effects of coiling temperature on the microstructure and magnetic properties of 0.5 % Si nonoriented silicon steel were studied under industrial production. The results showed that when the coiling temperature increased from 600 ℃ to 700 ℃, the microstructure of the hotrolled steel was more uniform, the grain size of the hotrolled steel and the annealed steel was larger, and the favorable texture components was increased and the unfavorable texture components was decreased, which reduced the core loss and rose the magnetic induction of the annealed steel. When the coiling temperature was 700 ℃, the magnetic properties of the annealed steel were better, with the core loss P1.5/50 of 5.329 W/kg and the magnetic induction B50 of 1.762 T. Related Articles | Metrics Select Effect of RH refining process on quality of non oriented electrical steel LI Ciying, SUI Yafei, TIAN Fei, XIE Kai, WU Gaoliang, WU Zejiao Electrical Steel    2021, 3 (2): 21-31.   Abstract （173）      PDF（pc） （2678KB）（661）       Knowledge map    Save In order to improve the quality of non oriented electrical steel and reduce the production cost, the evolution law of inclusions, the changes of magnetic properties and surface quality of finished products in RH refining process under different molten steel circulation flow rates were analyzed. The results showed that the change of RH refining process had no obvious effect on the composition of inclusions in molten steel, the number of inclusions in hot rolled samples and the magnetic properties of finished products, but had a negative correlation effect on the surface quality. The larger the circulating flow rate of molten steel was, the lower the inclusion degradation rate was. The equivalent area of inclusions in molten steel, especially the larger inclusions above 5 μm, was negatively related to the circulating flow rate of molten steel. The inclusions (including the second phase precipitates) in hot rolled samples were mainly the second phase precipitates AlN and MnS, and a small amount of oxide inclusions. The amount of inclusions had no correlation with RH refining process. On the premise of ensuring the quality to meet the requirements, the circulation flow of molten steel in RH process can be adjusted appropriately to reduce the production cost. Related Articles | Metrics Select Dynamic analysis and practice for the RH desulphurization with calcium aluminate flux CHEN Yuxin, SUN Liang, CHEN Feng, CAO Renfeng Electrical Steel    2021, 3 (2): 32-39.   Abstract （145）      PDF（pc） （1440KB）（527）       Knowledge map    Save Calcium aluminate desulphurization flux for RH process was designed to avoid the corrosion and storage problem of CaO-CaF2 flux. The Al2O3 content was set a range of 33 %-37 % in accordance with slagsteel sulphur ratio and melting time, the residual slag inside chamber was also taken into consideration. The optimized range of particle size was between 3-5 mm. The flux was put into production trials and the result was evaluated. It was concluded that the desulphurizing effect had a strong correlation with initial sulphur content and volume of flux addition. The regression analysis showed that deep desulphurization is easier to be achieved if the initial sulphur content is lower than 30×10-6, or it will be much harder on the contrary.  Compared to  CaO-CaF2 flux, the alloy yield has been improved when using calcium aluminate desulphurization flux.  Related Articles | Metrics Select Analysis of tension measurement data of electrical steeland establishment of closedloop control HE Ke, GAO Yan Electrical Steel    2021, 3 (2): 40-43.   Abstract （120）      PDF（pc） （851KB）（675）       Knowledge map    Save Modern measurement technology and digital management means were used to realize realtime monitoring, recording and abnormal alarm of tension sensor measurement signal. At the same time, modern signal processing and analysis methods were adopted, and empirical mode decomposition （EMD) algorithm was proposed to decompose the tension signal, which can extract and analyze the fault characteristics of the tension sensor online and in real time, and carry out closedloop control. It creates great benefits for detecting and diagnosing the early fault of the sensor and optimizing the quality of electrical steel products. Related Articles | Metrics Select Measures of enhancing the circulate productivity of CSP soaking furnace CHEN Meng, JIANG Nan, CHENG Xi Electrical Steel    2021, 3 (2): 44-48.   Abstract （152）      PDF（pc） （625KB）（473）       Knowledge map    Save The restrict segment existed in CSP soaking furnace were analyzed while CSP plant enhancing the circulate productivity in the soaking furnace.Then the measures to raise the circulate productivity of the CSP soaking furnace were put forward from the respect of reducing the heating time, enhancing the heating efficiency and fasting roller cleaning. Related Articles | Metrics Select Electrical Steel    2021, 3 (2): 49-53.   Abstract （102）      PDF（pc） （615KB）（295）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2021, 3 (2): 54-57.   Abstract （62）      PDF（pc） （431KB）（238）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2021, 3 (2): 58-61.   Abstract （89）      PDF（pc） （500KB）（260）       Knowledge map    Save Related Articles | Metrics Select Development of cold rolled pole sheet steel DEL550 for hydrogenerators YANG Hongwu, DU Rong, XIE Fen Electrical Steel    2021, 3 (3): 1-.   Abstract （160）      PDF（pc） （1307KB）（457）       Knowledge map    Save A cold rolled pole sheet steel with high strength, high magnetic induction intensity and high dimensional accuracy was developed in this paper. In order to find the proper components and technologies of the cold rolled pole sheet steel, the microstructures, mechanical properties and magnetic properties of the test steels with different components were analyzed. The results showed that the 550 MPa pole sheet steel with the component of C  0.69 %,Si 0.42 %,Mn 1.25 %,P≤0.010 %,S≤0.005 %,Als 0.033 %,Ti 0.088 % and Nb 0.039 % will get the best properties by proper technologies. The microstructure of the steel is ferrite and free cementite with the grain size of grade 12, and the yield strength is more than 550 MPa, and the elongation reaches above 10 %, and the magnetic properties are also excellent with the magnetic induction intensity B50 above 1.50 T. Related Articles | Metrics Select Study on mechanism and control measures of crisp edge defects in low reheating temperature grain oriented electrical steel CAI Haibin, HUANG Dong, HE Longyi, SUN Liang, SUN Yiqiang, LIANG Wen Electrical Steel    2021, 3 (3): 5-.   Abstract （170）      PDF（pc） （1396KB）（529）       Knowledge map    Save By studying the microstructure, phase transformation and mechanical properties of the low reheating temperature grain oriented electrical steel, the mechanism of the production of crisp edge was proposed in this paper. The edge quality of the grain oriented electrical steel has been improved by optimizing the slab load mode and edge heating mode,which was helpful to increase the non-trimming cold rolled rate as well as the finished product rate and reduce the production costs. Related Articles | Metrics Select Effects of laser scribing on core loss and the noise characteristics of grain-oriented silicon steel XIE Wenliang, CHENG Xiangwei, ZHANG Jing, DANG Ningyuan, LIU Min, WU Zhanghan Electrical Steel    2021, 3 (3): 11-.   Abstract （215）      PDF（pc） （1768KB）（624）       Knowledge map    Save The effects of laser scribing on the core loss and noise performance of grain-oriented silicon steel were studied with different input power. The results showed that the core loss of the grain-oriented silicon steel was improved by laser scribing with different input power, and the improvement rate of core loss was more than 10 %. However, the influence of different input power on the noise performance of grain-oriented silicon steel was different. The higher the power was, the greater the depth and width of the notch would get, which increased the internal stress of the steel plate when heated to a higher temperature, and the new closed magnetic domain would lead to decrease the noise performance of the grain-oriented silicon steel. Related Articles | Metrics Select Research and trail production of grain-oriented silicon steel 100HD produced by thin slab continuous casting and rolling YANG Li, SUN Yaping Electrical Steel    2021, 3 (3): 17-.   Abstract （136）      PDF（pc） （661KB）（577）       Knowledge map    Save The grain-oriented silicon steel was produced by thin slab continuous casting and rolling technology in a steel company, and the grain-oriented silicon steel of high magnetic induction was produced by CSP and low temperature heating once cold rolling process. The processes of converter smelting, LF refining, RH vacuum treatment, slab continuous casting and hot rolling were optimized in the production. The whole hot metal smelting process was adopted, and ferrosilicon and tin ingots were added after pre-deoxidation in tapping steel for alloying, and refining slag adjusting agent was used in LF refining process to ensure the effect of top slag submerged arc, and light treatment mode was adopted in RH vacuum treatment to carry out vacuum circulation, and the whole protective pouring process was adopted.These optimizing measures realized to reasonably control the content of N and other components in moten steel and finished products, such as the total oxygen content of slab controlled between 0.000 7 % and 0.002 4 % , and the nitrogen content between 0.007 1 % and 0.008 1 %, which made the grain-oriented silicon steel meet the needs of the next cold rolling process. Related Articles | Metrics Select Research on high grade non-oriented electrical steel applied to high efficient refrigerator compressor ZHANG Zhenhai, BAO Lei, SUN Tao, ZHANG Wenying, ZHAO Haishan, WU Yaoguang Electrical Steel    2021, 3 (3): 21-.   Abstract （126）      PDF（pc） （1255KB）（508）       Knowledge map    Save In order to satisfy the performance requirements of high efficient refrigerator compressor motors， a high grade non-oriented electrical steel product was successfully developed through the processes of composition design, RH refining, continuous casting, hot rolling, single cold reducing, continuous annealing, finish packing and so on. And in magnetic property testing, the iron loss P1.5/50 of the high grade non-oriented electrical steel  was 2.73 W/kg and the magnetic induction B50 was 1.70 T. The finished product has been applied to high efficient refrigerator compressor industry and used to make motor stators. The average iron loss P1.5/50 of the motor stator after annealing was 1.8 W/kg and after the motor stator assembeled into the whole machine, the motor efficiency was more than 86 %. It is proved that the researched high grade non-oriented electrical steel satisfies the performance requirements of high efficient refrigerator compressor motors. Related Articles | Metrics Select Cause analysis of black spot defects on coating surface of non-oriented silicon steel TIAN Jinlong, HUO Lijie, XIE Yu, YANG Xueyan, TU Guopeng Electrical Steel    2021, 3 (3): 25-.   Abstract （195）      PDF（pc） （916KB）（538）       Knowledge map    Save The surface quality of nonoriented silicon steel is one of the important indicators of the product. During the production of a nonoriented silicon steel, the black spot defects appeared on the steel surface had a great impact on the stability of the production line and the product yield. Through macro observation and scanning electron microscopy (SEM), energy spectrum analysis, onsite simulation experiments, etc., the causes of black spots were studied. The results showed that the direct cause of the black spots was related to the "splash" of the coating liquid, and the occurrence of the defects was related to the operating state of the coating machine and the coating roller. Related Articles | Metrics Select Study on correlation of rolling load redistribution of non-oriented silicon steel in CSP line ZHAO Min, JIANG Nan, CHEN Meng, ZHANG Yichen, CHENG Xi Electrical Steel    2021, 3 (3): 29-.   Abstract （130）      PDF（pc） （2959KB）（478）       Knowledge map    Save The output of silicon steel has been continuously improved in CSP plant of Wuhan Iron and Steel Co. Ltd.. Due to the characteristics of the same width rolling, the problem of poor cross section of silicon steel was gradually exposed. In viewing of the existing problem of the poor cross section, the control ability of equal proportion convexity, the roll shifting and the roll wear were analyzed through optimization of the original SMS two load  allocation plan. The results showed that the adjusted process can not only satisfy the condition of good steel plant shape but also get a great improvement on the roll wear, the steel crown, the wedge precision and the cross section control. Related Articles | Metrics Select Study on pickling process of high grade non-oriented silicon steel YI Zhengxin, KUANG Qunyi, XU Yanbo, HE Lihong Electrical Steel    2021, 3 (3): 37-.   Abstract （178）      PDF（pc） （1329KB）（615）       Knowledge map    Save The oxide skin structures of high grade non-oriented silicon steel and carbon steel produced by hot rolling were comparative analyzed. A series of pickling experiments were carried out on a normalizing and pickling production line of silicon steel. The influences of pickling temperature, acid concentration and shot blasting on pickling time and effect were investigated. It is considered that the difficulty in pickling the oxide sheet on the surface of high grade non-oriented silicon steel was due to its special structure. The parameters of pickling process suitable for industrial production of high grade non-oriented silicon steel were given. Related Articles | Metrics Select New technology of annealing coating for electrical steel used in new energy vehicles XU Yanbo, YI Zhengxin Electrical Steel    2021, 3 (3): 43-.   Abstract （161）      PDF（pc） （418KB）（1062）       Knowledge map    Save Based on the product properties and production process requirements of high grade non oriented silicon steel for new energy vehicles, the new technologies of continuous annealing and coating line for electrical steel used in new energy auto in the WISDRI were introduced, such as: thin strip threading and stable operation, efficient cleaning, rapid heating and controlled cooling, uniform coating, intelligent manufacturing. Related Articles | Metrics Select Electrical Steel    2021, 3 (3): 46-.   Abstract （49）      PDF（pc） （632KB）（82）       Knowledge map    Save 高温退火低保温期，采用惰性气体作保护气体能改善被膜质量。惰性气体Ar与H2、N2相比黏度高， Ar气难于侵入钢卷的各层间挤压出水分子，水分子就在钢板层间保持下来，将会进一步促进被膜的生成。之后导入氢气，促进了退火隔离剂MgO的表面活化性，由于钢板层间是湿氢保护气氛，钢板表面的副氧化层中、难于被还原的Fe2SiO4，将与MgO发生反应，生成Fe2xMgxSiO4，又继续形成完善的Mg2SiO4镁橄榄石被膜，在这种条件下所生成的被膜将吸收隔离涂层中的Ti，增强了被膜的强度。 Related Articles | Metrics Select Electrical Steel    2021, 3 (3): 53-.   Abstract （70）      PDF（pc） （506KB）（267）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2021, 3 (3): 58-.   Abstract （57）      PDF（pc） （600KB）（346）       Knowledge map    Save Related Articles | Metrics Select Texture study of hot rolled plate by electric heating for low temperature high magnetic induction grain-oriented silicon steel WANG Ruoping, MAO Jionghui, LIU Jing, JIA Juan, LIU Wenyan, ZHANG Yanwen Electrical Steel    2021, 3 (4): 1-.   Abstract （135）      PDF（pc） （5075KB）（571）       Knowledge map    Save The hot rolled plate of low temperature high magnetic induction grainoriented silicon steel was treated by electric heating. The experimental results showed that the hot rolled sheet with equivalent normalizing plate texture components can be obtained by heating hot rolled sheet from room temperature to  1 000 ℃  with a rate of 55 ℃/s and then cooled which involved maintain 25 s during the cooling process from  1 000 ℃  to 950 ℃. The possibility of adding electric heating devices in the back section of hot rolling mill was discussed according to the experimental results. Related Articles | Metrics Select Introduction of thin gauge grain-oriented electrical steel products of  Baosteel and their application in power transformers SHEN Kanyi, MA Changsong, MU Huaichen Electrical Steel    2021, 3 (4): 7-.   Abstract （293）      PDF（pc） （1332KB）（721）       Knowledge map    Save As the fourth intelligent plant of silicon steel put into production, Baosteel has formed six series,more than 50 brands of grain-oriented electrical steel products, such as P series of high magnetic induction grain-oriented electrical steel, R series of laser scribing grain-oriented electrical steel, G series of ordinary grain-oriented electrical steel,LM series of low noise grain-oriented electrical steel,W/Y/Z series of special coating grain-oriented electrical steel, and HS series of heat resistant grain-oriented electrical steel, which can meet the needs of different customers. In this paper, the application of Baosteel's thin gauge grain oriented electrical steel products, especially B23R075, B20R070 and B18R060 were introduced for power transformer. Related Articles | Metrics Select Effect of acid soluble aluminum content on precipitates of normalizing grain-oriented silicon steel LI Li, JIA Zhiwei, SONG Qingyang, LUO Li, ZHANG Jing, PANG Shufang Electrical Steel    2021, 3 (4): 12-.   Abstract （145）      PDF（pc） （1187KB）（606）       Knowledge map    Save The effect of acid soluble aluminum (Als) content on precipitation behavior of the precipitates from the normalized plate was investigated in high magnetic induction grainoriented silicon steel. The results showed that the precipitates mainly consist of AlN, MnS and compound precipitates of AlN. With the increase of Als content, the amount of precipitates increases, but the average size of precipitates does not change much. The coarse precipitates in the normalized plate are basically compound precipitates, most of which take MnS as the core and AlN is extrapolated on the surface of MnS, while the fine precipitates in the normalized plate are mostly single precipitates. In the normalizing cooling stage, there are many fine AlN particles near the pearlite region because of the precipitation of supersaturated AlN and N near the pearlite region of normalizing plate.  Related Articles | Metrics Select Effect of warm rolling process on texture of Fe 6.5 %Si steel sheet HUANG Jingwen, WU Zhanhan, LUO Zhonghan Electrical Steel    2021, 3 (4): 17-.   Abstract （151）      PDF（pc） （1695KB）（566）       Knowledge map    Save High silicon steel has excellent soft magnetic properties and is an ideal material for  iron cores of medium and high frequency electric motors. 6.5 %Si steel sheet with a thickness of 0.30 mm was prepared by double roll continuous casting-hot rolling-warm rolling-annealing process. The effects of different warm rolling processes on the texture and final magnetic properties of 6.5 %Si sheet rolling and annealing were studied by X-ray diffractometer and magnetic measurement. The results showed that the lower the warm rolling temperature is, the more favorable the formation of {001}〈0vw〉 texture is in the core of the sheet. The samples rolled at 600 ℃ and 500 ℃ contain mainly γ texture after annealing, while the samples rolled at 400 ℃ contain both γ texture and η texture with higher strength after annealing, and the corresponding magnetic induction value is high. At the same annealing temperature, {001}〈0vw〉 texture does not form in the two step rolling process, and η texture does not form in the sample after annealing, and the magnetic induction of the sample is lower than that of the one step rolled sample. Therefore, low temperature rolling is conducive to forming favorable η texture and improving magnetic induction of samples during annealing. Related Articles | Metrics Select Effect of rare earth Y on microstructure and magnetic properties of 4.5 % Si non-oriented silicon steel sheets#br# ZHAO Haibin, QIN Jing, ZHANG Yinghui, WANG Zhigang Electrical Steel    2021, 3 (4): 23-.   Abstract （118）      PDF（pc） （3135KB）（553）       Knowledge map    Save Four kinds of non-oriented 4.5 % Si steels with different mass fraction of Y (0, 0.006 %, 0.012 %, 0.016 %) were analyzed for the effects of Y on microstructure and magnetic properties of annealed sheets. The results showed that Y effectively modified nano scale square TiN and Al2O3 inclusions into spherical TiO2, Al2O3 and Y2O2S composite inclusions, coarsened the size of inclusions and reduced the number of fine inclusions dispersed in 0-500 nm. Thus, adding appropriate amount of Y increased the grain growth rate and reduced the activation energy of grain boundary migration, and the interaction of magnetic domain with grain boundary and inclusions led to the decrease of loss and iron loss. However, excessive Y increased the fine inclusions, enhanced the effect of pinning grain boundary and reduced the grain size of the annealed sheets. The {111} oriented grains nucleated and grew preferentially around the fine inclusions during annealing, the addition of rare earth Y reduced the inclusion density, and the enrichment of rare earth Y at the grain boundary reduced the nucleation advantage of {111} grains at the grain boundary, so the addition of rare earth Y weakened the strength of γ texture. The results showed that the sample containing 0.012 % Y has the highest B50 (1.655 T) and the lowest iron loss at each frequency, P1.0/50=1.41 W/kg, P1.0/400=19.28 W/kg and P1.0/1000=77.69 W/kg respectively. Related Articles | Metrics Select Research on corrosion behavior of non-oriented electrical steel 50W800 in simulated marine environment XIE Kai, LI Ciying, WU Gaoliang, SONG Wei, WU Zejiao, XIANG Jiming, ZHOU Herong Electrical Steel    2021, 3 (4): 32-.   Abstract （136）      PDF（pc） （2973KB）（623）       Knowledge map    Save The corrosion behavior of 50W800 non-oriented electrical annealed steel under neutral salt spray condition was studied, and the causes of corrosion were analyzed.Metallographic microscope, scanning electron microscope (SEM) and energy spectrum analysis (EDS) were used to analyze the microstructure of the annealed samples, and the macroscopic and microscopic corrosion morphology of the 50W800 annealed samples of non-oriented electrical steel were analyzed to determine the corrosion reasons of the annealed plates.The microstructure analysis results showed that the metallographic structure of the 50W800 annealed sample of the nonoriented electrical steel is equiaxed crystal ferrite structure. The typical inclusions in the 50W800 annealed sample of the nonoriented electrical steel include AlN inclusions, Al2O3 inclusions, Al2O3-MnS inclusions and MgO-Al2O3-MnS inclusions.The results of corrosion behavior process showed that there are three kinds of rust spots with different morphology in the corrosion process of 50W800 test plate of non-oriented electrical steel, and the change process of rust spots with different morphology is different within 60 minutes of salt spray box corrosion.According to the analysis of corrosion process and cause of 50W800 test sample of non-oriented electrical steel, the main reason for corrosion of sample is the change of corrosion morphology caused by inclusions Al2O3, Al2O3-MnS and MgO-Al2O3-MnS.Moreover, the corrosion area caused by Al2O3-Mns inclusions above 10μm increases with the increase of corrosion time. Related Articles | Metrics page Page 1 of 2 Total 66 records First page Prev page Next page Last page