Volumn Content

Electrical Steel 2024 Vol.6 Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Electrical Steel    2024, 6 (1): 0-.   Abstract （58）      PDF（pc） （500KB）（46）       Knowledge map    Save Related Articles | Metrics Select Microstructure and texture evolution during temper rolling and annealing of Fe-3 %Si steel sheets prepared by planar flow casting#br# ZHANG Ning, XU Jiangjie, TU Yang, ZHOU Xiaozhou, ZHANG Bo, MENG Li Electrical Steel    2024, 6 (1): 1-.   Abstract （92）      PDF（pc） （1196KB）（232）       Knowledge map    Save In this paper, Fe-3 %Si solidified steel sheets produced by planar flow casting were subjected to temper rolling and annealing processes, so as to explore short process fabrication of ultra-thin non-oriented electrical steel, meanwhile the microstructure and texture evolution during light rolling and annealing were studied. Results showed that there are major columnar grained structures in solidified sheets, and the fraction of {100} grains is higher than 30 %, indicating beneficial {100} texture in the sheets. After light rolling, low orientation change and in grain orientation split are shown in most of the grains, and deformation behaviors in different grains are shown to be dependent on their initial orientations. The lower stored deformation energy in {100} oriented grain contributes to heritage advantage after annealing, thus beneficial  {100} grains in annealed samples still occupy more than 30 % area. Fine grains with non {100} orientations increase after annealing, so as to reduce the average grain size and weaken {100} texture to some extent. Related Articles | Metrics Select Analysis on the differences in primary recrystallization microstructure and texture of low-temperature nitriding grain-oriented#br# silicon steel with different thicknesses#br# CAO Bo, YANG Ping, SHAN Zhongyu, GU Xinfu Electrical Steel    2024, 6 (1): 6-.   Abstract （93）      PDF（pc） （3795KB）（261）       Knowledge map    Save The EBSD technique was used to study whether differences in primary grain sizes and textures exist in successfully produced grain-oriented silicon steels with thicknesses of  0.27 mm, 0.23 mm, 0.20 mm. Results showed that the average grain sizes of primary recrystallized sheets with three kinds of thicknesses are all in the range of 20-22 μm when determined from the transverse sections, basically close to 21.4 μm. In 0.27 mm thick sheets, the average grain size in sheet center is larger than that in the surface region. As sheet thickness decreases, the average grain sizes in surface region gradually approach to those in sheet center. At the same time, the primary recrystallization texture is enhanced, namely, the main texture components {114}〈481〉, {111}〈112〉 and {100}〈021〉 are all enhanced to a certain extent, among which the intensity of {114}〈481〉 texture is significantly higher than other textures. The area fractions of {114}〈481〉 and {111}〈112〉 grains increase, and those of Goss and {210}〈001〉 grains decrease. Among these three kinds of thicknesses, the area fractions of Goss, {210}〈001〉 and {114}〈481〉 grains in the surface region are all higher than those in the center region, while the fraction of {100}〈021〉 and Brass grains are lower than those in the center region. Similar to the increase in texture intensity with reduced sheet thickness, the {114}〈481〉 and {111}〈112〉 textures in the surface and center regions, as well as the {100}〈021〉 texture in the central layer region are all significantly enhanced. Related Articles | Metrics Select Study on the effects of different normalization cooling processes on grain-oriented silicon steel#br# SHI Chao, SONG Cheng, XIANG Li, LI Jianjun Electrical Steel    2024, 6 (1): 15-.   Abstract （111）      PDF（pc） （4650KB）（250）       Knowledge map    Save The effects of three common cooling rates, namely air cooling, a cooling rate of  40  ℃/s, and water cooling, on the hot-rolled plate of a grain-oriented silicon steel were studied from the differences of microstructure, texture, and precipitate phases. As the normalizing cooling rate increased, the number of grains on the normalized plate surface increased, while the grain size gradually decreased. This would promote the transformation of austenite phases in the steel into metastable phases. After normalization, there was no significant change in the texture of the hot-rolled plate; all experimental steels exhibited a strong  α fiber texture, a weak γ fiber texture, and a weak Goss texture along the plate thickness direction. In addition, the size and volume fraction of precipitate phases in the plate decreased as the cooling rate increased. Related Articles | Metrics Select Application and prospects of grain oriented silicon steel in electric motor LU Xusheng, LI Yangyang, MA Deji, LI Zhiye, ZENG Lubin, PEI Ruilin Electrical Steel    2024, 6 (1): 23-.   Abstract （160）      PDF（pc） （1654KB）（321）       Knowledge map    Save In order to further reduce the iron loss and improve the performance of the motor, the application of grain oriented silicon steel instead of nonoriented silicon steel to motors has become a new research field. This paper introduced the technical development of grain oriented silicon steel applied to motors, summaried the influence of each technology on motor performance, analyzed the problems existing in the application of oriented silicon steel motor and its future development trend. It provides reference for the development direction of high efficiency, high power density and low loss in China’s motor industry. Related Articles | Metrics Select Quality evaluation of grain-oriented silicon steels for 220-1 000 kV power transformers CHENG Ling, ZHANG Yanbing, MA Guang, HE Chengxu, HAN Yu, CHEN Yunxiang Electrical Steel    2024, 6 (1): 30-.   Abstract （105）      PDF（pc） （1554KB）（454）       Knowledge map    Save Quality supervision and evaluation were conducted on the grian-oriented (GO) silicon steel used for power transformers/reactors in the 220-1 000 kV substation project newly built and expanded by State Grid Corporation of China from 2020 to 2023. A total of 175 substation projects, 24 transformer manufacturing enterprises, and 3 GO steel production enterprises were involved. Based on the technical conditions and testing method standards of GO steels, over 20 000 pieces of GO steel samples, including 23 grades such as 20QH070, 23QH075, 27QH085, and 30QH100, were randomly inspected. Overall, the failure rate of performance has been decreasing year by year, and the problems in magnetic properties, coating performance, and appearance quality of batch supplied GO steels have been identified. By continuously conducting quality assessments of GO steels, we have provided strong support for strengthening the source control of power transformer quality and helping to build an inherently safe power grid.  Related Articles | Metrics Select Influence of rare earth treatment on the inclusions in high-grade non-oriented silicon steel SONG Cheng, XIANG Li, SHI Chao, LI Jianjun Electrical Steel    2024, 6 (1): 39-.   Abstract （98）      PDF（pc） （855KB）（197）       Knowledge map    Save The present study aimed to investigate the effect of different rare earth contents on inclusions in high-grade non-oriented silicon steel through industrial experiment. The results revealed that at a compound rare earth content of 0.002 1 %（mass fraction）, the rare earth elements predominantly formed (La, Ce)AlO3 rare earth inclusions.These inclusions serve as deoxidizers and modifiers, transforming steel Al2O3 inclusions. With an increase in the rare earth content in steel, the formation of rare earth inclusions shifts towards (La, Ce)AlO3(La, Ce)2O2S and (La, Ce)2O2S inclusions. These inclusions mainly reduce the formation of sulfides in the steel. However, their influence on the numerous Al2O3 inclusions formed during temperature drops and secondary oxidation in steel is limited. Consequently, this leads to a significant increase in the number density of Al2O3 inclusions in steel with a high rare earth content. Furthermore, rare earth treatment induced notable spheroidization of inclusions in casting billets. However, during the subsequent hot-rolling process, minimal differences were observed in the average aspect ratio of inclusions between conventionally treated plates and those treated with rare earth. Therefore,the primary factor influencing the aspect ratio of inclusions is the relevant process parameters of the rolling process. Related Articles | Metrics Select Research on the development trend of thin gauge and very-thin/ultra-thin gauge electrical steel#br# CHEN Zhuo Electrical Steel    2024, 6 (1): 46-.   Abstract （151）      PDF（pc） （661KB）（334）       Knowledge map    Save In recent years, the rapid development of the global new energy vehicle market, coupled with the rapid advancement of self-adhesive coating technology, has led to an increasing demand for thin gauge electrical steel. This is especially true for the high-end electric motor market, such as high-speed motors and micro motors, where the rapid progress in self-adhesive coating technology has greatly driven the demand for very-thin/ultra-thin gauge electrical steel. Currently, many electric motor manufacturers for new energy vehicles are seeking to purchase self-adhesive coated electrical steel. Numerous electrical steel companies, research institutions, coating companies, and core manufacturers are actively developing self-adhesive coating and die-cutting techniques. From this, we can observe a trend in the development of thin gauge and very-thin/ultra-thin gauge electrical steel.This article focused on elaborating on thin gauge and very-thin/ultra-thin gauge electrical steel, their current production status, development, and demand trends.  Related Articles | Metrics Select Analysis of material selection of amorphous alloy and silicon steel for PMSM at different speeds YAN Changhao, FAN Qinglin, MA Deji, HU Haiyang, WANG Lihui, ZENG Lubin, PEI Ruilin Electrical Steel    2024, 6 (1): 52-.   Abstract （95）      PDF（pc） （1203KB）（250）       Knowledge map    Save The magnetic properties of amorphous materials and silicon steel were introduced and simulated separately in high-speed motors. Based on the simulation results, the efficiency of the two materials and the differences in iron loss at different speeds were compared and analyzed. And the changes in the iron loss of amorphous materials and silicon steel under different rotational speeds were studied. The results showed that amorphous materials have obvious advantages in high-speed motors, providing material selection suggestions for motors under different rotational speed conditions. Related Articles | Metrics Select Causes and control measures of flying shear steel sticking in continuous annealing line of silicon steel TANG Jingtao, CHEN Xiaoning, LUO Jianhong, LI Wei Electrical Steel    2024, 6 (1): 59-.   Abstract （76）      PDF（pc） （589KB）（222）       Knowledge map    Save The shear blade of an export crank type fly shear in a silicon steel continuous annealing unit was unable to fall back to the initial low position normally during the continuous shearing,and collided with the plate and strip head in motion,causing the fault of steel sticking.The reason was analyzed in this paper, and the improvement and control method to solve the corresponding failure of flying shears were put forward, which solved the fault of the fly shear, ensured the continuity of stable production, improved the productivity and conformity of the continuous annealing unit. The application effect is good. Related Articles | Metrics Select Electrical Steel    2024, 6 (2): 0-.   Abstract （85）      PDF（pc） （525KB）（48）       Knowledge map    Save Related Articles | Metrics Select Research progress of high-temperature annealing process  for grain-oriented silicon steel#br# PENG Xiaoqian, FAN Gangqiang, TAN Jianfen, YANG Qun, LIU Qi Electrical Steel    2024, 6 (2): 1-.   Abstract （128）      PDF（pc） （2013KB）（333）       Knowledge map    Save High-temperature annealing is a crucial process in the production of cold-rolled grain-oriented silicon steel, and extensive research has been conducted by practitioners over several decades, leading to significant advancements. The high-temperature annealing equipment, process, and microstructure growth mechanism of grain-oriented silicon steel were summarized based on the characteristics of the process and existing domestic and foreign researches. Furthermore, potential directions for future research in the high-temperature annealing process were proposed. Related Articles | Metrics Select Influence of wire cutting and laser cutting processes on magnetic properties of electrical steel for motors#br# GE Jiahao, LI Weizhou, MA Deji, ZENG Lubin, PEI Ruilin Electrical Steel    2024, 6 (2): 10-.   Abstract （98）      PDF（pc） （2863KB）（305）       Knowledge map    Save The cutting process will lead to the deterioration of the magnetic properties of the electrical steel, causing changes in the microstructure of the edge of the electrical steel. The cutting experiment was carried out on the non-oriented electrical steel sheet, and the effects of wire cutting and laser cutting processes on the magnetic properties of electrical steel were studied. The magnetic properties of wire-cut and laser-cut electrical steels were tested by using the test method of annular specimens, and the material model was constructed based on the measured data, and the material model was combined with the motor model under actual working conditions, and the motor loss was verified by simulation. The results showed that the wire cutting process has little effect on the magnetic properties of electrical steel, and the loss of electrical steel in the wire cutting process for motors is low. Related Articles | Metrics Select Cause analysis and process improvement of cold-rolled broken strip of silicon steel#br# SHU Zeteng, HUA Xiaojie, BAI Lu, YAO Xinyu, YE Qin, DONG Xiangyun, YAN Chengliang Electrical Steel    2024, 6 (2): 17-.   Abstract （129）      PDF（pc） （2795KB）（234）       Knowledge map    Save The cause of cold-rolled broken strip of silicon steel was analyzed, so as to further improve the preparation process of silicon steel and reduce the probability of cold-rolled broken strip. The experimental results showed that the contents of brittle inclusions such as AlN and Al2O3 in the fractured part and unfractured part of cold-rolled broken strip are respectively 26.03 % and 29.65 % higher than those of the qualified samples, while the contents of plastic inclusions such as sulfides and complex nitrogen sulfides are 64.75 % and 56.14 % lower than those of the qualified samples. During the rolling process, brittle inclusions will form gaps around them, and these cracks will form cracks, forming long cracks under the action of rolling force, and eventually causing band breakage.In order to reduce the belt breakage, 0.03 %~0.05 % Sn element can be added to reduce the proportion of brittle inclusions in the inclusions, and meanwhile extend the duration of the argon blowing station during 2~3 min smelting, which can make the inclusions evenly distributed, and prevent the accumulation of brittle inclusions, and ultimately reduce the probability of cold-rolled broken strip. Related Articles | Metrics Select Effects of annealing methods on the magnetic permeability of 0.30 % Si non-oriented silicon steel#br# QI Xuan, DAI Xiaohua, SHI Lifa, PEI Yinghao, XIA Xuelan, LIU Qingsong Electrical Steel    2024, 6 (2): 23-.   Abstract （85）      PDF（pc） （2587KB）（175）       Knowledge map    Save The effects of cover annealing, continuous annealing, and combinations of different annealing methods on the magnetic permeability of 0.30 % Si non-oriented silicon steel were studied. The results showed that the higher cover annealing temperature (≥680 ℃) can obtain a higher permeability of μ1.0 (≥5 800 Gs/Oe), and combined with continuous annealing (≥790 ℃), it can obtain lower iron loss and higher permeability. The lower the first continuous annealing temperature is, the higher the improvement in various magnetic properties of the finished product will be, and under the condition of the second continuous annealing of 830 ℃, the magnetic induction of the finished product is basically stable. The increase of the magnetic permeability is not obvious in second lowtemperature continuous annealing, and the magnetic permeability is greatly improved when the second continuous annealing temperature above 770 ℃. On the whole, the better magnetic performance of the finished product is obtained in the methods of 680 ℃ cover annealing + 830 ℃ continuous annealing and the finished product + 770 ℃ continuous annealing. Related Articles | Metrics Select Tension optimization in field-weakening region of the tension reel of silicon steel decarbonization annealing line#br# LIU Peidi, SUN Jun, XIONG Jinle Electrical Steel    2024, 6 (2): 31-.   Abstract （62）      PDF（pc） （1685KB）（248）       Knowledge map    Save Due to the recent strong demand for silicon steel market, the continuous annealing lines which have been in operation for 10 years have to increase the speed and improve the quality improvement. Because of the single layer of silicon steel getting thinner and thinner, the yield rate and the concession rate of the whole coiling process were more and more obvious affected by the coiling tension. By studying the principle of tension control and tension optimization schemes, a practical tension model for strip coiling was established, which gradually find out the torque accuracy and linearity of the asynchronous motor of the tension reel in weak magnetic region. The optimizations of the motor drive (inverter) and the PLC program make the torque accuracy (winding tension) meet the requirements of the coiling process. Related Articles | Metrics Select Process parameter optimization of silicon steel based on neural network and particle swarm optimization (PSO) algorithm#br# CAI Quanfu, HE Lihong, WANG Zhijun, YAO Wenda, OUYANG Fan, LIAO Jingyuan, WANG Sheng, LIU Chuanxing , LIU Qingjie Electrical Steel    2024, 6 (2): 37-.   Abstract （65）      PDF（pc） （712KB）（175）       Knowledge map    Save A process parameter optimization strategy for reducing silicon steel iron loss was proposed by combining BP neural network and particle swarm optimization (PSO) algorithm. Firstly, a BP neural network was used to establish a prediction model for silicon steel iron loss, which has high fitting and prediction accuracy. Then, in terms of optimizing process parameters, the BP neural network prediction model was used as the fitness function, and the furnace temperatures of each section of the continuous annealing RTF furnace were selected as optimization variables. PSO algorithm was used to optimize these process parameters. The results showed that using BP neural network and PSO algorithm to optimize some process parameters can significantly reduce the iron loss of silicon steel, which has certain guiding significance. Related Articles | Metrics Select Research on pressure control of inner cover of high temperature ring annealing furnace ZHENG Hanchao, HAO Xiaopeng, XIAO Huiming, YANG Haisheng, WANG Chenggang, WANG Xu, MA Songxin Electrical Steel    2024, 6 (2): 41-.   Abstract （88）      PDF（pc） （672KB）（152）       Knowledge map    Save The working principle of the inner cover pressure control system of silicon steel high temperature ring annealing furnace was described in detail. According to the operational experience of the operators in the actual production process and some actual situations encountered in production, the problems encountered in the field operation were sorted out, and the inner hood pressure predetection control method and operation specifications were formulated to realize the automatic early warning technology of the inner hood pressure of the high temperature ring annealing furnace, which effectively improved the pass rate of the inner hood pressure. Related Articles | Metrics Select Rapid analysis of elements in ferrosilicon alloys by fusion sample preparation and X-ray fluorescence method GUO Yan, QI Yu, GUAN Hui, LIU Lirong Electrical Steel    2024, 6 (2): 44-.   Abstract （52）      PDF（pc） （454KB）（114）       Knowledge map    Save Aiming at the problems of complicated operation and low efficiency of traditional chemical analysis methods for the analysis of ferrosilicon alloy element content, the fusion sample preparation -X-ray fluorescence analysis method was developed and established. The results showed that using lithium carbonate melting agent to pretreat ferrosilicon alloy and melting at 1 050 ℃×15 min could avoid the damage of high temperature ferrosilicon sample to the platinum crucible, and the molten sample composition was uniform. The correlation coefficients of the analysis curves for ferrosilicon alloy elements by X-ray fluorescence analysis were all above 0.99, which were consistent with the standard sample results and the traditional national standard method, and the reproducibility of multiple analyses was within the tolerance range.Therefore, the analysis results were accurate and reliable. More importantly, a single analysis could quickly characterize the content of each element in ferrosilicon alloy. Related Articles | Metrics Select Handling of DC bus voltage imbalance fault of MV7000 neutral point clamped three-level inverter in Sengimir rolling mill SUN Jun, LIU Peidi, DING Mengyu, TAO Guilin Electrical Steel    2024, 6 (2): 48-.   Abstract （71）      PDF（pc） （2250KB）（114）       Knowledge map    Save A Sengimir rolling mill in the silicon steel department uses GE's MV7309 medium voltage inverter as the main drive. Since it was put into operation, the inverter has had several trip accidents caused by the difference between the positive and negative voltages on the DC side of the inverter of the right winder greater than the threshold, which affected the production efficiency. Starting from the NPP type topology and DC voltage regulation mode adopted by the inverter, this paper analyzed and gradually investigated the various causes that may cause the positive and negative voltage imbalance on the DC side, and completely solved the fault of DC positive and negative voltage imbalance of the right coiling inverter. The treatment of similar faults has strong reference significance. Related Articles | Metrics Select Electrical Steel    2024, 6 (2): 53-.   Abstract （65）      PDF（pc） （1464KB）（109）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2024, 6 (3): 0-.   Abstract （59）      PDF（pc） （509KB）（40）       Knowledge map    Save Related Articles | Metrics Select Effect of nozzle size on microstructure and properties of Fe-6.5 % Si high silicon steel ribbon#br# FU Weijun, HUA Fu’an, DENG Daowei, LI Jianping Electrical Steel    2024, 6 (3): 1-.   Abstract （70）      PDF（pc） （2165KB）（170）       Knowledge map    Save The effects of nozzle sizes (Φ2 mm, Φ1.5 mm, Φ1 mm and Φ0.7 mm) on the microstructure and properties of Fe-6.5 % Si high silicon steel ribbon during rapid solidification were studied. The results showed that with the decrease of nozzle size, the ordered phase decreases, the continuous length of ribbon increase obviously, but the thickness and width of ribbon decrease, the grain size decreases, and the microhardness decreases. The saturation magnetization (Ms) of ribbon decreases gradually with the decrease of nozzle size, and the coercivity (Hc) increases gradually, but the magnetic properties do not change much overall. The quality of the high silicon steel ribbon made under the Φ1mm nozzle is better. Related Articles | Metrics Select Texture evolution of medium temperature copper-bearing oriented silicon steel during secondary cold rolling#br# ZHANG Chi, HUA Xiaojie, BAI Lu, SHU Zeteng, YAO Xinyu, YE Qin, DONG Xiangyun Electrical Steel    2024, 6 (3): 9-.   Abstract （70）      PDF（pc） （3169KB）（140）       Knowledge map    Save The textures of medium temperature reheated grain oriented silicon steel containing copper during decarburization annealing and secondary cold rolling were quantitatively analyzed by EBSD technique, and the evolution of textures and plastic deformation during different passes of secondary cold rolling was studied. The results showed that {111}〈112〉texture, {111}〈110〉 texture and {112}〈110〉 texture are the main texture components in decarburization annealing and secondary cold rolling. In the surface and subsurface layer, the volume fraction of {111}〈112〉 texture and {111}〈110〉 texture increases with the increase of cold rolling passes, while the volume fraction of {112}〈110〉 texture increases at first and then decreases with the increase of cold rolling passes. Different from other positions, the {112}〈110〉 texture occupies the highest volume fraction in the central layer, and when the cumulative deformation is higher than 58 %, it transforms to the {111}〈110〉 texture. The {001}〈110〉 texture increases after the first cold rolling, and then tends to be stable with the increase of cold rolling pass, but the texture volume fraction of the central layer is higher than that of other positions. With the increase of secondary cold rolling passes, the geometric dislocation density increases, the degree of plastic deformation increases, and the geometric dislocation density of the surface layer and the subsurface layer is higher than that of the central layer. Related Articles | Metrics Select Study on laser welding performance of chromium free environment friendly coating for non-oriented silicon steel#br# DAI Xiaohua, LU Tianlin, ZHAN Yungao, SHI Lifa Electrical Steel    2024, 6 (3): 16-.   Abstract （59）      PDF（pc） （1640KB）（158）       Knowledge map    Save The effects of coating thickness, coating type, and welding process on the welding performance of non-oriented silicon steel were investigated through metallographic microscopy and electron backscatter diffraction (EBSD).The results indicated that：under the conditions of this experiment, the coating thickness was directly proportional to the percentage of welding foaming area, and the organic matter in the coating was the main factor affecting welding foaming. During the welding process, the microstructure gradually grows from equiaxed grains to columnar grains, ultimately forming larger and more uniform large grains. Related Articles | Metrics Select Production practice of non-oriented silicon steel in FTSR production line LI Dejun, GAO Zhenyu, ZHANG Bing, ZHU Rongxin Electrical Steel    2024, 6 (3): 21-.   Abstract （75）      PDF（pc） （1358KB）（134）       Knowledge map    Save The production practice of non-oriented silicon steel on FTSR production line was introduced in this paper, which can save energy and reduce carbon by up to 30 %. Adopting low-temperature heating technology for slab below 1 100℃ to save energy, emissions were reduced, and the solid solution and precipitation of the second phase particles were controlled. A reasonable hot rolling process has been developed, which ensures the driving force for recrystallization of hot rolled coils through high finishing and coiling temperature, forming more favorable textures for electromagnetic performance. The produced non-oriented silicon steel has excellent electromagnetic properties and good profile. Related Articles | Metrics Select Research on influence of interference fit on splicing motor's performance XU Shibo, TIAN Baozhi, MA Deji, WANG Lihui, ZENG Lubin, PEI Ruilin Electrical Steel    2024, 6 (3): 26-.   Abstract （66）      PDF（pc） （1118KB）（96）       Knowledge map    Save In order to ensure the overall strength of the stator, the assembly method of interference fit is mostly adopted between the stator tooth and stator yoke of the splicing motor, and the stress generated by this fitting method on the silicon steel sheet will affect the performance of the motor. In this paper, through the finite element simulation analysis and experimental verification method, the performances were compared on the motors respectively using two kinds of fit modes of interference fit and gap fit between tooth part and yoke part, and the influence law of compressive stress on the electromagnetic performance of silicon steel was obtained. Related Articles | Metrics Select Analysis and control of emulsion residue on electrical steel surface of single stand cold rolling mill WANG Xiaolei, LI Dejun, ZHU Rongxin Electrical Steel    2024, 6 (3): 31-.   Abstract （90）      PDF（pc） （667KB）（154）       Knowledge map    Save In response to the increasing occurrence of residual quality defects resulting from emulsion on the surface of electrical steel chilled strip, a field investigation was conducted. The working efficiency of equipment was enhanced through process parameter debugging and modification. Aging equipment pipelines were replaced to minimize emulsion pollution caused by running, bubbling, dripping, and leaking. Additionally, a compressed air purging device was added to improve the capacity of the purging system. By installing splash guard and reducing purging difficulty, the emulsion spots have been resolved. This improvement enhanced the surface quality of strip steel and reduced fuel consumption. Related Articles | Metrics Select Suppression of looper vibration in silicon steel heat treatment lines LIU Peidi, SUN Jun, XIONG Jinle Electrical Steel    2024, 6 (3): 35-.   Abstract （60）      PDF（pc） （1195KB）（165）       Knowledge map    Save In the process of improving the production capacity and operating speed of old silicon steel heat treatment units, due to the fact that most units far exceed the original design speed limit, the stability of the looper was greatly affected, resulting in significant tension and speed vibration of the strip steel in the looper. By analyzing the principle of indirect tension control of the looper, a looper vibration suppressor was designed based on the feedforward principle, which effectively suppressed the problem of looper vibration and was applied to similar units with significant results. Related Articles | Metrics Select Automatic coiling on the twenty high rolling mill coiler using laser rangefinder and visual recognition SUN Jun, ZHENG Wenjun, LIU Peidi, LU Wei, WANG Chaolei, DING Mengyu Electrical Steel    2024, 6 (3): 40-.   Abstract （54）      PDF（pc） （1196KB）（163）       Knowledge map    Save In viewing of the problems of low accuracy and low efficiency in existing automated winding systems, a new method of automatic coiling on the twenty high rolling mill coiler was proposed in this paper based on laser rangefinder and visual recognition. Firstly, the diameter of the material taken by the coiling machine is measured in real-time using a laser rangefinder, providing accurate data on the width of the steel coil. The diameter of the steel coil is obtained through the laser rangefinder and the car lifting encoder. Then, through visual recognition technology, the inner diameter of the steel coil and the core shaft of the coiling machine are compared, and the height deviation value of the steel coil is accurately adjusted to increase the success rate of automatic coiling. Related Articles | Metrics Select Analysis and improvement of cracking in weld joint of walking beam base CHEN Mengtao, CHEN Liwei Electrical Steel    2024, 6 (3): 45-.   Abstract （45）      PDF（pc） （661KB）（135）       Knowledge map    Save The weld joint tearing fault on walking beam base was analyzed and calculated, and the corresponding improvement methods were proposed in this paper. The practice showed that these methods can improve the weld joint strength of the walking beam base, and can provide an analysis and calculation method for the weld joint strength verification of similar welded structural components. Related Articles | Metrics Select Electrical Steel    2024, 6 (3): 49-.   Abstract （59）      PDF（pc） （510KB）（96）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2024, 6 (3): 55-.   Abstract （51）      PDF（pc） （542KB）（84）       Knowledge map    Save Related Articles | Metrics Select Electrical Steel    2024, 6 (4): 0-.   Abstract （66）      PDF（pc） （514KB）（38）       Knowledge map    Save Related Articles | Metrics Select Current status and development direction of electrical steel in China ZHANG Fengquan, ZHANG Weilin, SUN Wenquan Electrical Steel    2024, 6 (4): 1-.   Abstract （102）      PDF（pc） （2417KB）（272）       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 Select In-situ EBSD study on the texture evolution of normalizednonoriented silicon steel at 900 ℃ Electrical Steel    2024, 6 (4): 9-.   Abstract （61）      PDF（pc） （3757KB）（134）       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 Select 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 （79）      PDF（pc） （1705KB）（192）       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 Select 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 （73）      PDF（pc） （4188KB）（169）       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 Select 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 （68）      PDF（pc） （1912KB）（142）       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 Select 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 （70）      PDF（pc） （1301KB）（219）       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 page Page 1 of 2 Total 65 records First page Prev page Next page Last page