The differences of the secondary recrystallization behavior of 0.20 mm thick grain-oriented silicon steel at different isothermal temperatures and different heating rates were researched in this paper, focusing on the difference of the orientation of secondary recrystallization grains at different temperatures. The microstructures of the TG-CRGO were investigated by electron back-scattered diffraction in this study. The percentage of secondary recrystallization, the change of matrix grain sizes and orientations, and the relationship between the deviation of secondary recrystallized grain orientation to Goss orientation and its grain size were determined. The results showed that increasing the heating rate would delay the start time of secondary recrystallization and slow down the progress of secondary recrystallization; increasing the isothermal annealing temperature would promote the inhibitor ripening and accelerate the progress of secondary recrystallization. In addition, the matrix grains with {114} 〈481〉 orientation were observed to have a significant hindering effect on the growth of secondary grains due to its growth advantage.  Low heating rate and low isothermal annealing temperature (1 030 ℃) were favorable to the formation of sharp Goss texture in the progress of secondary recrystallization. As at this condition, the larger the size of secondary grains, the lower deviation angle to Goss orientation is. 

High permeability grain-oriented silicon steel is a very important electromagnetic material, and its magnetic properties depend entirely on the sharpness of the Goss texture. The secondary recrystallization process of Goss grains is affected by many factors, but there are relatively few studies on the influence of the thickness of the matrix on the primary recrystallization, which leads to the imperfect understanding of the secondary recrystallization process of Goss grains. To solve the above problems, the primary recrystallization matrices of 0.23 mm and 0.27 mm thickness were studied in this study. Based on the experimental results, it was found that the grains in the 0.23 mm-thick primary recrystallization sample were finer than that in the 0.27 mm-thick oriented silicon steel primary recrystallization matrix; and the γ(〈111〉//ND) and {411}〈148〉 textures were stronger in 0.23 mm-thick primary recrystallization sample, and the inhibitor after nitriding was finer and more uniform due to more grain boundaries. The secondary recrystallization of Goss grains in 0.23 mm sample started earlier during high temperature annealing. Due to the characteristic that the thickness thinning will make the secondary recrystallization process of Goss grains occur earlier, the grain boundary pinning force of the inhibitor should be appropriately increased for thin gauge products to ensure that Goss grains with accurate internal orientation can prioritize the secondary recrystallization process within an appropriate temperature range.

The microscopic structures and crystal textures of a high magnetic oriented silicon steel were analyzed by OM and XRD.The results showed that:the temperature interval of secondary recrystallization of high magnetic oriented silicon steel is between 1 015 ℃ and 1 030 ℃;the first recrystallized grains grew slowly before the Goss grain grows abnormally，and the initial grain size at 1 010 ℃ is 25.9 μm;the primary grain texture is concentrated at {113}，and the abnormally grown grains are accurate Goss orientation grains.

The effect of different cold rolling process with high reduction rate of primary cold rolling, critical deformation and moderate reduction rate of secondary cold rolling on recrystallization microstructure,textures and magnetic properties of 3.28 % Si silicon steel were researched. The results showed that the steel in the process of 80 % high reduction rate primary cold rolling had the smallest grain size and better grain uniformity, with the average grain size about 103 μm, textures of mainly {111}〈112〉 and next {111}〈110〉, and better comprehensive performances of better P1.5/50 and better B50 and the smallest anisotropy. In the process of 9 % critical deformation, the grain size was the largest of about 156 μm in average, but some grains did not finish complete recrystallization, so the grain uniformity was the worst, with the textures of mainly {111}〈110〉 and {112} plane texture and the weakest {110}〈001〉 texture, and the worst comprehensive performances of the highest P1.5/50, the lowest B50 and the biggest anisotropy. While in the process of 50 % moderate reduction rate of secondary cold rolling, the steel’s grain size was in middle among the three cold rolling processes of about 112 μm in average, and the grain uniformity was the best, with the textures of mainly {110}〈001〉 and {100} plane texture and the best comprehensive performances of the lowest P1.5/50, the highest B50 and better anisotropy.

Using 2.98 % Si non-oriented silicon steel produced in an industrial field as the experimental material, six different normalizing processes were designed in this paper. The effects of different normalizing temperatures and holding time on the microstructures and surface textures of 2.98 % Si non-oriented silicon steel were studied by metallographic microscope and X-ray diffractometer. The results showed that the microstructures of hot rolled plate were composed of recrystallized grains with fine grain size and elongated deformed grains. The surface textures were dominated by strong Goss texture, and the components of  α  texture and λ  texture were extremely weak. After normalizing at 900 ℃×3 min, some grains were not recrystallized, resulting in the distribution of long strip deformation structure in the central layer, and the average grain size was 59 μm. After normalizing at 1 000 ℃×5 min, the recrystallized grains grew non-uniformly, and the average grain size reached 233 μm. After normalizing at  950 ℃×5 min and 1 000 ℃×3 min, the microstructure uniformity was significantly improved, and the average grain sizes were 132 μm and 143 μm respectively, within the optimal grain size range. The surface textures of the normalized plate were mainly composed of Goss texture and {110}〈112〉 texture, which were mostly inherited from the hot rolled plate with only difference in strength. Increasing the normalizing temperature or prolonging the holding time within a reasonable parameter range can reduce the intensity of the γ  texture.

The electromagnetic properties and mechanical properties of non-oriented silicon steel 50W470 at different angles of deviation from rolling direction were tested and analyzed, and the theoretical model of magnetocrystalline anisotropy was calculated and analyzed. The results showed that the direction deviating from the rolling direction of 0° has the best electromagnetic performance, which is the easiest magnetized direction and has the lowest mechanical strength.The direction deviating from the rolling direction of 50°~60° has the worst magnetic properties, which is the most difficult magnetized direction and has the highest mechanical strength.There are significant differences in texture distribution and strength at various angles deviating from the rolling direction.

In order to study the microstructure and texture of the hot rolled plate of non-oriented silicon steel 50W600 containing Sn and Sb, the smelting and hot rolling tests of 50W600 were carried out in the laboratory pilot test platform. The microstructure of the hot rolling stage was analyzed by optical microscope (OM), and the macro texture was analyzed by X-ray diffractometer. The results showed that with the increase of Sn and Sb content, the thickness of the surface recrystallization layer increased. When the mass fraction of Sn was 0.068 %, the thickness of the surface recrystallization layer was about 0.12 mm. Both Sn and Sb elements played a fine role in the microstructure of non-oriented silicon steel 50W600 hot rolled plate. At the same time, the cubic texture of {001}〈100〉 increased significantly after the addition of Sn and Sb elements, and the strength of Gauss texture {110}〈001〉 increased with the increase of Sn and Sb elements. The optimal contents of Sn and Sb were 0.068 % and 0.072 % respectively.

High temperature bell-type annealing furnace is an extremely important part of the production process of grain-oriented silicon steel. In the early stage of production, the bottom heating resistance belt was fused, which led to the failure of the bottom heating system to operate normally. When the high temperature bell-type furnace was not normally put into the bottom heating system to produce grainoriented silicon steel, it was found that there were some quality defects such as spot-like crystal leakage and large iron loss at the head and tail, which affected the magnetic properties of steel coils. In this paper, through physical and chemical analysis of the fuse site and melt of the resistance belt, and through metallographic detection, electron microscope scanning, chemical composition detection, the content of P in the refractory brick was found exceeding the standard, which led to the electric corrosion reaction with the resistance belt at high temperature stage, resulting in the resistance belt disconnection. 

According to the current development status of new energy vehicles and the required characteristics of driving motors and electrical steels for new energy vehicles, the patents applied by JFE in the field of non-oriented electrical steel for new energy vehicles in recent five years were analyzed and studied, including the patent application characteristics and core patent analysis, to reveal its patent technical categories and technical effects.

Iron core is the heart of a generator. Iron core punching is one of the core manufacturing of a motor. The digital workshop of stator core punching sheet of DongFang Electric Corporation has successfully created a new intelligent manufacturing mode of stator core punching sheet for large clean and efficient power generation equipment. Starting from the necessity of digital and intelligent transformation of enterprises, this paper expounded the development path of intelligent manufacturing transformation of DongFang Electric Corporation in detail, emphatically introduced and analyzed the ideas, objectives, processes and main functions of the construction of digital workshop of stator core punching sheet, as well as the achievements and future development direction of digital workshop construction.