According to the application requirements of high-performance grain-oriented (GO) silicon steel for electical equipments such as power frequency energy saving transformer, medium frequency isolation transformer , and low frequency transformer, the electromagnetic characteristics of 0.10-0.27 mm GO steel under different working frequencies were studied by an arbitrary waveform magnetic field excitation measurement system. Compared with 0.10 mm ultrathin GO steel, 0.18 mm high magnetic induction GO steel has lower core loss in the frequency range of 15-400 Hz. The core loss of 0.18 mm sample is not only lower than that of 0.23 mm and 0.27 mm products in the rolling direction (RD), but also has the advantage of minimum loss in the transverse direction (TD). However, for materials with the same thickness, low loss in RD does not mean low loss in TD. The differences of electromagnetic characteristics of silicon steel with different thickness were analyzed, and the results can support the core materials selection of different types of transformer. Finally, the future development trend of thin-gauge GO steel was prospected in terms of the performance requirements of core materials for power frequency, medium frequency and low frequency electical equipments. 

In response to the increasingly stringent torque density and efficiency of high-performance motors, the performance of traditional soft magnetic materials has been brought to the extreme. The exploration and application of new soft magnetic materials is an important way to improve the performance of motors. Therefore, oriented electrical steels with high magnetic induction and low iron loss along the rolling direction were proposed to the design of the stator teeth of the permanent magnet synchronous motor (PMSM), which was also compared with the traditional non-oriented electrical steel motor. The results showed that compared with the traditional material motor, the torque of the new motor topology can be increased by 3.4 %, the iron loss can be reduced by 18 %, and the overall efficiency of the motor has been improved. It lays a foundation for the application of oriented electrical steel soft magnetic materials in high performance motors.

Using the existing grain-oriented silicon steel hot-rolled sheet as the initial material, the effects of different normalization processes on the microstructure of the grain-oriented silicon steel normalized sheet were comparatively studied by metallographic microscopy. The results showed that the original strip structure of oriented silicon steel was obviously reduced after regularization, and the grains were obviously enlarged and coarsened, especially the grain size of ferrite in the surface layer reached 34 μm, and the normalized plate structure of oriented silicon steel was beneficial to improve subsequent cold rolling and decarburization processes. 

The quality of the grain-oriented silicon steel coil is directly related to the steel's yield. According to the slippage of the coiling tail of the hot-rolled base material of the oriented silicon steel produced by a steel plant, the main reasons for the occurrence were analyzed. With measures such as the adjustment of the lag rate and the adjustment of the center line of the finishing rolling, the tail coil shape of the grain-oriented silicon steel has been greatly improved.

With the implementation of the new energy efficiency grade standard for motors, higher requirements were put forward for silicon steel products. In this paper, combined with the development of small and mediumsized motors and nonoriented electrical steel, the relationship between the loss of motors and the properties of silicon steel was analyzed, and the demand forecast of nonoriented electrical steel after the implementation of the new energy efficiency grade standard was put forward. 

Without electromagnetic stirring and normalizing annealing equipment for the production of high-grade non-oriented silicon steel, the bell furnace annealing equipment was used to produce highgrade 50BW350 non-oriented silicon steel products in BX Steel by formulating reasonable chemical composition and process system. The results showed that the produced 50BW350 non-oriented silicon steel meets the standard requirements with the magnetic induction of  1.70 T and iron loss of 3.1 W/kg, and the mass production of high-grade non-oriented silicon steel 50BW350 is successfully realized in BX Steel. 

A 20 high Sendzimir mill in Silicon Steel Department of Wuhan Iron and Steel Co., Ltd. was retrofitted with Hib Technology In 2016.After that the overcurrent fault of the Sendzimir mill's main drive rectifier occasionally happened in the steel break braking process after high speed rolling.  The structure of the mill's main drive system and the control strategy for steel break braking were introduced in this paper. With the principle of energy feedback rectifier, the cause of overcurrent in the braking process was analyzed and solved eventually.

In this paper, high-speed dynamic machining technology was adopted to explore the influence law of machining surface roughness of high grade silicon steel tensile specimen. The surface response surface method was adopted to design the test, and a prediction model was established. The variance analysis method was used to test the model, and the influencing factors of machining surface roughness were analyzed combined with high-speed dynamic machining theory.The experimental results showed that the spindle speed and its square term had the greatest influence on the roughness of the machined surface, followed by the axial cutting depth, and finally the feed per tooth and its interaction with the spindle speed. The machined surface prediction model established had a high accuracy, which provided a reference for the actual machining production. According to the actual processing conditions, response surface design and dynamic processing theory can be applied to the efficient processing of tensile specimens of other materials. 

The influence factors of the transverse thickness difference of cold rolled silicon steel were studied in this paper. Using the research method of 6 Sigma, the DOE experiment scheme was designed, and the regression model of the thickness difference and four variables were obtained. The optimal value of the thickness difference was obtained by optimizing the variables in the model. On the premise of meeting customers’ requirements of the thickness difference, the intermediate roll shifting and roll profile can be optimized according to the average crown of hot rolling, so as to reduce the amount of cold rolling trimming, avoid the waste of trimming and improve the comprehensive yield of silicon steel.