The practice during RH de-sulphur process of silicon steel observed that de-sulphur effect not only happened by flux addition but also without flux when higher [Al] and [Si] inside the molten steel. Besides, de-sulphur was proved before deoxidation time to time. The last odd phenomenon was the decreasing sulphur content from RH end to tundish. Thermal dynamic calculation helped to find that the RH de-sulphur process would be divided to two stages – before deoxidation and after deoxidation. CS gas was generated by weak reaction between [C] and [S] in the first stage; in steel-slag reaction, SiS gas was generated by [S] and [Si], and complex reactions with [S], [Al], [Si] and [Ca] was conduct in the second stage. Consequently higher contents of [Al] and [Si] played big positive roles in the second stage. Furtherly, gases of CS and SiS formation inside the liquid metal before endpoint of converter bringed some of sulphur out, and then the CS gas would mix with oxygen to generate SO2 when meeting with the continous oxygen supplied in converter and the air on the surface of molten iron. CO2 component in the flux would be bad at carbon pickup control and alloy yield due to reactions with alloy elements as [Al], [Si].

The grain orientation, grain size and shape of electrical steel are closely related to the production processes, and then affect the magnetic properties and surface quality of finished products. After the composition and microstructures of the billet are determined, hot rolling process plays an important role in the magnetic properties and surface quality of finished products, and hot rolling equipments can ensure the implementation of hot rolling processes.In this paper, the hot rolling process equipment and technical progress of main electrical steel enterprises in China were introduced. The process flow, equipment characteristics and main technical parameters of 1 880 mm, 1　580 mm, 1 780 mm and 1 549 mm hot rolling lines were compared and summarized, which provides an important reference for the design and transformation of electrical steel hot rolling production line.

Based on high grade nonoriented silicon steel with Si content of 3.2 % , the influences of annealing time on the iron losses of P1.0/50 and P1.5/50 were studied. The results showed that：with the increase of the annealing time，the iron losses of P1.0/50 and P1.5/50 decreased first and then increased. The iron loss P1.0/50 became the lowest, which was 1.008 W/kg, when the annealing time was 110 s. While the lowest iron loss P1.5/50 was 2.601 W/kg when the annealing time was 90 s. The average grain size increased from 70 μm to 164 μm as the annealing time increased from 50 s to 130 s. The {110}〈001〉 orientation grain was small and much with short annealing heat time,and its texture component strength was high.While when the annealing time increased, the strengths of γ-fiber texture,{100}〈0vw〉 and {110}〈001〉 were increased，but the increasing amplitude was gradually slowed down. At the annealing temperature of 1 000 ℃ and the time 90 s,the Fe-3.2% Si non-oriented silicon steel can obtain excellent properties of low iron losses of P1.0/50 and P1.5/50 and high homogeneity.

Grain-oriented silicon steel（GO） is an important material related to the development of electric power. A fair GO market environment is conducive to the healthy development of Chinese transformation industry chain.According to law, China Ministry of Commerce has created a fair and healthy market environment through AD trade measures for Chinese GO and transformation industry chain. Facing the future, Chinese GO industry has a mission to shoulder. While making progress, we should work with transformer enterprises to lead the upgrading of materials, achieve high-quality development of the industrial chain, and continue to make new contributions to the national ‘double carbon’ strategy.

The basic structure and working principle of the low NOx  type F-L shape radiant tube burner were introduced in this paper. The problems of insufficient heating ability in heating furnace was analyzed. Some effective measures were put forward to shorten the flame length combined with the production practice, and got a satisfied good performance.

This paper comprehensively analyzed the significance of the development of green transformer, and briefly introduced the advantages of the open threedimensional wound core dry-type transformer green manufactured by Guangdong Open Electric Co.,Ltd., such as three-phase balance, energy saving, material saving, etc., and the necessity of applying three-dimensional wound core transformer to green transformer, hoping to provide effective help for relevant personnel.

The measuring principle and application of the tension meter in the acid continuous rolling mill of the cold rolling silicon steel plant in Shanxi Taigang Stainless Steel Co.， Ltd. were introduced in this paper. The tension meter was not stable in actual production, which caused frequent failures. In order to ensure the stability of the measurement accuracy of the tension meter, targeted improvement measures were proposed for the failure points of the tension meter, which have obvious effects in the use process.