The strip breaking defects of grain-oriented silicon steel during the cold rolling were tracked, and the evolution process from skinning to hole formation and then to strip breaking was clarified. The scar defect was studied by peeling electron microscope. The results showed that the main elements in the scar defect were Fe, Si and Al, which were consistent with the matrix, and there were also trace elements such as Ca, Mg, K and Na. Cold rolling peeling and breaking was mainly due to hot rolling edge cracking defects inherited. The reasons why peeling and flaking were that part of the edge during the hot rolling occurred flesh out and splashed and was pressed into the surface of the hot rolled plate, and inconsistency of elongation and matrix during cold rolling. By reducing the slab heating temperature, shortening the furnace time of high temperature section and optimizing the rolling model, the edge crack of hot rolled strip was effectively restrained, and the problem of cold rolling strip breaking was solved.

With the merger of Baosteel and WISCO,the varieties of grain-oriented silicon steels in the two production bases of Baoshan and Qingshan have been integrated. In order to further give full play to the scale benefit, improve the production efficiency and improve the competitiveness of enterprises, the standardization and feasibility analysis of the mechanism were carried out for the important link of production and marketing collaboration. On the premise of establishing and implementing the unified product enterprise standard, the quantitative decision-making method of production and marketing collaboration was discussed, which transformed the actual business problem into a mathematical programming model and obtained the optimized order receiving and material feeding suggestions by solving the model. It provided a theoretical basis for balance between the production side and the sales side, so as to maximize the effects of "scale", "benefit" and "efficiency".

The mechanism and influencing factors of black spot defect on strip surface of nonoriented electrical steel annealing unit in the cleaning process of cleaning section were analyzed, and the measures to reduce or even eliminate black spot defect on strip surface were put forward according to the actual production situation of annealing unit on site.

As the tightening of environmental protection policies, environmental protection coating products of non-oriented silicon steel have increased rapidly in recent years. The surface of the environmental protection coating liquid, of which the composition is different from that of traditional chromium-containing coating liquid, is poor on the quality stability and prone to various defects. In the process of producing a certain non-oriented silicon steel, black spot defects appeared on the surface, which impacted greatly on the stability of the production line and the yield of the product. Through macroscopic observation, scanning electron microscope (SEM), energy spectrum analysis, on-site simulation experiments, the causes of black spots were analyzed and control measures for such defects were put forward, which effectively reduced the incidence of black spot defects.

The historical development and current situation of insulation coatings for cold-rolled non-oriented silicon steel in China and TISCO were briefly described in this paper. The main properties and application fields of different types of coatings and the progress of production technology in the coating development process in recent years  in TISCO were introduced, mainly including the independent development of C5 thin environmental protection coatings, the localization of C6 extremely thick coatings, and the development of self-adhesive coating process. At last, the next development direction of insulation coatings were put forward.

In the decade of the new era, China’s technology of 20-high rolling mills has made rapid progress,with breakthroughs in key components.In order to objectively analyze the development of domestic 20-high rolling mills in the past ten years and compare their advantages and disadvantages with those of foreign rolling mills, the application of foreign 20-high rolling mills in China, the changes of China’s output and quality of electrical steel and the development of domestic 20-high rolling mill in the past 10 years were mainly introduced in this paper. And the main characteristics and key indexes of the 20-high rolling mill were analyzed.Meanwhile, the properties of domestic 20-high rolling mills at present were compared with that of imported similar models.

Electrical steel is an indispensable and important soft magnetic material for power, electrical appliances and military industries. It is also an energy conversion material with the largest consumption. It is the main product of energy conservation and emission reduction. It plays a key role in the generation, conversion, transmission and use of electric energy. The magnetic performance of electrical steel and the energy efficiency level of electrical appliances determine the success or failure of the "carbon peaking and carbon neutrality" strategy in the field of electrical appliances. With the implementation of energy efficiency upgrading of electric appliances in China and other countries, the downstream industry has increased demand for high-performance electrical steel. In this paper, the production status of electrical steel in China was introduced, and the impact of energy efficiency upgrading of electrical products on the structure of electrical steel products and the implementation of the "carbon peaking and carbon neutrality" strategy were analyzed. The selection of electrical steel varieties and the demand of electrical steel products were predicted. Some views on the development of electrical steel were put forward for conventional process and short process.

In viewing of  the actual production process of rolling silicon steel on a single stand cold rolling mill of a steel plant, the information about the appearance characteristics and plate surface distribution of the emulsion stains on the relevant rolling mills were collected and analyzed, and the relevant theoretical analysis and actual field production were combined.Finally the relevant causes of the emulsion stains on the single stand cold rolling mill were determined and corresponding solutions were proposed, which provided effective reference for preventing the emulsion stains in the rolling process of other cold rolling products.

Normalizing and pickling is an indispensable process for the production of high grade/ high magnetic induction non-oriented silicon steel and high magnetic induction oriented silicon steel.The selection of important process equipment for normalizing pickling line was introduced in this paper, and some suggestions on the selection of important process equipment were put forward, such as welder, normalizing furnace, pickling section, and so on, which will provide references for similar unit design in the future.