Manufacturing method of cold rolling electric steel special for compressor

Abstract

The invention discloses a method to produce electrical steel by steel cold-rolling which is specially used for compressors. The method integrates the craft flows of hot rolling with traditional continuous metal cast process and hot rolling with continuous metal cast process of thin stock. It is characterized in that: The chemical constitution (percentage of weight) as follows is adopted: C<=0.03%,Si<=4.0%,Mn:0.1-1.0%,P<=0.16%, S<=0.01%,Al:0.1-0.8%, the rest is Fe and a little impurity. The craft feature is to control the batching temperature of hot rolling at 680-730deg.C. Cold rolling adopts endless rolling by laser welding, and its speed is 600-1000M / min. Crafts including cover annealing with full H2, flash heat and slow cool are introduced. Soaking time is 8 to 15 hours and the temperature is controlled at 670+-30deg.C. The annealing temperature is lower than recrystallization temperature. Crafts of leveling, tension and straightening under high pressure are adopted. The non-oriented electrical steel in this invention has high magnetic strength and low iron loss, which can produce various electrical steel with requirements of other breeds.

Description

technical field [0001] The invention belongs to a method for manufacturing non-oriented cold-rolled silicon steel semi-process special steel for compressors. Background technique [0002] Electrical steel has been around for more than 100 years. With the progress and development of science, electrical steel has become an important functional material in the world. Especially in the past two decades, with the world's energy shortage, the research and development of electrical steel has become the main subject of research in various countries. [0003] Electrical steel is divided into hot-rolled and cold-rolled in terms of rolling methods; it is further divided into non-oriented electrical steel and oriented steel in terms of technology. The market uses a large number of ordinary non-oriented silicon steels. At present, most electromechanical products use high magnetic induction, low iron Damaged non-oriented silicon steel. [0004] The production of non-oriented silicon ste...

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Problems solved by technology

Although the electrical steel produced under this process condition can improve the magnetic induction and reduce the iron loss, but due to the low Si content of this steel, the increase in magnetic induction is not large. , The elimination of stress in the annealing process after cold rolling can not meet the requirements, which brings difficulties to subsequent production, especially the steel for compressors is difficult to meet the requirements, and it is difficult to achieve the above-mentioned process for electrical steel with high Si content