Cold-rolled non-oriented silicon steel low in iron loss and production method

Abstract

The invention discloses cold-rolled non-oriented silicon steel low in iron loss. The cold-rolled non-oriented silicon steel low in iron loss is composed of, by weight, Si of 3.0-3.7%, Als smaller than or equal to 0.15%, C smaller than or equal to 0.004%, Mn of 0.15-0.80%, P smaller than or equal to 0.02%, S smaller than or equal to 0.005% and N smaller than or equal to 0.002%. The invention further discloses a production method of the cold-rolled non-oriented silicon steel low in iron loss. The production method comprises the production steps of steel making and blank casting; cast blank heating; hot rolling; normalizing; cold rolling after conventional acid pickling; annealing of primary finished products; annealing of final finished products; cooling, coating and finishing. According to the cold-rolled non-oriented silicon steel low in iron loss and the production method, by lowering the content of Als, the iron loss is further lowered; by annealing the finished products twice, the cold-rolled non-oriented silicon steel with the thickness being 0.35 mm, the iron loss P1.5 / 50 smaller than or equal to 2.0 W / kg and the magnetic inductivity B5000 greater than or equal to 1.67 T can be obtained, the rate of the finished products is high, and the cost is low.

Description

technical field [0001] The invention relates to a kind of non-oriented silicon and its method, in particular to a kind of silicon with a thickness of 0.35mm and iron loss P 1.5 / 50 Low iron loss cold-rolled non-oriented silicon steel ≤2.0W / kg and its production method. Background technique [0002] Cold-rolled non-oriented silicon steel is mainly used in iron core materials of various electric motors and rotating machines, and iron core materials of static devices such as transformers. [0003] High-grade non-oriented silicon steel is mainly used in the manufacture of iron cores for large-scale motors and generators, as well as iron cores for special equipment. The main feature of its magnetic properties is low iron loss. According to classical theory and traditional technology, the production of such products requires Si content above 3.0%, adding more than 0.2% Al, in order to achieve the purpose of reducing iron loss by increasing resistivity. However, in the actual prod...

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Problems solved by technology

The process provided in this document patent is relatively complicated, and it is produced by three-time cold rolling method, which greatly reduces the yield and prolongs the production cycle, and the reduction rate of the first cold rolling is as small as 5-15%. After the steel plate is thicker, the production efficiency of the unit is low during annealing

The process in this literature patent is difficult to implement in production

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