Preparation method of cold-rolled non-oriented silicon steel

Abstract

The invention discloses a preparation method of cold-rolled non-oriented silicon steel. The method comprises the following steps that 1) smelting and continuous casting are conducted into plate blanks, wherein the plate blanks comprise the following components of, by weight, less than or equal to 0.0030% of C, 2.90%-3.50% of Si, 0.15%-0.30% of Mn, 0.80%-1.5% of Als, less than or equal to 0.008% ofP, less than or equal to 0.0020% of S, less than or equal to 0.0025% of N, less than or equal to 0.0020% of Ti, less than or equal to 0.0020% of Nb and less than or equal to 0.0020% of V; 2) the castblank is heated; 3) hot rolling is conducted; 4) coiling is conducted; 5) normalizing is conducted; 6) cold rolling is conduted; and 7) annealing is conducted, wherein the temperature rising speed vmeets the condition that 20+2.15 * (WSi + WAls) is less than or equal to v, and v is less than or equal to 80-3.85 * (WSi + WAls). According to the preparation method, the high-grade cold-rolled non-oriented silicon steel can be obtained, and the steel has the iron loss P1.5 / 50 less than or equal to 2.40W / kg, the magnetic inductance B50 larger than or equal to 1.68T, and the thickness of 0.50mm.

Description

technical field [0001] The invention relates to the technical field of preparation of non-oriented silicon steel, in particular to a method for preparing cold-rolled non-oriented silicon steel with a thickness of 0.50 mm and a high grade. Background technique [0002] Due to its excellent magnetic properties, non-oriented silicon steel has been used as the iron core material of rotating electrical machines for a long time. With the continuous improvement of energy saving and environmental protection requirements, further improving the magnetic properties of non-oriented silicon steel has become an important issue faced by users and manufacturers. [0003] The indicators to measure the magnetic properties of cold-rolled non-oriented silicon steel mainly include magnetic induction and iron loss. For 0.50mm cold-rolled non-oriented silicon steel, iron loss P 1.5 / 50 and magnetism B 50 Two metrics are used to measure its performance. Iron loss P of current 0.50mm thick cold-ro...

AI Technical Summary

Problems solved by technology

Iron loss P of current 0.50mm thick cold-rolled non-oriented silicon steel products 1.5 / 50 It has been reduced to 2.30~2.40W / kg or even lower, but the magnetic induction B 50 It can only reach 1.62 ~ 1.66T, and it is difficult to further improve the magnetic induction, which has become one of the problems that need to be solved

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