High-grade non-oriented silicon steel and production method thereof

Abstract

The invention discloses high-grade non-oriented silicon steel and a production method thereof. The non-oriented silicon steel comprises the following chemical components including, by mass, 0.002%-0.004% of C, less than or equal to 0.003% of S, 1.4%-1.7% of Si, 0.7%-0.95% of Mn, less than or equal to 0.03% of P and 0.015%-0.035% of Sn, and 11*([Si]-1.4%)=14*([Mn]-0.7%). According to the production method of the non-oriented silicon steel, the heating temperature of a continuous casting billet is 1120 DEG C-1150 DEG C, the finish rolling temperature of finish rolling is 890+/-15 DEG C, the rolling reduction of finish rolling of the last pass is larger than or equal to 30%, the total rolling reduction of finish rolling of the last two passes is larger than or equal to 50%, and the coiling temperature is 650+/-20 DEG C; and normalization treatment is not needed before acid continuous rolling, the obtained non-oriented silicon steel is good in magnetic performance, the surface of the non-oriented silicon steel is free of corrugated defects, and the requirements of the low-cost high-grade non-oriented silicon steel are met.

Description

technical field [0001] The invention belongs to the technical field of steel material preparation, relates to a high-grade non-oriented silicon steel, and also relates to a production method of the high-grade non-oriented silicon steel. Background technique [0002] Non-oriented silicon steel is the iron core material of the motor and generator rotor working in the rotating magnetic field, which requires good magnetic properties, including lower iron loss and higher magnetic induction. According to the technical standards and technical agreements of various countries, the iron loss P 1.5 / 50 Non-oriented silicon steel ≤4.00W / kg is called high-grade non-oriented silicon steel, and high-grade non-oriented silicon steel is mainly divided into four categories according to thickness specifications: 0.35mm thickness series, 0.50mm thickness series, special thick specification series and special thin specification series. High-grade non-oriented silicon steel is mainly used in lar...

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Problems solved by technology

[0005] In order to solve the technical problem that normalization treatment is required in the production process of high-grade non-oriented silicon steel in the prior art, the purpose of the present invention is to provide a production method of high-grade non-oriented silicon steel without normalization treatment, and to provide a method using High-grade non-oriented silicon steel prepared by this production method

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