Manufacturing method of high-frequency thin strip silicon steel

Abstract

The invention provides a manufacturing method of high-frequency thin strip silicon steel. The manufacturing method is applicable to steel with the silicon, manganese and aluminum content being greaterthan 2.5%, and cold-rolled non-oriented silicon steel with the thickness being less than or equal to 0.35mm. The manufacturing method comprises the steps as follows: performing refining for decarbonization, deoxidation through silicon, silicon alloying and aluminum alloying, controlling the sulfur content to be less than or equal to 0.020%, the nitrogen content to be less than or equal to 0.0100%, and the niobium, vanadium and titanium content to be less than or equal to 0.025%; adding microalloy elements: 30-150% [S] of copper and 50-100% [N] of boron; controlling a superheat degree to be 15-50 DEG C and a pulling rate to be 0.3-1.2m / min during continuous casting, and controlling the casting blank columnar crystal proportion to be greater than or equal to 50%; performing casting blank hot rolling and heating, allowing the charging temperature to be greater than or equal to 300 DEG C, and heating in a neutral or reducing gas atmosphere for 180-240min with the heating temperature beingless than or equal to 1200 DEG C. By adopting the method, a thinning effect of a finished product and an effect of reducing eddy loss under high-frequency magnetization are achieved; the production control difficulty of an entire procedure is reduced, and technical difficulty of producing products with higher alloy content and thinner specifications is avoided.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for manufacturing high-frequency thin-strip silicon steel. Background technique [0002] Electrical steel products are widely used metal functional soft magnetic materials, mainly used in the field of iron core manufacturing of various motors and electrical appliances. With the development of new energy technology and the wide application of frequency conversion technology, high-frequency variable frequency high-efficiency motors have gradually become mainstream products, which put forward higher requirements for the electromagnetic properties of electrical steel. On the one hand, it is required to reach the conventional electromagnetic performance level in the low frequency (50-60Hz) working range, and the products in the medium and high frequency working range have high frequency and low loss characteristics, which brings more contradictory performance index requ...

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Problems solved by technology

Correspondingly, the difficulty of production control is increased, the production cycle is long, the cold workability is deteriorated, the rolling recovery rate is low, and the cost is greatly increased

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