Technological process for controlling secondary recrystallization crystal particle dimension of oriented silicon steel

Abstract

The invention discloses a process method for controlling sizes of secondary recrystallization grains of oriented silicon steel, mainly comprising the following steps of: A) smelting, a converter or an electric furnace is used for steelmaking, molten steel is used for acquiring an oriented steel casting billet after the secondary refining and continuous casting, wherein, N content is equal to or higher than 40ppm; B) hot rolling; C) normalizing; D) cold rolling, the cold rolling lasts until reaching the thickness of finished plates, and the final reduction rate is equal to or higher than 80 percent; E) decarburization / nitriding, including the decarburization annealing or nitriding treatment to steel plates, and cleaning to oxide layers; F) coating aluminum paste to form a fine aluminum grid; and G) high temperature annealing and hot leveling annealing. The process method has advantages of simple procedure and easy operation, and can reach the effects of thinning magnetic domain and effectively controlling sizes and shapes of the secondary grains without laser notching.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a production process of grain-oriented silicon steel. Background technique [0002] The basic chemical composition of grain-oriented silicon steel is Si (2.5-4.0%), C (0.01-0.10%), Mn (0.01-0.1%), S (0.005-0.050%), Als (0.005-0.05%), N (0.003 ~0.012%), some composition systems also contain Cu, Mo, Sb, Cr, B, Bi and other elements, and the rest are iron and unavoidable impurity elements. [0003] The common manufacturing process of grain-oriented silicon steel is as follows: use a converter or an electric furnace to make steel and continuously cast it into a slab after secondary refining, which is kept for a long time to make the beneficial inclusions fully dissolved, so that they can be used in the subsequent hot rolling and normalization process In the matrix, fine inhibitors are dispersed and precipitated in the matrix; after the hot-rolled sheet is normalized (or not norma...

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Problems solved by technology

[0017] Based on the above analysis, most current patents for refining magnetic domains use various methods to apply external stress to refine magnetic domains. However, laser scribing or electron beam treatment have disadvantages such as poor high temperature stability; stress coating also has costs. Disadvantages such as high and limited magnetic improvement effect

Other ways to improve magnetic properties are by adjusting existing parameters. The adjustment effect is limited by physics or metallurgy, and the controllability is poor and the effect is limited.

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