High-magnetic strength oriented silicon steel and production method thereof

Abstract

The invention discloses high-magnetic strength oriented silicon steel, comprising the following components by weight percent: 0.055-0.095% of C, 2.95-3.25% of Si, 0.050-0.090% of Mn, no more than 0.01% of P, 0.010-0.025% of S, 0.006-0.010% of N, 0.05-0.5% of Cr, 0.020-0.030% of Als, 0.002-0.1% of Bi, 0.01-0.06% of Se and 0.01-0.06% of Sb. The production method comprises the following production steps: heating a casting blank; rolling, processing at normal temperature; conventionally rolling into the product by adopting a primary cold rolling method or a secondary rolling method containing intermediate annealing; decarbonizing and annealing; coating a parting compound of taking magnesium oxide as a main ingredient; annealing at high temperature by adopting secondary heat preservation, carrying out heat preservation at 800-1100 DEG C for 5-20 hours, and at 1170-1220 DEG C for 5-25 hours in a full-hydrogen atmosphere; stretching and flatly annealing; coating an insulating layer on the surface of a steel plate. The magnetic induction strength B800 of the oriented silicon steel is not lower than 1.95T by independently adding or compositely adding Sb, Se and Bi grain-boundary segregation elements, and the magnetic property is stable.

Description

technical field [0001] The invention relates to an oriented silicon steel and a production method thereof, in particular to a high magnetic induction oriented silicon steel and a production method thereof. Background technique [0002] Grain-oriented silicon steel is widely used as the iron core material of transformers. As one of the main components of transformers, the performance of iron cores will directly affect whether the transformer can operate economically and reliably. High magnetic induction and low iron loss are the most important characteristics of grain-oriented silicon steel. The magnetic induction intensity represents the magnetization ability of the material. The higher the magnetic induction intensity of the steel plate, the lower the excitation current (ie, no-load current) of the iron core, and the copper loss and iron loss are both reduced, which can save electric energy. At the same time, the high magnetic induction oriented silicon steel sheet has low...

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Problems solved by technology

[0009] In the previous inventions, grain-oriented silicon steel with high magnetic induction and low iron loss is produced by adding or adjusting the components in the steel, or by reducing the thickness of the plate in the subsequent process, which is prone to secondary recrystallization instability or steel problems such as surface quality; by controlling the heating rate during decarburization annealing or high-temperature annealing, it will also cause problems of large-scale production applicability

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