Method for preparing {100} surface developed-texture non-oriented silicon steel thin strip based on thin-strip continuous casting

Abstract

The invention belongs to the technical field of metallurgy, in particular to a method for preparing a {100} surface developed-texture non-oriented silicon steel thin strip based on thin strip continuous casting. The method comprises the steps of smelting molten steel according to set components, wherein the set components comprise, by weight percentage, 0.002-0.005% of C, 2.2-3.5% of Si, 0.2-0.3% of Mn, less than or equal to 0.005% of Al, 0.08-0.20% of P, 0.002-0.005% of S and the balance Fe and inevitable impurities; (2) carrying out thin-strip continuous casting to form a cast strip with the thickness of 1.5-2.5mm; (3) carrying out one-pass hot rolling under an inert atmosphere condition; (4) carrying out single-stage multi-pass cold rolling on the hot rolled strip after clearing oxide skin of the hot rolled strip; (5) carrying out two-stage annealing on the cold rolled coil; and (6) applying an insulating layer to obtain a high-performance non-oriented silicon steel finished product. The method is based on the thin-strip continuous casting, the low-melting-point element P is added, the segregation characteristic of the P on the surface and the grain boundary is utilized, and therefore the intensity of {100} texture in the finished product plate can be enhanced. The method has the advantages that the technological process is short, the energy is saved, the consumption is reduced, and the anisotropy of the finished product plate can be obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing a {100} plane developed texture non-oriented silicon steel thin strip based on thin strip continuous casting. Background technique [0002] Silicon steel is the most widely used soft magnetic material in industry, and it belongs to ferromagnetic material. Industrial non-oriented silicon steel is widely used in various motors. Due to the need for energy saving, the important topic of reducing iron loss has attracted the attention of many researchers. The main factors affecting the magnetic induction of non-oriented silicon steel are chemical composition and crystal structure, and the ideal crystal structure is {001} <uvw>, because it is isotropic and the hard magnetization direction <111> is not on the rolling surface. The {100} direction of silicon steel plate is the direction of easy magnetization. For non-oriented silicon stee...

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Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the preparation method of the existing non-oriented silicon steel with high magnetic induction and low iron loss, the present invention provides a method for preparing non-oriented silicon steel thin strip with {100} plane developed texture based on thin strip continuous casting. Understanding the microstructure-texture system during the sub-rapid solidification process of silicon steel prepared by roll thin strip continuous casting, adding low melting point element phosphorus, using phosphorus element segregation behavior on the surface and grain boundary, enhancing the advantages of {100} plane texture in the structure, and obtaining high Magnetic induction low iron loss non-oriented silicon steel

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