Method for manufacturing high magnetic induction grain-oriented silicon steel through short-process medium and thin slab

Abstract

The invention discloses a method for manufacturing high magnetic induction grain-oriented silicon steel through a short-process medium and thin slab. The method comprises hot metal pretreatment, smelting, LF furnace external refining, medium and thin slab continuous casting and rolling, normalizing acid pickling, cold rolling, decarburizing annealing and MgO coating, high-temperature annealing, hot stretching leveling and insulation layer coating and rewinding packaging. The steel comprises the following components according to the weight percent ratio: 0.01 to 0.1 of C, 2.5 to 3.5 of Si, 0.05 to 0.20 of Mn, 0.005 to 0.02 of P, 0.005 to 0.03 of S, 0.005 to 0.02 of Als, 0.006 to 0.10 of N, the balanced of Fe and inevitable impurities. The process overall finished product yield after hot rolling is improved by more than 5 percent, magnetic induction B8 is improved to be more than 1.88T, and the iron loss P1.7 is reduced to below 1.20W / kg.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a method for preparing high magnetic induction oriented silicon steel from a thin slab in a short process. Background technique [0002] Oriented silicon steel is an electrical steel whose crystal grains are easily magnetized parallel to the rolling direction and contains about 3% silicon. It is called a "artwork" in steel products because of its high technical content and complex process. It is used in electric power, One of the important soft magnetic alloys in the electronics industry. [0003] The general preparation method of ordinary magnetic induction oriented silicon steel (GO steel) is the double cold rolling method. The composition is designed with five elements that are easy to control in steelmaking, and no other alloy elements are added. The process flow is: smelting→continuous casting→hot rolling →Normalized pickling→Primary cold rolling→Intermediate annealin...

AI Technical Summary

Problems solved by technology

Although the production method of the secondary cold rolling method is stable, it is difficult to obtain high magnetic induction, and because of the long production process, it is difficult to reach a high level of yield; the conventional primary cold rolling method is due to the addition of other alloy elements, causing The difficulty of smelting increases, the cost increases, and it is not conducive to saving energy

When thin slabs are used, due to the use of funnel-shaped crystallizers and high casting speeds, defects such as slag rolling and slag inclusions are prone to appear on the surface of the slab, which affects the magnetic properties of the product

The production of thick slabs needs to increase the heating temperature of the slabs, while the production of thin slabs is prone to surface defects

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