Double-roll thin-belt continuous casting fine crystal grain orientated silicon steel thin strip stock and manufacturing method of thin strip stock

Abstract

The invention provides a double-roll thin-strip continuous casting fine crystal grain orientated silicon steel thin strip stock and a manufacturing method of the thin strip stock. The thin strip stock consists of the following ingredients in percentage by mass: 0.01 to 0.08 percent of C, 2.8 to 3.4 percent of Si, 0.05 to 0.30 percent of Mn, 0.015 to 0.04 percent of S, 0.005 to 0.05 percent of Als, 0.003 to 0.010 percent of N, 0.01 to 0.5 percent of Ti, 0 to 0.6 percent of Cu, 0 to 0.2 percent of Sn, at most 0.004 percent of O, at most 0.01 percent of P and the balance Fe, wherein the average crystal grain dimension is 20 to 45mm. The method comprises the following steps of (1) melting molten steel; (2) adopting a double-roll thin-strip continuous casting device, and casting molten steel into a cavity to form a melting bath, wherein the overheat degree of the upper surface of the melting pool is 10 to 70 DEG C, and the molten steel is guided out at a speed being 20 to 80m / min. The thin strip stock and the manufacturing method have the advantages that the manufacturing process is simple and effective; the fine crystal grain structure is favorable for improving the toughness and plastic performance of an orientated silicon steel plate, and is favorable for the subsequent texture regulation and control.

Description

technical field [0001] The invention belongs to the field of electrical steel manufacturing, and in particular relates to a fine-grain-oriented silicon steel strip billet for twin-roll thin strip continuous casting and a manufacturing method thereof. Background technique [0002] Oriented silicon steel is an important soft magnetic material, which has high magnetic induction and low iron loss when magnetized along the rolling direction, and is mainly used to produce transformer cores; since Goss first proposed the production process of oriented silicon steel in the 1930s, Metallurgists are constantly striving to simplify the production process and improve the magnetic properties; however, the existing production process of grain-oriented silicon steel still has problems such as complex equipment, many manufacturing processes, large energy consumption, and large environmental load. Twin-roll thin strip continuous casting is a short-flow, near-net shape processing technology t...

AI Technical Summary

Problems solved by technology

[0004] After retrieval, Japanese Patent Application Hei 6-31397 discloses a method for preparing oriented silicon steel equiaxed crystal thin strip blanks by using twin-roll thin strip continuous casting technology; The heat conduction of molten steel, thereby preventing the development of columnar crystals; the defect of this method is that the local contact state between argon gas and molten steel and the rotating crystallization roll surface is difficult to control, which will cause the heat conduction between molten steel and crystallization rolls to be particularly unstable. So that the thin strip blank structure is uneven

[0005] Patent CN102069167A discloses a method for preparing oriented silicon steel equiaxed thin strip billet by using twin-roll thin strip continuous casting technology; the method is: controlling the superheat of molten steel in the thin strip continuous casting process, the molten steel in the molten pool and the surface of the crystallization roller The key process parameters such as contact arc length and contact time are used to obtain equiaxed grains; the disadvantage of this method is that the superheat of molten steel needs to be controlled between 15 and 30 °C, and the temperature control range is narrow, which increases the difficulty of control

Images