A twin-roll thin strip continuous casting fine-grain oriented silicon steel thin strip blank and its manufacturing method

Abstract

A twin-roll thin strip continuous casting of fine-grained oriented silicon steel thin strip and its manufacturing method. The composition of the thin strip according to mass percentage is: C 0.01~0.08%, Si 2.8~3.4%, Mn 0.05~0.30%, S 0.015 ~0.04%, Als 0.005~0.05%, N 0.003~0.010%, Ti 0.01~0.5%, Cu 0~0.6%, Sn 0~0.2%, O<0.004%, P<0.01%, the balance is Fe; average The grain size is 20~45 mm; the method is: (1) smelting molten steel; (2) using a double-roller thin strip continuous casting device, pouring molten steel into the cavity to form a molten pool, and the upper surface of the molten pool has a superheat of 10~70°C. The molten steel is exported at a speed of 20~80m / min. The manufacturing process of the present invention is simple and effective. This fine grain structure helps to improve the toughness and plasticity of the oriented silicon steel sheet, and is beneficial to subsequent texture 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...

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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

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