Continuous casting method for high-aluminum steel plate blank

A steel slab and high-alumina technology, applied in the field of continuous casting of high-alumina steel slabs, can solve problems such as unguaranteed casting slab surface quality, changes in viscosity, melting point, crystallization performance and heat flow physical and chemical properties, and affecting the smooth flow of casting, etc., to achieve Effect of avoiding defects, preventing defects, and stabilizing casting

Active Publication Date: 2019-01-11
SHOUGANG CORPORATION
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Problems solved by technology

[0003] The invention provides a continuous casting method for high aluminum steel slabs, which solves or partially solves the significant changes in various physical and chemical properties such as viscosity, melting point, crystallization performance and heat flow of mold slag during the casting process of high aluminum steel in the prior art. The surface quality cannot be guaranteed, and the technical problems that affect the direct flow of casting

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  • Continuous casting method for high-aluminum steel plate blank

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Embodiment Construction

[0013] see figure 1 , a method for continuous casting of high-aluminum steel slabs provided in an embodiment of the present invention, the aluminum content of the high-aluminum steel slabs is 0.3-3.0%, and the method for continuous casting of high-aluminum steel slabs includes the following steps:

[0014] In step 1, a low casting speed is used for the slab.

[0015] In step 2, the slab is intensively cooled with a crystallizer.

[0016] In step 3, weak fan cooling is used for the slab.

[0017] Step 4: Use high-reaction mold flux for 8-12 minutes before the slab is poured, and use low-reaction mold flux for 8-12 minutes after the slab is poured.

[0018] Because the present application adopts low drawing speed to the slab, it can prevent defects on the surface of the slab. Because the slab is cooled by the crystallizer, it accelerates the solidification of the slab in the crystallizer and prevents defects on the surface of the slab. The slab is weakly cooled in a fan-shape...

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Abstract

The invention discloses a continuous casting method of a high-aluminum steel plate blank, and belongs to the technical field of steel making. The continuous casting method for the high-aluminum steelplate blank comprises the following steps: adopting a low drawing speed for the plate blank; adopting a crystallizer for intensive cooling of the plate blank; adopting fan-shaped section weak coolingfor the plate blank; and adopting high reaction protection slag during the first 8-12min of plate blank pouring, and adopting low reaction protection slag during the last 8-12min of plate blank pouring. By means of the continuous casting method for the high-aluminum steel plate blank, SiO2 in the protective slag can be dynamically adjusted, the composition, alkalinity and performance of the protective slag are effectively stabilized, and targeted control on the cooling process is carried out to ensure stable casting of high-aluminum steel and good slab quality and meet rolling requirements.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a high-aluminum steel slab continuous casting method. Background technique [0002] The active element Al easily interacts with SiO in the mold flux during the casting process of high aluminum steel 2 react. In the prior art, the oxidation-reduction reaction in the 10 minutes before casting of high-alumina steel leads to SiO in mold flux 2 content decreased, Al 2 o 3 The content increases rapidly, while the alkalinity [w(CaO) / w(SiO 2 )] increased sharply, causing significant changes in the physical and chemical properties of the mold flux, such as viscosity, melting point, crystallization properties, and heat flow, and the surface quality of the slab could not be guaranteed. At the same time, due to the significant increase in alkalinity, the crystallization temperature of mold slag increases, the critical cooling rate increases, and the crystal incubation time shortens,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/20B22D11/22B22D11/111B22D11/108
CPCB22D11/001B22D11/108B22D11/111B22D11/20B22D11/22
Inventor 马文俊李海波陈斌刘国梁高攀朱克然刘道正张超杰
Owner SHOUGANG CORPORATION
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