Design method of secondary cooling water in continuous casting process of high-carbon steel and preparation method of continuous casting billet

Abstract

The invention relates to the field of iron and steel smelting, and in particular relates to a design method of secondary cooling water in a continuous casting process of high-carbon steel and a preparation method of continuous casting billet. The cooling water quantity of each area of a secondary cooling area is distributed according to the formula A*V<2>+B*V+C, wherein for the foot roller area, Ais 0.18 to 0.22, B is 1.39 to 1.43, and C is 0.92 to 0.96; for the area I, A is 0.82 to 0.86, B is -0.97 to -1.01, and C is 2.75 to 2.79; for the area II, A is 0.45 to 0.49, B is -0.25 to -0.29, andC is 0.75 to 0.79; and for the area III, A is 0 to 0.04, B is 1 to 1.05, and C is -1.1 to -1.16. With the methods, when the pulling speed of the high-carbon steel casting billet is controlled to be 1.1 m / min-2.1 m / min, the casting billet has no surface or internal cracks or center segregation, and the bleed-out rate during pouring is the minimum.

Description

technical field [0001] The present application relates to the field of iron and steel smelting, in particular, to a method for designing secondary cooling water in a high-carbon steel continuous casting process and a method for preparing continuous casting slabs. Background technique [0002] The C content of high carbon steel is relatively high, and the general C content is 0.5-1.7%. Due to the high carbon content, quality defects such as cracks are prone to occur during continuous casting of slabs, and in severe cases, steel breakouts are caused. [0003] The continuous casting secondary cooling refers to the forced uniform cooling of the slab in the length interval from the crystallizer outlet to the tension leveler during the continuous casting steelmaking process. This interval is called the secondary cooling zone. This section is equipped with a water spray system and a series of nip roll devices arranged in a straight line (vertical continuous casting machine) or ar...

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Problems solved by technology

[0006] However, these secondary cooling processes all consider the influence of the secondary cooling water on the surface quality of the slab separately, and do not consider the relationship between the casting speed of the slab and the amount of secondary cooling water.

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