Continuous casting method for low-alloy steel wide and thick slabs

Abstract

The invention discloses a continuous casting method for low-alloy steel wide and thick slabs. The continuous casting method comprises the following steps: pouring molten steel from a tundish into a crystallizer; in the crystallizer, adding casting powder on the liquid level of molten steel; cooling in the crystallizer, so that the molten steel is solidified into casting blanks with liquid cores, and then continuously pulling out the casting blanks with the liquid cores from the outlet of the crystallizer at a pulling speed Vc to pass through a secondary cooling zone so as to obtain completely solidified casting blanks, wherein the pulling speed Vc is controlled at 1.2-1.8 m / min, the binary basicity of the casting powder is 0.85-1.05, the viscosity of the casting powder is 0.05-0.15 Pa.s at 1300 DEG C, and the melting point of the casting powder is 1050-1150 DEG C. As the physical and chemical properties of the casting powder are reasonably controlled, the continuous casting method can effectively reduce the steel leakage alarm rate and that the continuity of production and the product quality are ensured is facilitated.

Description

technical field [0001] The invention relates to the field of continuous casting, in particular to a method for continuous casting of low-alloy steel wide and thick slabs. Background technique [0002] High-efficiency constant-speed continuous casting technology is currently the research direction of metallurgical circles at home and abroad. In the continuous casting production process, steel breakout is one of the most harmful production accidents. It affects the stability and continuity of operations, product quality, The safety of operators and the service life of equipment are adversely affected. Therefore, at present, steel breakout prediction systems are mostly used to avoid steel breakout accidents. Reduce to a lower level (eg 0.2m / min) to eliminate the hidden danger of steel leakage. For the continuous casting of low-alloy steel wide and thick slabs, due to the large cross-sectional area of ​​the slab, the breakout alarm rate is high. Once a breakout alarm occurs, th...

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Problems solved by technology

For the continuous casting of low-alloy steel wide and thick slabs, due to the large cross-sectional area of ​​the slab, the breakout alarm rate is high. Once a breakout alarm occurs, the casting speed of the continuous casting machine will decrease rapidly, and the corresponding position on the slab Inverted "V"-shaped vibration marks will be formed, resulting in more alarm slabs (referring to cast slabs with inverted "V"-shaped vibration marks) in the produced slabs, which will seriously affect the stability of production and product quality, and reduce the economic cost. Therefore, for the continuous casting production of low-alloy steel wide and thick slabs, reducing the alarm rate of breakout is of great significance to ensure the stability of production, product quality and economic benefits

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