Requirements of continuous casting mold copper tube for molten steel1. The continuous casting mold copper tube puts forward very strict requirements on the qua
Requirements of continuous casting mold copper tube for molten steel
1. The continuous casting mold copper tube puts forward very strict requirements on the quality of molten steel:
1.1 Molten steel temperature: The requirements of continuous casting molten steel are: low superheat, stable and uniform.
1.2 Molten steel purity: to minimize harmful impurities (such as S, P) and inclusions, to ensure the smooth running of the casting machine and improve the quality of the cast slab. If the S content in molten steel is greater than 0.03%, longitudinal cracks of the cast slab are prone to occur, and the high inclusion content in the molten steel can easily cause the accumulation of internal arc inclusions in the cast slab of the arc caster, which will affect the quality of the product.
1.3 The composition of molten steel: to ensure that the alloy elements added to the molten steel can be evenly distributed, and the composition is controlled within a narrow range to ensure the stability of product performance.
1.4 For the castability of molten steel, it is necessary to maintain a suitable and stable molten steel temperature and degree of deoxidation to meet the castability of molten steel. Such as aluminum deoxidation, the high content of Al2O3 inclusions in molten steel and poor fluidity can easily cause blockage of the tundish nozzle and interrupt pouring.
2. Requirements for the pouring temperature of continuous casting molten steel:
(1) Low superheat. On the premise of ensuring smooth pouring, the superheat should be controlled as low as possible. The billet is generally controlled at 20~30℃.
(2) Uniformity. In fact, the temperature of the molten steel in the ladle is low up and down, while the middle temperature is high. This will cause the temperature of the molten steel in the tundish to be low at both ends and high in the middle, which is not conducive to the control of the pouring process. Therefore, the temperature of the molten steel in the ladle is required to be even up and down. .
(3) Stable, the temperature of molten steel supplied to each furnace during continuous pouring should not fluctuate too much, and keep it within the range of 10°C.
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