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通过热力学分析和计算,得出紧凑式带钢生产技术(CSP)流程低碳低硅铝镇静钢优化精炼渣成分(质量分数)为:CaO 50%~55%,Al2O330%~36%,SiO21%~6%.在[Al%]=0.03时与之平衡的钢液成分为:[Si]0.2%~0.4%,氧活度(a[O])小于4.5×10-6,[Ca]2×10-5~4×10-5.优化的精炼渣有很好的脱氧、脱硫和控硅能力,同时其有较低的熔点,优良的流动性和吸收夹杂物能力.实验室渣-钢平衡实验和工业试验均证明,优化的精炼渣系能够很好地控制钢液成分和夹杂物,有效提高钢水的洁净度.使用优化渣系后冷轧板由于表面质量问题而降级使用的比率由原来的1.23%降低为0.8%,而且吨钢钢包(LF)精炼成本降低了4.30元,接近10%.
Through the thermodynamic analysis and calculation, the process of compact strip steel production technology (CSP) is proposed. The optimized refining slag composition (mass fraction) for the low carbon and low alumina aluminum killed steel is: CaO 50% ~ 55%, Al2O330% ~ 36%, SiO21% ~ 6%, the balance of molten steel with [Al%] = 0.03 is: [Si] 0.2% -0.4% and the oxygen activity × 10-5 ~ 4 × 10-5. Optimized refining slag has good deoxidation, desulfurization and silicon control ability, at the same time, it has lower melting point, excellent fluidity and ability to absorb inclusions. Equilibrium experiments and industrial tests have proved that the optimized refining slag system can control the composition and inclusions of molten steel well and improve the cleanliness of the molten steel effectively.Using the optimized slag cooling system due to the surface quality problems degraded The original 1.23% to 0.8%, and tons of ladle (LF) refining costs by 4.30 yuan, close to 10%.