CSP流程低碳低硅铝镇静钢精炼渣成分优化

Optimization of refining slag composition for low carbon low silicon Al-killed steel during CSP process

    摘要
  • 摘要: 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%，Al2O3 30%~36%，SiO2 1%~6%.在Al%=0.03时与之平衡的钢液成分为：Si0.2%~0.4%，氧活度（aO）小于4.5×10-6，Ca2×10-5~4×10-5.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%.

     

    Abstract: By thermodynamic calculations and analysis,the optimized slag composition(mass fraction) of ladle refining for low carbon low silicon Al-killed steel grades was optimized during compact strip production(CSP) process as CaO 50%-55%,Al2O3 30%-36%,SiO2 1%-6%. The equilibrium liquid steel composition is asSi0.2%-0.4%,aO lower than 4.5×10-6,Ca2×10-5-4×10-5when dissolved Al is approximating 0.03%. The optimized slag is more favorable for deoxidation,desulfurization and desiliconization. In addition,it is also with low melting point,quite well fluidity as well as the ability to absorb inclusions.Finally,both slag-steel equilibrium experiments in laboratory scale and industrial trials in plant scale verified that optimized slag can very control the steel composition as well as inclusion composition and improve steel cleanness quite a lot. After applied the optimized slag,the ratio of cold rolled strips that are degraded due to surface quality problems decrease from 1.23% to 0.8%,and the costs of LF refining reduce by 4.30 RMB per ton Fe,namely approximating 10%.

     

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