电弧炉返回法冶炼Cr13型不锈钢工艺优化实践

Process Optimization Practice of Electric Arc Furnace Recirculating Metal for Stainless Steel Cr13

通过提高返回比并使炉料小型化,控制冶炼过程开始吹氧温度、升温速度和终点温度,将高熔点、低碱度渣系优化为CaO/SiO21.4~2.5的高碱度、低熔点的45.6~53.6 CaO-21.6~32.0 SiO2-3~13 Cr2O3-5~10MgO-5~10 Al2O3-0~5 CaF2复合渣系,以及采取合理的供电制度等工艺措施,使不锈钢冶炼时间缩短30 min/炉,电耗降低75 kWh/t,电极消耗降低1.89 kg/t,炉龄提高64次,渣中Cr2O3含量降低到6%~12%。

With using the process measures including increasing the return ratio and miniaturizing the burden,controlling the start-blowing oxygen temperature,heating rate and end-point temperature,modifying the high melting point and low basicity slag series to high basicity of CaO/SiO2 1.4~2.5 and low melting point 45.6~53.6 CaO-21.6~32.0 SiO2-3~13 Cr2 O3-5~10 MgO-5~10 Al2 O3-0~5 CaF2 slag series,and reasonable power supply system the tap to tap time of stainless steel is shortened by 30 minutes per heat,the power consumption is reduced by 75 kWh/t,the electrode consumption is reduced by 1.89 kg/t,the furnace life is increased by 64 heats,and the content of Cr2 O3 in slag is reduced to 6%~12%.