含钒钢水SPHC精炼生产实践

PRODUCTION OF SPHC REFINING OF VANADIUM-BEARING MOLTEN STEEL

针对承钢含钒钢水SPHC试制初期出现的成渣晚、造白渣困难、增碳回硅及钢水浇铸困难等问题分析了原因,通过优化渣料、转炉及LF炉工艺,实施早化渣、早成渣、保持白渣时间,保证弱吹氩时间,精确控制处理周期的生产组织模式,SPHC精炼工艺获到了平均脱硫率64.5%、铸坯T[O]28.5×10-6、钢水可浇性100%的良好冶金效果。

It is analyzed the reasons for the problems： late slag forming,difficult to form white slag,carbon increasing and resiliconization,and difficulty to cast molten steel,which present at the beginning of trial production of SPHC refining of vanadium-bearing molten steel,.With measures adopted： optimizing slag material,process of converter and LF furnace,conducting early slaging,early forming slag,keep white slag time,guaranteeing weak-argon-blowing time,and with production organization mode to precisely control treating period,the above problems got solved.And with SPHC refining process a good metallurgical effect got： average desulfurization ratio to 64.5 %,T[O] of casting billet being 28.5×10-6,castability of molten steel reaching 100%.