控制SPHC钢硅含量的生产实践

Production practice of controlling silicon content in the cold rolled SPHC steel

针对低碳硅铝镇静钢SPHC硅含量超标的问题,从动力、热力学及实际生产方面进行了研究,结果表明控制硅含量的关键点在于:使用SiO2含量较低的原材料、保证进精炼站钢水较低硫含量、转炉控制下渣量3 kg/t以下、控制转炉出钢及LF处理各阶段合适的钢水AlS含量、精确控制吹氩流量、控制热态钢渣回收量8 kg/t以下等。实践中唐山钢铁集团有限责任公司第一钢轧厂SPHC硅合格率达到了100%,取得了很好的效果。

The problem of over limited silicon content in SPHC low-carbon low-silicon Al-killed steel is discussed on the basis of the studies on kinetics, thermodynamics and practical production. The results show that the key points of silicon content control are using low SiO2 raw materials, ensuring low sulfur molten steel before refining, control- ling the quantity of the slag in tapping （no more than 3 kg/t）, choosing suitable alumi- num content in the converter tapping as well as in each stage of LF treatment, control- ling accurately argon blowing rate and controlling the hot steel slag recovery amount within the limit of less than 8 kg/t. In the practical steelmaking in the No. 1 Steelmak- ing Plant of Tangshan Iron ＆ Steel Group Co. , Ltd, the qualified rate of SPHC silicon steel comes up to 100 % and thus very desirable results have been achieved.