中频炉采用废钢冶炼超低碳铁素体不锈钢的生产实践

The Production Practice of Scrap Been Used Smelting Ultra Low Carbon Ferrite Stainless Steel in Medium Frequency Furnace

摘要: 为了在中频感应炉利用废钢代替纯铁冶炼出超低碳铁素体不锈钢，采用各种废钢进行了超低碳铁素体不锈钢的生产实践。结果表明，通过吹氧工艺可以使C降低到0.025%；钢中Si含量降低到0.005%是吹氧冶炼超低碳钢的必要条件；吹氧后进行硅铁钢液脱氧，配合硅钙、粘土块熔渣改质，使熔渣碱度变为0.8~1.2，降低初始FeO和Cr₂O₃含量，可以有效解决熔渣熔点高、熔渣结壳等生产难题。

Abstract: To use scrap instead of pure iron in intermediate frequency induction furnace smelting ultra low carbon ferrite stainless steel, a variety of scraps were used in ultra low carbon ferrite stainless steel production practice. The results show that, the content of carbon can be reduced to 0.025% by oxygen blowing process, it is necessary condition that silicon content reduced to around 0.005% in oxygen blowing smelting ultra low carbon steel, and it can effectively solve the production pro- blems such as high slag melting point and molten slag crusting by ferrosilicon deoxidization after oxygen blowing, cooperating with the calcium silicon and clay piece of slag modification, making slag basicity 0.8 to 1.2, and lowering initial FeO and Cr₂O₃ content.