30 t EAF-40 t LF冶炼35MnVS 易切削钢的工艺实践

采用30tEBTEAF40tLF(喂线)3.15t铸锭工艺生产35MnVS易切削钢(%):0.33～0.40C,0.30～0.60Si,1.00～1.40Mn,0.06～0.12V,≤0.035P,0.035～0.075S。30炉35MnVS钢的生产结果表明,LF精炼时,喂硫磺粉线前钢中的硫含量为0.007%～0.032%,喂硫磺粉线后钢中硫含量为0.040%～0.071%,喂丝硫的回收率为50%～80%。喂硫线后,再喂入0.3kg/t的铝线,细化钢的晶粒。35MnVS易切削钢成品材的晶粒度为6～7级,钢的机械性能和高、低倍组织均满足标准要求。

Practice of Free Cutting Steel 35MnVS Steelmaking by 30 t EAF-40 t LF

The free cutting steel 35MnVS- 0.33～0.40C,0.30～0.60Si,1.00～1.40Mn,0.06～0. 12V, ≤0.035P,0.035～0.075S was produced by 30 t EBT EAF-40t LF (wire feeding)- 3.15 t ingot casting process. The production results of 30 heats steel 35MnVS showed that the sulphur content in steel after sulphur powder wire feeding was 0.040%-0.071%, while before feeding that was 0.007%～0.032%;and the sulphur yield of wire feeding was 50%~ 80%.The 0.3 kg/t aluminum wire was feeding after sulphur wire feeding to fine the grain size of steel. The grain size rating of 35MnVS products was 6~7, and the mechanical properties, micro- and macro structure met the standard requirements.