120 t转炉-LF+RH-TB生产LZ50车轴钢坯的化学成分和质量控制

本钢采用优质铁水预处理-120 t转炉冶炼、硅铝钡锶钙复合脱氧-钢包精炼喷Si-Ca粉+RH-TB真空脱气-5 t铸锭-轧制工艺生产230 mm×230 mm×1 350 mm LZ50轴坯钢。生产结果表明,由于控制C0.47%~0.50%,Si 0.20%~0.35%,Mn 0.71%~0.85%,且钢中P、S≤0.02%,平均H]=1.77×10^-6,平均O]=12.22×10^-6,使轴坯钢具有良好的低倍组织和稳定的机械性能,产品质量达到TB/T2945-1999标准要求。

Control of Chemical Composition and Quality of LZ50 Steel Billet for Vehicle Axle Produced by 120 t Converter - LF + RH-TB Process

The 230mm×230 mm×1350 mm LZ50 steel billet for vehicle axle is produced by quality hot metal pretreatmnent - 120 t converter melting and SiAlBaSrCa combined deoxidiing- ladle refiring with Si-Ca powder injection + RH- TB vacuum degassing- 5 t ingot casting - rolling process. The production results showed that due to controlling C content be- tween0.47%～0.50%,Si0.20%～0.35%,Mn0.71%～0.85%,both P,S in steel ≤0.02%,averageH]=1.77 ×10-?,average  O]=12.22×10-?,the  LZ50  steel  billet  had  excellent  macro  structure  and  constant  mechanical  properties, and the quality of products was up to the requirement of TB/T2945 standard.