Abstract: 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%,average[H]=1.77 ×10-⁶,average  [O]=12.22×10-⁶,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.

Key words: Top and Bottom Combined Blown Converter, LF + RH-TB Refining, LZ50 Steel Billet for Vehicle Axle, Metallurgical Quality

摘要： 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。

关键词: 顶底复吹转炉, LF+RH-TB 精炼, 轴坯钢LZ50, ,  , 冶金质量