重载汽车齿轮轴用钢SCM440H生产实践  

Production Practice of SCM440H Gear Shaft Steel for Heavy Duty Automobiles

作　　者：刘永昌 李法兴 翟正龙 杜国强 

机构地区：[1]特钢事业部

出　　处：《莱钢科技》2012年第4期10-12,共3页Laigang Science & Technology

摘　　要：采用特钢50tEAF-LF（VD）-260mm×300mm方坯连铸-轧制工艺生产090～0140mm重载汽车齿轮轴用SCM440H钢，通过制定可行的生产工艺及控制要点，钢中成分控制（％：0．39～0．41C、0．21～0．26Si、0．74～0．76Mn、1．00～1．04Cr、0．18～0．20Mo、0．020～0．030A1），[O]、[N]分别控制在14～161×10^-6、60～75×10^-6，低倍组织≤1．0级，非金属夹杂物A、B≤1．0级、C、D≤0．5级，晶粒度I〉8级、末端淬透性及力学性能等指标均满足用户技术要求。090 -040 mm SCM440H gear shaft steel for heavy duty automobiles is produced by continuous casting-rolling process using 260 mmx 300 mm billets produced by 5QtEAF and LF（VD）. By formulating the feasible production process and control points, the chemical compositions of SCM440H（ % ）are 0.39 -0.41C ,0.21 -0.26Si ～0.74 -0.76Mn, 1.00 - 1.04Cr,0.18 -0.20Mo 0. 020 -0. 030A1）, the contents of [01 and IN] are respectively 14 x 10^-6 ～ 16 x 10^-6 and 60 x 10-6 -75 ～ 10^-6, the macrostructure of the steel is below or equal to grade 1.0, A, B non-metallic inclusions are less than grade 1. 0, C,D non-metallic inclusions are less than grade 0.5, the grain size is more than grade 8, moreover, the hardenability and mechanical properties all meet the requirements of users.

关 键 词：电炉流程 齿轮轴用钢 SCM440H 轧制 淬透性 

分 类 号：TG162.71[金属学及工艺—热处理]