Abstract: The production flow sheet of 16MnCr5 cold heading steel for automobile engine valve tappet is 80 t top and bottom combined blown converter→LF + RH refining→325 mm x 280 mm bloom continuous casting→high-speed wire rolling. 16MnCr5 steel is successfully developed by using basicity 4. 8 refining slag (/% ：54. 5CaO,28. 5A1₂O₃,11. 2SiO₂, 6. 2MgO,0.6FeO + MnO) ,to cancel calcium treatment process,cast billet surface quenching technology,finishing rolling at 880 ~900℃; and coiling temperature at 850 ~ 870 °C. The inspection results show that the metallographic structure of Φ30 mm wire rod is uniform ferrite + pearlite with grain size rating 8 ,the reduction of area is 71. 1 % ~ 72. 5% ,1/3 cold upsetting is qualified. The oxygen content is 0.0010% ~0.0012% ,and the N content is 0.004 5% ~0. 004 7% ,the size of inclusions is all within 10 μm, and there is no Ds type inclusions. The inclusions are mainly single magnesium-aluminum spinel inclusions. The wire rod has good plastic deformation capacity and high purity, to meet the customer^, s requirements.

摘要： 汽车发动机气门挺柱用冷镦钢16MnCr5生产流程为80t 顶底复吹转炉→LF+RH精炼→325 mm×280 mmm大方坯连铸→高速线材轧制。通过采用碱度4.8的精炼渣（/%:54.5CaO,28.5Al₂O₃,11.2SiO₂,6.2MgO,0.6FeO+MnO）、取消钙处理工艺、铸坯表面淬火技术、精轧温度880～900℃、卷取温度850～870℃等工艺,成功开发出16MnCr5钢。检验结果表明,生产的Φ30 mm盘条金相组织为均匀的铁素体+珠光体,晶粒度8级,断面收缩率71.1%～72.5%,1/3冷镦合格;氧含量0.0010%～0.0012%,N含量0.0045%～0.0047%,夹杂物尺寸均在10μm以内,无Ds类夹杂,夹杂物类型主要为单一的镁铝尖晶石夹杂。盘条具有良好的塑性变形能力和较高的纯净度,满足了客户的要求。