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.