Refining Process Optimization of Vanadium-bearing Steel 20CrMoV for Automotive Gear

In order to optimize the refining process of 20 CrMoV automobile gear steel containing vanadium,the refining tests of 20 CrMoV steel samples at different refining time（20～60 min）and soft blowing time（10～50 min）were carried out.The oxygen content and hydrogen content in the steel samples were measured,and the wear resistance was tested and analyzed.The results show that the oxygen content,hydrogen content and wear volume of steel samples decrease firstly and then increase with enlarging refining time and soft blowing time.Compared with refining time for 20 min,when the refining time is 50 min,the oxygen content reduces by 27.59%,the hydrogen content decreases by 64.52% and wear volume reduces by 46.15%.Compared with blowing time for 10 min,when the blowing time is 30 min, the oxygen content reduces by 14.85%,the hydrogen content decreases by 62.07% and wear volume reduces by 41.67%.The optimized refining time and soft blowing time of 20 CrMoV vanadium-bearing automobile gear steel are 50 min and 30 min,respectively.