Abstract: The metallurgy flowsheet of developed steel Q460D (/% : 0. 16 ~ 0. 18C, 0.42 ~ 0.48Si, 1.40 ~ 1.46Mn, 0.012 ~ 0.020P, ≤0. 005S, 0. 11 ~ 0. 12V, 0. 020 ~ 0. 050A1, 0.010 2 ~ 0.013 9N)  is >40% hot metal + scrap- 50 t EAF-LF-VD-260 mm x 300 mm bloom casting- hot rolling to ϕ70 ~ 100 mm products. With the process measures including controlling EAF end [C] ≥0. 07% and [P] ≤ 0. 015% , LF refining slag basicity ≥ 3.0, feeding Al and Ca wire, controlling Al 0.030% ~0. 05% and [S] ≤0.005% , and feeding manganese-nitride wire before LF tapping, the mechanical properties of steel is stable i. e. yield and tensile strength, elongation and impact energy of steel being respectively 470 ~504 MPa, 576 ~ 695 MPa, 19. 0% ~ 27.5% and 32 ~ 60 J, the qualified rate of nondestructive testing is 93. 7% , and the stability of composition and each performance of steel is high to meet the of high cleanliness, high homogeneity and high stability of properties of steel for auto axle head.

Key words: Steel Q460D, Auto Axle Head, Improvement, Properties

摘要： 开发的Q460D 钢(/%：0. 16 -0. 18C，0.42 ~0.48Si，1.40 ~ 1.46Mn，0. 012 - 0.020P，≤0.005S，0. 11 ~0. 12V ,0. 020 - 0. 050Al ,0.0102 ~0.0139N)的冶金流程为≥40% 铁水+废钢-50 t 电弧炉-LF-VD-260 mm x 300 mm坯连铸-轧制ϕ70 ~ 100 mm材。通过EAF终点控制[C] ≥0. 07%, [P] ≤0. 015% ,LF精炼渣碱度≥3. 0,喂Al、Ca线，控制Al 0. 030%  ~ 0.05%，控制[S]≤0.005%, LF岀钢前喂氮化锰线等工艺措施，钢的力学性能稳定，屈服、抗拉强度、延伸率和冲击功分别为470 ~ 504 MPa，576 ~695 MPa, 19. 0% -27. 5%和32~60 J,钢的成分及各项性能稳定性高，探伤合格率为93. 7% ,满足汽车轴头用钢高洁净度、高均质化、高性能稳定性的要求。

关键词: Q460D钢, 汽车轴头, 开发, 性能