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 ~12V, 0.020 ~ 0.050A1, 0.0102 ~0.0139N) is ≥40% hot metal + scrap- 50 t EAF-LF-VD-260 mm x 300 mm bloom casting- hot rolling to 070 ~ 100 mm products. With the process measures including controlling EAF end [C] 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.

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,0.010 2～0.013 9N)的冶金流程为≥40%铁水+废钢-50 t电弧炉-LF-VD-260mm×300mm坯连铸-轧制Φ70～100mm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出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32～60J,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。