在对 PD350 kg/ m含钒合金钢轨的热处理特性研究基础上 ,研究了采用双频电感应加热、压缩空气欠速淬火的热处理工艺 ,生产了 PD350 kg/ m含钒合金热处理钢轨。钢轨硬化层深度≥ 15mm,组织为全细珠光体 ,屈服强度 σ0 .2 ≥ 890 MPa、抗拉强度 σb≥ 12 80 MPa、延伸率 δ5≥10 %、断裂韧性 K10 ≥ 4 4 .0 MPam1/ 2 。综合性能优良 Based on the study of the heat treatment characteristics of PD350 kg / m vanadium-containing alloy rails, the heat treatment process of dual-frequency induction heating and compressed air under-speed quenching was studied and the heat-treated rails of PD350 kg / m vanadium-containing alloy were produced. The thickness of the hardened layer of rail is ≥ 15mm, the microstructure is fine pearlite, the yield strength σ0. 2 ≥ 890 MPa, the tensile strength σb ≥ 12 80 MPa, the elongation δ5 ≥ 10%, the fracture toughness K10 ≥ 4 4 .0 MPam1 / 2 . Comprehensive performance is excellent