关键词: 500 MPa车轮钢, 疲劳寿命, 扩孔性能应用

Abstract:  The 5. 0 mm strip of developed tested steel 510CL (/% : 0. 08C, 0.07Si, 1.25Mn, 0. 008P, 0. 005S, 0. 023 Nb, 0. 018Ti) is produced by semi-steel desulphurization- 200 t top and bottom combined blowing converter-LF-230 mm x 1 650 mm slab casting-continuous rolling process. In order to ensure the better welding performance of wheel steel, the 500 MPa high strength wheel steel is developed by low carbon Nb-Ti microalloying combined TMCP (Thermo-Mechanical Control Process) technology. The hole-expansion rate of tested steel is more than 100% , the welding performance is better, the cold-forming performance and the fatigue life of steel all meet the user technical index, and after application the test steel is up to design requirement.