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.

摘要： 开发试验的 510CL 钢( /% ：0. 08C, 0. 07Si, l. 25Mn, 0. 008P, 0. 005S, 0. 023Nb, 0. 018Ti)经半钢脱硫- 200 t顶底复吹转炉-LF-230 mm x 1 650 mm板坯连铸-连轧成5. 0 mm板。为了保证车轮钢具有良好的焊接性能，采 用了低碳Nb-Ti微合金化,并结合TMCP(热机械控制轧制工艺)技术开发出500 MPa高强度车轮钢。试验钢的扩 孔率超过100%和焊接性能良好,其冷成形性能和疲劳寿命均达到用户的技术指标，使用后试验钢达到设计要求。

关键词: 500 MPa车轮钢, 疲劳寿命, 扩孔性能应用