新型含Nb弹簧钢LPD65应用研究
Application Research on New Nb-Containing Spring Steel LPD65

商用车悬架系统的轻量化，必然要求设计应力提高，这对悬架系统使用原材料——弹簧钢性能提出了更高的要求。结合国内弹簧钢冶炼及工业化水平，采用铌元素微合金化技术，通过细晶强化和析出强化等途径，开发抗拉强度大于1500 MPa新型含Nb高强弹簧钢原材料LPD65，并对新型含Nb高强弹簧钢原材料LPD65的热处理性能、力学性能、疲劳性能进行研究。研究显示，新型含Nb高强弹簧钢原材料LPD65满足商用车悬架系统轻量化板簧设计需求，同时满足国内主机厂对轻量化悬架板簧疲劳寿命要求。
For commercial vehicles, the lightweight of suspension systems will require improvement of de-sign stress, which needs higher requirements on the performance of the raw materials-spring steel. Combined with domestic spring steel smelting and industrialization levels, using Nb mi-cro-alloying technology, and using fine grain strengthening and precipitation strengthening methods, a new Nb-containing high-strength spring raw material LPD65 was developed. The tensile strength can reach more than 1500 MPa. And the heat treatment properties, mechanical properties and fatigue properties of the new material LPD65 were studied. The result shows that the new Nb-containing high-strength spring steel LPD65 meets the design requirements of lightweight leaf springs for commercial vehicle suspension systems, and also meets the fatigue life requirements of lightweight suspension leaf springs of OEM.