550MPa级低成本商用车车轮钢的工业试制及性能研究

Pilot Production and Performance of 550 MPa-Grade Low Cost Steel Plate for Commercial Wheels

通过对普碳钢进行成分微调以及利用控轧控冷工艺在本钢热连轧生产线上开发研制了晶粒尺寸为4～6μm,抗拉强度达550 MPa的低成本高强度商用车车轮钢板。研究结果表明,该钢具有良好的塑性、低温韧性和焊接性能。对Q235B、双相钢DP590和试轧钢板进行的扩孔试验结果表明,试轧钢板亦具有良好的延伸凸缘性能。在某车轮厂,以试轧钢板为材料进行了轮辐试制并对总成车轮进行了动态弯曲疲劳试验。结果表明,轮辐成形合格率达到99%以上,并且在车轮质量降低10%时仍保持较高的疲劳寿命。

High strength and low cost wheel steel for commercial vehicles, whose ferrite grain size is 4-6μm and the tensile strength of which is up to 550 MPa, was developed by accurate composition adjustment （trimming） and TMCP. The results showed that this test wheel steel has great plasticity, low-temperature toughness and weldability. The results of under-reaming experiment for Q235B, DP590 and the test steel showed that the test steel has excel- lent flange elongation. The wheel spokes were made from steel and dynamic cornering fatigue test was carried out on assembled wheels. The results showed that the yield of spokes was larger than 99% and the fatigue life of wheels was high enough while the quality of wheel was degraded by 10%.