Abstract: The flowsheet of Φ11. 8 mm cold drawn spring steel (/% : 0. 58C, 1. 77Si, 0. 79Mn, 0. 15Cr, 0. 015P, 0. 005S) is 80 t LD-LF-VD-hot rolled Φ12 mm coil-cold drawing process. The metallographic, mechanical and structural analyses on fracture of spring during coiling spring show that the surface quality of hot rolled products and mechanical properties of cold drawn spring steel are better； the large nonmetallic inclusions with size more than 20 μm in steel and the surface scratch during cold drawing process are causes of fracture of spring during coiling manufacture; the control of large inclusions produced in steel and the improvement of cold drawing lubrication process to avoid deep scratch are available to prevent occurrence of fracture.

摘要： Φ11.8mm冷拔60Si2MnA弹簧钢(/%:0.58C,1.77Si,0.79Mn,0.15Cr,0.015P,0.005S)的生产流程为80 t LD-LF-VD-热轧至Φ12 mm盘条-冷拔工艺。对卷簧时断裂弹簧进行金相、力学、组织分析表明,热轧材表面质量和冷拔后弹簧钢的力学性能良好,钢中存在20μm以上大颗粒非金属夹杂和冷拉过程产生的表面划痕是卷簧时弹簧断裂的诱因;控制钢中大颗粒夹杂物产生和改善冷拔润滑避免拔制过程产生深的划痕,可防止断裂发生。

关键词: 60Si2MnA弹簧钢, 卷簧断裂, 夹杂物, 表面质量