高强度油淬回火钢丝用55SiCr弹簧钢线材的开发

Development of 55SiCr spring steel wire rod for high strength oil quenched and tempered steel wire

介绍了油淬回火钢丝用55SiCr弹簧钢线材的生产工艺流程,通过合理的成分设计及控制、采用低碱度精炼渣冶炼工艺、优化高线加热工艺制度及合适的控轧控冷工艺,成功试制出高强度油淬回火钢丝用热轧弹簧钢盘圆。结果表明:油淬回火钢丝用55SiCr钢的化学成分、非金属夹杂物、金相组织、晶粒度、脱碳层和力学性能满足客户要求;盘条经油淬回火后钢丝抗拉强度可以达到2000 MPa级,断面收缩率不小于40%。油淬回火钢丝通过冷卷生产汽车悬架弹簧,弹簧疲劳寿命满足客户要求。

The production process of 55SiCr spring steel wire rod for oil quenched and tempered steel wire was introduced.The hot⁃rolled spring steel coils for high⁃strength oil quenched and tempered steel wires were successfully trial⁃produced through the reasonable composition design and control,the use of low alkalinity refining slag smelting process,the optimiza⁃tion of high⁃wire heating process system and the appropriate controlled rolling and controlled cooling process.The results showed that the chemical composition,non⁃metallic inclusions,metallographic structure,grain size,decarburization layer and mechanical properties of 55SiCr steel for oil quenched and tempered steel wire could meet the customer′s requirements.The tensile strength of steel wire rod after oil quenched and tempered could achieve 2000 MPa grade,and the section shrinkage rate was higher than 40%.The oil quenched and tempered steel wire was cold rolled to produce the automobile suspension springs,and the fatigue life of springs could meet the customer′s requirements.