60硅二锰弹簧扁钢说明:
牌号:60Si2Mn (GB/T 1222-1984)  弹簧钢
     特性及适用范围:                                                     
     是应用广泛的硅锰弹簧钢，强度、弹性和淬透性较 55Si2Mn稍高。适于铁道车辆、
 汽车拖拉机工业上制作承受较大负荷的扁形弹簧或线径在30mm以下的螺旋弹簧、也适于
 制作工作温度在250 ℃以下非腐蚀介质中的耐热弹簧以及承受交变负荷及在高应力下工
 作的大型重要卷制弹簧。                                                    
                                                                          
     化学成份:                                                           
     碳 C : 0.56～0.64                                                     
     硅 Si: 1.50～2.00                                                     
     锰 Mn: 0.60～0.90                                                     
     硫 S : ≤0.035                                                        
     磷 P : ≤0.035                                                        
     铬 Cr: ≤0.35                                                         
     镍 Ni: ≤0.35                                                         
     铜 Cu: ≤0.25                                                         
      力学性能:                                                           
     抗拉强度      σb     (MPa):≥1274(130)                               
     屈服强度      σs     (MPa):≥1176(120)                               
     伸长率        δ10     (％):≥5                                       
     断面收缩率    ψ       (％):≥25                                      
     硬度                       :热轧,≤321HB;冷拉+热处理,≤321HB          
                                                                       热处理规范及金相组织:                                               
     热处理规范: 淬火870℃±20℃,油冷; 回火480℃±50℃(特殊需要时,±30℃)。
     金相组织: 回火屈氏体。                                                
                                                                          
     交货状态:                                                           
     热轧钢材以热处理或不热处理状态交货，冷拉钢材以热处理状态交货。

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