弹簧钢的热处理规范及硬度要求

钢号  淬火温度  淬火介质 硬度要求 回火温度 冷却介质  硬度要求   应用范围

65    780-830   水或油             400-600                      线径小于12-15mm的

                                                                螺旋弹簧、弹簧垫圈

65mn  810-830   油或水     >60     370-400    水      42-50     5-10mm的板簧片及

                                                                7-10mm的卷簧

50crv  850-870    油       >58     400-55     水      45-50     截面较大和较重要的

                                                                板簧片及螺旋弹簧

50crv  850-870    油       >58     370-420            45-52     300c以下工作的高温

                                                                弹簧

60si2mna 860-880  油       >60     500-520    水     hb363-444  厚度8-12mm的板簧片

耐热弹簧钢的材料选用和最高使用温度的热处理规范 

 钢号            最高使用温度   热成型(度)    淬火温度       回火温度

50crva               300         880-900      850-870油       430-500

4cr13                400         850-1050     980-1050空冷     540-560

冷拉18-8型不锈钢丝   400           冷卷                      去应力回火400c,15-60min

w18cr4v              600        1000-1200   1280-1290油或空冷    700

60si2mna             250         880-900      860-880油          350

胜百瑞常用弹簧钢的等温淬火规范

钢号      加热温度        等温淬火温度       等温保持时间          硬度hrc

t10a      800+-10           250-360             10-30              40-53

65        820+-10           320-340             15-30              46-48

65mn      820+-10         270 / 320-340         15-30           52-54 / 46-48

50crva    850+-10            300                30-45                52

60si2mna  87+-10             280                30-45                52

50crv钢气阀弹簧低温碳氮共渗(软氮化)与普通热处理后疲劳性能比较：

热处理工艺              断裂应变周次      断裂后残余变形(mm)     室内耐大气腐蚀试验

860c油淬,420c回火1h     1.78*10000             2.4       发黑后未上油,14天后出现锈斑

860c油淬,480c软氮化3h   >=100*10000            0.2                 850天以上未生锈

860c油淬,510c软氮化3h   >=100*10000            0.6                 850天以上未生锈

例;  压缩螺旋弹簧   50crv   43-50hrc   外径￠31.5   线径￠3.5    总高度50

工艺流程 ：  冷卷—定型处理—切断修正—淬火—矫正回火—检验修正—最后回火—检验、喷砂、表面处理。