各種彈簧鋼的熱處理規(guī)范及硬度要求

鋼號(hào)  淬火溫度  淬火介質(zhì) 硬度要求 回火溫度 冷卻介質(zhì)  硬度要求   應(yīng)用范圍

65    780-830   水或油             400-600                      線徑小于12-15mm的

                                                                螺旋彈簧、彈簧墊圈

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     截面較大和較重要的

                                                                板簧片及螺旋彈簧

50CrV  850-870    油       >58     370-420            45-52     300C以下工作的高溫

                                                                彈簧

60Si2MnA 860-880  油       >60     500-520    水     HB363-444  厚度8-12mm的板簧片

耐熱彈簧鋼的材料選用和最高使用溫度的熱處理規(guī)范 

 鋼號(hào)            最高使用溫度   熱成型(度)    淬火溫度       回火溫度

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

4Cr13                400         850-1050     980-1050空冷     540-560

冷拉18-8型不銹鋼絲   400           冷卷                      去應(yīng)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

常用彈簧鋼的等溫淬火規(guī)范

鋼號(hào)      加熱溫度        等溫淬火溫度       等溫保持時(shí)間          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鋼氣閥彈簧低溫碳氮共滲(軟氮化)與普通熱處理后疲勞性能比較：

熱處理工藝              斷裂應(yīng)變周次      斷裂后殘余變形(mm)     室內(nèi)耐大氣腐蝕試驗(yàn)

860C油淬,420C回火1h     1.78*10000             2.4       發(fā)黑后未上油,14天后出現(xiàn)銹斑

860C油淬,480C軟氮化3h   >=100*10000            0.2                 850天以上未生銹

860C油淬,510C軟氮化3h   >=100*10000            0.6                 850天以上未生銹

例;  壓縮螺旋彈簧   50CrV   43-50HRC   外徑￠31.5   線徑￠3.5    總高度50

工藝流程 ：  冷卷—定型處理—切斷修正—淬火—矯正回火—檢驗(yàn)修正—最后回火—檢驗(yàn)、噴砂、表面處理。