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各钢种AC1和AC3根据化学成份的计算公式最好的办法是查阅“钢的临界温度参数手册”一类资料，我们的前辈已经为我们做了大量实验工作，常用钢数椐还是比较齐全的，而且可靠。借花献佛，转载如下UsefulEquationsForHardenableAlloySteelsAe1(°F)1333-25xMn+40xSi+42xCr-26xNiAe3(°F)1570-323xC-25xMn+80xSi-3xCr-32xNiAc1(°C)723-10.7xMn+29.1xSi+16.9xCr-16.9xNi+290xAs+6.38xWAc3(°C)910-203xsqr(C)+44.7xSi-15.2xNi+31.5xMo+104xV+13.1xWMs(°F)930-600xC-60xMn-20xSi-50xCr-30xNi-20xMo-20xWM10(°F)Ms-18M50(°F)Ms-85M90(°F)Ms-185Mf(°F)Ms-387Bs(°F)1526-486xC-162xMn-126xCr-67xNi-149xMoB50(°F)Bs-108Bf(°F)Bs-216CarburizedCaseDepth(in.)~.025sqr(t),for1700°FCarburizedCaseDepth(in.)~.021sqr(t),for1650°FCarburizedCaseDepth(in.)~.018sqr(t),for1600°F(t=timeinhours)转换式℃=5（°F－32）/9针对亚共析钢：Ac1（℃）=723-20.7Mn-16.9Ni+29.1Si+16.9Cr+290As+6.38W偏差值：11.5℃Ac3（℃）=910-203sqr(C)+44.7Si-15.2Ni+31.5Mo+104V+13.1W偏差值：16.7℃Ms（℃）=539-423C-30.4Mn-20Si-12.1Cr-17.7Ni-7.5Mo偏差值：25℃M10=Ms-10℃（±3℃）M50=Ms-47℃（±9℃）M90=Ms-103℃（±12℃）Mf=Ms-215℃（±25℃）Bs（℃）=830-270C-90Mn-70Cr-37Ni-83Mo偏差值：25℃B50=Bs-60℃（±25℃）Bf=Bs-120℃（±25℃）Ac3=910-203C0.5-13.2Ni+44.7Si+104V+31.5Mo+13.1WAc1=723-10.7Mn-16.9Ni+29.1Si+16.9Cr+290As+6.38W常用钢种的临界温度钢号临界温度（近似值），（ºC）Ac1Ac3Ar3Ar1Ms优质碳素结构钢08F，0810152025303540455060708515Mn20Mn30Mn4050Mn普通低合金结构钢16Mn09Mn2V15MnTi15MnV18MnMoNb合金结构钢20Mn230Mn240Mn245Mn225Mn2V42Mn2V35SiMn50SiMn20Cr30Cr40Cr45Cr50Cr20CrV40Cr732724735735735732724724724725727730725735735734726720736736734700~720736725718713715—725750710766740743721721768755874876863855840813802790780760766743737863854812790760849~867849~867865830~850850840804766770840770830797838815782771771840790854850840835824796774760751721743727695840835796768———779780756740727704720———703799—730693693704745680682685680680667680680682690690693—685682675689660——615635646610627627640——64563670267069366066078270038022040034032033033030535525021838CrSi20CrMn30CrMnSi18CrMnTi30CrMnTi76376576074076581083883082579075579870573074068070067065066035CrMo40CrMnMo38CrMoAl20CrNi40CrNi12CrNi312Cr2Ni420Cr2Ni440CrNiMo20Mn2B20MnTiB20MnVB45B40MnB40MnVB弹簧钢65708565Mn60Si2Mn50CrMn50CrVA55SiMnMoVNb滚动轴承钢GCr9GCr15GCr15SiMn755735800733731715720720732730720720725735730727730723726755750752744730745770800780940804769830780780774853843840770780774752743737765810775788775887—872750——790702—660660—736795770720700681730727695741770—746656721——695680730666660670575575—613625635690650639696693—689700—688550690700708271220270305250270