回火后洛氏硬度（HRC）与回火温度（℃）的关系
钢号30354045506030Mn40Mn40Mn2*50Mn2*35SiMn*42Mn2V40Cr45Cr50Cr40CrSi*40CrMn*30CrMnSi*40CrV45CrV50CrV30CrMo35CrMo42CrMo40CrMnMo40CrNi*37CrNi3A*40CrNiMoA
25-3030-3535030052046054049055052056053058054049040054054042060056052060052058051062053065057063055058051062053005600560650560560440600550620580550580510570620
580
35-4040-45200＜16042035043037045038046039046040035030037032048040046040047043047042048042048040052045050043050045050045050045040048040050040050045046042050042054048045-5050-55290＜170310＜200320300330310360310200
200
270240300350200350200340200340200280230400330230200
340180320200320200380280200300200300400250340200300300420320
55-60180180250＜160＜180＜180220
180180＞60
180
35CrMoV38CrSi*38CrMoAiA45B50B40MnB*40MnVB45CrNi*65708565Mn55SiMn60Si2MnA50CrMn60Si2CrV30W4Cr2VAGCr6GCr9GCr15GCr9SiMnGCr15SiMnCr6WVT7(A)T8(A)T10(A)T12(A)
0630550420?650600570620620620660620
590550680450400450460500550550550600600
500520630360
360450530280
300400430＜200330320
200
430500500500520550550580
360450450450440490520500460
280380380380380
230300310330300
＜160230230250230380330
＜200＜170180
470420450400420
550-650℃回火400410420420420540370370380380
300350380350350450320332340340
680
550550580500500530460460480480250270270280280250250250250250
＜200＜180＜180＜200＜180＜180＜160＜200
580580580580
700530530540540650470470490490600420420430430
＜200
9Mn29Mn2VCr29Cr2Mo(W)9SiCr6SiCrCrSiCrCrMnCrWMnCr12Cr12MoV
400340280
500400320250480420320230700±10，工频淬后，700系调质温度520450380300530450380280480420350280
440370
490430340280480420350280520470250650600550620570530380650610
350
330400470400380380540440
300280320370250280＜200330
240220270250＜200＜2002003006500
＜180100＜200＜200＜250＜180170 ＜180
550(二次硬化峰值对应回火温度)
＜160＜200＜180
600
670
620630580590600650750740700
530580590530540540600700670710
0
WW？CrW59CrWMn6SiMnV5CrMnMo5CrNiMo3Cr2W8V8Cr3Cr4W2MoVW18Cr4VW9Cr4V2
W12Mo3Cr4V3Co5SiW12Mo9Cr4VCo8
620
700
5506206005800610500570530520550700580450520470470450630510
220
550±10℃（三次回火）570±10℃（三次回火）
720700
680670
W6Mo5Cr4V2W6Mo5Cr4V3AlW9Cr4V2Co10W10Cr4V5Co51Cr132Cr133Cr134Cr139Cr18Cr181Cr17Ni215/20渗碳后15Cr/20Cr渗碳后20CrMnTi渗碳后20CrMnMo渗碳后12CrNi4(A)渗碳后18Cr2Ni4W(A)渗碳后20MnTiB渗碳后30CrMnTi渗碳后35CrMnTi
ZG35ZG45ZG55ZGMnBZG40MnZG40Cr
580600620630
550560600610
500520570580
570±10℃（三次回火）560±10℃（二次或三次回火）
450540550
＜400＜500500580560
＜400320300
220250＜150＜200
650-700550230-500
350380
280330
220240240240240240240240＜180
＜160＜180＜180＜180＜200＜180＜180
400310
600-650350-400500-550
400450
参看序号4参看序号6340280
参看序号10
参看序号15
180
注：
1）有“*”者表示回火脆性较大，通常不在250-400℃间回火； 2）回火温度依硬度要求的中值偏上而定；
3）80号钢的550±10℃二次回火系1030±10℃淬火作热冲模；中下限温度为冷冲模淬火，仅低温回火。
备注以下为碳素及低合金钢
水冷回火作弹簧回火
以下为弹簧钢
以下为轴承钢
以下为工具钢、模具钢
＜1000℃淬火 ＞1000℃淬火960-1030℃淬火1050-1130℃淬火
550±10二次作热冲模以下为高速钢
以下为不锈钢
以下为渗碳钢
以下为铸钢
