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?????ˉ??????? ?????ˉ????? GB5310--?й??????? ?????ˉ?????? ????????ˉ????????????????9.8Mpa???????????450??-650??????????????????????ú???????????????????????P??9.8MPa,450?棼T??650?棩 ?????ˉ????е???? ??? ???/???????(Mpa) ???????(Mpa) ????(%) 5310-95 20G 410~550 ?? 245 ?? 24 25MnG ?? 415 ?? 240 ?? 22 15MoG 450~600 ?? 270 ?? 22 15CrMoG 440~640 ?? 235 ?? 21 12Cr2MoG 450~600 ?? 280 ?? 20 12Cr1MoVG 470~640 ?? 255 ?? 21 ?????ˉ???????? ??? ??? ?????? C Si Mn P S Cr Mo Cu Ni   GB5310 20G 0.17-0.24 0.17-0.37 0.35-0.65 ??0.030 ??0.030 / / ??0.20 ??0.25 / 20MnG 0.17-0.24 0.17-0.37 0.70-1.00 ??0.030 ??0.030 / / ??0.20 ??0.25 / 15MoG 0.12-0.18 0.17-0.37 0.40-0.80 ??0.030 ??0.030 / 0.25-0.35 ??0.20 ??0.30 / 15CrMoG 0.12-0.18 0.17-0.37 0.40-0.70 ??0.030 ??0.030 0.80-1.10 0.40-0.55 ??0.20 ??0.30 / 12Cr2MoG 0.08-0.15 ??0.50 0.40-0.70 ??0.030 ??0.030 2.00-2.50 0.90-1.20 ??0.20 ??0.30 / 12Cr1MoVG 0.08-0.15 0.17-0.37 0.40-0.70 ??0.030 ??0.030 0.90-1.20 0.25-0.35 ??0.20 ??0.30