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????????????? ??? ??????????????ˉ????????????????? ??????????????????????? ???? ??  ?? ??????(????????)(??) C Mn Si Cr Mo Ni Nb+Ta S P ?? ???? ???? 10 0.07-0.14 0.35-0.65 0.17-0.37 ??0.15   ??0.25   0.035 0.035 20 0.17-0.24 0.35-0.65 0.17-0.37 ??0.15   ??0.25   0.035 0.035 ???? 12QMo 0.08-0.15 0.40-0.70 0.17-0.37 0.40-0.70 0.40-0.55 ??0.30   0.035 0.035 15CrMo 0.12-0.18 0.40-0.70 0.17-0.37 0.80-1.10 0.40-0.55 ??0.30   0.035 0.035 ????? 1Cr2Mo ??0.15 0.30-0.60 0.50-1.00 2.15-2.85 0.45-0.65     0.030 0.035 1Cr5Mo ??0.15 ??0.60 ??0.50 4.00-6.00 0.45-0.60 ??0.60   0.030 0.035 1Cr19Ni9 0.04-0.10 ??2.00 ??1.00 18.00-20.00   8.00-11.00   0.030 0.035 1Cr19Ni11Nb 0.04-0.10 ??2.00 ??1.00 17.00-20.00   9.00-13.00 ??8C-1.00?? 0.030 0.035 ???1.?????????????0.25????       2.??????????ˉ???????????????????0.008????       3.10??20???У?????????????0.010???????????????????????????????????С?       4.?????????????????????