???????????

????GB9948-2006???й???????

?????????

???????????????????????Ρ?????

?????????

????????????????????ˉ???????????????????????

??????????????????

????10??20??15CrMo??1Cr2Mo??1Cr5Mo??

????????????

????10??20<??????????????ι?????>

????15CrMo<??????????+?????ι?????+???>

????1Cr2Mo<??????????+?????ι?????+???>

????1Cr5Mo<???>

?????????????????????????-???X???X0.02466=KG/M

?????????????-???X???X0.02486=KG/M

12CrMo????

????GB9948-1988????????????????????????????????????ˉ??????????????????????????????????20??12CrMo??1Cr5Mo??1Cr19Ni11Nb???

????

12CrMo??????????

12CrMo

0.08~0.15

0.17~0.37

0.40~0.70

0.40~0.55

0.40~0.70