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????????ù??GB6479-2000??????????豸??????????????????????豸????????????????????????????20??16Mn??
12CrMo??12Cr2Mo???
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?????????豸?????????GB6479-86?????????????????-40~400?楨????????10~30Ma??????豸??????????????????????????
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????????????20# 16Mn??15CrMo,12CrMo??12Cr2Mo??

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20??16Mn/Q345??
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C
Si
Mn
P
S
Mo
Ni
20
0.17-0.24
0.17-0.37
0.35-0.65
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16Mn
0.12-0.20
0.20-0.60
1.20-1.60
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410-550
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490-670
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