13CrMo44?????|15CrMo?????|Cr5Mo?????
12Cr1MoVP22(10CrMo910)T91??P91??P9??T9WB36?? Cr5Mo(P5??STFA25??T5??)15CrMo(P11??P12??STFA22)13CrMo44
DIN17175-79JISG3467-88JISG3458-88??GB5310-95 GB9948-88ASTMA335/A335mASTMA213/A213m
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10??20??35??45??
16Mn Q345B
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ASTM A333
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