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12Cr1MoV
P22(10CrMo910)
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15CrMo(P11??P12??STFA22)
13CrMo44

DIN17175-79
JISG3467-88
JISG3458-88??GB5310-95
GB9948-88
ASTMA335/A335m
ASTMA213/A213m

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