16Mn???????? 20#???????? 45#????????
???3????????????????????????????????????3???????????????????????????????????????????????????20????35????45????20G??16Mn??27SiMn??12Cr1MoV??15CrMo??35CrMo??42CrMo 40Cr 20Cr T91??ST45.8-3??SA106B??A335P22??A335P11??STFA23??10CrMo910???
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