... constructions, hot-water heating, war industry, fire control and environment protection, etc Note:Carbon steel: 10#,20#,A3, 20G.16Mn,ASTM ... :16MnR,Cr5Mo,12Cr1SMoVK,10CrMo910,15CrMo,12Cr2Mo1,A335P22,St45.8,A10bB flange,carbon steel flange,steel flange