1/4''-24'',13mm-610mm,carbon steel pipe welded pipe galvanized pipe, ... ,10#,45#,12CrMo, ,ST37 ,16Mn,Cr5Mo,15CrMoOD1/4''-24'',13mm-610mmWTSCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XXSUsagePetroleum, Smelting, Boiler Use, Water ... long, high security, highly pressurized, widely usedMin order3 tons 1/4''-24'' carbon steel pipe