... security, highly pressurized, widely used Typecarbon steel pipe welded pipe galvanized pipe, seamless steel pipe spiral steel pipe alloy pipe StandardASTM ... ,Q235,Q345,10#,45#,12CrMo, ,ST37 ,16Mn,Cr5Mo,15CrMoOD1/4''-24'',13mm-610mmWTSCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XXSUsagePetroleum, Smelting ...