... security, highly pressurized, widely used Typecarbon steel pipe welded pipe seamless steel pipe spiral steel pipe alloy pipe StandardASTM A106 GRB/API5LGRB/ASTMA53GRB DIN ANSI ... '',13mm-610mmWTSCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XXSUsagePetroleum, Smelting, Boiler Use, Water transport, Building, Machinery, Traffic, Aviation, Oil development, etcOD ...