... service life, high 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 GB ... ,XXSUsagePetroleum, Smelting, Boiler Use, Water transport, Building, Machinery, Traffic, Aviation, Oil development, etcOD ToleranceD<48.3mm,+-0.4mm/-0.79mm,D48 ...