standard ASTM,JIS,DIN OD 1/4inch - 24inch wall thickness SCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XXS StandardASTMA106 GRB /API5LGRB/ASTMA53GRBMaterialGRB 20# STEELOD1/4"-24",13mm-610mmWTSCH20,SCH40,SCH60,SCH80,SCH100,SCH120,SCH160,XXSUsageBoiler Use,water transport,Building,Machinery,Traffic,Aviation,Oil development ect.OD TolleranceD<48.3mm,+-0.4mm/-0.79mm ,D48.3-114.3mm,+-0.79%,D>114.3mm ± ...