Size:From 1/2" to 48" Wall Thickness:SCH10,SCH40,SCH80 Certificate: ISO9001-2008; API Spec.5L Standard: ASME,JIS,DIN Standard: ASME, ANSI, JIS, DIN,GB♣ Size: 1/2"--48"♣Material: carbon steel; alloy steel♣Surface treatment: transparent oil, rust-proof oil, hot galvanizing ♣Price: very competitive♣ Special design available carbon stel Equal T 4 inch 13,49 MM/Sch 160