1. Size: Seamless: 1/ 2" through 24" ; Weld: 6" through 72" 2. Material: A234WPB, A420WPL6, MSSSP75 3. Standard: ASME B16.9, ASME B16.28, DIN, JIS, BS etc. 4. Thickness: SCH 5S through SCH XXS 5. Surface treatment: Transparent oil, rust-proof black oil or hot galvanized