... Specification:O.D.: 21mm-508mmThickness:.0.2-200mmLength: 3-12M Quality Assurance:1) Standard: Strictly according to ASTM,DIN,JIS, ... Advance.3) State of goods:lots of high quality steel pipe in stock.4) Quality Assured: ASTM,BS,EN,JIS,ISO certification.5 ... Thanks for your attention, and I am looking forward to building business relationship with you! Large diameter Hot rolled seamless steel pipe Q345B ...