Standard: astm Place of origin: shaanxi china (mainland) Type: welded Steel grade: 300 Series certification: rohs Welding line type: erw Thickness: 0.3mm-15.24mm Outer diameter: 2mm-219mm Specification:astm b338, b337, b861 Material:gr1, gr2, gr3, gr5, gr9 Size:od 2-20mmthickness:0.2-10mm length:1500m