Standard: GB/T9711.1-1997, ASTM A53,BS1387-1985,JIS300 OD:21.3-323.9 WT:1.0-12.0[...]

Features: 1) Material: Q195, Q215, Q235 2) Thickness: 0.5 - 12mm 3) Size: 12 x 12mm to 400 x 400mm; 10 x 20mm to 300 x 500mm 4) Standard: GB/T6728, ASTM-A500 5) Other dimensions or shapes are available Packing: Roll/coil or custom packing[...]

O.D 21-273mm (1/2"-10") standard: ASTM A53 BS1387 GB/T3091[...]