... : 10.3-406.4mm Standard: GB, BS, ASTM National Certificate Galvanized steel pipeGalvanized steel pipe/tubeOur company ... , Q345, STK5004. Standard: GB/T3091-2001, BS1378-1985, ASTM A53, EN5. Usage: used for low pressure liquids conveyance, ... --3.211/4"42.41--3.511/2"48.31.5--3.52"60.31.5--3.521/2" ... production lines, production GB/T12770-2002, BS1387-1985, ASTM A-53, GB/T3091-2001 other standard pipe, ...