Hot Rolled Steel Square Pipe Quality: GB/T3091-2001 Size: Diameter from 1/2" to 4" Product Category : Metallurgy, Mineral & Energy Technique: Welded Specification : BS 1387/BS 4568, ASTM 106, ASTM A 53, GB/T 9711.1,EN 10255,EN 10219 HS code: 73063000 Out Diameter: 20mm to 219 mm Thickness: 0.8mm to 8.5 mm Length: as per customer's required Hot Dipped Galvanized Steel Pipe