Rectangular steel pipe 1)Grade: Q195-235 2)Size:10*20mm--400*500mm 3)Wall Thickness: 0.5 - 10 mm. Or customer's special size. 4)Galvanized steel pipes is available from us as per customers' requirements. 5)Standard: GB/T24001/T19001 ISO14001/9001 6) Packaging: Seaworthy packing, With edge protector, in bundle, Or as per customers' special requirements.