Galvanized rectangular steel pipe 1.Thickness: 1.5-32.0mm 2. Advanced Roller Extrusion ... .CE,ISO,ASTM A500,JIS ASTM A500 Galvanized Rectangular Steel Pipe 1. STANDARD:GB/T3094-2000, GB/T6728-2002, ASTM A500 ... , expressway, overpass, road fence, traffic signs.(3).Construction engineering: steel structure construction, sports venue, three-dimensional garage, exhibition hall.(4).Decoration ...