... 1.5-32.0mm 2. Advanced Roller Extrusion equipment line. 3.CE,ISO JIS Rectangular Tube 1. STANDARD:GB/T3094- ... Q345, 20#, 45#, Stainless steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint, 3PE; Or Other ... railway, aviation, expressway, overpass, road fence, traffic signs.(3).Construction engineering: steel structure construction, sports venue, three-dimensional garage ...