... , Q235, Q275, Q345, 20#, 45#, Stainless steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint, ... , road fence, traffic signs.(3).Construction engineering: steel structure construction, sports venue, three-dimensional garage, exhibition ... curtain wall.(5).Transportation: automobile manufacture, ship manufacture, container, tricycle, tower crane.6. SPECIFICATION: SQUARE TUBE( ...