... . Advanced Roller Extrusion equipment line. 3.CE,ISO Cold Formed Rectangular Steel Tube 1. STANDARD:GB/T3094-2000, GB/T6728-2002, ... Stainless steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint, 3PE; Or Other Anti-corrosive Treatment. ... , container, tricycle, tower crane.6. SPECIFICATION: SQUARE TUBE(MM) THICKNESS (MM)SQUARE TUBE (MM)THICKNESS(MM)20*301.5-3.2590*1902 ...