... Advanced Roller Extrusion equipment line. 3.CE,ISO Cold Formed Rectangular Steel Tube 1. STANDARD:GB/T3094-2000, GB/T6728-2002 ... :Q195, Q215, Q235, Q275, Q345, 20#, 45#, Stainless steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint ... ; Or Other Anti-corrosive Treatment.4. TECHINQUE:Hot rolled, Cold rolled, ERW, High-frequency welded.5. APPLICATION:(1).Machinery ...