Cold Formed Rectangular Steel Tube 1. More Thickness: 1.5-32.0mm 2. Advanced Roller Extrusion equipment line. 3.CE,ISO Cold Formed ... Rectangular Steel Tube 1. STANDARD:GB/T3094-2000, GB/T6728-2002 ... ; Or Other Anti-corrosive Treatment.4. TECHINQUE:Hot rolled, Cold rolled, ERW, High-frequency welded.5. APPLICATION:(1).Machinery manufacture ...