... equipment line. 3.Certification:CE,ISO SpecificationsSquare Steel Pipe 1. More Thickness: 1.0-22.0mm 2 ... Q275, Q345, 20#, 45#, Stainless steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint, 3PE ... .4. TECHINQUE:Hot rolled, Cold rolled, ERW, High-frequency welded.5. APPLICATION:(1).Machinery manufacture: glass ... service to solve your worries. High Quality Square steel pipe