Galvanized rectangular steel pipe 1.Thickness: 1.5-32.0mm 2. Advanced Roller Extrusion equipment line. 3.CE,ISO,ASTM A500,JIS ... ASTM A500 Galvanized Rectangular Steel Pipe 1. STANDARD:GB ... :Q195, Q215, Q235, Q275, Q345, 20#, 45#, Stainless steel, Seamless steel, Alloy steel.3. SURFACE:Bared, Galvanized, Oiled, Color Paint, 3PE; Or ...