... requirement. Steel square pipe ,square tube ,rectangular steel pipe erw square steel pipe Name:Square pipe ,square tube ,rectangular ... :Q235,Q345,20#,alloy steel,stainless steelExecutive standard:GB/T3094,6728-2002,ASTM A500,EN10219 ... strips bundledApplication Range:Apply to construction steel structure,automotive manufacturing,machinery manufacturing,bridge manufacturing,container skeleton, ...