1.Name: square steel pipe 2.Good quality and preferential price 3.Can be ... requirement. Black welded rectangular and square steel pipeSteel square pipe ,square tube ,rectangular steel pipeName:Square pipe ,square tube ,rectangular pipeTechnique:Seamless/welded ... to customer's requirementMaterial:Q235,Q345,20#,alloy steel,stainless steelExecutive standard:GB/T3094,6728-2002,ASTM A500,EN10219 etc. ...