... s requirement. Steel square pipe ,square tube ,rectangular steel pipeName:Square pipe ,square tube ,rectangular pipeTechnique:Seamless/welded Specification(mm) ... #,alloy steel,stainless steelExecutive standard:GB/T3094,6728-2002,ASTM A500,EN10219 etc.Surface:According to customer's demandPackaging ... equipment manufacturingMin.Order Quantity:1ton ERW Black Square Tube/ASTM A500 ERW MS Hollow Section