... bundle6.Application: Petroleum,smelting,foodstuff,power,papermaking,Chemicalequipment,aviation,boilerheat,exchanger,gas ,construction,etc D)ERW steel pipe1.Size:1/2-26inch ... ,chemical,power,gas,water,metallurgy,shipbuilding,construction,etc Steel Pipe Type:Seamless steel pipe/welded pipe/galvanized steel pipe/ square tube/spiral steel pipe/ERW steel ...