... : Painting black,cap, in bundle6.Application: Petroleum,smelting,foodstuff,power,papermaking,Chemicalequipment,aviation,boilerheat,exchanger,gas ,construction,etc D)ERW steel ... : Painting black,cap, in bundle6.Application: Petroleum,smelting,foodstuff,power,papermaking,Chemicalequipment,aviation,boilerheat,exchanger,gas ,construction,etc D)ERW steel ...