... Surface:Hot galvanized, Cold galvanized Key word: electrical resistance weld steel pipe Specification Typeelectrical resistance weld ... STPT42,STB42,STS42,STPT49,STS49Applicationpetroleum, construction ,shipbuilding, smelting, aviation, power, foodstuff, papermaking, chemical, medical equipment, boiler ... equipmentsPacking&Transportation Company electrical resistance weld steel pipe