Abstract
Steel, used in from familiar products such as automobiles and electrical appliances to large structures such as buildings and ships, is inextricable and basic materials of our lives. Steel has made significant progress in both quantity and quality with the development of society. Galvanized steel has evolved most significantly in these 20 or 30 years, being recognized that the steel is the most suitable material for automobiles, with rapid increase in automotive production and emerging demand of anti-corrosion bodies for a background.In this paper, the author firstly would like to describe the development details of galvanized steel, particularly GA (Galvannealed Steel: Hot-dip Zn-Fe alloy steel) achieved through cooperative work among automotive companies, steel companies and paint companies in Japan. At present, galvanized steel became one of the biggest shipping steel products in Japan and in the world as well.If the strong demand for galvanized steel continues in the future like today, it is said that the zinc source will be depleted in 20 years. Aluminum is thought to be the most probable alternative element for zinc, but there are still several problems in its substitution. Eventually, as a tentative measure, only remedy for this matter is to save zinc resources and therefore the development of both hot-dip and electro galvanizing process which makes possible to reduce the zinc usage is required.
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