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Recently, it has become more important to improve the corrosion resistance of automotive body panels, and the amount of coated steel sheets has been increasing for this application. Several types of coated steel sheet, such as Zincrometal, hot-dip galvanized steel sheets, galvannealed steel sheets and electrogalvanized steel sheets are widely available. Sumitomo Metal Industries have studied new coated steel sheets for automotive body panels, and have succeeded in the development of the new NiZn alloy plated product “SZ”, the deposit of which includes about 13% nickel. This paper discusses the plating conditions, production process, properties and performance of SZ.