| abstract |
PROBLEM TO BE SOLVED: To provide a surface-treated steel sheet coated with a film which is excellent in heat resistance, lubricity and corrosion resistance and does not contain chromium which is an environmental load substance. SOLUTION: A film containing an inorganic compound as a main component, and its film thickness (A) is controlled within a range in which B / A ≦ 5 is satisfied with respect to a lubricant average particle diameter (B) imparting lubricity. A heat-treated surface-treated steel sheet coated with an inorganic film, wherein the inorganic film obtained by drying at a temperature 20 ° C. or more lower than the minimum film-forming temperature (MFT) of the lubricant is coated; Surface-treated steel sheet with excellent lubricity and corrosion resistance. The inorganic coating should contain a zirconium compound, a silica compound, or further one or more of a cerium compound, a phosphate compound, a fluorine compound, a Mn compound and a Ti compound. [Selection figure] None |