FIELD: metallurgy.
SUBSTANCE: invention relates metal sheet variants with chromium-free coating for external use. A coated metal sheet includes a metal sheet and upper cover film disposed thereon, which contains particles having micropores, as gloss control agent. While content of gloss control agent in upper coating film is from 0.01 to 15 % by volume, and coated metal sheet satisfies following expressions: (R + 2σ) / T ≤ 0.7; R ≥ 2.0; 9 ≤ T ≤ 19, where R (mcm) represents number average particle diameter of gloss control agent, T (mcm) represents thickness of film of the top coating film, and σ represents root-mean-square deviation of numerical distribution of particles by the size of gloss control agent.
EFFECT: proposed metal sheet retains specified gloss and corrosion resistance for a long period of time even when it is applied externally for a long period of time.
14 cl, 7 dwg, 6 tbl
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