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US 10,370,735 B2Granted
Heat treated steel product having high strength and excellent chemical conversion coating ability and method of production of same
AssigneeNippon Steel Corporation
InventorsHideki Matsuda, Koji Akioka, Kazuo Uematsu
Life of this patent
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Abstract
A steel product bent by heating to 600° C. or more, specifically a heat treated steel product having high strength and excellent chemical conversion coating ability which has scale with FeO content of 90% or more, having a thickness of 1 μm or less on the surface.
Claims4
Heat A heat treated steel product comprising a scale with FeO content of 90% or more, having a thickness of 1 μm or less on a surface,
- wherein a maximum value and a minimum value of a thickness of the scale are within ±10% of an average value of the thickness.
Dependencies are inferred from the claim text.