| 摘要 |
PROBLEM TO BE SOLVED: To provide a coated and heat-treated steel material which has appropriate corrosion resistance after having been painted as an automotive member and can suppress the production of scale due to heat treatment, even when having been subjected to the heat treatment of heating at least a part of a steel material having a plated film on at least one side to a quenchable temperature range and subsequently cooling it. SOLUTION: The coated and heat-treated steel material is formed by conducting the heat treatment of heating at least a part of the steel material that has the aluminum-based plated film coated on at least one side and has been subjected to an alloying treatment at the Ac<SB>3</SB>point or lower, to the quenchable temperature range; and has a film in which iron and aluminum are alloyed, on the surface of at least one part of a portion that has been heat treated. The film has corrosion resistance and also can secure a lubricating function at a high temperature. COPYRIGHT: (C)2011,JPO&INPIT
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