| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel having excellent corrosion resistance and corrosion fatigue resistance without hydrogen embrittlement or degradation of the material strength, and its surface treatment method in which a treatment work can be easily performed at low cost. SOLUTION: In the steel having excellent corrosion resistance and corrosion fatigue resistance, a film is deposited on the surface of the steel, the ratio of the Al atom number to the total atom number of Fe, C, Al, P and O and Si, Mn and Cr which are selectively added thereto is≥0.5% in the means composition of the film, and the Al atom number in the mean composition of the film is larger than the Al atom number in the mean composition of the steel before the surface treatment. COPYRIGHT: (C)2007,JPO&INPIT
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