| 摘要 |
PROBLEM TO BE SOLVED: To realize high strength spring steel good in hydrogen fatigue resistance and having tensile strength of >=1,700 MPa, and to provide its production method. SOLUTION: This high strength spring steel excellent in hydrogen fatigue resistance has a hydrogen trap site in which activation energy for hydrogen elimination is 25 to 50 kJ/mol, also, hydrogen trap capacity is >=0.2 wt.ppm and composed of at least one kind among oxides, carbides and nitrides containing one or more kinds selected from V, Mo, Ti, Nb and Zr and composite precipitates of two or more kinds thereamong.
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