C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/02 (2006.01) C22C 38/18 (2006.01) C22C 38/40 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01) F16F 1/02 (2006.01)
Patent
CA 2188746
The present invention provides a spring steel with excellent performance, characterized in that the spring steel is produced by making a spring steel contain an appropriate amount of at least one or more of Ti, Nb, Zr, Ta, and Hf, thereby generating fine inclusions including carbide, nitride ,sulfides and/or their complex compounds, to make the inclusions exert the effect of trapping diffusive hydrogen whereby the resistance to hydrogen embrittlement is enhanced, wherein the size and number of the coarse inclusions are regulated, thereby suppressing the decrease of the fatigue life. The spring steel can provide a valve spring or a suspension spring or the like, with enhanced strength and higher stress resistance, together with improved resistance to hydrogen embrittlement and fatigue.
Ibaraki Nobuhiko
Iwata Takashi
Nagao Mamoru
Nakayama Takenori
Nanba Shigenobu
Kabushiki Kaisha Kobe Seiko Sho Also Known As Kobe Steel Ltd.
Riches Mckenzie & Herbert Llp
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