C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/00 (2006.01) C21D 1/32 (2006.01) C21D 6/00 (2006.01) C22C 38/22 (2006.01) C22C 38/38 (2006.01) C22C 38/58 (2006.01) F16C 33/32 (2006.01) F16C 33/34 (2006.01) F16C 33/62 (2006.01)
Patent
CA 2517594
A steel material with excellent fatigue life and method of producing the material. The material contains, in mass percent, 0.7-1.1% of C, 0.2-2.0% of Si, 0.4-2.5% of Mn, 1.6-4.0% of Cr, not less than 0.1% and less than 0.5% of Mo, 0.010-0.050% of Al, with the balance being Fe and unavoidable impurities. The material is subjected to quenching and tempering. In the material, the diameter of a grain of residual cementite is 0.05-1.5 µm, and the diameter of a grain of former austenite is not more than 30 µm. Using the steel material as bearing steel can extend bearing life even under severe use conditions.
L'invention concerne une matière en acier possédant une excellente longévité à la fatigue et son procédé de production. Ladite matière comprend, en pourcentage en masse, 0,7-1,1 % de C, 0,2-2,0 % de Si, 0,4-2,5 % de Mn, 1,6-4,0 % de Cr, au moins 0,1 % et moins de 0,5 % de Mo, 0,010-0,050 % d'Al, le solde étant du Fe et les impuretés inévitables. La matière subit un refroidissement et un revenu. Dans la matière, le diamètre d'un grain de cémentite résiduelle est de 0,05-1,5 µm et le diamètre d'un grain de l'ancienne austénite est d'au plus 30 µm. L'utilisation de cette matière en tant qu'acier pour palier peut augmenter la durée de vie du palier dans des conditions d'utilisation particulièrement mauvaises.
Goto Masao
Harada Hisashi
Iwamoto Takashi
Matsuzaki Akihiro
Nishisaka Hisato
Jfe Steel Corporation
Jtekt Corporation
Koyo Seiko Co. Ltd.
Moffat & Co.
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