Steel and process for the manufacture of a part for ball...

Details Steel and process for the manufacture of a part for ball... Steel and process for the manufacture of a part for ball...

C - Chemistry, Metallurgy

22

C

C22C 38/18 (2006.01) C21D 8/10 (2006.01) C21D 9/40 (2006.01) C22C 38/34 (2006.01) F16C 33/62 (2006.01)

Patent

CA 2286380

Disclosed is steel used to manufacture a part for a ball bearing. The chemical composition of the steel in weight is as follows: 0.6 % ? C ? 1.5 %; 0.4 % ? Mn ? 1.5 %; 0.75 % ? Si ? 2.5 %; 0.2 % ? Cr ? 2 %; 0 % ? Ni ? 0.5 %; 0 % ? Mo ? 0.2 %; 0 % < Al ? 0.05 %; S ? 0.04 %; the remainder of the composition being iron and impurities resulting form the process. Said composition furthermore satisfies the following relations: Mn ? 0.75 + 0.55 x Si and Mn ? 2.5 - 0.8 x Si. A process for manufacturing a ball bearing part is also disclosed.

Acier pour la fabrication d'une pièce pour roulement dont la composition chimique comprend, en poids: 0,6 % C 1,5 %; 0,4 % Mn 1,5 %; 0,75 % Si 2,5 %; 0,2 % Cr 2 %; 0 % Ni 0,5 %; 0 % Mo 0,2 %; 0 % < Al 0,05 %; S 0,04 %; le reste étant du fer et des impuretés résultant de l'élaboration. La composition satisfaisant, en outre, les relations: Mn 0,75 + 0,55 x Si et Mn 2,5 - 0,8 x Si. Procédé pour la fabrication d'une pièce de roulement.

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