Rolling bearing steel having a surface with a lower bainitic structure and a method for the production thereof
AssigneeSKF Engineering and Research Centre B.V.
InventorsJoacim Fogelstrom, John Michael Beswick, Aldan Michael Kerrigan, Han Ingemar Strandell
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Abstract
A method for producing a rolling bearing component, in which, before ustenizing, the steel is subjected to cold deformation and quenching is such that the bainitic structure is obtained; and a rolling bearing component produced by the method, such as a rolling bearing ring from 1C to 1,5Cr type series steel, in which at least the surface of the rolling bearing component has a bainitic structure and the service life of the bainitic structure is considerably increased over a component not subjected to cold rolling.
Claims9
Method for producing a 1C-1.5 Cr steel roller bearing ring, comprising:
- providing a tube blank having ferritic matrix structure;
- cold rolling the tube with a deformation of at least 30% at a temperature below 700° C.;
- separating said tube into rings;
- austenizing said rings;
- and
- quenching said rings, such that a bainitic structure results;
- wherein the steel rolling bearing ring produced by the method comprises, in weight %:
- 0.85-1.10 carbon, 0.005-0.6 silicon, 0.005-0.80 manganese, 1.25-2.05 chromium, 0.35 max nickel, 0.36 max molybdenum, and balance Fe and usual impurities.
Dependencies are inferred from the claim text.