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US 12,534,793 B2Granted
Method of heat treating a steel component
AssigneeAktiebolaget Skf
InventorsKarl Åke Staffan Larsson, Marica Ersson
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Abstract
The present invention provides a method of heat treating a steel component including the sequential steps of: (a) carbonitriding the steel component; (b) quenching the steel component; (c) optionally tempering the steel component; and (d) ferritically nitrocarburizing the steel component.
Claims17
A method of heat treating a steel component comprising the sequential steps of:
- carbonitriding the steel component with a constant ammonia flow/percentage concentration of 15% at a temperature below 970° C.;
- after the step of carbonitriding and before ferritically nitrocarburizing, quenching the steel component in an oil bath;
- after the step of quenching, ferritically nitrocarburizing the steel component.
A heat-treated steel component treated by the method of heat treating a steel component having the sequential steps of:
- heating the steel component from an initial room temperature of approximately twenty degrees Celsius to a carbonitriding temperature;
- carbonitriding the steel component while the steel component is at the carbonitriding temperature, wherein the carbonitriding of the steel component is accomplished with a constant ammonia flow/percentage concentration of fifteen percent (15%);
- after the step of carbonitriding and before the step ferritically nitrocarburizing, quenching the steel component for a predetermined duration sufficient to return the steel component to the initial room temperature;
- after the steps of carbonitriding and quenching, ferritically nitrocarburizing the steel component, wherein the heat-treated steel component comprises or constitutes a rolling element or roller, or an inner or outer ring of a bearing.
1 more element
Dependencies are inferred from the claim text.