Aktiebolaget Skf

Ovako Steel Ab

Peter Neuman

Staffan Larsson

Walter Datchary

Thore Lund

Isabella Flodström

Ingemar Strandell

Steven Lane

Patrik Ölund

Tobias Meyer

Oliver Rösch

Berndt Mikael Sundqvist

Method for heat treating a steel component () comprising the steps of: a) carbonitriding the steel component () at a temperature of 930-970&#xb0; C., b) cooling the steel component (), d) re-heating the steel component () to a temperature of 780-820&#xb0; C. and d) quenching the steel component (). The method comprises the step of either e) performing a bainite transformation at a temperature just above the martensite formation temperature, transforming 25-99% of the austenite into bainite at the temperature and then increasing the temperature to speed up the transformation of the remaining austenite into bainite, or f) holding the steel component () at an initial temperature (T) above the initial martensite formation temperature (Ms), and lowering the initial temperature (T) to a temperature (T) that is below the initial martensite formation temperature (Ms) but above the actual martensite formation temperature during the bainite transformation.

Method and steel component

A method for heat treating a steel component, which comprises the steps of: (a) carbonitriding the steel component, and (b) austenitically nitrocarburizing the steel component.

A method for heat treating a steel component, which comprises the steps of: (a) carburizing the steel component with a carbon potential above 1.0, (b) carburizing the steel component with a carbon potential above 0.6, (c) quenching the steep component, and (d) subjecting the steel component to a bainitic treatment.

A method for heat treating a steel component, the method comprising steps of: (a) carbonitriding the steel component and (b) ferritically nitrocarburizing the steel component.

A bearing component formed from a bearing steel, wherein the component has an outer surface and comprises through-hardened bainite and/or martensite and has a substantially homogeneous chemical composition, at least a part of the bearing component having a compressive residual stress profile comprising &#x2212;25 to &#x2212;1000 MPa at the near surface, wherein the near surface is defined as a region 500 microns or less below the outer surface.

Method of heat treating a steel bearing component

A steel to be air-hardened as part of heat treatments such as hardening-and-tempering, induction hardening, carburizing, carbonitriding or nitriding comprising, in weight %: 

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Göteborg, Sweden

Peter Neuman