Method for heat-treating steel or cast iron components
AssigneeSKF GmbH
InventorJohann Volkmuth
Life of this patent
Estimating the term…
Abstract
A method for heat-treating a component of steel or cast iron, particularly a through hardening bearing steel component, involves heating the component to the austenitization temperature and holding the component at the austenitization temperature to achieve austenitization, rapidly quenching the component to approximately the martensite starting point (MS temperature) and holding the component at the bainite transformation temperature until partial bainite transformation occurs. After partial bainite transformation, the component is cooled down to and briefly held at room temperature, followed by short-cycle tempering.
Claims21
A method for heat-treating a through hardened bearing steel component comprising:
- heating the bearing steel component to austenitization temperature;
- maintaining the bearing steel component at said austenitization temperature;
- rapidly quenching the bearing steel component to approximately a martensite starting point temperature;
- maintaining the bearing steel component at a temperature for effecting partial bainite transformation;
- rapidly cooling the bearing steel component to room temperature after partial bainite transformation;
- briefly holding the bearing steel component at room temperature;
- and
- short-cycle tempering the bearing steel component.
A method for heat-treating a steel or cast-iron component comprising:
- heating the component to austenitization temperature and holding the component at said austenitization temperature;
- quenching the component and holding the component at a temperature to effect partial bainite transformation;
- rapidly cooling the component to room temperature after partial bainite transformation in the component has occurred;
- holding the component at room temperature;
- and
- short-cycle tempering the component.
Dependencies are inferred from the claim text.