METHOD FOR RESTORING THE STRUCTURE OF A STEEL COMPONENT AFTER HEATING AND STEEL COMPONENT OBTAINED BY THE METHOD

摘要

The present disclosure relates to a method for restoring the steel structure of a steel component after heating the steps of heating the steel component to a temperature of at least 1100° C., quenching the steel component to a temperature above the martinsite start temperature (Ms), and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite, re-heating the steel component to a temperature of 950 to 1110° C., quenching the steel component to a temperature above the martensite start temperature (Ms), and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite, re-heating the steel component to a temperature of above the Ac1 transformation temperature and below 800° C., and maintaining the steel component at that temperature for a holding time sufficient for inititation and completion of spheroidization, and cooling the steel component when the spheroidization is completed, and maintaining a cooling rate of 20° C./h or below during cooling from the Ar3 transformation temperature and until the Ar1 transformation temperature is reached.

主权项

1. A method for restoring a steel structure for a steel component after heating characterized in that it comprises the steps of:
a) heating a steel component to a temperature of at least 1100° C., b) quenching the steel component to a temperature of above the martensite start temperature (Ms), and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite, c) re-heating the steel component to a temperature of 950 to 1110° C., d) quenching the steel component to a temperature of above the martensite start temperature (Ms), and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite, e) re-heating the steel component to a temperature of above Ac1 transformation temperature and below 800° C., and maintaining the steel component at that temperature for a holding time sufficient for initiation and completion of spheroidization, f) cooling the steel component when the spheroidization is completed, and maintaining a cooling rate 20° C./h or below during cooling from the Ar3 transformation temperature and until the Ar1 transformation temperature is reached.