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 a steel structure for a steel component, such as a soft annealed steel component, a welding joint comprising the steps of welding the steel component to form a welding joint, 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, re-heating the steel component to a temperature of 950 to 1110° C., quenching the steel component to a temperature of above the martensite start temperature (Ms) to form bainite, and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite to bainite, re-heating the steel component to a temperature of at least 580° C. but below the Ac1 transformation temperature, and maintaining the steel component at that temperature for a holding time sufficient for the steel component to exhibit Brinell hardness number of between 215 and 320 HB10/3000, and cooling the steel component.

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 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 above the martensite start temperature (Ms) to form bainite, and maintaining the steel component at that temperature for a holding time sufficient for transformation of all austenite to bainite, e) re-heating the steel component to a temperature of at least 580° C. but below the Ac1 transformation temperature, and maintaining the steel component at that temperature for a holding time sufficient for the steel component to exhibit Brinell hardness number of between 215 and 320 HB10/3000, f) cooling the steel component.