Method for heat treatment of steel component parts

• Main Authors: GIERTZ STEFAN, WEIMANN DANIEL ROMAN, BUSING, WIEBE, YAN PEI
• Format: Patent
• Language: Chinese; English
• Published: 19.04.2024
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A method for heat treating a steel component part, comprising: (i) providing a steel component part formed from a high carbon bearing steel; (ii) heating the component to a temperature equal to or higher than the austenitizing temperature and maintaining the component for a time sufficient to at least partially austenitize the steel; (iii) cooling the component part to a temperature of 200 DEG C to 270 DEG C and holding the component part for at most 6 hours, preferably for at most 4 hours, thereby transforming at least a portion of the austenite into bainite; (iv) cooling and/or quenching the constituent part to a temperature of-30 DEG C to 30 DEG C to form martensite; and (v) repeating steps (iii) and (iv) by heating the component part to a temperature of 200 DEG C to 270 DEG C and holding the component part for at most 6 hours prior to cooling and/or quenching the component part to a temperature of-30 DEG C to 30 DEG C, thereby transforming another portion of the austenite into bainite and forming tempered