Die quenching method

• Main Authors: DRILLET PASCAL, GRIGORIEVA, RAISA, DUMINIC, FLORIN, NABI, BRAHIM, STUREL THIERRY
• Format: Patent
• Language: Chinese; English
• Published: 27.05.2022
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a press quenching method comprising the following steps: A. providing a steel sheet for heat treatment, optionally pre-coated with a zinc-based or aluminum-based pre-coating layer, B. depositing a hydrogen barrier pre-coating layer comprising chromium and not comprising nickel at a thickness of 10 nm to 550 nm, C. cutting the pre-coated steel sheet to obtain a blank, d. heat-treating the blank at a furnace temperature of 800 DEG C to 970 DEG C in an atmosphere having an oxidizing power equal to or higher than the oxidizing power of the atmosphere comprising 1% by volume of oxygen and equal to or lower than the oxidizing power of the atmosphere comprising 50% by volume of oxygen for a retention time of 1 minute to 12 minutes, such atmosphere having a dew point of-30 DEG C to + 30 DEG C, e. transferring the blank into a pressing tool, F. thermoforming the blank at a temperature of 600 DEG C to 830 DEG C in order to obtain a component, G. cooling the component obtained in step E) in orde