Method for manufacturing press-hardened component with high productivity

• Main Authors: DRILLET PASCAL, BLAISE ALEXANDRE, STUREL THIERRY
• Format: Patent
• Language: Chinese; English
• Published: 04.10.2022
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

A method for manufacturing a non-stamped pre-alloyed steel coil, steel sheet or steel billet, comprising the following consecutive steps: providing a non-stamped pre-coated steel coil, steel sheet or steel billet consisting of a steel substrate covered with a pre-coating layer of aluminum or an aluminum-based alloy or an aluminum alloy, wherein the thickness of the pre-coat layer on each side of the steel coil, steel sheet or billet is between 10 microns and 35 microns, and then heating the non-stamped steel coil, steel sheet or billet in a furnace under an atmosphere comprising at least 5% oxygen up to a temperature [theta] 1 between 750 DEG C and 1000 DEG C for a duration t1 between t1 [minimum] and t1 [maximum] wherein: t1 [minimum] = 2,500/([theta] 1-729.5) and t1 [maximum] = 4.946 * 1041 * [theta] 1-13.08, the invention relates to a method for producing a non-stamped steel coil, steel sheet or billet, in which t1 represents the total duration in the furnace, theta1 is expressed in DEG C, t1 minimum and t