METHOD FOR MANUFACTURING A HOT PRESS-MOLDED MEMBER

A method capable of stably mass producing a hot press-formed member having good corrosion resistance after painting from a zinc-based plated steel sheet by hot press forming comprises subjecting a zinc-based plated steel sheet to heat treatment by heating to a temperature region of 600 - 750° C at a...

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Bibliographische Detailangaben
Hauptverfasser:	ICHIKAWA MASANOBU, IMAI KAZUHITO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR 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 ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES 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 PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS PUNCHING METAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A method capable of stably mass producing a hot press-formed member having good corrosion resistance after painting from a zinc-based plated steel sheet by hot press forming comprises subjecting a zinc-based plated steel sheet to heat treatment by heating to a temperature region of 600 - 750° C at a rate of temperature increase up to 600° C of at most 50° C per second followed by cooling to 550° C or below, thereby obtaining a steel blank which has a zinc oxide layer in its uppermost surface portion and below it a zinc-iron alloy phase having an Fe content of at least 25 mass %. This steel blank is heated to a temperature of at least its Ac 3 point, then press forming is immediately started at a temperature of at least its Ac 3 point, and then it is rapidly cooled to manufacture a hot press-formed member which has surface region having a zinc oxide phase and an iron-zinc solid solution phase and not containing an intermetallic compound phase or a pure zinc phase.