METHOD OF PRODUCING HOT-PRESSED STEEL

PROBLEM TO BE SOLVED: To provide a means of producing heat-treated steel suppressing the occurrence of scale of steel due to a heat treatment and having excellent weldability and coating adhesion. SOLUTION: The method of producing hot-pressed steel comprises a contact step and a hot press step. The...

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Bibliographische Detailangaben
Hauptverfasser:	NISHIHATA HITOMI, IMAI KAZUHITO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR 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 MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a means of producing heat-treated steel suppressing the occurrence of scale of steel due to a heat treatment and having excellent weldability and coating adhesion. SOLUTION: The method of producing hot-pressed steel comprises a contact step and a hot press step. The contact step comprises a contact step of bringing a surface treatment liquid containing an inorganic binder and a metal pigment in a medium into contact with a base material thereby forming a liquid layer comprising the surface treatment liquid on the surface of the base material and a drying step of drying the base material on the surface of which the liquid layer comprising the surface treatment liquid is formed through the contact step thereby forming a protective film on the surface of the base material, thus obtaining steel for heat treatment. The hot press step comprises a heating step of heating steel for hot press to a temperature equal to or above Ac3point and keeping the state for a prescribed time, a cooling step of cooling and hardening the steel for which heating treatment for the prescribed time is finished, and a press step of carrying out shaping work of the steel by pressing the steel having deformation resistance lowered by the heating in the heating step. The metal pigment contained in the surface treatment liquid contains 5-20 mass% zinc oxide powder, 10-25 mass% bronze foil or the like and no high temperature oxidation resistant metal powder per total of the metal pigment and the solid portion of the inorganic binder. COPYRIGHT: (C)2011,JPO&INPIT