ZINC-COATED STEEL FOR PRESS HARDENING APPLICATION AND METHOD OF PRODUCTION

A zinc-coated steel may be produced by performing a pre-alloying heat treatment after galvannealing the steel and prior to the hot stamping the steel. The pre-alloying heat treatment is conducted at a temperature between about 850°F and about 950°F in an open coil annealing process. The pre-alloying...

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Bibliographische Detailangaben
Hauptverfasser:	THOMAS, GRANT, AARON, JANAVICIUS, PAUL, VALDAS, MUTSCHLER, RALPH, GARZA-MARTINEZ, LUIS, G
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	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 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 WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A zinc-coated steel may be produced by performing a pre-alloying heat treatment after galvannealing the steel and prior to the hot stamping the steel. The pre-alloying heat treatment is conducted at a temperature between about 850°F and about 950°F in an open coil annealing process. The pre-alloying heat treatment allows for shorter time at the austenitization temperature to form a desired a-Fe phase in the coating by increasing the concentration of iron. This also decreases the loss of zinc, and a more adherent oxide exists after hot stamping. L'invention concerne un acier recouvert de zinc obtenu par un traitement thermique de pré-alliage par recuit après galvanisation de l'acier et avant estampage à chaud de l'acier. Le traitement thermique de pré-alliage est effectué à une température comprise entre environ 850 °F et environ 950 °F dans un processus de recuit de bobine ouverte. Le traitement thermique de pré-alliage permet de réduire le délai à la température d'austénitisation pour former une phase a-Fe souhaitée dans le revêtement en augmentant la concentration en fer. L'invention permet également de réduire la perte de zinc et d'obtenir un oxyde plus adhérent après estampage à chaud.