ORIGINAL SHEET FOR HOT-DIP GALVANIZATION OR ALLOYED HOT-DIP GALVANIZATION, PRODUCTION METHOD THEREFOR, AND HOT-DIP GALVANIZED STEEL SHEET OR ALLOYED HOT-DIP GALVANIZED STEEL SHEET

• Main Authors: Hiroshi IRIE, Minoru CHIDA
• Format: Patent
• Language: English; Spanish
• Published: 23.05.2017
• 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

Provided is a technology in which a reduction annealing method is used to efficiently produce an original sheet for high-strength hot-dip galvanization or high-strength alloyed hot-dip galvanization, said original sheet being useful as a raw material for producing a high-strength plated steel sheet with which the occurrence of non-plating is inhibited. In this original sheet for hot-dip galvanization or alloyed hot-dip galvanization, when the mapping intensity of Fe in the surface after reduction annealing, in a measurement field of view of 33.6 µmx41.4 µm, said mapping intensity being obtained using an electron probe microanalyser, is divided into 16 intervals of 15 from 0 to 240, the area occupied by a mapping intensity of 195 or more is at least 70%. Se proporciona una técnica en la que se usa un método de recocido de reducción para producir eficientemente un sustrato para galvanización por inmersión en caliente de alta resistencia o un sustrato para galvanización seguido por recocido por inmersión en caliente, que es una materia prima para producir una lámina de acero chapada de alta resistencia, que suprime la ocurrencia de puntos desnudos. El sustrato para galvanización por inmersión en caliente o galvanización seguida por recocido por inmersión en caliente de la presente invención cumple la siguiente condición: con intensidad de mapeo de Fe, que es obtenida por el uso de un microanalizador de sonda de electrones en un campo de medición de vista de 33.6 µm x 41.4 µm en la superficie después del recocido de reducción, de 0 a 240, se divide en 16 partes en un intervalo de 15, el área ocupada por una intensidad de mapeo de 195 o más has 70% o más.