ALLOYED HOT-DIP GALVANIZED STEEL SHEET

• Main Authors: KANETO, Taihei, MIYASHITA, Tomohiro, OKE, Takashi, KOMURO, Atsushi, KAWAZU, Nayuta
• Format: Patent
• Language: English; French; Japanese
• Published: 24.11.2022
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; 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

An alloyed hot-dip galvanized steel sheet according to the present disclosure has a base material steel sheet and a coating layer, wherein the base material steel sheet has a prescribed chemical composition in mass %, in a cross-sectional view of the base material steel sheet, the existence ratio ER of an prescribed internal oxide in line with a prescribed condition 1 is 40% or less, and the interval I between the internal oxides is 300 μm or more. The alloyed hot-dip galvanized steel sheet according to the present disclosure is excellent in appearance and the like. La tôle d'acier allié galvanisée par trempage à chaud selon l'invention comporte une tôle d'acier de matériau de base et une couche galvanisée. La tôle d'acier de matériau de base présente une composition chimique prédéterminée; dans une vue transversale de la tôle d'acier de matériau de base, le pourcentage d'existence (ER) d'oxyde interne dans des conditions spécifiques est inférieur ou égal à 40%, et l'intervalle (I) de l'oxyde interne est supérieur ou égal à 300 μｍ. Cette tôle d'acier allié galvanisée par trempage à chaud est excellente en termes d'aspect etc. 本開示の合金化溶融亜鉛めっき鋼板は、母材鋼板とめっき層とを有し、前記母材鋼板が、質量％で、所定の化学組成を有し、母材鋼板の断面を観察して所定の条件にて特定される内部酸化物の存在割合ＥＲが４０％以下であり、内部酸化物の間隔Ｉが３００μｍ以上である。本開示の合金化溶融亜鉛めっき鋼板は外観性等に優れる。