A method for manufacturing a high strength galvanized steel sheet including a Si- and Mn-containing steel sheet, as a base steel sheet, and having excellent coating appearance, corrosion resistance, coating peel resistance at severe forming, and formability and a high strength galvanized steel sheet are provided. A base steel sheet having a chemical composition comprising C: 0.03% to 0.35%, Si: 0.01% to 0.50%, Mn: 3.6% to 8.0%, Al: 0.001% to 1.000%, P ¤ 0.10%, S ¤ 0.010%, and the balance comprising Fe and incidental impurities, on a percent by mass basis, is subjected to annealing and galvanization treatment, wherein the maximum steel sheet temperature in an annealing furnace is 600°C or higher and 700°C or lower, the steel sheet transit time in a temperature region of the maximum steel sheet temperature of 600°C or higher and 700°C or lower is specified to be 30 seconds or more and 10 minutes or less, and the dew point in an atmosphere is specified to be -45°C or lower.
METHOD FOR MANUFACTURING HIGH STRENGTH GALVANIZED STEEL SHEET AND HIGH STRENGTH GALVANIZED STEEL SHEET
VERFAHREN ZUR HERSTELLUNG VON HOCHFEST VERZINKTEM STAHLBLECH UND HOCHFEST VERZINKTEM STAHLBLECH
PROCÉDÉ DE FABRICATION D'UNE TÔLE D'ACIER GALVANISÉE DE HAUTE RÉSISTANCE ET D'UNE TÔLE D'ACIER GALVANISÉE DE HAUTE RÉSISTANCE
2018-06-13
Patent
Elektronische Ressource
Englisch
IPC: | C23C Beschichten metallischer Werkstoffe , COATING METALLIC MATERIAL / B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / B62D MOTOR VEHICLES , Motorfahrzeuge / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS / C22C Legierungen , ALLOYS / C23F Nichtmechanisches Entfernen metallischer Stoffe von Oberflächen , NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES |
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