High-strength galvanized steel sheet and method for...

C - Chemistry – Metallurgy – 23 – C

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C23C 2/06 (2006.01) C21D 1/74 (2006.01) C21D 9/46 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01) C22C 38/58 (2006.01) C23C 2/28 (2006.01) C23C 2/40 (2006.01)

Patent

CA 2751593

Provided is a method for manufacturing a high-strength galvanized steel sheet, made from a steel sheet containing Si and/or Mn, having excellent exfoliation resistance during heavy machining. When a steel sheet containing 0.01% to 0.18% C, 0.02% to 2.0% Si, 1.0% to 3.0% Mn, 0.001% to 1.0% Al, 0.005% to 0.060% P, and 0.01% or less S on a mass basis, the remainder being Fe and unavoidable impurities, is annealed and galvanized in a continuous galvanizing line, a temperature region with a furnace temperature of A°C to B°C (600 <= A<= 780 and 800 <= B<= 900) is performed at an atmosphere dew-point temperature of -5°C or higher in a heating process.

L'invention concerne un procédé de fabrication d'une plaque en acier galvanisée à chaud de grande résistance qui comprend une plaque en acier contenant Si et Mn en tant que matériau de base et présentant une excellente résistance au pelage du revêtement galvanisé lorsqu'elle est soumise à un degré de traitement élevé. Lorsqu'une plaque en acier comprenant, en termes de % en masse, C (0,01 à 0,18 %), Si (0,02 à 2,0 %), Mn (1,0 à 3,0 %), Al (0,001 à 1,0 %), P (0,005 à 0,060 %), S (0,01 % ou moins), le reste étant Fe et d'inévitables impuretés, est soumise à des traitements de recuit et de galvanisation à chaud dans un équipement de galvanisation à chaud continue, lors d'un procédé de chauffage, le point de rosée de l'atmosphère est régulé à -5 °C ou plus dans une plage de températures dans un four supérieure ou égale à A °C, mais inférieure ou égale à B °C (600 = A = 780, 800 = B = 900).

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