The Method of developing high strength Hot Dip Galvanized Steel Sheet with good adhesion and high formability

摘要

The present invention relates to a method of manufacturing a high-strength, high-performance forming a hot-dip galvanized steel sheet used in automobiles for reinforcement.; Specifically, the carbon (C): 0.05~0.2wt%, silicon (Si): 0.2~2.0wt%, manganese (Mn): a cold-rolled steel sheet containing 0.2~3.0wt% by annealing in a hot dip galvanizing equipment 650 after the recrystallization annealing in the two-phase temperature range of ~900 ℃ and cooled at a rate of 2~100 ℃ / sec using a plasma mixture was kept at a temperature of 300 ℃ ~580 ℃ in 10 minutes or less of Si and Mn oxide film of the steel sheet surface 50~500nm etched back, aluminum (Al): 0.1~0.25wt% remainder with a plating, and then a rate of 2~30 ℃ / sec to Kane immersed in the plating bath, including unavoidable impurities and zinc (Zn) to cool to room temperature by preparing a steel organization of the retained austenite volume ratio of 2 to 20% high-strength, high-performance forming satisfying the hot-dip galvanized steel sheet, the content a method for producing the coating adhesion and formability with excellent high-strength hot-dip galvanized steel sheet in a single process line, It shall be.