Production method of galvannealed steel sheet having excellent formability and exfoliation resistance after adhesion
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United States of America Patent
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Feb 27, 2018
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N/A
app pub date -
Apr 14, 2015
filing date -
Oct 26, 2009
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Abstract
The production method of the galvannealed steel sheet includes: performing a hot dip galvanization on a steel sheet; performing an alloying and forming a galvannealed layer; performing a skin pass rolling at an elongation ratio of 0.3% or more; applying a treatment liquid on a surface of the galvannealed layer using a roll coater, and allowing the treatment liquid to react with the surface immediately after the application to form a mixed layer; in the forming the mixed layer: a first applied part is formed in the mixed layer using the protrusions of the roll coater; and a second applied part is formed in the mixed layer using the recesses of the roll coater; the second applied part having an attached amount of P of 20 mg/m2 or more, a surface area of the second applied part being 20% to 80% of a surface areas of the mixed layer.
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