Bake-hardening galvanized steel sheet
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United States of America Patent
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Mar 20, 2018
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N/A
app pub date -
Nov 27, 2014
filing date -
Nov 28, 2013
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Abstract
A bake-hardening galvanized steel sheet having a base steel sheet and a coating layer formed on the base steel sheet, the base steel sheet having a specified chemical composition and a metallographic structure including a ferrite phase and a cementite phase, in which an average ferrite grain diameter is controlled to be 10 μm or more and 30 μm or less, and in which the surface area of the interface between ferrite and cementite per unit volume is controlled to be 1.0/mm or more and 10.0/mm or less, a hydrogen concentration in steel of the base steel sheet is controlled to be less than 0.1 ppm, and a zinc coating weight per unit surface area of the steel sheet is controlled to be 40 g/m2 or more and 100 g/m2 or less.
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