High-strength plated steel sheet having excellent plating properties, workability, and delayed fracture resistance, and method for producing same
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United States of America
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Mar 31, 2020
Grant Date -
Jan 11, 2018
app pub date -
Jan 5, 2016
filing date -
Jan 5, 2016
priority date (Note) -
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Abstract
Disclosed herein is a high-strength plated steel sheet having a plated layer on the surface of a base steel sheet and containing predetermined steel components. The steel sheet includes, in the order from the interface of the base steel sheet and the plated layer towards the base steel sheet: a soft layer having a Vickers hardness that is 90% or less of the Vickers hardness at a portion t/4 of the base steel sheet, where t is a sheet thickness of the base steel sheet; and a hard layer consisting of a structure which is mainly composed of martensite and bainite and in which the average grain size of prior austenite is 20 μm or less. The average depth D of the soft layer is 20 μm or greater, and the average depth d of an internal oxide layer is 4 μm or greater and smaller than D.
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