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US 9,314,997 B2Granted
Plated steel sheet having plated layer with excellent stability for hot press molding
AssigneePosco
InventorIl-Ryoung Sohn
Life of this patent
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Abstract
The present invention relates to a plated steel sheet having a plated layer with excellent stability for hot press molding, and more specifically, to a plated steel sheet having a plated layer with excellent stability for hot press molding in which a LME (Liquid Metal Embrittlement) phenomenon caused by a zinc enrichment region included in the plated layer is suppressed during hot press molding.
Claims13
A plated steel sheet for hot press forming, comprising:
- a base steel sheet;
- an aluminum (Al)-rich layer formed above the base steel sheet and comprising 30% or more of Al;
- and
- a zinc plating layer formed on the Al-rich layer,
- wherein grains of the Al-rich layer comprise fifteen or fewer grains having a grain size of 500 nm or greater per 100 μm2 on average, and an area percentage of the Al-rich layer between the base steel sheet and the zinc plating layer is 88% or greater;
- and
- wherein the base steel sheet comprises a surface diffusion layer of a metal to a depth of 1 μm or less from a surface thereof, the metal releasing a smaller amount of Gibbs free energy than chromium (Cr) per mole of oxygen during an oxidation reaction.
4 more elements
Dependencies are inferred from the claim text.