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US 11,078,564 B2Granted
Hot-dip galvanized steel sheet with excellent surface quality and resistance to low temperature brittle fracture
AssigneePosco
InventorSang-Heon Kim
Life of this patent
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Abstract
Provided is a hot-dip galvanized steel sheet including a base steel sheet and a hot-dip zinc-based plating layer formed on the base steel sheet. The hot-dip zinc-based plating layer includes a Zn single phase having an average equivalent circular diameter of 120 μm or less as a microstructure. In the Zn single phase, a Zn single phase having a crystal structure of which a {0001} plane is parallel to a surface of the steel sheet, is provided in an area fraction of 70% or less.
Claims5
A hot-dip galvanized steel sheet comprising:
- a base steel sheet;
- and a hot-dip zinc-based plating layer formed on a surface of the base steel sheet,
- wherein the base steel sheet includes:
- concave-convex portions formed on the surface thereof, and the concave-convex portions form a wave having a wavelength of 0.1 μm to 1 μm and a wave height of 0.1 μm to 0.5 μm, and
- wherein the hot-dip zinc-based plating layer includes a Zn single phase having an average equivalent circular diameter of 20 μm to 120 μm as a microstructure, and
- in the Zn single phase, a Zn single phase having a crystal structure of which a {0001} plane is parallel to the surface of the base steel sheet, is provided in an area fraction of 70% or less.
3 more elements
Dependencies are inferred from the claim text.