Galvanized steel sheet having excellent hardness and galling resistance
Provided is a galvanized steel sheet plated by vacuum deposition and, more specifically, to a galvanized steel sheet having excellent hardness and galling resistance, and a method for manufacturing same. The zinc coated steel sheet includes: a base steel sheet; and a zinc coated layer formed on the base steel sheet. The zinc coated layer is formed of a columnar structure, and a content of Mn included in the zinc coated layer is 0.1 to 0.4 wt %.
1. A zinc coated steel sheet having excellent hardness and galling resistance, comprising:
a base steel sheet; and
a zinc coated layer formed on the base steel sheet,
wherein the zinc coated layer is formed of a columnar structure, and a content of Mg included in the zinc coated layer is 0.1 to 0.4 wt %, and
wherein the zinc coated layer has zinc grains having an average size of 80 to 200 nm.
2. The zinc coated steel sheet having excellent hardness and galling resistance of claim 1 , wherein the zinc coated layer satisfies the following relational formula 1,
[Content of Mg in the zinc grain boundary (wt. %)]/[Content of Mg in the coated layer (wt. %)−0.1]≥0.95. [Relational expression 1]
3. A zinc coated steel sheet having excellent hardness and galling resistance, comprising:
a base steel sheet; and
a zinc coated layer formed on the base steel sheet,
wherein the zinc coated layer is formed of a columnar structure, and a content of Mg included in the zinc coated layer is 0.1 to 0.4 wt %, and
wherein the zinc coated layer satisfies the following relational formula 1
[Content of Mg in the zinc grain boundary (wt. %)]/[Content of Mg in the coated layer (wt. %)−0.1]≥0.95. [Relational expression 1]