Patent ID: 11897229
Assignee: POSCO CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. An aluminum alloy-plated steel sheet comprising:
a base steel sheet;
an alloy-plated layer formed on the base steel sheet; and
an unalloy-plated layer formed on the alloy-plated layer,
wherein the alloy-plated layer contains, by wt %, 35 to 50% of Fe, 1 to 20% of Zn, 0.1 to 1.5% of Si, and a balance of Al and unavoidable impurities,
the unalloy-plated layer contains, by wt %, 1 to 30% of Zn, 0.1 to 1.8% of Si, and a balance of Al and unavoidable impurities, and
an interface roughness Ra, between the alloy-plated layer and the base steel sheet is 2.5 μm or less.