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

Claim 7:
8. A method for manufacturing an aluminum alloy-plated steel sheet used for hot press forming, the method comprising:
preparing a base steel sheet;
dipping the base steel sheet in an aluminum plating bath that contains, by wt %, 3 to 30% of Zn, 0.1 to 1.5% of Si, and a balance of Al and unavoidable impurities to obtain an aluminum-plated steel sheet;
performing cooling by supplying air heated to 200 to 300° C. to the aluminum-plated steel sheet after the aluminum plating to form an oxide film on a surface of the aluminum-plated steel sheet; and
obtaining an aluminum alloy-plated steel sheet by on-line alloying in which a heat treatment is performed after the cooling while maintaining the aluminum-plated steel sheet in a heating temperature range of 550° C. or higher and lower than 650° C. for 1 to 20 seconds.