US 12,435,385 B2
Plated steel sheet for hot press forming having excellent impact property, hot press formed part, and manufacturing method thereof
Seong-Woo Kim, Gwangyang-si (KR); Jin-Keun Oh, Gwangyang-si (KR); and Yeol-Rae Cho, Gwangyang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Filed by POSCO CO., LTD, Pohang-si (KR)
Filed on May 15, 2024, as Appl. No. 18/664,762.
Application 18/199,740 is a division of application No. 17/666,972, filed on Feb. 8, 2022, granted, now 11,732,323, issued on Aug. 2, 2023.
Application 17/154,177 is a division of application No. 16/470,762, granted, now 10,934,601, issued on Mar. 2, 2021, previously published as PCT/KR2017/014843, filed on Dec. 15, 2017.
Application 18/664,762 is a continuation of application No. 18/199,740, filed on May 19, 2023, granted, now 12,049,678.
Application 17/666,972 is a continuation of application No. 17/154,177, filed on Jan. 21, 2021, granted, now 11,274,357, issued on Mar. 15, 2022.
Claims priority of application No. 10-2016-0178236 (KR), filed on Dec. 23, 2016.
Prior Publication US 2024/0301526 A1, Sep. 12, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C21D 9/46 (2006.01); B32B 15/01 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 21/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C23C 2/02 (2006.01); C23C 2/12 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01)
CPC C21D 9/46 (2013.01) [B32B 15/012 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C22C 21/02 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C23C 2/02 (2013.01); C23C 2/0224 (2022.08); C23C 2/024 (2022.08); C23C 2/12 (2013.01); C23C 2/28 (2013.01); C23C 2/29 (2022.08); C23C 2/40 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C21D 2211/009 (2013.01); Y10T 428/12757 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A hot press formed part comprising:
a base material;
a plated layer comprising aluminum (Al) on the base material; and
a carbon-enriched region is formed in a surface layer region of the base material,
wherein the carbon-enriched region means a region which the carbon content is 110% or more of an average carbon amount (C0) of the base material,
wherein the surface layer region means a region from an interface between the base material and the plated layer to a depth of 200 μm wherein the interface between the base material and the plated layer means a point at which aluminum (Al) content is 1 wt %,
wherein the aluminum (Al) content is analyzed by a Glow Discharge Spectrometer (GDS) method, and
wherein a thickness of the carbon-enriched region is 150 μm or less.