US 12,269,081 B2
Plated steel sheets for hot press forming having excellent hydrogen brittleness resistance and impact resistance, hot press formed parts, and manufacturing methods thereof
Sang-Heon Kim, Gwangyang-si (KR); Jin-Keun Oh, Gwangyang-si (KR); Seong-Woo Kim, Gwangyang-si (KR); and Sang-Bin Han, Gwangyang-si (KR)
Assigned to POSCO CO., LTD, Gyeongsangbuk-Do (KR)
Appl. No. 18/019,639
Filed by POSCO Co., Ltd, Pohang-si (KR)
PCT Filed Oct. 19, 2021, PCT No. PCT/KR2021/014586
§ 371(c)(1), (2) Date Feb. 3, 2023,
PCT Pub. No. WO2022/097965, PCT Pub. Date May 12, 2022.
Claims priority of application No. 10-2020-0148753 (KR), filed on Nov. 9, 2020.
Prior Publication US 2023/0286030 A1, Sep. 14, 2023
Int. Cl. C22C 38/02 (2006.01); B21D 22/02 (2006.01); B32B 15/01 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/00 (2006.01); C21D 9/46 (2006.01); C22C 33/04 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C22C 38/60 (2006.01); C23C 2/02 (2006.01)
CPC B21D 22/022 (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); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0278 (2013.01); C21D 9/0081 (2013.01); C21D 9/46 (2013.01); C22C 33/04 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C22C 38/60 (2013.01); C23C 2/02 (2013.01); C23C 2/022 (2022.08); C23C 2/0224 (2022.08); C23C 2/024 (2022.08)] 4 Claims
OG exemplary drawing
 
1. A plated steel sheet for hot press forming comprising:
a base steel sheet containing, by wt %, 0.14 to 0.5% of C, 0.001 to 1% of Si, 0.3 to 4% of Mn, 0.001 to 0.015% of P, 0.0001 to 0.02% of S, 0.001 to 0.1% of Al, 0.001 to 1% of Cr, 0.001 to 0.02% of N, 0.1% or less of Ti, 0.01% or less of B, 0.005 to 0.1% of Sb, and a balance of Fe and unavoidable impurities;
an aluminum or aluminum alloy plating layer provided on at least one surface of the base steel sheet; and
a Sb-rich layer provided between the base steel sheet and the plating layer,
wherein the plated steel sheet for hot press forming satisfies the following Relational Expressions 1-1 and 1-2:
[Relational Expression 1-1]

OG Complex Work Unit Math
[Relational Expression 1-2]

OG Complex Work Unit Math
[in Relational Expressions 1-1 and 1-2, Sbcoat represents an average content of Sb in the plating layer, and a unit thereof is wt %, Sbmax represents a maximum value of a content of Sb in the Sb-rich layer, and a unit thereof is wt %, and Δt represents a linear distance from a boundary between the plating layer and the Sb-rich layer to a point where Sbmax is measured, and a unit thereof is μm].