US 11,919,062 B2
Method of manufacturing hot press-formed member having excellent productivity, weldability and formability
Hong Gee Kim, Incheon (KR); and Hyun Sung Son, Incheon (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR)
Filed by POSCO Co., Ltd, Pohang-si (KR)
Filed on Jan. 19, 2023, as Appl. No. 18/098,945.
Application 18/098,945 is a continuation of application No. 17/008,827, filed on Sep. 1, 2020, granted, now 11,590,549.
Claims priority of application No. 10-2020-0085533 (KR), filed on Jul. 10, 2020; and application No. 10-2020-0101357 (KR), filed on Aug. 12, 2020.
Prior Publication US 2023/0158559 A1, May 25, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B21D 22/02 (2006.01); B32B 15/01 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 21/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/32 (2006.01)
CPC B21D 22/022 (2013.01) [B32B 15/012 (2013.01); C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/46 (2013.01); C22C 21/02 (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 38/32 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of manufacturing a hot press-formed member, the method comprising:
heating a blank of an aluminum-based plated steel sheet in a heating furnace;
removing the heated blank from the heating furnace and conveying the removed blank between an upper mold portion and a lower mold portion of a mold, mounted on a press, to be seated; and
performing a forming process after the upper mold portion of the mold is in contact with the seated blank,
wherein the heating furnace is a continuous heating furnace comprising section A, section B, and section C provided in a conveying direction of a blank,
heating in section A satisfies conditions specified by a figure ‘abcde’ having cumulative in-furnace maintaining times and in-furnace atmospheric temperature coordinates of approximately a(0.2 min, 750° C.), b(1.0 min, 750° C.), c(1.0 min, 800° C.), d(1.5 min, 900° C.), and e(0.2 min, 900° C.),
heating in section B satisfies conditions specified by a figure ‘fghi’ having cumulative in-furnace maintaining times and atmospheric temperature coordinates of approximately

OG Complex Work Unit Math
 and
heating in section C satisfies conditions specified by a figure ‘jklm’ having cumulative in-furnace maintaining times and atmospheric temperature coordinates of approximately

OG Complex Work Unit Math
a highest atmospheric temperature of section C is lower than a highest atmospheric temperature of section B,
t denotes a thickness of a blank and a unit thereof is millimeters (mm),
when the thickness t is 1.5 mm or less, and an atmospheric temperature of section B is more than 930° C. to less than 940° C.,
when the thickness t is greater than 1.5 mm, and an atmospheric temperature of section B is more than 940° C. to 960° C. or less, and
a plating layer of the blank has a thickness of 20 μm or more.