US 12,344,924 B2
Hot stamped body
Shingo Fujinaka, Tokyo (JP); Daisuke Maeda, Tokyo (JP); and Yuri Toda, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/779,400
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Jan. 15, 2021, PCT No. PCT/JP2021/001334
§ 371(c)(1), (2) Date May 24, 2022,
PCT Pub. No. WO2021/145445, PCT Pub. Date Jul. 22, 2021.
Claims priority of application No. 2020-004883 (JP), filed on Jan. 16, 2020.
Prior Publication US 2022/0403490 A1, Dec. 22, 2022
Int. Cl. C22C 38/38 (2006.01); B21D 22/02 (2006.01); C21D 6/00 (2006.01); C21D 8/04 (2006.01); C21D 9/48 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/10 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/26 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01)
CPC C22C 38/38 (2013.01) [B21D 22/022 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0405 (2013.01); C21D 8/0426 (2013.01); C21D 8/0436 (2013.01); C21D 8/0463 (2013.01); C21D 9/48 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/10 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/26 (2013.01); C21D 2211/008 (2013.01); C23C 2/06 (2013.01); C23C 2/40 (2013.01)] 17 Claims
 
1. A hot stamped body comprising
a chemical composition consisting of: in mass %,
C: 0.06% or more to less than 0.20%,
Si: 0.010 to 1.00%,
Mn: 1.20 to 3.00%,
P: 0.100% or less,
S: 0.010% or less,
Al: 0.010 to 0.500%,
N: 0.010% or less,
Nb: 0.0010 to 0.020%,
Ti: 0 to 0.10%,
V: 0 to 0.10%,
Cr: 0 to 0.50%,
Mo: 0 to 1.00%,
B: 0 to 0.0100%,
Ni: 0 to 0.50%,
REM: 0 to 0.0100%,
Mg: 0 to 0.010%,
Ca: 0 to 0.0100%, and
Co: 0 to 2.0%,
with the balance: Fe and impurities, wherein
a microstructure includes, in area fraction, martensite: 85% or more,
a proportion of regions in the martensite where GAIQ values are 35000 or more to less than 45000 is 30 area % or more, and
a product of a tensile strength TS (MPa) and a maximum bending angle α according to VDA238-100 of German Association of the Automotive Industry, TS×α, is 105000 or more, and α is 75 or more.