	US 12,252,765 B2
	Automotive door beam made of aluminum alloy extruded material
Takahiro Shikama, Yamaguchi (JP); Shinji Yoshihara, Yamaguchi (JP); Misuzu Yamamoto, Yamaguchi (JP); Yuki Tanaka, Hyogo (JP); Ryo Unoki, Hyogo (JP); and Takahiro Ozawa, Hyogo (JP)
Assigned to Kobe Steel, Ltd., Kobe (JP)
Appl. No. 17/439,028
Filed by Kobe Steel, Ltd., Kobe (JP)
PCT Filed Mar. 5, 2020, PCT No. PCT/JP2020/009512 § 371(c)(1), (2) Date Sep. 14, 2021, PCT Pub. No. WO2020/195690, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-064438 (JP), filed on Mar. 28, 2019.
Prior Publication US 2022/0154313 A1, May 19, 2022
Int. Cl. C22C 21/10 (2006.01); B62D 29/00 (2006.01); C22F 1/053 (2006.01)

CPC C22C 21/10 (2013.01) [B62D 29/008 (2013.01); C22F 1/053 (2013.01)]

4 Claims

1. A door beam of a motor vehicle, comprising a 7000 series aluminum alloy extruded material, the 7000 series aluminum alloy extruded material comprising:

Zn: 8.1 mass % to 9.0 mass %;

Mg: 1.3 mass % to 2.0 mass %;

Cu: 0.1 mass % to 0.7 mass %;

Si: 0.15 mass % or less;

Fe: 0.3 mass % or less;

Ti: 0.005 mass % to 0.2 mass %; and

at least one of Mn, Cr, and Zr: 0.1 mass % to 0.5 mass % in total, wherein contents of Mn, Cr and Zr satisfy Mn: 0 mass %, Cr: 0.25 mass % or less, and Zr: 0.25 mass % or less, respectively,

with the remainder being Al and impurities,

wherein

a Fe-based crystallized product is contained, and an average Cu content of the Fe-based crystallized product is 5.0 mass % or less, and

in the 7000 series aluminum alloy extruded material, an excess content of Zn that is a portion of the content of Zn in excess of a stoichiometric ratio of MgZn₂is 1.0 mass % or less, or an excess content of Mg that is a portion of the content of Mg in excess of the stoichiometric ratio is 0.3 mass % or less.