US 12,325,905 B2
Method for producing high-toughness, high-strength aluminum alloy extruded material with good hardenability
Yuuki Hamataka, Imizu (JP)
Assigned to AISIN KEIKINZOKU CO., LTD., (JP)
Filed by AISIN KEIKINZOKU CO., LTD., Imizu (JP)
Filed on Feb. 9, 2023, as Appl. No. 18/107,801.
Claims priority of application No. 2022-029782 (JP), filed on Feb. 28, 2022.
Prior Publication US 2023/0272514 A1, Aug. 31, 2023
Int. Cl. C22F 1/043 (2006.01); C22C 21/02 (2006.01); C22C 21/08 (2006.01); C22F 1/047 (2006.01)
CPC C22F 1/043 (2013.01) [C22C 21/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for producing an aluminum alloy extruded material, comprising:
casting a billet at a casting speed of 60 mm/min or more using an aluminum alloy,
the aluminum alloy containing, by mass: 0.50 to 1.0% of Mg, 0.80 to 1.30% of Si, 0.36 to 0.60% of Mn, 0.05 to 0.35% of Fe, 0.35% or less of Cu, less than 0.10 of Cr, less than 0.10% of Zr, less than 0.10% of Zn, 0.10% or less of Ti, and the balance being aluminum and unavoidable impurities,
the aluminum alloy having a stoichiometric Mg2Si content limited to 1.35 to 1.75% with excess Si limited to 0.33 to 0.85%, and a total Mn and Fe content of 0.41% to 0.95% by mass;
homogenizing the billet at 560 to 590° C. for 2 to 8 hours, followed by cooling the billet at a rate of 50° C./h or more;
preheating the billet at 400 to 550° C. and then extruding the billet into an aluminum alloy extruded material,
cooling the aluminum alloy extruded material immediately after extruding from 460 to 550° C. at an average cooling rate of 350° C./min or more; and
subsequently applying artificial aging treatment to the aluminum alloy extruded material.