	US 12,065,721 B2
	Method of manufacturing a 2xxx-series aluminium alloy plate product having improved fatigue failure resistance
Andreas Harald Bach, Koblenz (DE); Sabine Maria Spangel, Koblenz (DE); Philippe Meyer, Koblenz (DE); and Achim Bürger, Hohr-Grenzhausen (DE)
Assigned to NOVELIS KOBLENZ GMBH, Koblenz (DE)
Appl. No. 17/277,436
Filed by Aleris Rolled Products Germany GmbH, Koblenz (DE)
PCT Filed Oct. 23, 2019, PCT No. PCT/EP2019/078844 § 371(c)(1), (2) Date Mar. 18, 2021, PCT Pub. No. WO2020/089007, PCT Pub. Date May 7, 2020.
Claims priority of application No. 18203683 (EP), filed on Oct. 31, 2018.
Prior Publication US 2022/0033937 A1, Feb. 3, 2022
Int. Cl. C22C 21/18 (2006.01); C21D 9/46 (2006.01); C22C 21/14 (2006.01); C22C 21/16 (2006.01); C22F 1/05 (2006.01); C22F 1/057 (2006.01)

CPC C22C 21/18 (2013.01) [C21D 9/46 (2013.01); C22C 21/14 (2013.01); C22C 21/16 (2013.01); C22F 1/057 (2013.01)]

16 Claims

1. A method of manufacturing an AA2xxx-series aluminium alloy plate product, the method comprising the following steps:

(a) casting an ingot of an aluminium alloy of the AA2xxx-series;

(b) homogenizing and/or preheating the cast ingot;

(c) hot rolling the ingot into a plate product by rolling the ingot with multiple rolling passes, wherein when the plate product has reached an intermediate thickness of between 100 and 200 mm, at least one high reduction hot rolling pass is carried out with a thickness reduction of at least 15%, wherein each hot rolling pass before and after the high reduction hot rolling pass has a thickness reduction between 1% and 12%;

and wherein the plate product has a final thickness of less than 60 mm.