Method of manufacturing an Al—Mg—Mn alloy plate product having an improved corrosion resistance

US12091735B2 · kind B2 · utility

Assignee

• NOVELIS KOBLENZ GMBH · DE

Inventors

• Nele Mareike Knaack · Koblenz, DE
• Bernd Jacoby · Limburg, DE
• Achim Bürger · Grevesmühlen, DE
• Otmar Martin Müller · Koblenz, DE

Key dates

• Filing date: Jun 3, 2019
• Grant date: Sep 17, 2024
• Expiry date: Jun 23, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C2202/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method of manufacturing an Al—Mg—Mn aluminium alloy plate product having a final gauge in the range of 3 mm or more, the method comprising the steps of: (a) providing a rolling feedstock material of an aluminium alloy having a composition comprising of Mg 3.5-5.3% and Mn 0.20-1.2%; (b) preheating and/or homogenisation; (c) hot rolling of the rolling feedstock to a rolled final gauge; (d) a first cold working operation selected from the group consisting of (i) stretching in a range of 3% to 20%, and (ii) cold rolling with a cold rolling reduction in a range of 5% to 25%; (c) annealing of the cold worked plate at a temperature in a range of 200° C. to 280° C.; (f) a second cold working operation selected from the group consisting of (i) stretching in a range of 0.4% to 3%, and (ii) cold rolling with a cold rolling reduction in a range of 0.5% to 5%.