Aluminium alloy strip optimized for forming and method for manufacture

An aluminium alloy strip comprising an aluminium alloy with the following composition in % by weight

• Si≤0.10%,
• Fe≤0.25%,
• 0.20%≤Mn≤0.30%
• 4.72%≤Mg≤4.95%,
• Cu≤0.10%,
• Cr≤0.02%,
• Ni≤0.01%,
• Zn≤0.10%,
• Ti≤0.04%,
• the remainder being Al and unavoidable impurities individually ≤0.05%, in total ≤0.15%,
• wherein the aluminium alloy strip has an average secondary phase density of less than 250/1000 μm2, wherein the average secondary phase density results from the total number of the secondary phases determined in at least 10 measuring fields in relation to the total measuring surface of all examined measuring fields;
• wherein the aluminium alloy strip has an average grain size of 15 μm to 30 μm measured according to ASTM E1382;
• wherein the aluminium alloy strip has an Ae value according to DIN EN ISO 6892 transverse to a rolling direction of less than 0.9%;
• and
• wherein the aluminium alloy strip has a mass loss of 13 mg/cm2 to 19 mg/cm2 after a thermal load of 195° C. for 45 minutes measured according to ASTM G67.