Strip made of 6XXX alloy and manufacturing process

A method for manufacturing a coiled strip of aluminum alloy, comprising successively:

• a. Casting a plate by semicontinuous vertical casting,
• b. Homogenizing the plate at a homogenization temperature optionally between 500° C. and 600° C.,
• c. Transferring or forced cooling the plate thus homogenized directly to the hot roller,
• d. Hot-rolling the plate with a start temperature of hot rolling of a minimum of 350° C. and a maximum of 550° C. and an end temperature of hot rolling of a minimum of 250° C. and a maximum of 450° C., to obtain a strip with a final hot-rolling thickness of between 2.4 and 10 mm,
• e. Optionally cold rolling,
• f. Solution heat treatment and quenching,
• g. Pre-ageing obtained by coiling the strip at a pre-ageing temperature, the strip is not maintained at the pre-ageing temperature and then the coiled strip cools naturally to ambient temperature for a period of between 8 hours and 24 hours,
• h. Natural ageing,
• wherein the coiled strip has a composition, in wt %,
• Si:
• 1.00-1.50,
• Fe:
• <=0.30,
• Mn:
• <=0.30,
• Mg:
• 0.20-0.44,
• Cu:
• 0.80-1.50,
• Ti:
• 0.03-0.15,
• Cr:
• <=0.10,
• Zn:
• <=0.10,
• other elements:
• each <=0.05, together <=0.15,
• remainder:
• Al.