The invention relates to an Al--Zn--Mg--Cu alloy worked product, characterised in that contains (percentage by weight) TABLE-US-00001 Mg 4.85 5.35 Mn 0.20 0.50 Zn 0.20 0.45 Si < 0.20 Fe < 0.30 Cu < 0.25 Cr < 0.15 Ti < 0.15 Zr < 0.15 the remainder being aluminium with its inevitable impurities.This product preferentially has an elongation at fracture A.sub.(LT) of at least 24% and an Rm.sub.(LT).times.A.sub.(LT) parameter of at least 8500. It shows a good stress and intergranular corrosion resistance.It may be used for welded constructions, particularly tankers, motor car bodywork, and industrial vehicles.