The invention relates to an austenitic nickel-chromium-molybdenum alloy having high resistance to general corrosion, crevice, pitting and stress crack corrosion and also intercrystalline corrosion, consisting of (in % by weight): carbon: up to 0.01% silicon: up to 0.05% manganese: up to 0.50% phosphorus: up to 0.020% sulphur: up to 0.010% chromium: 14.0 to 18.0% molybdenum: 14.0 to 18.0% cobalt: up to 2.0% tungsten: up to 0.5% calcium 0.001 to 0.010% magnesium: 0.001 to 0.020% aluminium: 0.05 to 0.30% nitrogen: up to 0.02% iron: up to 3.0% copper: up to 0.5% titanium: up to 0.01% residue nickel and usual impurities due to melting, the sum of the contents (carbon+silicon+titanium) being limited to 0.05% at the most, and the sum of the elements (calcium+magnesium+aluminium) being adjusted within the limits 0.055 to 0.33%.