Abstract: Process for manufacturing a foil of ferritic stainless steel having a high aluminum content, which can be used in particular for a catalyst support in a motor-vehicle exhaust, wherein a ferritic stainless steel sheet of the following composition:0.005%<carbon<0.060%10%<chromium<23%0.1%<aluminum<3%0.003%<nitrogen<0.030%0.1%<manganese<2%0.1%<silicon<2%rare-earth elements in a proportion of between 0.03% and 0.15%, is subjected to:plating between two sheets of aluminum in order to obtain a laminate, rolling the laminate to a thickness of 0.03-0.25 mm to form a foil, static diffusion annealing the foil in a hydrogen atmosphere, and finish rolling greater than 20%.

Abstract: Ferritic stainless steel which resists oxidation at high temperature, of use in particular for a catalyst support structure, such as for example structures contained in the exhaust pipes of motor vehicles. This stainless steel comprises by weight:12 to 25% chromium, 4 to 7% aluminium, less than 0.03% carbon, less than 0.02% nitrogen, less than 0.22% nickel, less than 0.002% sulphur,less than 0.6% silicon, less than 0.4% manganese,the active elements selected from the group comprising cerium, lanthanum, neodymium, praseodymium, yttrium taken alone or in combination, at a content of lower than 0.08%, at least one stabilizing element selected from the group comprising zirconium and niobium,the zirconium and/or niobium contents satisfying the following conditions:for the zirconium,(C%/12+N%/14)-0.1.ltoreq.Zr.ltoreq.91 (C%/12+N%/14)+0.1for the niobium,93.times.0.8(C%/12)-0.1.ltoreq.Nb .ltoreq.93.times.0.8(C%/12)+0.15 and Nb<0.3%,for the zirconium and the niobium,91(N%/14)-0.05.ltoreq.Zr .ltoreq.91(N%/14)+0.