Patent ID: 7335428

Claim:
A cooking vessel comprising a base made of a multilayer material and a side wall, said multilayer material comprising, in succession from the outside of the vessel to the inside of the vessel: an outer part, having a thickness e E , consisting of a layer of a ferromagnetic alloy having a Curie temperature of between 30 and 350° C. and a thermal expansion coefficient of greater than or equal to 6.5·10 −6 K −1 , the chemical composition of which comprises, in percent by weight: 32.5%≦Ni≦72.5% 5%≦Cr≦18% 0.1%≦Mn≦0.5% C≦1% optionally one or more elements chosen from Mo, V, Co, Cu, Si, W, Nb, and Al, the sum of the contents of these elements being less than or equal to 10%, the balance being iron and impurities resulting from the smelting, the chemical composition furthermore satisfying the following relationships: Cr−1.1Ni +23.25≦0% 45Cr+11Ni≦1360 Ni+3Cr≧60% if Ni≧37.5 Cr≧7.5 if Ni≦37.5 said layer of ferromagnetic alloy optionally being inserted between two layers of austenitic stainless steel, then a core, having a thickness e c , comprising at least one layer selected among aluminium, aluminium alloy and copper, and optionally an inner part having a thermal expansion coefficient of greater than or equal to 6.5·10 6 K −1 and possibly being covered with a non-stick or anticorrosion coating.