[en] Magnetic measurements were made on Type 316 stainless steel specimens that were neutron irradiated to fluences of 1.8 x 10²² neutrons/cm² at 425⁰C and 3.5 x 10²² neutrons/cm² (E greater than 0.1 MeV) at 500 and 600⁰C. A significant increase of magnetization was observed for the irradiated specimens compared to the unirradiated specimens. The shape of the magnetization vs field curves showed that the irradiated specimens contained many small superparamagnetic particles. The magnetic particles are assumed to be the ferrite phase although other possibilities cannot be excluded. The amount and distribution of the magnetic phase varied with pre-irradiation and post-irradiation heat treatment. The maximum value of magnetization was equivalent to 3.6 percent ferrite in a specimen annealed 100 h at 760⁰C before irradiation and 1h at 500⁰C after irradiation at 425⁰C. (U.S.)