Abstract: The 35Ni15Cr type iron-base Superalloy, being used in jet engine as turbine disks, has rather good high-temperature strength, microstructure stability, impact resistance, oxidation resistance and thermal fatigue resistance, all of these make it very favourable for making hot die and other hot sets, Industrial tests have :showed that the serving life these dies are tens-fold of that of the ordinary steel dies, and it results in the high productivity and low cost. Therefore, the 35Nil5Cr type iron-base superalloy is recommendable as a new kind of hot working die materials.