Rene 4 1 is a kind of age-hardening nickel alloy, which has high strength at high temperature, especially in the temperature range of 650-980 oc (1200-1800 of). The required mechanical properties can be customized by selecting various combinations of cold working and/or heat treatment. Rene 4 1 also has good oxidation resistance.

Rene 4 1 is also called haines R-4 1, pyrometer 4 1, Udimet R4 1.