Typically used for rotating and structural parts that rely on high strength at cryogenic temperatures, AMS 5664 is perfect for turbine blades as it provides short-time service up to 1000 degrees F. AMS 5664 should be used in the aged condition to ensure the stability of mechanical properties, making use on naval ships a common application. AMS 5664 is known for its enhanced ductility and fracture toughness.