The metal is heated to a required temperature range and held at that temperature for the specified amount of time, then cooled at a controlled rate.
The microstructure is converted to ferrite and spheroidal graphite. Elements that retard annealing, such as manganese and phosphorus, and alloying elements including chromium, nickel, copper and molybdenum are kept low to specific microstructure or change the molecular properties of the part. Annealing will also remove stress and align the molecular properties to increase strength. Annealing is often performed on a variety of metals to make magnetic properties more uniform. The Magnetic Anneal requires tight control of descending ramp rates and temperature uniformity.