Annealing and tempering, both common induction heating applications, are similar methods of applying heat to a conductive metal in order to improve ductility, reduce the hardness of metals which have become too brittle, and relieve residual stress.
In contrast to hardening, the annealing process involves a relatively slow heating step followed by gradual cooling. Annealing is used when the material must be softened as much as possible; tempering softens the metal but not to the full extent possible.
Annealing Incoloy Tubing: 2000°F, 1.4 inches/second
Annealing Steel Regulator Bases for a fuel injection system: 15 sec, 1950°F