Machined parts constitute a range of shapes and forms that may require several heat treatments to achieve specific mechanical properties.  Stress relieving is utilized prior to machining to stabilize part dimensions.  Full annealing and sub-critical annealing may be used to soften the part for aggressive machining or broaching operations.

After machining, carbon and alloy steel parts may be through hardened to achieve specific end use properties.  Carbon steel parts may also be carbonitride or carburize surface hardened.  The final dimensions may be restored after heat treatment by finish grinding.  Some heat treatment processes may be tailored to hold dimensions to reduce or eliminate final grinding.  Some machined parts are made from precipitation hardening alloys which require only age hardening after machining to achieve medium strength properties. 

Machined parts may be selectively heat treated by induction or flame hardening.  Post heat treatment finishing is typically accomplished by glass bead blasting.