Stress relieving is generally recommended as an aid to dimensional and stress stability as part of overall manufacturing the process after casting, cold working, heavy machining or fabrication,.
Although stress relieving is commonly included in the manufacture of components which require no further treatment after machining, it is also of advantage for many components which are to be subjected to other forms of heat treatment at later stages of manufacture. For example it is invariably included after heavy (rough) machining, and before final machining of rolls and shafts for flame and induction hardening, in order to eliminate the distortion which would occur from the relief of residual stresses during heating for surface hardening, helping to minimize the final level of distortion.
Holt Brothers can undertake stress relieving for a wide variety of material grades, component shapes, sizes, ranging up to 6m in length, and components up to 1.5m in diameter.
Stress relieving is generally performed at temperatures lower than those used for either Annealing, or Normalizing