Stress relief annealing

Stress relief annealing reduces internal stresses in a workpiece.

Especially in metallic workpieces, stresses can occur in the material, for example due to uneven cooling during thermal processing methods such as casting, welding, forging or laser sintering, but also during heavy mechanical processing such as milling, turning or deep drawing. To prevent unwanted deformation during further processing or subsequent heat treatments, these stresses must be reduced.

To do this, the workpiece is brought to a suitable annealing temperature (below the start of austenite formation, in the case of steel usually below 650 °C) and held at this temperature for a long time. This reduces the yield strength and maximum tensile strength of the material. To put it simply, the resulting softer material is caused to flow plastically by the existing stresses, and the stresses are reduced. Subsequent slow and uniform cooling ensures that no new stresses build up which could deform or damage the workpiece.

Any deformations that may occur during stress relief annealing itself can be easily removed during subsequent finishing operations. By reducing stresses, the workpiece retains its shape even after further processing.  

Of course, Kittec also offers suitable furnaces for stress relief annealing. In our product overview you will find, for example, our range of annealing and hardening furnaces which are suitable for solution annealing depending on the requirements. In this context, we would like to refer in particular to our model series CLM and CLU, as well as to our bogie hearth furnaces of the CTH model series. You can also find suitable accessories, such as the hardening table, in our offer.

KITTEC CLU 70 Frontlader offen
KITTEC Härtetisch

Depending on the application, we can also develop completely individual solutions for you. Our special construction experts will be happy to advise you individually and help you find a suitable solution from our large product range.


For more than 40 years, we have been specialists in kilns for a wide range of applications, from private use to industrial production. We will be happy to advise you personally which of our kilns is best suited for your needs. Our selection of kilns varies in design, size and desired temperature range.