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In-house heat treatment facility

Heat Treatment is an essential part of the complete service that we provide.

Whether Ferrous or Non Ferrous alloys, Heat Treatment is a critical stage of the process that enhances the mechanical properties of the material.

Our facility is operated by experienced Engineers and overseen by our team of on-site Metallurgists.

At Investacast we employ a range of Heat Treatment processes, either undertaken in-house or via approved sub-contractors, these processes include:-

  • Vacuum Solution Annealing
  • Hardening, Tempering, Normalising and Annealing
  • Precipitation Ageing
  • Aluminium Heat Treatment
  • Nitriding
  • Case hardening


Vacuum annealing is undertaken on various grades of stainless steels including duplex and precipitation grades. The vacuum protection that this process offers ensures that the component surface is protected throughout the high temperature process, critical for small intricate parts.


Hardening AND Tempering

The hardening and tempering process is used to improve the mechanical properties of steels. Heat treatment processes are also used to increase fatigue life, raise wear resistance and provide anticorrosion properties. Hardening is carried out by heating the work to elevated temperatures (usually over 780°C).  Tempering then toughens the hardened steel to remove any brittleness,

Precipitation Hardening

Precipitation Hardening (or Age Hardening) is the method employed for the hardening of certain alloys. Commonly, these are some types of stainless steel, aluminium and copper-based alloys. The precipitation hardening treatment follows a solution annealing treatment which is carried out at high temperature followed by one or more ageing to achieve the correct hardness.


 Normalising and annealing of steels conditions the steel so that it achieves a more homogenous structure that improves machinability and removes internal stresses that can build up during the casting and post casting stages of production.

Tempering of steels UKView Larger

Tempering of steels UK

Dedicated in house heat treatmentView Larger

Dedicated in house heat treatment

Heat TreatmentView Larger

Normalising of stainless steels