Heat treatment

Together with our partners, we provide heat treatment services in accordance with the requirements of your project, both for aluminium and steel forgings. We offer different types of technological heat treatment processes, which are included in your technological documents. Our experts can advise you in the field of heat treatment of forgings to make your products reach the desired characteristics and comply with their application and the prescribed norms. Heat treatment includes technological procedures where the material is heated to a certain temperature and then (after a certain time) cooled down. The purpose of heat treatment is to acquire the best characteristics of the material required for a certain application. In some cases, heat treatment is performed in a special chemically active environment – a so-called heat and chemical treatment.
Toplotna Obdelava Kovinar Vitanje
Heat treatment of steel alloys:
Annealing is a heat treatment that consists of heating to a specific temperature, keeping the temperature and then slowly cooling to room temperature. We know several types of annealing: diffusion annealing, normalizing, soft annealing, re-crystallisation, and stress relieving. Tempering of steel is a heat treatment where steel is rapidly cooled from the tempering temperature, which prevents austenite to transform to pearlite. During this process, a microstructure called martensite is formed. This heat treatment hardens the steel – we can achieve steel harness levels of up to 65 HRC. Surface hardening of steel is a procedure for increasing the hardness of the product’s surface, while the core of the product stays soft and tough.
We achieve surface hardening of steel by:
  • Surface tempering,
  • Cementation,
  • Nitriding,
  • Carbonitriding,
  • Diffusion chrome plating, etc.
Heat treatment of aluminium alloys:
Most of the aluminium alloys can be heat treated or tempered. The exceptions are pure aluminium, binary Al-Mn and Al-Mg alloys, which can only be hardened with cold forming. The hardening process of aluminium alloys is similar to the hardening process of steel and is called ageing. Each alloy has its own prescribed ageing parameters. Annealing – a heat treatment process in furnaces that consists of heating to a specific temperature according to different types of forgings, achieving refinement of crystal grains, chemical homogenisation and, consequently, improvement of the forging’s microstructure. Quenching – the technological quenching process takes place in water. The purpose of quenching is to rapidly cool the forging, which preserves the target microstructure achieved during forging or annealing. Artificial or natural ageing – the technological ageing process can be performed naturally at room temperature or artificially in ageing furnaces. The process of artificial ageing follows very specific norms for individual aluminium alloys. It improves the mechanical properties of forgings and reduces the inner tension.
In cooperation with our partners, we also provide the following services: