What can Dominial carbonize?

  • Dominial kan carboneren met een diepte van 0,1 tot 6 mm
  • We kunnen tot een afmeting van Ø 2600 * 3500 mm behandelen.
  • Onderdelen behandelen met een stukgewicht tot 20.000 kg.
  • EHT-curves maken met geavanceerde apparatuur.
  • Dominal heeft het proces volledig geautomatiseerd, wat betekent dat we laagdikte en koolstof percentage tijdens het proces kunnen bepalen.
  • Dominal beschikt over 10 Gasretort Carboneer ovens.

The process

Case hardening is classed as a thermochemical process. In this process, the surface layer of a component or tool is carburized by means of a medium that emits carbon and subsequently quenched. The effect of this is to improve the mechanical properties (e.g. wear characteristics) of the component’s surface layer. Quenching may be performed either directly at the carburizing temperature or following intermediate cooling and reheating to a material -specific hardness temperature. These are only two variants of all the possible temperature-time sequences that can be employed in case hardening.


Case hardening is generally performed at temperatures of between 880 and 980°C. After the carburized components have undergone hardening, tempering is generally required, to relieve any stresses created during hardening, and to achieve the required handling strength. Quenching media are either hot oil or hot salt baths. Partial case hardening is also possible, using suitable isolating methods.

Customer information required for heat treatment

The following information is required for performing case hardening:

Material designation

Case depth in mm (CHD)

Target values for surface hardness

Insulation requirements, where relevant (e.g. in the form of a workpiece drawing indicating sections that must not undergo hardening)

Benefits of this heat treatment

The purpose of case hardening is to give the surface layer of steel workpieces and tools a significantly greater hardness and to improve their mechanical properties. Case hardened components and tools are characterized by their increased resistance to wear, tough core, and increased bending fatigue strength. Such characteristics are of particular importance in gear components.

Suitable materials

Case hardening steels are construction steels with a relatively low carbon content, whose surface layer is generally carburized or carbonitrided prior to hardening. The carbon content of case hardening steels is generally below that of hardened and tempered steels, i.e. less than 0.25%.