Carbonitriding, Carburising and Case Hardening

Processed in our sealed quench furnaces or salt pots.

Carbonitriding is a process performed in our sealed quench furnaces. The components are in a carbon rich atmosphere with added nitrogen. This gives a good surface hardness on a material that is a water quench steel but in this process is quenched in oil.

Case harden components need to be carburized first and we can do this either with our sealed quench furnaces or in cyanide salt.

Components are carburized by heating to between 880°c and 920°c and once equalized are left in the carbon rich atmosphere for a controlled time dependant on the depth of case required.

In the salt pots it generally takes 30 minutes for 0,25mm, 60 minutes for 0,5mm and 120 minutes for 0,75mm with the sealed quench cycle taking a little longer and both processes can economically give up to 1mm depth of case.

Carburized components are still in a soft condition and can now be re-machined to remove any material needed to create soft areas after quenching.

After refining the possible grain growth the components are heated to between 780°c and 800°c and quenched in water, brine or oil determined by the material and process used.

Once quenched it is possible to temper case hardened components to its required hardness. Temperatures tend to be lower than used for tool steels and are usually between 100°c and 300°c as any higher can rapidly reduce the surface hardness.

Vacuum from Huyton
Vacuum from Huyton