Nitriding and Nitrocarburizing

Low temperature surface hardening process. (495-580°C)

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This process, also known as nitriding, is based on the principle of creating a hard layer on the surface by sending nitrogen atoms to the steel surface as interstitial atoms.

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If carbon is sent to the material surface along with nitrogen during diffusion, it is called ferritic nitrocarburization.

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There are different methods such as salt, gas and plasma nitration.

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A high cooling rate is not required for the hard layer to form.

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Aerospace parts, aluminum injection and extrusion, forging dies, many automotive parts are done by nitriding or nitro carburization.

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It can be applied to almost all steel groups.​

Reclamation & Manufacturing steels

42CrMo4, SAE 1040, SAE 4340​

Case hardening steels

16MnCr5, 18NiCrMo5​

Hot work tool steels

1.2344, 1.2365

Cold work tool steels

1.2379​

High speed steels​

1.3343, 1.3207​

Austenitic and martensitic stainless steels​

AISI316, AISI 440C​

Precipitation hardening stainless steels

17-4 PH​

cast iron​

gray cast iron​

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In the automotive industry, CQI-9 Table B is used for this heat treatment technique.

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