Nitriding and Nitrocarburizing

Cranks are subjected to nitriding as a final process.

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

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.

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

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

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

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

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

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