What is Nitriding?
Certain parts that work in permanent friction risk wear and present ruptures with ease. This is the case, for example, of the crankshaft, the cylinder liners, pins and rotors, which must have high wear resistance at relatively high temperature. The piece can acquire this level of resistance through the technique called Nitriding.
Nitriding is indicated to obtain parts with higher surface hardness, to increase the resistance against wear, fatigue, corrosion, and heat. Steels that best lend themselves to this treatment are nitralloy steels, which are steels that contain chromium, molybdenum, aluminum and some nickel. In general, the nitriding is made after hardening and tempering. Thus, the nitrated parts do not need any further heat treatment, which contributes to a low level of distortion or warping.
Nitriding can be performed by gas or salt bath methods.