Editing Case-hardening (section)

=== Nitriding ===
{{Main|Nitriding}}

Nitriding heats the steel part to {{convert|482|–|621|C|F}} in an atmosphere of ammonia gas and dissociated ammonia. The time the part spends in this environment dictates the depth of the case. The hardness is achieved by the formation of nitrides. Nitride forming elements must be present for this method to work; these elements include [[chromium]], [[molybdenum]], and [[aluminum]]. The advantage of this process is that it causes little distortion, so the part can be case-hardened after being quenched, tempered and machined.
No quenching is done after nitriding.