ISO 18203:2016规定了测量表面硬化深度、表面硬化深度、渗氮硬度深度和获得的表面硬化深度总厚度的方法，例如热处理（火焰和感应硬化、电子束硬化、激光束硬化等）或热化学（碳氮共渗、渗碳和硬化、硬化和渗氮等）处理。

ISO 18203:2016 specifies a method of measuring the case hardening depth, surface hardening depth, nitriding hardness depth and total thickness of surface hardening depth obtained, e.g. thermal (flame and induction hardening, electron beam hardening, laser beam hardening, etc.) or thermochemical (carbonitriding, carburizing and hardening, hardening and nitriding, etc.) treatment.