ISO 20431:2023

This document defines the quality requirements and recommendations applicable to heat treatment on mechanical parts intended to be used in the industry (e.g. car manufacturing, aerospace, pipeline systems, civil engineering equipment, earth moving machinery, agricultural equipment, naval industry, energy equipment, tooling, fasteners). This document provides a reference for quality audit and for the inspection of heat-treatment facilities, whether these are integrated or belonging to subprime contractors. This document can also be used as a basis for discussion and development of specifications. A description of the equipment calibration and the frequency of the controls is given in Annex A. An example of scoring table is given in Annex B. An example of audit report is given in Annex C. The different measuring chain testing methods (SAT) are presented in Annex D.