TS EN ISO 4885

TS EN ISO 4885 is a vocabulary standard that defines the terms used in the heat treatment of ferrous materials. It provides a common technical language for steel and cast iron products and workpieces, helping reduce ambiguity when describing heat-treatment concepts, process stages and resulting material conditions in metallurgy and manufacturing contexts.

How the terminology is organised

The standard focuses on defining important terms rather than prescribing a heat-treatment procedure. Its vocabulary structure supports consistent use of concepts across technical documents and organisations. Annex A gives an alphabetical list of the terms defined in the document, together with their equivalents in French, German, Chinese and Japanese, which is especially useful for multilingual engineering communication. Table 1 presents the various iron-carbon (Fe-C) phases, providing a basic reference framework for understanding the structural behaviour of ferrous alloys.

Why this subject matters in heat treatment

In general technical practice, heat treatment is used to control properties such as hardness, strength, ductility and residual stress by applying controlled heating and cooling cycles. A vocabulary standard does not set a specific thermal cycle; instead, it aligns the meaning of the terms used to describe those cycles, the equipment actions and the material states involved. That makes it valuable in specifications, process documentation, training and cross-border communication.

Here, ferrous materials means products and workpieces of steel and cast iron. That boundary is important because many heat-treatment terms are shared across the ferrous materials family, but their practical interpretation depends on the phase behaviour and microstructural response of iron-carbon alloys.