TS EN ISO 4885

TS EN ISO 4885 is a vocabulary standard for heat treatments of ferrous materials, bringing together the key terms and definitions used in this technical field. It supports a common language for the relationships between temperature, microstructure and properties in steel and cast iron processing.

Why heat-treatment terminology matters

Heat treatment is a family of controlled heating and cooling processes used to alter a metal’s internal structure and influence properties such as hardness, strength, ductility and wear behaviour. The focus of this standard is not the process itself, but the meaning of the terms used to describe it. That distinction matters because the same words can carry slightly different implications when applied to steel versus cast iron, especially where phase changes and resulting microstructures are concerned.

What this document covers

• Defines important terms used in the heat treatment of ferrous materials.
• Applies to ferrous materials, including steel and cast iron products and workpieces.
• Provides an alphabetical list of the defined terms in Annex A, together with their equivalents in French, German, Chinese and Japanese.
• Includes Table 1 showing various iron-carbon (Fe-C) phases.

As a vocabulary document, it is useful in specifications, training material, process documentation and engineering communication where consistent terminology is essential. Its practical value lies in reducing ambiguity and helping different teams interpret heat-treatment language in the same way.