TS EN ISO 4885

TS EN ISO 4885 is a vocabulary standard for the heat treatment of ferrous materials. Its purpose is to define the key terms used when discussing heat treatment of steel and cast iron products, so that the same concepts are understood consistently across technical communication, documentation, and related engineering work. As a vocabulary document, it focuses on terminology rather than prescribing a process route.

Why heat-treatment terminology matters

Heat treatment uses controlled thermal cycles to influence microstructure and, in turn, properties such as hardness, strength, ductility, and residual stress. Because terms like annealing, quenching, and tempering can describe very different thermal intents and outcomes, clear definitions are important in manufacturing, quality control, research, and standardization. In general technical practice, a vocabulary standard helps prevent ambiguity and supports a common language across design, production, and inspection activities.

What this document covers

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

In practice, this makes the standard a reference point for heat-treatment engineering, materials science, and manufacturing terminology. Its value lies in aligning concepts, not in describing a specific production recipe or test method.