Industry Trends & Engineered Solutions Library

The Unified Numbering System, Why Designate a Materials Composition?

The Unified Numbering System (UNS) for Metals and Alloys is an alloy identification system which was jointly developed by the ASTM International (formerly the American Society for Testing and Materials) and the Society of Automotive Engineers (SAE) to provide a means of correlating many internationally used metal and alloy numbering systems administered by various societies, trade associations and manufacturers.  The system provides the uniformity necessary for efficient indexing, record keeping and cross-referencing.

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