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Reference.org
Unified numbering system
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<p>The Unified Numbering System for Metals and Alloys (UNS) is an <a href="/facts/Alloy/I7w7WQWR">alloy</a> designation system widely accepted in <a href="/facts/North_America/djNjCQIl">North America</a>. Each UNS number relates to a specific <a href="/facts/Metal/PT8hNX6R">metal</a> or alloy and defines its specific <a href="/facts/Chemical_composition/vjo4uMQ0">chemical composition</a>, or in some cases a specific mechanical or <a href="/facts/Physical_property/ujcMUceW">physical property</a>. A UNS number alone does not constitute a full material specification because it establishes no requirements for material properties, heat treatment, form, or quality. </p>