The 10th edition of Metals & Alloys in the Unified Numbering System (UNS), jointly developed by ASTM International and SAE International, serves as an overall designation system for thousands of metals and alloys in commercial use. It provides a means of correlating many internationally used metal and alloy numbering systems currently administered by societies, trade associations, users and producers of metals and alloys. Specifications referenced include those from AA, ACI, AISI, AMS, ASME, ASTM, AWS, Federal, MIL, NACE, and SAE.

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