Stainless Steel Standards and Specifications
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Unified Numbering System
 Included in the tables are six-character designations under the Unified Numbering System (UNS) for the AISI numbered stainless steels.  The Unified Numbering System originated through a cooperative effort of the American Society for Testing and Materials and the Society of Automotive Engineers, and UNS numbers apply to all metals and alloys.  All stainless steels will be identified under this system with the letter "S" followed by five digits.
ASTM :  American Society for Testing and Materials ASME :  American Society of Mechanical Engineers
AMS :  Aerospace Material Specifications SAE :  Society of Automotive Engineers
Military :  United States Government ACI :  Alloy Casting Institute
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Last modified: June 02, 2017