Provides a means of correlating many nationally used metal and alloy numbering systems currently administrated by societies, trade associations, and those individual users and producers of metals and alloys. It provides the uniformity necessary for efficient indexing, record keeping, data storage and retrieval, and cross-referencing. This Ninth Edition of Metals and Alloys in the Unified Numbering System includes: Introduction to the Unified Numbering System Index to the UNS Designations by Base Elements Listings of UNS Numbers Assigned to Date, with Description of Each Material Covered and References to Documents in Which the Same or Similar Materials are described Cross Index of Commonly Known Documents Which Describe Materials Same as or Similar to Those Covered By UNS Numbers Index of Common Trade Designations Reprint of 'Recommended Practice for Numbering Metals and Alloys' (ASTM E 527 and SAE J1086 JUL95).Descriptions and cross-references include federal and military specifications, as well as specifications from these organizations: AA (Aluminum Association) Numbers ACI (Steel Founders of America) Numbers AISI (American Iron and Steel Institute) including SEA Numbers (Carbon and Low Alloy Steels) AMS (SAE Aerospace Materials Specifications) Numbers ASME ( American Society of Mechanical Engineers) Numbers ASTM (American Society for Testing & Materials) Numbers AWS (American Welding Society) Numbers SAE (Society of Automotive Engineers) 'J' Numbers.