1、Metals&Alloys in the UNIFIED NUMBERING SYSTEM 11th Edition SAE HS-1086/2008 ASTM DS-56J A Joint Publication of SAE International American Society for Testing and Materials All technical reports,including standards approved and practices recommended,are advisory only.Their use by anyone engaged in in
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6、and Canada)Fa:724-776-0790 ISBN:978-0-7680-1977-3 Copyright 0 2008 SAE International Printed in USA Introduction to the Unified Numbering System The Unified Numbering System for Metals and Alloys(UNS)provides a means of correlating many internationally used metal and alloy numbering systems currentl
7、y administered by technical societies,trade associations,and those individual users and producers of metals and alloys.This system avoids the confusion caused by the use of more than one identification number for the same metal or alloy,and the opposite situation of having the same number assigned t
8、o two or more different metals or alloys.It provides the uniformity necessary for efficient indexing,record keeping,data storage and retrieval,and cross-referencing.A UNS designation is not,in itself,a specification,because it establishes no requirements for form,condition,property,or quality.It is
9、a unified identifier of a metal or an alloy for which controlling limits have been established in specifications published elsewhere.The UNS establishes 18 series of designations for metals and alloys.Each UNS designation consists of a single-letter prefix followed by five digits.In most cases the l
10、etter is suggestive of the family of metals identified:for example,A for aluminum,P for precious metals,S for stainless steels.Although some of the digits in certain UNS designation groups have special assigned meanings,each series of UNS designations is independent of the others in regard to the si
11、gnificance of digits.This permits greater flexibility and avoids complicated and lengthy UNS designations.Wherever feasible,and for the convenience of the user,identification“numbers”from existing systems are incorporated into the UNS designations.For example,carbon steel presently identified by the
12、 American Iron and Steel Institute as“AISI 1020 is covered by the UNS designation“G10200.”The UNS designation assignments for certain metals and alloys are established by the relevant trade associations which in the past have administered their own numbering systems;for other metals and alloys,UNS d
13、esignation assignments are administered by the SAE International.Each of these assigners has the responsibility for administering a specific UNS series of designations.Each considers requests for the assignment of new UNS designations,and informs the applicants of the action taken.UNS designation as
14、signers report immediately to the office of the Unified Numbering System for Metals and Alloys the details of each new assignment for inclusion into the system.For additional details on the UNS System,see the combined ASTM E527/SAE J1086,“Recommended Practice for Numbering Metals and Alloys,”include
15、d in the Appendix.The listed cross-referenced specifications are representative only and are not necessarily a complete list of specifications applicable to a particular UNS designation.vi i Preface to the Eleventh Edition The Unified Numbering System has been in use since 1974.The Eleventh Edition
16、contains more than 5,200 designations in an international identification system for metals and alloys.Since the Tenth Edition was published in 2004,more than 125 new UNS designations have been added.More than 340 changes have been made in a major updating of representative specification cross references and specification indices.The Index of Common Trade Names has been expanded with more than 4,500 additions.In total,approximately 5,000 changes have been incorporated into the Eleventh Edition of
