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ASTM International Steel Committee Preparing Revision of UNS Practice


ASTM International Committee A01 on Steel, Stainless Steel and Related Alloys invites interested parties to participate in a revision and update of ASTM standard E 527, Practice for Numbering Metals and Alloys (UNS). The standard is under the jurisdiction of the Committee A01 editorial subcommittee A01.91.
E 527 provides the basis for the practice of the Unified Numbering System for all major engineering metals and alloys, including steel and stainless steel, aluminum alloys, copper and copper alloys, zinc alloys, and many other families of metals and alloys. The standard also indicates the practice by which new UNS designations are assigned by the responsible industry organizations.
The UNS provides a means of correlating many internationally used numbering systems currently administered by societies, trade associations, international specifications organizations, and users and producers of metals and alloys. This prevents confusion caused by more than one identification number being used for the same material, as well as having one number assigned to two or more different materials. Practice E 527 provides the uniformity necessary for efficient indexing, record keeping, data storage and retrieval, and cross-referencing.
ASTM International standards are available from Customer Service (phone: 610/832-9585; or at For further technical information, contact: Lester Burgess, TSP/US bolt Mfg., Houston, Texas (phone: 713/230-2500; Committee A01 meets March 26, 2007, in St. Petersburg, Fla. For membership or meeting information, contact George Luciw, manager, Technical Committee Operations, ASTM International (phone: 610/832-9710;


Release #7536

November 1, 2006

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