DESIGNATION SYSTEMS

One advantage in using aluminum alloys and tempers is the universally accepted and easily understood alloy and temper systems by which they are known. It is extremely useful for both secondary fabricators and users of aluminum products and components to have a working knowledge of those designation systems. The alloy system provides a standard form of alloy identification that enables the user to understand a great deal about the chemical composition

and characteristics of the alloy, and similarly, the temper designation system permits one to understand a great deal about the way in which the product has been fabricated.

The alloy and temper designation systems in use today for wrought aluminum were adopted by the aluminum industry in about 1955, and the current system for cast system was developed somewhat later. The aluminum industry managed the creation and continues the maintenance of the systems through its industry organization, the Aluminum Association. The alloy registration process is carefully controlled and its integrity maintained by the Technical Committee on Product Standards of the Aluminum Association, made up of industry standards experts. Further, as noted earlier, the Aluminum Association designation system is the basis of the American National Standards Institute (ANSI) standards, incorporated in ANSI H35.1 and, for the wrought alloy system at least, is the basis of the nearworldwide International Accord on Alloy Designations. It is useful to note that the

international accord does not encompass casting alloy designations, so more variation will be encountered in international designations for casting alloys than for wrought aluminum alloys.

The Aluminum Association Alloy and Temper Designation Systems covered in ANSI H35.1 and Aluminum Standards and Data are outlined in this chapter.

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J. G. Kaufman

Kaufman Associates

Columbus, Ohio

Mechanical Engineers’ Handbook: Materials and Mechanical Design, Volume 1, Third Edition.

Edited by Myer Kutz

Copyright  2006 by John Wiley & Sons, Inc.

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