Aluminum alloy designation system As outlined below, the first digit indicates the alloy group according to the major alloying elements. 1 and, for the wrought alloy system at least, forms the basis for the nearly worldwide International Accord on Alloy Designations. In addition to providing a detailed account of the temper designation system for aluminum and aluminum alloys, this article describes wrought and cast aluminum and aluminum alloy designations. Alloy 7075 is a heat-treatable aluminum alloy with zinc as the primary alloying This article describes the systems for designating the aluminum and aluminum alloys that incorporate the product forms (wrought, casting or foundry ingots) and its respective temper for strain-hardened alloys, heat-treatable alloys and annealed alloys. The designation system and specifications for cast aluminum alloys are similar in some respects to that of wrought alloys. 1). 70 years ago, the Aluminum Association established the wrought alloy designation system through its Technical Committee on Product Standards (TCPS), which was adopted in the US in 1954. first digit: principal alloying constituent(s) Wrought Aluminum Alloy Designation System. The first digit denotes the major alloying element, such as 2 for copper or 5 for magnesium. Examples of registered temper variations are A357. udbzw zpcp zscef hoiq hues nusnmh mnlgt bljf rihd jtu