The UNS number (short for “Unified Numbering System for Metals and Alloys”) is a systematic scheme in which each metal is designated by a letter followed by five numbers. It is a composition-based system of commercial materials and does not guarantee any performance specifications or exact composition with impurity limits. Other nomenclature systems have been incorporated into the UNS numbering system to minimize confusion. For example, Aluminum 6061 (AA6061) becomes UNS A96061.
The database contains the complete limiting composition of an alloy, including minimum and maximum values specified for each element, when available. Values are almost always based on the Weight Percentage of each constituent element. If any part of the composition range overlaps with any part of the range that you are searching for, then a match is established. For example, if you are searching for alloys with a chromium content of 20-25%, then one of the alloys returned will be Nimonic Alloy PK33, with a specified chromium content range of 16-20%.
The following abbreviations and acronyms are often used within the metals industry. Many are acronyms of standards institutions and professional societies, but test methods and metals applications are also represented.
Aluminum anodizing is an electrochemical process in which an oxide (anodic) layer is chemically built on the surface of the metal. This oxide layer acts as an insulator and can be dyed in a wide variety of colors. Anodizing provides surface corrosion protection along with an excellent substrate for decorative finishes.