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These numbers indicate that in the manufacturing process elements have been added to the alloys and made a special group of these metals.
ANSI and AA
The ANSI and AA (Aluminum Association) naming system uses a four-digit numbering mechanism for used alloys and a three-digit numbering system for cast alloys. The first number represents the metal grouping and the most important alloying element added to the alloy.
What is the basis for designation Aluminum extensions?
In addition to alloy numbering, the type of heat treatment process or alloy fabrication process is also the basis for specifying an alloy. For this naming, English letters are used at the end of the alloy name, for example, AA 2024-T4.
This designation is called ANSI H35.1 under the American National Standard and is called the "Defined Temper System" and is used for all production methods. Depending on the production process, one of the letters is used, which we introduce in the following:
- F for no change and mode of production
- O for annealed mode
- H for hardened strain mode (cooled work)
- W for heat treatment of solubilization
- T is used for other heat treatments such as hard deposition in naming alloys.
For the first number in the HXX category
- H1 hardened strain without heat treatment
- H2 strain hardened and slightly annealed
- H3 strain hardened and stabilized by low-temperature heat treatment
The second number in the HXX category (if any) indicates the amount of stiffness obtained relative to the maximum stiffness in that stiffening operation.
- HX2 indicates a hardness of 4.1 of the maximum hardness.
- HX4 indicates a hardness of 2.1 of the maximum hardness.
- HX6 indicates a hardness of 3.4 maximum hardness.
- HX8 indicates maximum stiffness.
- HX9 indicates higher hardness than maximum hardness.
T is for the condition where the alloys have been heating treated. This mode indicates stable tempers (except for the F, O, or H modes, as opposed to the W naming mode).
- T1 cooled from a shaping process, with high temperature and aged naturally
- T2 cooled from a shaping process, with high temperature, the work cooled and aged naturally
- T3 heat treatment of soluble cooled and naturally aged work
- T4 Heat treatment of soluble and naturally aged type
- T5 is cooled by a high-temperature forming process and artificially aged
- T6 heat treatment of artificially solubilized and aged type
- T7 heat treatment of solubilized and stable type
- T8 heat treatment of solubilized type artificially cooled, and aged work
- T9 heat treatment of solubilized type, artificially aged and then cooled work
- T10 cooled by a high-temperature forming process, artificially cooled, and aged work
In some cases, T-category extensions have more than one digit, such as AA 224-T351 or AA 6061-T651, in which case the following should be considered. TX51 stands for stress relief after stretching after heat treatment of the first number (x number).