| Specification | AMS-A-21180 | |||
|---|---|---|---|---|
| Form | Casting | |||
| Temper | T6 | |||
| Location Within Casting | Designated area | Nondesignated area | ||
| Strength Class Numbera | 1 | 2 | 10 | 11 |
| Basis | S | S | S | S |
| Mechanical Propertiesb,c: | ||||
| Ftu, ksi: | 45 | 47 | 45 | 40 |
| Fty, ksi: | 35 | 38 | 34 | 30 |
| Fcy, ksi: | 35 | 38 | 34 | 30 |
| Fsu, ksi | 28 | 29 | 28 | 25 |
| Fbrud, ksi: | ||||
| (e/D = 1.5) | 77 | 81 | 77 | 69 |
| (e/D = 2.0) | 96 | 101 | 96 | 86 |
| Fbryd, ksi: | ||||
| (e/D = 1.5) | 55 | 60 | 54 | 47 |
| (e/D = 2.0) | 65 | 71 | 63 | 56 |
| e, percent | 4 | 3 | 4 | 3 |
| E, 103 ksi | 10.5 | |||
| Ec, 103 ksi | 10.7 | |||
| G, 103 ksi | 4.0 | |||
| μ | 0.33 | |||
| Physical Properties: | ||||
| ω, lb/in.3 | 0.097 | |||
| C, Btu/(lb)(°F) | 0.23 (at 212°F) | |||
| K, Btu/[(hr)(ft2)(°F)/ft] | 88 (at 77°F) | |||
| α, 10-6 in./in./°F | 11.0 (68 to 212°F) | |||
- a The attainable strength class number is dependent on the casting configuration, complexity, and size (both weight and wall thickness). Favorable experience with a particular configuration may allow some foundries to produce a higher strength class number than others. In case of doubt regarding the strength class number, the designer should consult or negotiate with the foundry to determine the proper strength class number to assign for a specific casting.
- b For any casting process; i.e., special mold, permanent mold, or sand mold (including chilling).
- c The mechanical properties shown are reliably obtainable in castings of this alloy and heat-treat condition when produced under the quality assurance provisions of AMS-A-21180. These provisions require preproduction approval, documentation of foundry procedures, and specific destructive and nondestructive testing procedures for the acceptance of each production lot of castings. Strict adherence to these requirements is mandatory if these properties are to be reliably assured in each casting.
- d Bearing values are “dry pin” values per Section 1.4.7.1.