3.9.2.0 Comments and Properties — 355.0 is a heat-treatable Al-Si-Mg alloy that is readily cast and has good pressure tightness. Refer to Section 3.1.3.4 for comments regarding the weldability of the alloy.
A material specification for 355.0 aluminum alloy is presented in Table 3.9.2.0(a). Room-temperature mechanical and physical properties are shown in Table 3.9.2.0(b). The effect of temperature on thermal expansion is shown in Figure 3.9.2.0.
Table 3.9.2.0(a). Material Specification for 355.0
Aluminum Alloy
| Specification | Form |
|---|---|
| AMS 4281 | Permanent mold casting |
MIL-HDBK-5J
355.0 Aluminum Alloy
| Specification | AMS 4281 |
| Form | Permanent mold casting |
| Temper | T6 |
| Location Within Casting | As specified |
| Basis | S |
| Mechanical Properties: | |
| Ftu, ksi | 27a |
| Fty, ksi | 17a |
| Fcy, ksi | 17 |
| Fsu, ksi | 17 |
| Fbrub, ksi: | |
| (e/D = 1.5) | 46 |
| (e/D = 2.0) | 58 |
| Fbryb, ksi: | |
| (e/D = 1.5) | 27 |
| (e/D = 2.0) | 32 |
| e, percent | 0.4a |
| E, 103 ksi | 10.3 |
| Ec, 103 ksi | 10.3 |
| G, 103 ksi | 3.8 |
| μ | 0.33 |
| Physical Properties: | |
| ω, lb/in.3 | 0.098 |
| 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 | See Figure 3.9.2.0 |
- b Bearing values are “dry pin” values per Section 1.4.7.1.