ALUMINUM a356.2
CATEGORY: Metal / Ingot 356.0
F- As Cast.
T6: Solution Heat Treat, Quench and Artificially Age: heat treatment such as this usually results in maximum tensile strength with adequate elongation. These properties are stabilized though aging.
MACHINABILITY: After heat treatment (notably in the T6 condition), Alloy 356.0 has good machinability. Savings can be realized by using carbide-tipped cutting tools (or better) because of the high silicon content. Rakes should be positive and high. Speeds should approach the maximum, and light cuts should be taken.
FINISHING: Alloy 356.0 has good polishing characteristics. It is excellent for electroplating and very good for chemical conversion coatings. Anodizing appearance is very good; the colour is gray.
WELDABILITY: Very good welding characteristics are shown by Alloy 356.0 for all standard welding methods. The alloy is not brazed.
CORROSION RESISTANCE: Excellent resistance to corrosion is shown. Chemical conversion coatings give further protection.
CHEMICAL COMPOSITION LIMITS
| Component | Si | Cu | Mg | Ti | Fe | Mn | Zn | Al |
|---|---|---|---|---|---|---|---|---|
| Wt % | 6.5-7.5 | Max. 0.25 | 0.2-0.45 | Max 0.25 | Max. 0.6 | Max. 0.35 | Max. 0.1 | 93 |
PHYSICAL PROPERTIES
| 356.0-F | VALUE | COMMENTS | 356.0-T6 | VALUES | COMMENTS |
|---|---|---|---|---|---|
| Density, lb/cu in. | 0.1 | - | Density, LB/cu in. | 0.1 | - |
| Hardness, Brinell | - | 500 kg load, 10 mm ball | Hardness, Brinell | 80 | 500 kg load, 10 mm ball |
MECHANICAL PROPERTIES
| 356.0-F | VALUE | COMMENTS | 356.0-T6 | VALUES | COMMENTS |
|---|---|---|---|---|---|
| Tensile Strength, Ultimate, ksi. | 26 | - | Tensile Strength, Ultimate, ksi | 38 | - |
| Tensile Strength, Yield, ksi | 18 | Set 0.2% | Tensile Strength,Yield, ksi | 27 | Set 0.2% |
| Elongation %; break | 5 | In 2 inches | Elongation%; break | 5 | In 2 inches |
| Shearing Strength, ksi | - | - | Shearing Strength, ksi | 30 | - |
| Compressive Yield Strength, ksi | - | Set 02% | Compressive Yield Strength, ksi | 27 | Set 0.2% |
THERMAL PROPERTIES
| 356.0-F | VALUE | COMMENTS | 356.0-T6 | VALUES | COMMENTS |
|---|---|---|---|---|---|
| CTE, linear 20 deg. C, um/m-deg. C | 21.4 | 20-100 deg. C | CTE, linear 20 deg. C, um/m-deg.Ci | 21.4 | 20-100 deg. C |
| CTE, linear 250 deg. C, um/m-deg. C | 23.2 | 20-300 deg. C | CTE, linear 250 deg. C, um/m-deg.Ci | 23.2 | 20-300 deg. C |
| Thermal Conductivity, W/m-K | 167 | - | Thermal Conductivity, W/Mk | 151 | - |
| Melting Point, deg. F | 1035 | Solidus | Melting Point, deg. F | 1035 | Solidus |
| Solidus, deg. F | 1035 | - | Solidus, deg. F | 1035 | - |
| Liquidus, deg. F | 1135 | - | Liquidus, deg. F | 1135 | - |
ELECTRICAL PROPERTIES
| 356.0-F | VALUE | COMMENTS | 356.0-T6 | VALUES | COMMENTS |
|---|---|---|---|---|---|
| Electrical Resistivity, Ohm-cm | 0.000004 | - | Electrical Resistivity, Ohm-cm | 0.0000044 | - |
*REFERENCES:
1. The American Foundryman's Society, Inc.; "Aluminum Casting
Technology", pp 50-77.
2. Metals Handbook Vol. 2 - Properties and Selection: Nonferrous
Alloys and Special-Purpose Materials, ASM International 10th Ed.
1990.
3. ASM Metals Reference Book, Third edition, Michael Bauccio, Ed.
ASM International, Materials Park, OH, 1993.