C355.0 (5Si-1.3Cu-0.5Mg) Aluminum Alloy
- AMS. 4210, 4212, 4214, 4280, 4281
- Former ASTM. 355.0, SC51A; C355.0, SC51B
- SAE. 322
- UNS number. A03550, A33550
- Government. QQ-A-601, QQ-A-596, MIL-C-21180
- Foreign. ISO: CSA SC51, AC 4D, 3600, A-S4UG, EN AC-45300, Al-Si5Cu1Mg, LM 16
- Description: C355 is commonly heat treated. We typically always use C355.2 aluminum alloy. Aluminum sand casting alloy 355 uses copper to greatly improve its strength over the more common aluminum casting alloy A356. The 355 aluminum alloy is great for pressure tight applications and the alloy also maintains its strength at higher temperatures than A356. The trade off is typically C355.2 is more expensive than 355.1. Consequence of exceeding impurity limits. High iron decreases ductility. Nickel decreases resistance to corrosion. Tin reduces mechanical properties.
Typical Properties & Characteristics of Aluminum Sand Castings
| Typical Aluminum Alloys (a) | ... | Resistance to Corrosion (b) | ... | ... | ... | Typical Mechanical Properties | ||||||||||
| AA | Former AA Designation | ASTM Spec. No. | Federal Spec. No. | SAE Alloy No. | Approx. Weight, lb./in.3 | General | Stress Corrosion Cracking | Relative Machinability (c) | Castability (k) | Weldability (Arc) (d) | Ultimate Tensile Strength, ksi (i) | Yield Strength Tension, ksi (e) (i) | Elongation, Percentage in 2 in. (Round Specimen, 1/2" Dia.) (f) (i) | Shear Strength, ksi (g) | Fatigue Endurance Limit, ksi (h) | Brinell Hardness (500-kg Load, 10-mm Ball) (j) |
| 355.0-T6 | 355 | B26 | ... | 322 | 0.098 | 3 | A | 3 | 1 | 2 | 35 | 25 | 3 | 28 | 9 | 80 |
| 355.0-T7 | 355 | B26 | QQ-A-601 | ... | 0.098 | 3 | A | 3 | 1 | 2 | 38 | 36 | 0.5 | 38 | 10 | 85 |
| C355.0-T6 | C355 | B26 | ... | ... | 0.098 | 3 | A | 3 | 1 | 2 | 38 | 28 | 5 | 28 | 10 | 90 |
| Designations and nominal compositions of common aluminum alloys used for sand casting | |||||||
|---|---|---|---|---|---|---|---|
| AA Number | Former AA designations | Former ASTM number | Cu | Mg | Mn | Si | Others |
| C355.0 | C355 | SG51B | 1.20 | 0.50 | 0.10 (Max) | 5.00 | 0.60 Fe (Max), 0.35 Zn (Max) |
| Characteristics of common aluminum alloys used in sand casting | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Alloy | Fluidity | Resistance to hot cracking | Pressure tightness | Heat Treatment | Strength at elevated temperatures | General corrosion resistance | Machining | Polishing | Anodizing Appearance | Weldability |
| C355.0 | 1 | 1 | 1 | Yes | 2 | 3 | 3 | 3 | 4 | 1 |
| Alloy | Uses |
|---|---|
| C355.0 | Air-compressor fittings, crankcase, gear housings, hydraulic fittings |
| Typical Tensile Properties for separately cast test bars of comon aluminum casting alloys | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Alloy | Temper | Tensile strength | Yield strength | Shear strength | Compressive yield strength | Elongation % | ||||
| Mpa | ksi | Mpa | ksi | Mpa | ksi | Mpa | ksi | |||
| 355.0 | T6 | 240 | 35 | 175 | 25 | 195 | 28 | 180 | 26 | 3 |
| 355.0 | T7 | 265 | 38 | 250 | 36 | 195 | 28 | 260 | 38 | 0.5 |
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