A356.0 (7Si-0.3Mg) Aluminum Alloy
- AMS. 356.0: 4217, 4260, 4261, 4284, 4285, 4286. A356.0: 4218
- Former ASTM. 356.0, SG70A; A356.0, SG70B
- SAE. 356.0: J452, 323
- UNS number. 356.0: A03560. A356.0: A13560
- Government. 356.0: QQ-A-601, QQ-A-596. A356.0: MIL-C-21180
- Foreign. ISO: AlSi7Mg, AC 4C, 3599, G-AlSi7Mg, A-S7G, EN AC-42000, LM 25
- Description: A356 is commonly heat treated. We typically always use A356.2 aluminum alloy. A356.2 (original material direct from smelter) contains improved mechanical properties. A356.2 offers more strength, ductility and elongation. Typically this alloy is used in castings for aircraft parts, pump housings, impellers, high velocity blowers and structural castings where high strength is required. It can also be used as a substitute for aluminum alloy 6061. The trade off is typically A356.2 is more expensive than 356.1. Consequence of exceeding impurity limits. High copper or nickel decreases ductility and resistance to corrosion. High iron decreases strength and ductility.
Typical A356 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) | ||||||||||
| 356.0-T6 | 356 | B26 | QQ-A-601 | 323 | 0.098 | 2 | A | 4 | 1 | 2 | 33 | 24 | 3.5 | 26 | 8.5 | 70 | ||||||||||
| 356.0-T7 | 356 | B26 | QQ-A-601 | … | 0.098 | 2 | A | 4 | 1 | 2 | 34 | 30 | 2 | 24 | 9 | 75 | ||||||||||
| A356.0-T6 | A356 | … | … | … | 0.098 | 2 | A | 4 | 1 | 2 | 37 | 27 | 5 | 20 | 8.5 | 80 | ||||||||||
| Designations & nominal compositions of common aluminum alloys used for sand casting | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AA Number | Former AA designations | Former ASTM number | Cu | Mg | Mn | Si | Others | |||||||
| A356.0 | A356 | SG70B | 0.20 (Max) | 0.35 | 0.10 (Max) | 7.00 | 0.20 Fe (Max), 0.10 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 | ||||||||||
| A356.0 | 1 | 1 | 1 | Yes | 3 | 2 | 3 | 4 | 4 | 1 | ||||||||||
| Alloy | Uses |
|---|---|
| A356.0 | Automobile transmission cases, oil pans and rear-axle housings |
| Typical Tensile Properties for separately cast test bars of common aluminum casting alloys | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy | Temper | Tensile strength | Yield strength | Shear strength | Compressive yield strength | Elongation % | ||||||||||||||
| Mpa | Ksi | Mpa | Ksi | Mpa | Ksi | Mpa | Ksi | |||||||||||||
| 356.0 | T6 | 230 | 33 | 165 | 24 | 180 | 26 | 170 | 25 | 3.5 | ||||||||||
| 356.0 | T7 | 235 | 34 | 210 | 30 | 165 | 24 | 215 | 31 | 2 | ||||||||||
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