Aluminum Series 7
Base Alloy Differences
7022-T651
- A high-strength alloy (Zn-based) with slightly better corrosion resistance than 7075.
- Used in aerospace/military applications.
7050-T7451
- High Zn content, optimized for stress corrosion resistance while retaining strength.
- Common in aircraft structures (e.g., wing spars, landing gear).
7075 (and Tempers)
- Ultra-high-strength (Zn/Mg/Cu), but poor corrosion resistance without protection.
- Widely used in aviation, molds, and high-performance sports equipment
Temper Designations Explained
| Temper | Process | Key Properties (for 7075) |
|---|---|---|
| T6 | Solution heat-treated + artificial aging | Peak strength, lower toughness/corrosion resistance. |
| T351 | Solution treated, stress-relieved (stretched), naturally aged | Balanced strength, low residual stress for machining. |
| T651 | Solution treated, stress-relieved, artificially aged | Near-T6 strength, better dimensional stability. |
| T7451 (7050 only) | Over-aged temper | Sacrifices some strength for superior stress corrosion resistance. |
Key Comparisons
- Strength: 7075-T6/T651 > 7050-T7451 > 7022-T651.
- Corrosion Resistance: 7050-T7451 > 7022-T651 > 7075-T6/T651.
- Machinability: T351/T651 (low residual stress) > T6.
Applications
- 7075-T6/T651: Aircraft frames, high-load components (requires corrosion protection).
- 7050-T7451: Marine/aerospace parts exposed to stress corrosion.
- 7022-T651: Specialty applications needing strength/corrosion balance.
Notes
- 7075 alloys typically require coatings (e.g., anodizing) for corrosion protection.
- T7451 is critical for aerospace where stress corrosion is a concern.
For exact mechanical properties (e.g., tensile strength, elongation), refer to AMS (Aerospace Material Specifications) or ASTM standards.
Aluminum Series 6
Base Alloy Differences
| Alloy | Primary Alloying Elements | Key Characteristics | Typical Applications |
|---|---|---|---|
| 6060 | Mg, Si (low) | Moderate strength, excellent extrudability, good corrosion resistance. | Architectural profiles, window frames, lightweight structures. |
| 6061 | Mg, Si (higher than 6060), Cu | High strength, good weldability, moderate corrosion resistance. | Aerospace, marine, automotive (frames, structural parts). |
| 6063 | Mg, Si (balanced) | Excellent extrudability, smooth surface finish, lower strength than 6061. | Architectural trim, LED housings, decorative parts. |
| 6082 | Mg, Si (higher than 6061), Mn | Highest strength in 6000-series, good machinability. | Heavy-duty structures, bridges, transportation. |
Temper Designations Explained
| Temper | Process | Effect on Properties |
|---|---|---|
| T6 | Solution heat-treated + artificial aging | Maximizes strength but reduces ductility. |
| T651 | Solution treated, stress-relieved (stretched), artificially aged | Similar to T6 but with reduced residual stress (better for machining). |
Note:
- 6060 is rarely seen in T6/T651 (usually supplied as T5 or T66 for extrusion).
- 6063-T6 is common for high-strength architectural applications.
- 6082-T651 is preferred for structural applications requiring strength and stability.
Key Comparisons
| Property | 6060 | 6061-T6 | 6063-T6 | 6082-T651 |
|---|---|---|---|---|
| Tensile Strength | ~160 MPa | ~310 MPa | ~240 MPa | ~340 MPa |
| Yield Strength | ~110 MPa | ~275 MPa | ~215 MPa | ~300 MPa |
| Elongation | 10–15% | 8–12% | 10–12% | 8–10% |
| Corrosion Resistance | Excellent | Good | Excellent | Good |
| Extrudability | Best | Moderate | Excellent | Moderate |
| Weldability | Good | Excellent | Good | Good |
Application Guidance
- 6060/6063: Ideal for aesthetic or lightweight applications (e.g., window frames, furniture).
- 6061-T6/T651: Best for structural parts needing strength/weldability (e.g., bike frames, aircraft fittings).
- 6082-T651: Used in high-stress applications (e.g., bridges, cranes, marine components).
Critical Notes
- 6061 vs. 6082: 6082 has higher Mn content, offering better strength but slightly lower extrudability.
- T6 vs. T651: T651 is preferred for precision parts to avoid post-machining distortion.
- Corrosion Protection: All 6000-series alloys resist corrosion well but may need anodizing for harsh environments.
For exact specs, refer to EN 573 (Europe) or ASTM B221/B210 (US) standards.
Aluminum Series 5
Base Alloy Differences
| Alloy | Primary Alloying Elements | Key Characteristics |
|---|---|---|
| 5052 | 2.5% Mg, 0.25% Cr | Excellent corrosion resistance, moderate strength, good formability. |
| 5056 | 5% Mg, 0.1% Mn | High Mg content, superior seawater resistance, used in marine applications. |
| 5083 | 4.5% Mg, 0.7% Mn | Highest strength in 5000-series, excellent weldability, marine/offshore use. |
Temper Designations Explained
| Temper | Process | Effect on Properties |
|---|---|---|
| H24 | Strain-hardened + partially annealed | Balances strength and formability. |
| H112 | Strain-hardened (minimal) | Retains basic strength, suitable for hot-formed products. |
| O | Annealed (fully softened) | Maximizes ductility for deep forming. |
Notes:
- 5052-H24: Higher strength than H112 but less ductile.
- 5083-O: Used for welding/cold working; 5083-H112 offers better strength for structural parts.
Key Mechanical Properties
| Alloy-Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 5052-H24 | 230–260 | 180–200 | 4–10 |
| 5052-H112 | 170–210 | 70–110 | 12–20 |
| 5056 | 300–350 | 150–200 | 15–25 |
| 5083-O | 270–320 | 120–160 | 20–25 |
| 5083-H112 | 270–320 | 130–170 | 10–15 |
Corrosion Resistance & Applications
| Alloy | Corrosion Resistance | Typical Applications |
|---|---|---|
| 5052 | Excellent (saltwater/chemical) | Marine hardware, fuel tanks, electronics enclosures. |
| 5056 | Superior (marine environments) | Shipbuilding, wire ropes, fasteners. |
| 5083 | Exceptional (offshore/acidic) | Ship hulls, pressure vessels, cryogenic tanks. |
Critical Notes
- Mg Content: Higher Mg (e.g., 5056, 5083) increases strength but requires thermal stability control to avoid stress corrosion.
- Formability: 5052-H112/O is better for bending; 5083-O is preferred for welding.
- Welding: 5083 is the top choice for welded marine structures due to its low crack sensitivity.
For standards, refer to ASTM B209 (plate/sheet) or EN 485 (Europe).
Aluminum Alloy 3003
Composition
- Alloy Series: 3000 series (Al-Mn alloy, manganese as the main alloying element).
- Primary Elements:
- Aluminum (Al): ≥98.6%
- Manganese (Mn): 1.0–1.5% (enhances strength)
- Copper (Cu): 0.05–0.20% (minor addition for strength)
- Iron (Fe) & Silicon (Si): Trace amounts
Key Properties
| Property | Description |
|---|---|
| Strength | Moderate (stronger than pure 1100, weaker than 5052/6061) |
| Corrosion Resistance | Excellent, especially against atmospheric and chemical exposure |
| Formability | Outstanding—ideal for deep drawing, bending, and stamping |
| Weldability | Good (TIG/MIG recommended; use 4043 filler for best results) |
| Thermal/Electrical Conductivity | Fair (lower than pure 1000-series but sufficient for heat exchangers) |
| Surface Finish | Accepts anodizing, polishing, and painting well |
Common Tempers & Mechanical Properties
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Typical Applications |
|---|---|---|---|---|
| 3003-O (Annealed) | 110–150 | 40–60 | 30–40 | Cookware, lighting fixtures (deep-drawn parts) |
| 3003-H12 (1/4 Hard) | 130–180 | 80–120 | 10–20 | General sheet metal work |
| 3003-H14 (1/2 Hard) | 150–200 | 110–150 | 5–15 | Architectural trim, heat sinks |
| 3003-H18 (Full Hard) | 200–240 | 180–220 | 1–5 | High-strength structural components |
Typical Applications
- Construction: Roofing, siding, gutters (superior weather resistance).
- Food Industry: Pots, pans, food containers (non-toxic, easy to clean).
- Chemical Equipment: Storage tanks, piping (resists acids/alkalis).
- Transportation: Fuel tanks, vehicle panels (lightweight + formable).
- Electronics: Heat sinks, conductive parts (balanced conductivity).
Comparison with Other Alloys
| Property | 3003 | 5052 | 6061 |
|---|---|---|---|
| Strength | Moderate | High | Very High |
| Corrosion Resistance | Excellent | Excellent | Good (needs protection) |
| Formability | Best | Good | Fair (requires annealing) |
| Cost | Low | Medium | High |
Critical Notes
- Non-Heat-Treatable: Strength improved only through cold working.
- Welding: Use low heat input to avoid grain growth.
- Surface Treatment: Anodizes to a light gray; suitable for coloring.
Standards:
- USA: ASTM B209, ASTM B491
- Europe: EN 573-3 (EN AW-3003)
- China: GB/T 3190
Aluminum Series 2
Base Alloy Comparison
| Alloy | Primary Composition (wt.%) | Key Characteristics |
|---|---|---|
| 2A12 (Chinese GB) | Cu 3.8-4.9%, Mg 1.2-1.8%, Mn 0.3-0.9% | High strength, heat-resistant, poor corrosion resistance (requires Alclad). |
| 2014 | Cu 4.4%, Si 0.8%, Mg 0.5% | Ultra-high strength, excellent machinability, poor weldability. |
| 2017 | Cu 4%, Mg 0.5%, Mn 0.7% | Medium-high strength, good workability (“Duralumin” legacy alloy). |
| 2024 | Cu 4.4%, Mg 1.5%, Mn 0.6% | Aerospace-grade, exceptional fatigue resistance. |
Notes:
- 2A12 is China’s equivalent to 2024, with slightly higher Mn.
- All 2000-series alloys are Cu-Al systems, offering high strength but poor corrosion resistance (require protective coatings).
Temper Designations Explained
| Temper | Process | Effect on Properties |
|---|---|---|
| T6 | Solution heat-treated + artificial aging | Peak strength, reduced ductility/corrosion resistance. |
| T351 | Solution treated, stress-relieved (stretched), naturally aged | Lower residual stress for machining. |
| T651 | Solution treated, stress-relieved, artificially aged | Near-T6 strength with improved dimensional stability. |
| T851 | Solution treated, cold worked, artificially aged | Highest strength for critical applications. |
Key Differences:
- T351 vs T651: T651 is stronger (artificial aging), while T351 is better for machining (natural aging).
- T851: Cold working further enhances strength over T6/T651.
Mechanical Properties
| Alloy-Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 2A12-T4 | 420–470 | 270–340 | 10–15 |
| 2014-T6 | 480–520 | 400–450 | 5–10 |
| 2017-T351 | 380–420 | 240–280 | 15–20 |
| 2024-T351 | 420–470 | 290–340 | 10–15 |
| 2024-T851 | 450–500 | 350–400 | 5–8 |
Strength Ranking:
2024-T851 > 2014-T6 > 2024-T351 ≈ 2A12-T4 > 2017-T351
Typical Applications
| Alloy | Primary Uses |
|---|---|
| 2A12 | Aircraft skins, rivets, military vehicles (Chinese standards). |
| 2014-T6 | Aircraft structures, high-strength fasteners, spacecraft components. |
| 2017-T351 | General structural parts, rivets, low-stress aerospace components. |
| 2024-T351/T851 | Aircraft wings/fuselages (Boeing/Airbus), missile casings. |
Critical Considerations
Corrosion Resistance:
- All 2000-series alloys require protection (Alclad or anodizing).
- Avoid unprotected use in marine/high-humidity environments.
Weldability:
- 2014/2024 are unweldable (use rivets/bolts instead).
- 2017 can be welded with 4043 filler but is prone to cracking.
Machinability:
- T351 is optimal for machining (low residual stress).
- T6/T851 require sharp tools to avoid work hardening.
Cross-Standard Equivalents
| China (GB) | USA (ASTM) | Europe (EN) |
|---|---|---|
| 2A12 | 2024 | EN AW-2024 |
| 2017 | 2017 | EN AW-2017 |
| 2014 | 2014 | EN AW-2014 |
Summary & Selection Guide
- Aerospace/Military: 2024-T851 or 2A12-T4 for maximum strength.
- Machining + Moderate Strength: 2017-T351.
- High-Temperature/Extreme Loads: 2014-T6 (but avoid welding).
For detailed specs, refer to:
- AMS 4117 (2024)
- GB/T 3191-2019 (2A12)
- ASTM B209 (2014/2017)
Aluminum Series 1
Composition & Purity Comparison
| Alloy | Aluminum Purity (%) | Primary Impurities |
|---|---|---|
| 1050 | ≥99.50% | Fe (0.40%), Si (0.25%), Cu (0.05%) |
| 1060 | ≥99.60% | Fe (0.35%), Si (0.25%), Cu (0.05%) |
| 1070 | ≥99.70% | Fe (0.25%), Si (0.20%), Cu (0.03%) |
Key Note:
- Higher purity = Better electrical/thermal conductivity but lower strength.
- 1070 is the purest (and softest), while 1050 has slightly more impurities (marginally stronger).
Mechanical Properties
| Alloy-Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 1050-O | 75–95 | 25–35 | 30–40 |
| 1050-H12 | 100–120 | 80–100 | 5–10 |
| 1060-O | 70–90 | 20–30 | 35–45 |
| 1070-O | 65–85 | 15–25 | 40–50 |
Strength Ranking: 1050 > 1060 > 1070 (due to decreasing impurity content).
Key Characteristics
| Property | 1050 | 1060 | 1070 |
|---|---|---|---|
| Electrical Conductivity (% IACS) | 61% | 62% | 63% |
| Thermal Conductivity (W/m·K) | 222 | 230 | 235 |
| Corrosion Resistance | Excellent (all grades) | ||
| Formability | Excellent (all grades, but 1070 is softest) | ||
| Weldability | Excellent (TIG/MIG compatible) |
Typical Applications
| Alloy | Primary Uses |
|---|---|
| 1050 | Chemical tanks, signage, reflectors, food packaging (foil). |
| 1060 | Power transmission lines, busbars, heat exchangers. |
| 1070 | High-purity electrolytic capacitors, specialized electronics. |
Why Choose One Over Another?
- 1050: Balance of formability and slight strength (e.g., stamped parts).
- 1060: Optimal for electrical applications (cost-effective purity).
- 1070: Ultra-high conductivity (niche uses like advanced electronics).
Temper Options
All three alloys are commonly available in:
- O (Annealed): Fully soft, maximum ductility.
- H12/H14/H18: Cold-worked states for increased strength.
Example:
- 1050-H18: Used for stiff yet lightweight reflectors.
- 1070-O: Preferred for delicate electronic components.
Critical Notes
- Not heat-treatable: Strength can only be increased via cold working.
- Surface finish: All accept anodizing well (1070 offers brightest finish).
- Avoid for structural loads: These alloys are too soft for high-stress applications.
Standards:
- ASTM B209 (Plate/Sheet)
- EN 573-1 (EN AW-1050/1060/1070)
- GB/T 3880 (China)
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