In the material selection process for aluminum alloys, buyers often face a dilemma: choose 7075 for higher strength but suffer from poor weldability, or choose 6061 for excellent weldability but compromise on strength.
The 7005 aluminum plate exists precisely to solve this contradiction.
It is the best balance point of strength and weldability in the 7000 series. It not only possesses tensile strength far exceeding that of 6061, but also retains the excellent weldability of the 6061 level, all while being more cost-effective than 7075.
What is 7005 Aluminum Plate?
The 7005 aluminum plate belongs to the Al-Zn-Mg series wrought aluminum alloys and is a key member of the 7000 series.
This alloy uses Zinc (Zn) as its primary alloying element and Magnesium (Mg) as its secondary strengthening element. It achieves age-hardening through the precipitation of the MgZn₂phase, combining medium-to-high strength with excellent weldability.
The 7005 aluminum alloy was first put into practical application in 1960 and officially received its standard designation in 1962, accumulating over 60 years of engineering application experience.
International Standard Comparison
| Standard System | Alloy Designation |
|---|---|
| Aluminum Association (AA) | AA 7005 |
| Unified Numbering System (UNS) | UNS A97005 |
| European Standard | EN AW-7005 / AlZn4.5Mg1.5Mn |
| Chinese National Standard | GB 7005 |
| Japanese Industrial Standard | JIS 7N11 |
Specifications & Parameters of 7005 Aluminum Plate
The specification range of 7005 aluminum plates supplied by Worthwill is as follows:
| Parameter | Specification Range |
|---|---|
| Thickness | 1.0 - 600 mm |
| Width | ≤ 2650 mm (Custom ultra-wide specifications supported) |
| Length | ≤ 16000 mm (Custom ultra-long specifications supported) |
| Common Tempers | F, O, T5, T6, T651, T7451, H112 |
| Surface Treatment | Mill finish, Anodized, Coated, Brushed |
All products undergo ultrasonic testing (UT) to ensure there are no cracks, bubbles, or inclusions, and are shipped with a complete Mill Test Certificate (MTC).
Surface Treatment Options
After dispatch, 7005 aluminum plates can undergo the following post-treatments based on customer requirements:
Anodizing
7005 aluminum alloy has good anodizing reactivity and can undergo regular anodizing or hard anodizing. The anodic coating thickness is typically 5-25 μm (regular) or 25-100 μm (hard), which significantly improves surface hardness, wear resistance, and corrosion resistance.
Coating
We provide fully customizable PVDF, PE, Epoxy, and PU coating solutions tailored to meet diverse environmental, industrial, and performance requirements.
Chemical Composition of 7005 Aluminum Plate
The chemical composition of the 7005 aluminum plate strictly follows international standards. The range for each element is as follows:
| Element | Content (%) |
|---|---|
| Aluminum (Al) | Remainder (91.0-94.7%) |
| Zinc (Zn) | 4.0 - 5.0 |
| Magnesium (Mg) | 1.0 - 1.8 |
| Manganese (Mn) | 0.20 - 0.70 |
| Zirconium (Zr) | 0.08 - 0.20 |
| Chromium (Cr) | 0.06 - 0.20 |
| Titanium (Ti) | 0.01 - 0.06 |
| Iron (Fe) | ≤ 0.40 |
| Silicon (Si) | ≤ 0.35 |
| Copper (Cu) | ≤ 0.10 |
| Others (Each) | ≤ 0.05 |
| Others (Total) | ≤ 0.15 |
Simply put, the reason why 7005 aluminum plate can achieve "higher strength than 6061 and better weldability than 7075" is that it precisely captures the golden ratio of Zinc and Magnesium, supplemented by trace elements of Zirconium, Manganese, and Chromium. This perfect combination achieves an "all-around" performance of high strength, easy welding, and excellent corrosion resistance.
Physical Properties of 7005 Aluminum Plate
| Property Parameter | Value |
|---|---|
| Density | 2.78 g/cm³ |
| Elastic Modulus | 70 - 80 GPa |
| Poisson's Ratio | 0.33 |
| Thermal Conductivity | 137 - 170 W/m·K |
| Coefficient of Thermal Expansion | 23 µm/m·K |
| Specific Heat Capacity | 880 J/kg·K |
| Melting Range | 607 - 643°C |
| Solidus | 607°C |
| Liquidus | 643°C |
| Electrical Conductivity | 35 - 43% IACS |
| Calomel Potential | -850 mV |
It is particularly worth noting that 7005 has the highest ductility and the highest thermal conductivity in the 7000 series. This gives it a unique advantage in scenarios that require both thermal conductivity and structural strength (such as large heat exchangers).
Mechanical Properties of 7005 Aluminum Plate
The mechanical properties of 7005 aluminum plates vary greatly depending on different heat treatment tempers. Buyers should select the appropriate temper based on actual application needs.
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Brinell Hardness (HB) |
|---|---|---|---|---|
| O | 195 | 80 | 20 | 53 |
| T5 | 345 | 290 | 12 | — |
| T6 | 350 - 380 | 290 - 310 | 11 - 13 | 94 |
| T53 | 390 | 345 | 15 | 105 |
| T651 | — | — | — | — |
Based on your actual processing needs, 7005 aluminum plates are available in various tempers: Choose O temper for complex bending; choose T5 temper for profiles/bike frames; choose T6 temper for high-strength structures; choose T53 temper specifically for welding; and if you are doing precision CNC machining, choose T651 temper to guarantee zero deformation or warping!
Even more amazing is its "the colder it gets, the stronger it becomes" characteristic. Even in extreme cold environments of -196°C, its strength does not shrink at all; instead, it surges significantly.
Heat Treatment Process of 7005 Aluminum Plate
The heat treatment of 7005 aluminum plate is like "magic" that unlocks the material's potential. A correct set of processes can not only double the material's strength but also significantly reduce subsequent processing difficulty and costs through its unique characteristics.
- Solution Treatment: Just like making soup, it uses high temperatures to thoroughly and evenly "melt" the strengthening elements into the aluminum plate, laying a solid foundation for subsequent high strength.
- Quenching Method: Divided into air-cooling and water-cooling, this process instantly cools and locks in the high-temperature state just "brewed," preventing the well-integrated strengthened structure from being lost and softening again.
- Aging Treatment: Just like aging fine wine, it allows the internal structure to settle and stabilize, thereby fully unleashing the ultimate strength and anti-corrosion lifespan of the aluminum plate (7005 can even undergo "natural aging" at room temperature, automatically recovering its strength after welding without needing to go back into the furnace).
Welding Performance of 7005 Aluminum Plate
The 7005 aluminum plate boasts the most outstanding welding performance in the 7000 series, which is its core competitive advantage over other high-strength 7000 alloys (especially 7075).
Welding Methods
- TIG Welding (Tungsten Inert Gas): Suitable for thin plates and precision structures, offering high weld seam quality.
- MIG Welding (Metal Inert Gas): Suitable for medium-thick plates and batch production, offering high efficiency.
Recommended Welding Wires
| Wire Designation | Recommendation Level | Description |
|---|---|---|
| ER5356 | First Choice | Higher weld seam strength; post-weld strength can reach 330-370 MPa. |
| ER4043 | Alternative | Good fluidity, but slightly lower weld seam strength than ER5356. |
Welding Precautions: Before welding, thoroughly clean the oxide scale and oil stains on the board surface to prevent porosity; strictly control the welding heat input to reduce softening and deformation in the heat-affected zone; for plate thickness >8mm, preheating is required in advance.
Machining Performance of 7005 Aluminum Plate
7005 aluminum plate has excellent machining performance. Not only is the cutting smooth and non-sticky, saving tool wear, but even without the addition of cooling fluid, it can easily achieve a perfect surface finish with minimal deformation and high gloss.
Corrosion Resistance Overview of 7005 Aluminum Plate
7005 is a rare "excellent student in corrosion resistance" among the 7 series. In ordinary indoor or industrial environments, it can be used bare without any problems; when encountering high-salt environments like seaside areas, simply applying anodizing or coating will make it perfectly capable. More importantly, if you use the "dual-stage aging" process, the corrosion resistance of 7005 will directly jump to the level of conventional 6 series aluminum alloys, greatly broadening its applications in complex outdoor scenarios.
Alloy Comparison
When selecting materials, 7005 aluminum plate is often compared with 6061, 7075, and 7050 aluminum. Below is a brief comparison; for detailed analysis, please refer to our specific comparison articles.
| Comparison Dimension | 6061-T6 | 7005-T5/T6 | 7075-T6 |
|---|---|---|---|
| Tensile Strength | ~310 MPa | ~345-380 MPa | ~572 MPa |
| Yield Strength | ~276 MPa | ~290-310 MPa | ~503 MPa |
| Elongation | ~12% | ~11-13% | ~11% |
| Weldability | Excellent | Excellent | Poor |
| Corrosion Resistance | Good | Medium | Relatively Poor |
| Machinability | Excellent | Good | Good |
| Price Range | Low | Medium | High |
| Best Application | General structures, easy to form | Welded high-strength structures | Aerospace ultimate strength |
Application Areas of 7005 Aluminum Plate
Transportation (Rail/Subway)
- Application: Core material for manufacturing train carriage skeletons.
- Advantage: High strength and easy weldability. Post-weld requires no re-solution treatment, greatly simplifying the process and achieving vehicle weight reduction and energy savings.
Aerospace & Defense
- Application: Radar structural parts, aviation rescue stretchers, and other equipment.
- Advantage: Extremely high tensile strength, effectively reducing equipment dead weight and increasing aircraft payload.
Sports Equipment
- Application: Mainstream choice for bike frames and sports rackets.
- Advantage: Stronger than 6061, better weldability than 7075, strong impact resistance, making it a highly cost-effective choice.
Precision Industrial Equipment
- Application: Manufacturing large heat exchangers, fixtures, and precision molds.
- Advantage: Possesses the highest thermal conductivity among 7 series alloys; under T651 temper, internal stress is minimized, ensuring zero warpage during machining.
Medical Devices
- Application: Manufacturing wheelchair frames, prosthetic skeletons, etc.
- Advantage: Perfectly balances lightweight requirements with high strength.
3C Electronics & Consumer Goods
- Application: Electronic product casings and outdoor equipment.
- Advantage: Good surface processability with excellent anodizing results.
How to Buy 7005 Aluminum Plate
When purchasing 7005 aluminum plates, it is recommended to focus on the following aspects:
- Step 1: Clarify Temper Requirements. Determine the heat treatment temper based on your application scenario. Choose O temper for extensive forming; T5 temper for extruded structures; T651 for high-strength precision machining; and T53 for high strength required after welding.
- Step 2: Confirm Specification Parameters. Specify thickness, width, and length requirements, and confirm if custom oversize products are needed. For special thicknesses (e.g., ultra-thick plates >100mm) or ultra-wide specs, communicate with the supplier in advance regarding production lead times.
- Step 3: Request Material Certificates. Formal suppliers should be able to provide a complete Mill Test Certificate (MTC), including chemical composition test reports and mechanical property test reports, with data conforming to corresponding international standards.
- Step 4: Confirm Flaw Detection Requirements. For applications with zero tolerance for defects, such as aerospace, defense, and pressure vessels, require the supplier to provide Ultrasonic Testing (UT) reports to ensure the plate is free from internal cracks, bubbles, and inclusions.
- Step 5: Specify Surface Treatment Requirements. Determine whether anodizing, coating, or other surface treatments are needed based on the usage environment. Anodizing is recommended for marine or outdoor scenarios to enhance corrosion resistance.
Why Choose Worthwill?
Henan Worthwill Industry Co., Ltd. is a professional aluminum alloy material supplier with the following core advantages in the field of 7005 aluminum plates:
- Product Capability: Covers the full range of 7005 tempers (F, O, T5, T6, T651, T7451, H112) with thicknesses from 1.0 to 600mm, supporting customized ultra-wide and ultra-long specifications.
- Quality Assurance: 100% of products undergo ultrasonic testing. Complete MTC material certificates are provided, and third-party inspection reports (like SGS) can be provided upon request.
- Delivery Capability: Conventional specifications are kept in stock for fast dispatch; custom specifications support made-to-order production with accurate lead time commitments.
- Service Support: Our professional technical team provides material selection consulting, heat treatment process advice, and application solution support.
Frequently Asked Questions (FAQ)
- Q1: Can 7005 aluminum plates be welded?
- Yes, and 7005 has the best welding performance among the 7000 series alloys. It supports TIG and MIG welding. ER5356 welding wire is recommended, and post-weld strength can reach 330-370 MPa. Strength can be further restored using the natural aging effect or the T53 process after welding.
- Q2: Is 7005 aluminum plate suitable for bicycle frames?
- Very suitable. 7005 is currently one of the mainstream materials for mid-to-high-end bicycle frames in the industry, combining high strength and excellent weldability, offering the best cost-performance ratio in the mid-to-high-end market.
- Q3: What is the Minimum Order Quantity (MOQ) at Worthwill?
- Worthwill supports small-batch purchasing. The specific MOQ varies depending on the specifications and temper. Welcome to contact our sales team for a customized quotation based on your needs.
Conclusion
Thanks to its optimal balance of strength, weldability, machinability, and cost-effectiveness, the 7005 aluminum plate has become an essential structural material in various industries such as transportation, aerospace & defense, sports equipment, and industrial equipment.
Whether you need to weld high-strength structural parts, perform precision machining on components, or are simply looking for a strength upgrade from 6061, the 7005 aluminum plate is a choice worth prioritizing.
Henan Worthwill Industry Co., Ltd. provides a full series of 7005 aluminum plates, supports customized specifications, and ships globally.
