This image was created with artificial intelligence – marked under Art. 50 of the AI Act, Regulation (EU) 2024/1689. It is a placeholder until the company's photos arrive.EN AW-3003 – Corrosion-resistant aluminium alloy
Everything about EN AW-3003: properties, applications and processing. Ideal for tank construction, heat exchangers and façade components.
The aluminium alloy EN AW-3003 (AlMn1Cu) belongs to the group of non-heat-treatable aluminium-manganese alloys and is one of the most important and most frequently used material grades in industry. Its popularity is based on the combination of high corrosion resistance, excellent formability, weldability and economical availability. These properties make it an indispensable material for numerous applications – from air-conditioning technology and container and apparatus engineering through to decorative surfaces in interior and exterior areas.
Compared with pure aluminium grades such as EN AW-1050 or EN AW-1200, EN AW-3003 offers significantly higher strength at almost unchanged density. This allows lighter but stable components to be realised. In sectors such as ventilation and façade construction, food technology or heat exchanger production, this alloy is particularly valued because it offers a long-lasting and low-maintenance solution. In addition, thanks to its high recyclability, it is a material with an ecological future perspective.
What is EN AW-3003?
EN AW-3003 is an aluminium-manganese-copper alloy that chemically corresponds to the AlMn1Cu type. The manganese content of around 1–1.5 % increases the strength of the metal, while the small copper content influences the dimensional stability and thermal conductivity of aluminium. The result is a material that is mechanically stable but at the same time flexible and easy to process. This makes EN AW-3003 the preferred choice for products where corrosion protection, good machinability and a homogeneous appearance are required.
The material belongs to the non-heat-treatable alloys, which means that its strength is not achieved by heat treatment (e.g. solution annealing and ageing), but by strain hardening. Depending on the rolling condition or degree of forming, it is available in different tempers – such as soft-annealed (O) or half-hard to hard (H14–H18). This flexibility in supply allows exact adaptation to technical requirements.
Thanks to its fine-grained microstructure, EN AW-3003 exhibits excellent surface quality. It is suitable for both functional and visually demanding applications. In addition, the alloy can be easily cut, milled, bent, welded and anodised, which makes it a universal material for a wide range of sectors.
Mechanical and physical characteristic values
To better classify the material properties, it is worth taking a look at the development of strength as a function of the forming condition. While in the O temper (soft-annealed) a tensile strength of around 130 MPa is achieved, it can rise to around 160 MPa in the H14 temper and even to around 200 MPa in the H18 temper. This illustrates the relationship between strain hardening and material hardness – an effect that is usually shown in technical diagrams as a rising curve.
An illustrative representation could, for example, show here how, with increasing degree of forming, not only the strength rises but also the elongation decreases. Such diagrams help in practice to select the optimum temper for a specific application (e.g. deep drawing vs. structural component).
The mechanical properties depend on the degree of forming and the thickness of the material. Typical values are:
| Property | Value range | Note |
|---|---|---|
| Density | approx. 2.73 g/cm³ | low weight with high stability |
| Tensile strength | 130–200 MPa (depending on temper) | can be increased by strain hardening |
| Elongation | 10–25 % | very good formability, ideal for deep-drawn parts |
| Thermal conductivity | approx. 160 W/m·K | good heat dissipation, ideal for heat exchangers |
| Electrical conductivity | approx. 48 % IACS | higher than for alloys with magnesium or silicon |
| Melting point | approx. 655 °C | typical value for 3000-series alloys |
The combination of low weight, high formability and moderate strength makes EN AW-3003 an ideal material for components that are exposed neither to extreme loads nor to high temperatures.
Corrosion resistance and weldability
In addition to the natural oxide layer that already reliably protects EN AW-3003, additional protective measures are often used in practice. These include anodising of aluminium, which creates a particularly hard and uniform surface, as well as paint coatings or powder coatings, which protect the material against aggressive media or mechanical stress. In industrial applications, corrosion resistance is also regularly monitored by chemical test methods, such as salt spray tests (in accordance with DIN EN ISO 9227). These tests serve to objectively assess long-term stability and surface protection and are an important part of quality control in metalworking.
Corrosion behaviour
One of the greatest advantages of EN AW-3003 is its excellent corrosion resistance. The alloy forms a stable oxide layer on the surface, which protects the material underneath from further attack. Particularly in damp or slightly aggressive environments – for example in the food industry, outdoors or in air-conditioning systems – the material remains resistant and dimensionally stable. Even after years of use, EN AW-3003 shows only minor signs of surface changes.
In alkaline media or in direct contact with strongly corrosive substances, the resistance may be limited, which is why an additional coating or anodising is recommended for special chemical exposure.
Welding and brazing
EN AW-3003 can be welded very well – both with the MIG and the TIG process, whereby the choice of filler material affects the quality of the seam and the mechanical properties. Filler wires of the EN AW-4043 (AlSi5) type have proven particularly successful, as they enable good wettability and a crack-free joint. Alternatively, EN AW-3003 itself can also be used as a welding filler if the most homogeneous possible joint is to be achieved.
When welding sheets with thin wall thicknesses, a low heat input is advisable in order to avoid excessive distortion. The material hardly tends to hot cracking, which means that even complex components with long seams can be processed reliably. It is important to clean the surface thoroughly before welding in order to remove oxide films and contamination that could otherwise impair the seam quality.
Typical applications in industry and construction
| Field of application | Typical form | Advantage |
|---|---|---|
| Heat exchangers, cooling fins | Sheet, strip | High thermal conductivity and corrosion protection |
| Container and tank construction | Sheet, coil | Good weldability and tightness |
| Façade and roof cladding | Sheet, profile | Weather-resistant, easily formable |
| Interior fitting, reflectors | Thin sheet | Smooth surface, good formability |
| Ventilation and air-conditioning systems | Sheet, strip | Low weight, high resistance to moisture |
| Household and apparatus construction | Sheet, profile | Easy to machine, cost-efficient |
EN AW-3003 is used particularly frequently in air-conditioning and refrigeration technology, as the combination of thermal conductivity and corrosion resistance is ideal. Sheets and profiles of this alloy are also used in transport and vehicle construction, for example for interior panelling or tank components.
Processing and cut to size
In practice, EN AW-3003 convinces through its excellent machinability. The material can be processed both by machining (e.g. milling, sawing, drilling) and by forming (e.g. edge bending, deep drawing, rolling). Due to its medium strength, it can be machined precisely and with low distortion. Sharp tools and a controlled feed are important here in order to achieve clean cut surfaces and avoid heat build-up.
EN AW-3003 also plays to its strengths in sheet metalworking: it can be easily formed and shows high dimensional accuracy even with complex geometries. Thanks to the uniform microstructure, smooth surfaces are produced that are excellently suited to visual applications.
For industrial cutting, CNC-controlled machines are usually used in order to achieve precise, reproducible results. In this way, both one-off productions and series productions can be implemented efficiently. The surface can subsequently be anodised, painted or coated in order to adapt it to the respective operating conditions. An anodised layer provides additional corrosion protection and a uniform appearance.
Particularly advantageous is the possibility of producing dimensionally accurate cut pieces directly to customer requirements – for example for claddings, housings, tanks or heat exchanger plates. Thanks to the good flatness and the uniform material distribution, a high fitting accuracy is achieved, which makes the material ideal for precise assemblies.
Standards, quality and delivery forms
Technical specifications
- Standard designation: EN AW-3003 / AlMn1Cu
- EN standards: EN 573 (chemical composition), EN 485 (mechanical properties), EN 515 (tempers), EN 573-3 (alloy symbols)
- Delivery forms: sheets, plates, strips, coils, profiles
- Tempers: O (soft-annealed), H12–H18 (strain-hardened)
- Surface variants: raw, ground, anodised, painted
Production is carried out in accordance with strict tolerance specifications to EN 485 in order to ensure dimensional accuracy and surface quality. Quality controls ensure that every batch complies with the specifications.
Sustainability and recyclability
Aluminium is regarded as one of the most sustainable construction materials of all – and EN AW-3003 is no exception here. This alloy is almost completely recyclable without its material properties changing noticeably. The energy required for reprocessing is only around 5 % of the energy required for primary production. This means: every recycled kilogram of aluminium saves considerable amounts of energy and CO₂ emissions.
Added to this is the exceptionally long service life of the material. Products made from EN AW-3003 rarely need to be replaced, as they remain functional for many decades thanks to their corrosion resistance. The alloy thus actively contributes to a sustainable circular economy – an important aspect for companies that rely on environmentally conscious production processes.
EN AW-3003 also convinces in disposal: the material can be melted down and reused without loss of quality, creating a closed material cycle. This makes it particularly attractive for sectors that pay attention to sustainable resource use and environmental certifications.
Decision aid: when is EN AW-3003 worthwhile?
| Alloy | Strength | Anodisability | Corrosion resistance | Formability | Price level |
|---|---|---|---|---|---|
| EN AW-1050 | low | very good | good | very high | inexpensive |
| EN AW-3003 | medium | good | very good | high | inexpensive |
| EN AW-5005 | medium | very good | very good | high | medium |
| EN AW-5754 | higher | good | very good | medium | somewhat more expensive |
This comparison table illustrates that EN AW-3003 offers the optimum middle ground between price, machinability and corrosion protection. While EN AW-1050 is ideal for simple applications and EN AW-5754 scores with higher strength, EN AW-3003 represents the economically balanced solution for many projects.
EN AW-3003 is the optimum choice when a balanced combination of corrosion protection, formability and cost-effectiveness is required. It closes the gap between the soft, pure aluminium alloys and the high-strength, more difficult-to-process materials.
Recommended for:
- Applications with moisture, steam or mild chemicals
- Visible parts with high surface quality
- Constructions with low to medium load
- Projects with a focus on sustainability and recycling
In direct comparison:
- Compared with EN AW-1050, it offers higher strength.
- Compared with EN AW-5005, it is less expensive, with somewhat lower anodisability.
- Compared with EN AW-5754, it is softer, but better suited to deep drawing.
Versatile, corrosion-resistant and economical
EN AW-3003 is one of the most versatile aluminium alloys on the market and combines technical performance, ease of processing and ecological sustainability. It offers an optimum combination of corrosion protection, formability and weldability and is therefore suitable for almost all industrial sectors – from apparatus engineering and building services through to vehicle and mechanical engineering.
In daily use, EN AW-3003 convinces through its reliability, long service life and simple processing. Its availability in various tempers and surface variants enables tailor-made solutions for a wide range of requirements. In addition, the high recycling rate is a clear plus for sustainable production processes.
Anyone looking for a material that is economical, long-lasting and technically mature will find a safe choice in EN AW-3003. It stands for a generation of aluminium alloys that combines modern efficiency with proven resistance – a material that meets the demands of both industry and the environment equally.
FAQ
What is EN AW-3003? An aluminium-manganese alloy with approx. 1–1.5 % manganese and small amounts of copper, known for its corrosion resistance, weldability and formability.
Can EN AW-3003 be anodised? Yes, the alloy can be anodised and produces uniform, matt surfaces. For particularly colour-intensive results, however, EN AW-5005 is better suited.
What is EN AW-3003 used for? It is used primarily for heat exchangers, containers, façade elements, reflectors, ventilation systems, apparatus engineering and decorative parts.
How does EN AW-3003 differ from EN AW-1050? EN AW-3003 is stronger and more resistant to corrosion, while EN AW-1050 is particularly soft and easy to form.
Is EN AW-3003 weldable? Yes, it can be welded excellently with MIG or TIG processes, preferably with AlSi5 filler material.
How sustainable is EN AW-3003? The alloy is almost 100 % recyclable and has a very low energy requirement during recycling, which means it is regarded as particularly environmentally friendly.