ThePipingMart Blog Grades Aluminium Alloy 2218 (UNS A92218) – Composition, Properties and Uses

Aluminium Alloy 2218 (UNS A92218) – Composition, Properties and Uses

Aluminium  2218

Al 2218 is an incredibly strong, corrosion-resistant metal with a wide range of uses. It has a high fatigue strength and excellent machinability, making it ideal for numerous projects across industries. Let’s explore the properties and benefits of this durable material.


UNS A92218 is composed of 95% aluminium and 5% copper, magnesium, and manganese. This specific combination of elements makes it highly resistant to corrosion due to its ability to form protective oxide films on its surface.

Element Content (%)
Aluminum, Al 92.50
Copper, Cu 4
Nickel, Ni 2
Magnesium, Mg 1.5

Chemical Properties

Its tensile strength is also greater than many other aluminum alloys, making it an ideal choice for applications where weight and strength are important considerations.

Mechanical Properties

This alloy offers excellent mechanical properties, including high ductility, tensile strength up to 205 MPa (29700 psi), compressive strength up to 150 MPa (21750 psi), shear strength up to 135 MPa (19600 psi), and fatigue at -150°C (-238°F).

Properties Metric Imperial
Tensile strength 345 MPa 50000 psi
Yield strength 280 MPa 40600 psi
Elongation at break 11% 11%
Poisson’s ratio 0.33 0.33
Elastic modulus 74.4 GPa 10800 ksi
Shear strength 207 MPa 30000 psi
Hardness, Brinell (@load 500 kg; thickness 10.0 mm/1100 lb;0.394 in) 105 105
Hardness, Knoop (converted from Brinell hardness value) 132 132
Hardness, Rockwell A (converted from Brinell hardness value) 43 43
Hardness, Rockwell B (converted from Brinell hardness value) 66 66
Hardness, Vickers (converted from Brinell hardness value) 118 118

Physical Properties

It also has a density of 2.72 g/cm3 (0.098 lb/in3) which makes it lightweight yet strong enough for use in structural components. For comparison, steel has a density of 7.85 g/cm3 (0.283 lb/in3).

Properties Metric Imperial
Density 2.82 g/cm³ 0.102 lb/in³
Melting point 507 – 638°C 945 – 1180°F

Thermal Properties

Properties Conditions
T (°C) Treatment
Thermal conductivity 148 W/mK 25 T61
Thermal expansion 22.3 x 10-6/°C 20-100


Aluminium alloy 2218 is used in a variety of applications such as aerospace components, automotive parts, marine equipment, electrical components, and furniture components due to its durability and resistance to corrosion caused by salt water or air pollution.

Resistance Characteristics

It is also highly heat-resistant thanks to its ability to form protective oxide films that prevent oxidation from occurring at higher temperatures. This makes it ideal for use in welding applications where temperatures can reach above 500°C (932°F). Additionally, it is easy to machine which further increases its versatility in manufacturing processes such as drilling or cutting operations.

Heat Treatment

Aluminium alloy 2218 is a great choice when looking to achieve the optimum performance in various applications. This aluminum alloy can be tailor-made through heat treatment to meet industry requirements. The tensile strength, yield strengths and hardness are particularly hardened through heat treatment, allowing better durability and resistance against corrosion. The homogenization process helps remove non-metallic particles left from the manufacturing process and further enhances desirable properties like drawability and fatigue strength. By going through heat treatment, Aluminum alloy 2218 is the perfect material for applications that need to perform in challenging environments where high temperatures or corrosive substances exist.


Aluminium 2218 machining has gained a lot of traction in recent years, thanks to its unique combination of high-strength and good machinability. This machining alloy is particularly great for lightweight components that must endure high temperatures and stress, as it offers up excellent fracture toughness. Aluminium 2218 allows for fine precision cuts and edges, making it one of the most optimal materials for machining aircraft components, automotive and marine parts, tools, fasteners and more. Additionally, its electrical conductivity is optimal for engineering applications and providing solutions where resistance is beneficial. Thanks to aluminium 2218 machining’s growing presence in this world, we are able to find inexpensive solutions with intricate detail needed in various industries or those using demanding applications.


Aluminium 2218 is one of the most popular types of aluminium used in welding projects due to its unique properties. It has excellent strength, wear resistance, and ductility and is capable of enduring high temperatures. Every weld must be carefully done to ensure quality and consistency when working with Aluminium 2218. Doing so maximises efficiency and minimises costly mistakes that can result from improper welding. It’s important to note that different methods such Aluminium TIG welding should be used in different cases as each will impact the end product differently. Knowing which method produces what kind of results can help anyone who plans to work with Aluminium 2218 to save time, money, and resources while producing quality results.


In summary, Aluminium Alloy 2218 is an incredibly versatile material with excellent mechanical and physical properties that make it suitable for a variety of applications across industries such as aerospace engineering, automotive parts manufacturing, marine equipment production, electrical component manufacturing, furniture production etc., Its high resistance to corrosion combined with its lightweight yet strong nature make it an ideal choice when designing products that require both strength and durability without sacrificing weight or performance characteristics. Finally, its ease of machining makes it well-suited for any project requiring precision fabrication operations like drilling or cutting operations without compromising quality standards or safety protocols along the way. All these qualities make Aluminium Alloy 2218 an excellent option for website owners who are looking for materials that offer maximum performance with minimal effort when producing items within their business’s scope of work!

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