ThePipingMart Blog Grades AMS 4004 Aluminum Alloy – Composition, Properties and Uses

AMS 4004 Aluminum Alloy – Composition, Properties and Uses

AMS 4004

AMS 4004 is a specific alloy that has garnered much attention in various industries due to its exceptional properties. This aluminium alloy is composed of a blend of copper, silicon, magnesium, manganese, and zinc, providing it with unique strength and durability. It is widely used in aerospace, marine, and industrial applications due to its superior mechanical and physical properties. This blog post will discuss everything you need to know about this alloy, including its composition, physical and mechanical properties, uses, hardness, and heat treatment.

What is AMS 4004?

AMS 4004 is a code that holds great importance regarding aircraft materials. This is mainly because it stipulates the requirements for aluminium alloy sheets and plates used in aircraft construction. Learning about new technologies and advancements is always thrilling, but witnessing how these tech enhancements make a difference in our daily lives is even more fascinating. AMS 4004 is just one of those transformations that add value to our transportation sector. It ensures the safety and security of countless people who travel by air and strengthens global aircraft. Knowing how crucial AMS 4004 is, the aerospace industry has been mandated to comply with these standards worldwide. This high level of compliance makes air travel a safer experience for everyone.

AMS 4004 Composition

AMS 4004 is a heat-treatable alloy of aluminium reinforced with copper, silicon, magnesium, manganese, and zinc. The alloy composition contributes significantly to its strength and corrosion resistance. The precise composition details of this alloy show it contains 1.2% copper, 0.7% silicon, and 0.3% magnesium with a balance of aluminium. The beneficial properties of this alloy depend on these specific ingredients, making it a go-to choice for various applications.

AMS 4004 Physical Properties

AMS 4004 demonstrates excellent strength, flexibility, and corrosion resistance, which makes it an ideal candidate for aerospace and marine applications. Its density is around 2.7 g/cm³, and its melting point is approximately 582°C. Furthermore, the alloy has good electrical and thermal conductivity, which is useful in electrical and thermal applications.

AMS 4004 Mechanical Properties

AMS 4004 is well known for its high tensile strength and fracture toughness, making it a preferred choice in aerospace and structural applications. The alloy exhibits high elongation and excellent resistance to stress corrosion cracking. AMS 4004 can also retain its mechanical properties at a high temperature, making it ideal for use in high-temperature environments.

AMS 4004 Uses

AMS 4004 finds applications in various industries, including aerospace, marine, and construction. The alloy’s impressive tensile strength and corrosion resistance make it perfect for use in aircraft, where it is used in wing structures, landing gears, and engine components. Additionally, it is widely used in marine applications due to its resistance to saltwater corrosion.

AMS 4004 Hardness

AMS 4004 has excellent hardness properties, ranging from 60-70 Rockwell B hardness. This alloy’s hardness is due to its copper, silicon, and magnesium composition. It can be hardened through cold working, which increases its strength and durability.

AMS 4004 Heat Treatment

AMS 4004 can be heat-treated to improve its mechanical and physical properties. The heat treatment process can also be used to meet specific application requirements. The process involves solution annealing, quenching, and ageing. Solution annealing dissolves any residues in the alloy that may cause hardening, while quenching is done to rapidly cool the alloy from the high temperature. Finally, ageing is where the alloy is reheated at a low temperature, allowing it to regain strength and toughness.


AMS 4004 is a remarkable aluminium alloy that has gained widespread use in various industries due to its unique properties. The alloy’s composition of copper, magnesium, manganese, and zinc combined with aluminium results in its superior strength and corrosion-resistant properties. This alloy exhibits exceptional mechanical and physical properties, including high tensile strength, fracture toughness, and resistance to stress corrosion cracking. It is used in various aerospace, marine, and construction applications. It’s hardness properties and heat treatment allow the aluminium to be hardened and tailored to specific applications. Overall, AMS 4004 is a reliable and useful alloy that is ideal for many applications.

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