ThePipingMart Blog Grades AMS 4045 Aluminum Alloy – Composition, Properties, and Uses

AMS 4045 Aluminum Alloy – Composition, Properties, and Uses

AMS 4045

Regarding aerospace materials, there is no room for compromising quality and safety. That is why using high-performance materials like AMS 4045 is the norm in the industry. AMS 4045 specification is an aluminium alloy with exceptional strength and fatigue resistance, making it a popular choice for aircraft parts requiring a high strength-to-weight ratio. This blog post will closely examine what AMS 4045 is, its composition, physical and mechanical properties, uses hardness, and heat treatment processes.

What is AMS 4045?

AMS4045 (also known as Aluminum Alloy 7075) is a specification for aluminium alloys commonly used in the aerospace industry. This metal is prized for its strength, durability, and resistance to corrosion, making it an ideal material for aircraft structures and components. AMS 4045 metal is particularly in demand for applications such as aircraft skins and fuel tanks, where lightness and strength are critical. Due to its advantageous properties, this metal is found in various aircraft, from small private planes to large commercial jets. For those with a fascination for aviation and engineering, the world of AMS4045 metal is fascinating and important to explore.

What Form is AMS 4045 Available at Piping Mart?

  • Pipes
  • Tubing

AMS 4045 Composition

AMS 4045 is an aluminium alloy that contains between 4 and 5% copper, 0.7-1.2% magnesium, less than 1% Manganese, less than 1% Iron, less than 0.5% Silicon, 0.15% Chromium, and 0.15% Zinc. The presence of these elements affects the material’s properties and makes it suitable for use in the aerospace industry.










Others Total


AMS 4045












AMS 4045 Physical Properties

AMS 4045 has a density of 2.78 g/cm³ and a melting point of 520°C. It has excellent corrosion resistance, especially when coated with a protective layer. It is an excellent conductor of electricity and heat, making it ideal for heat sink applications.

Hardness, Brinell 150
Hardness, Rockwell A 53.5
Hardness, Rockwell B 87
Hardness, Vickers 175
Ultimate Tensile Strength 572 MPa 83,000 psi
Tensile Yield Strength 503 MPa 73,000 psi
Elongation at Break 11 %

AMS 4045 Mechanical Properties

The mechanical properties of AMS 4045 tubes are impressive, making it an ideal material for aerospace applications. It has a tensile strength of 68,000 psi and a yield strength of 55,000 psi. It also has excellent fatigue resistance, making it perfect for structural aircraft parts requiring a high-strength-to-weight ratio.

AMS 4045 Specifications

  • 3.4364
  • AMS4123, AMS4124, AMS QQA225/9
  • AMS4154, AMS4169, AMS QQA200/11
  • ASTM B211
  • ASTM B221
  • BS L100
  • BS L160
  • DTD 5124
  • BS EN 573, BS EN 755, BS EN 754

AMS 4045 Uses

Due to its remarkable properties, AMS 4045 finds use in various aircraft applications, from structural to non-structural parts. It is used to manufacture aircraft skins, fuselage frames, wing spars, and landing gears. It is also used to construct airframes, missiles, and rockets.

AMS 4045 Hardness

AMS 4045 pipes is exceptionally hard, making bending and shaping without cracking challenging. It undergoes annealing and other heat treatment processes to improve the material’s formability and ductility. Heat treatment processes also enhance strength, toughness, and stress-corrosion cracking resistance.

AMS 4045 Heat Treatment

The heat treatment processes applied to AMS 4045 are ageing, annealing, and solution heat treating. Ageing, or precipitation hardening, is done at 120°C to 175°C for eight to 24 hours. This process improves the material’s strength and hardness. Annealing is done at 399°C to 427°C, improving the material’s formability and ductility. Solution heat-treating is done at a temperature range of 510°C to 540°C, followed by water quenching. This process dissolves the material’s soluble particles, making it more ductile and formable.


AMS 4045 material is an essential aerospace material with remarkable strength, corrosion resistance, and fatigue resistance. Its composition, physical and mechanical properties, uses, hardness and heat treatment play significant roles in enhancing its properties, making it ideal for critical aircraft applications. Knowing more about this material’s characteristics and benefits can help companies decide what materials to use in their aerospace applications.

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