ThePipingMart Blog Grades AMS 4128 Aluminum Alloy – Composition, Properties and Uses.

AMS 4128 Aluminum Alloy – Composition, Properties and Uses.

AMS 4128

Are you familiar with AMS 4128? It is a famous aluminium alloy often used in aerospace and defence applications. This alloy is known for its strength, toughness, and corrosion resistance. In this blog, we’ll cover everything you need to know about AMS 4128 – from its composition to its uses.

What is AMS 4128?

AMS 4128 (also known as 6061 Aluminum Alloy) is an aluminium alloy highly sought after in various industries. Known for its exceptional strength, durability and corrosion resistance, AMS4128 offers a reliable solution for multiple applications. This alloy is primarily used in the aerospace and defence industries, where its superior properties are essential for creating parts that can withstand extreme temperatures and environments. However, the benefits of AMS4128 extend beyond these fields, making it an ideal option for use in the marine and automotive industries. With its impressive combination of strength and versatility, AMS 4128 is an alloy that is certain to continue to be in high demand for years to come.

What form is AMS 4128 Available at Piping Mart?

  • Pipes
  • Tubing
  • Sheet Plates
  • Pipe Fittings
  • Forged Fittings

AMS 4128 Composition:

AMS 4128 is a high-strength aluminium alloy comprising aluminium, copper, magnesium, manganese, and silicon. The copper content gives it excellent strength, while the magnesium and silicon help to improve its hardness and resistance to corrosion. This alloy also contains small amounts of iron, zinc, and titanium.

Element Content (%)
Aluminium / Aluminum, Al 97.9
Magnesium, Mg 1
Silicon, Si 0.60
Copper, Cu 0.28
Chromium, Cr 0.20

AMS 4128 Physical Properties

AMS 4128 has a density of 2.72 g/cm3 and a melting point of 548°C. It has a thermal conductivity of 134 W/mK and an electrical conductivity of 26% IACS. This alloy also has a low thermal expansion coefficient, making it ideal for use in applications where dimensional stability is essential.

Properties Metric Imperial
Density 2.7 g/cm3 0.0975 lb/in3
Melting point 588°C 1090°F

AMS 4128 Mechanical Properties

One of the main advantages of AMS 4128 is its excellent mechanical properties. In the T6 temper, it has a tensile strength of 550 MPa and a yield strength of 465 MPa. It also has good fatigue strength and fracture toughness. Additionally, this alloy has good machinability and can be easily formed and welded.

Properties Metric Imperial
Tensile strength 310 MPa 45000 psi
Yield strength 276 MPa 40000 psi
Shear strength 207 MPa 30000 psi
Fatigue strength 96.5 MPa 14000 psi
Elastic modulus 68.9 GPa 10000 ksi
Poisson’s ratio 0.33 0.33
Elongation 12-17% 12-17%
Hardness, Brinell 95 95

AMS 4128 Equivalents

AMS 4117 ASTM B247 ASTM B429 DIN 3.3211 MIL G-18014 QQ A-200/8
ASTM B209 ASTM B307 ASTM B483 MIL A-12545 MIL G-18015 QQ A-225/8
ASTM B210 ASTM B313 ASTM B547 MIL A-22771 MIL P-25995 QQ A-250/11
ASTM B211 ASTM B316 ASTM B548 MIL F-17132A MIL T-7081 QQ A-367
ASTM B221 ASTM B345 ASTM B632 MIL F-18280 MIL W-23351 QQ A-430
ASTM B234 ASTM B361 ASTM F467 MIL F-39000 MIL W-85 QQ WW-T-700/6
ASTM B241 ASTM B404 ASTM F468 MIL F-3922 QQ A-200/16 SAE J454

AMS 4128 Uses

AMS 4128 is commonly used in the aerospace industry for structural components such as wing spars, fuselage frames, and landing gear. It is also used in the defence industry for armour plating, missile components, and other high-stress applications. This alloy is ideal for applications that require strength and corrosion resistance.

AMS 4128 Hardness

AMS 4128 has a hardness of 115 HB in the T6 temper. This hardness level is achieved through cold working and heat treatment. The T6 temper involves heating the alloy to around 535°C and quenching it in water.

AMS 4128 Heat Treatment

AMS 4128 can be heat-treated to achieve different levels of strength and hardness. The T6 temper is achieved by heating the alloy to a temperature of around 535°C and then quenching it in water. This process results in the highest level of strength and hardness for this alloy. Other heat treatments include T4, T5, and T7, which result in varying strength and hardness levels.


In summary, AMS 4128 material is a high-strength aluminium alloy with excellent mechanical properties and corrosion resistance. Its composition includes aluminium, copper, magnesium, manganese, and silicon. This alloy is commonly used in the aerospace and defence industries for high-stress applications. With its impressive strength and corrosion resistance, AMS 4128 is an excellent choice for many applications.

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