ThePipingMart Blog Grades AMS 4021 Aluminum Alloy – Composition, Properties and Uses

AMS 4021 Aluminum Alloy – Composition, Properties and Uses

AMS 4021

AMS4021 is an aluminium alloy that has gained recognition for its outstanding properties, which make it a perfect choice for aerospace and structural applications. Understanding the composition, physical and mechanical properties, use, and heat treatment of AMS 4021. This blog will guide you through everything you need about AMS 4021.

What is AMS 4021?

AMS 4021 (also known as 6061 Aluminum Alloy) is a specification set by the Society of Automotive Engineers (SAE) for aluminium alloy sheets used in aircraft and aerospace applications. This specification details the requirements for the chemical composition, mechanical properties, and other critical characteristics of the aluminium alloy sheets. The AMS4021 standard is crucial for ensuring that the aluminium sheets used in aircraft manufacturing meet strict quality standards and can withstand the extreme conditions of the aerospace environment. The aerospace industry is constantly innovating and pushing boundaries, so the demand for high-quality aluminium alloys that meet AMS4021 specifications continues to be strong.

What Form is AMS 4021 Available at Pipingmart?

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

AMS 4021 Composition

AMS4021 is a magnesium alloyed aluminium incorporating trace elements such as copper, manganese, chromium, and zinc. The chemical composition of AMS 4021 ensures that it maintains its exceptional properties, including high strength, excellent toughness, and impressive resistance to stress-corrosion cracking.

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

AMS 4021 Physical Properties

AMS 4021 has a high density of 2.78g/cm3, with a melting point of 576℃. Its thermal conductivity is 98w/mk, and its thermal expansion is 22.7µm/m℃. AMS 4021’s high-quality corrosion resistance is attributed to its high magnesium content.

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

AMS 4021 Mechanical Properties

AMS 4021 is known for its incredible mechanical performance, which includes a yield strength of 300 MPa, tensile strength of 420 MPa, and elongation of up to 10%. It can withstand high-stress conditions without losing its form or structural integrity, making it suitable for applications that require strength and durability.

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 4021 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 4021 Uses

One of the primary uses of AMS 4021 is in aerospace engineering, which is used to design high-quality aircraft parts such as wings, landing gear, and fuselage frameworks. It also finds use in manufacturing military vehicles due to its high strength, lightweight, and durability properties. Additionally, AMS 4021 can be used in automotive and industrial applications requiring high-performance materials.

AMS 4021 Hardness

AMS 4021 is known for its exceptional hardness, attributed to its composition, heat treatment, and alloying elements. It can be heat-treated to achieve a hardness level of up to 115 HB, guaranteeing excellent wear and abrasion resistance.

AMS 4021 Heat Treatment

The heat treatment of AMS 4021 is crucial in enhancing its mechanical and physical properties. The material can be solution treated and aged, which results in improved strength and hardness properties. The duration and temperature of ageing can be controlled to optimize the material’s properties for specialized applications.


AMS 4021 material is an exceptional magnesium alloyed aluminium that has found use in several applications, notably in the aerospace and automotive industries. It’s chemical composition, physical and mechanical properties, uses, and heat treatment contribute to its high performance and durability. Understanding the properties and potential of AMS 4021 can help you make informed decisions when choosing materials for specialized applications.

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