ThePipingMart Blog Grades AMS 4008 Aluminum Alloy – Composition, Properties and Uses

AMS 4008 Aluminum Alloy – Composition, Properties and Uses

AMS 4008

AMS4008 is a special type of alloy steel used in applications requiring high strength and corrosion resistance. AMS 4008, or Type 4340, is designed to perform well under high-stress conditions in aerospace, military, and industrial applications. This blog post will discuss the composition, physical and mechanical properties, uses, hardness, and heat treatment of AMS4008.

What is AMS 4008?

At first, AMS4008 may seem complex, but it’s pretty simple. In short, AMS 4008 (also known as 3003 Aluminum Alloy) is a standard that specifies the requirements for a digital communication protocol used in various applications. This protocol is commonly used in aerospace, allowing communication between different systems and devices. By adhering to the AMS4008 standard, companies can ensure that their systems are compatible with others and can work together seamlessly. Whether you’re an engineer, a technician, or just someone interested in aerospace technology, understanding AMS4008 is crucial for success in the industry.

What Form Is AMS 4008 Available at Piping Mart?

  • Pipes
  • Tubing

AMS 4008 Composition

AMS4008 consists of carbon, chromium, molybdenum, nickel, and vanadium. It comprises 0.38-0.43% carbon, 0.60-0.80% manganese, 0.70-0.90% chromium, 0.20-0.30% molybdenum, 1.65-2.00% nickel, and 0.03% max phosphorus and sulfur.

Element Content (%)
Aluminum, Al 98.6
Manganese, Mn 1.2
Copper, Cu 0.12

AMS 4008 Physical Properties

The physical properties of AMS 4008 include a density of 7.85 g/cm³, a specific heat of 0.46 J/g-K, and a coefficient of thermal expansion of 11.7 µm/m°C. The thermal conductivity of AMS 4008 is 43.8 W/m-K, its electrical conductivity is 3.5-5.5% IACS, and its magnetic permeability is 100-300.

Properties Metric Imperial
Density 2.73 g/cm3 0.0939 lb/in3
Melting point 644°C 1190°F

AMS 4008 Mechanical Properties

The mechanical properties of AMS 4008 include high strength, toughness, and flexibility. The tensile strength of AMS 4008 is 160 ksi, and its yield strength is 140 ksi. The elongation at break of AMS 4008 is 15%, and its area reduction is 40%. The fatigue strength of AMS 4008 is also impressive, with a fatigue endurance limit of 45 ksi.

Properties Metric Imperial
Tensile strength 130 MPa 18855 psi
Yield strength 125 MPa 18130 psi
Shear strength 83 MPa 12039 psi
Fatigue strength 55 MPa 7977 psi
Elastic modulus 70-80 GPa 10153-11603 ksi
Poisson’s ratio 0.33 0.33
Elongation 10% 10%
Hardness 35 35

AMS 4008 Equivalents

ASME SFA5.3 (E3003) ASTM B234 ASTM B345 AWS A5.3 (E3003) QQ A-200/1
ASTM B209 ASTM B241 ASTM B404 MIL A-52174 QQ A-225/2
ASTM B210 ASTM B247 ASTM B483 MIL E-15597 (MIL-3003) QQ A-250/2
ASTM B211 ASTM B313 ASTM B491 MIL P-25995 QQ A-430
ASTM B221 ASTM B316 ASTM B547 MIL S-12875 QQ WW-T-700/2
SAE J454

AMS 4008 Uses

AMS 4008 is used in various applications, including aircraft landing gear, power transmission gears, crankshafts, and connecting rods. It is also used in applications where high corrosion resistance is required, such as in marine environments.

AMS 4008 Hardness

The hardness of AMS 4008 may vary depending on its heat treatment. The typical hardness of AMS 4008 in the annealed condition is 217 HB, while it can reach a maximum hardness of 50 HRC when heat-treated.

AMS 4008 Heat Treatment

The heat treatment of AMS 4008 involves a process of hardening and tempering. Hardening is done by heating the steel to 815-845°C, then quenching it in oil or water. After hardening, the steel is tempered at a temperature of 540-660°C to relieve any internal stresses and to reduce the brittleness that can occur due to the hardening process.


AMS 4008 material is a highly versatile alloy steel with a unique combination of mechanical and physical properties, making it an excellent choice for critical aerospace, military, and industrial applications. The composition of AMS 4008, along with its physical and mechanical properties, makes it an ideal choice for use in conditions where high strength, toughness, and corrosion resistance are required. With proper heat treatment, AMS 4008 can also exhibit impressive hardness, further expanding its range of potential uses. Overall, AMS 4008 is a crucial steel alloy that significantly impacts modern-day technological progress.

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