ThePipingMart Blog Grades AMS 6490 Steel – Composition, Properties and Uses

AMS 6490 Steel – Composition, Properties and Uses

AMS 6490

AMS 6490 is a low alloy steel widely used in various industries such as aerospace, defence, and oil and gas. This steel is produced under the specification of AMS 6490 and is known for its excellent characteristics. It has a high strength-to-weight ratio, good fatigue resistance, and remarkable toughness. This blog post will explore the chemical composition, physical and mechanical properties, heat treatment, and uses of AMS 6490.

What is AMS 6490?

AMS 6490 (also known as M50 Tool Steel) metal is a type of low alloy steel often used in aerospace and defence applications and in manufacturing power generators and heavy machinery. Its properties include high strength, great wear resistance, and excellent fracture toughness. This makes it an ideal material for components subject to high stress and harsh operating conditions. AMS 6490 is known for its remarkable toughness, which allows it to withstand extreme temperatures, pressure, and impact. It is a popular choice among engineers and manufacturers who require reliable and durable materials for their products. If you’re in the market for a metal that can withstand tough conditions, consider AMS 6490 for your next project.

AMS 6490 Composition

AMS 6490 has a chemical composition of 0.17-0.23% Carbon, 0.40-0.60% Manganese, 0.10-0.60% Silicon, 0.15-0.25% Nickel, 0.70-0.90% Chromium, and 0.40-0.60% Molybdenum. Other elements, such as Phosphorus, Sulfur, and Copper, are present in trace amounts. A combination of these elements gives AMS 6490 its excellent properties.

C Cr Si Ni V W Mn Mo S P Co Cu
min. 0.80 4.00 0.90 0.15 4.00
max. 0.85 4.25 0.25 0.15 1.10 0.25 0.35 4.50 0.008 0.015 0.25 0.10

AMS 6490 Physical Properties

The physical properties of AMS 6490 include a density of 7.85 g/cm³, a melting point of 1416-1450°C, and a thermal conductivity of 44.5 W/m.K. This alloy exhibits magnetic properties and is easy to machine and weld. Its moderate corrosion and excellent heat resistance make it a preferred choice for various applications.

Property Type Value
Density Physical 7.85 g/cm3 / 0.283 lb /in3
Young’s modulus Mechanical 210 GPa
Specific heat Thermal 460 J/kg-K
Coefficient of linear thermal expansion Thermal 11.4 10^-6/ºC
Thermal conductivity Thermal 25.0 W/(m·K)
Electric resistivity Electric 600 Ω*m*10^-9
Relative magnetic permeability Magnetic >500

AMS 6490 Mechanical Properties

AMS 6490 demonstrates high strength, excellent toughness, and good fatigue resistance. It has a tensile strength of 862 MPa and a yield strength of 758 MPa. The elongation at break is around 18%, and the hardness of the alloy varies depending on the heat treatment applied. The mechanical properties of the steel make it suitable for applications requiring strength, toughness, and durability.

Property Value (imperial) Value (metric)
Ultimate Tensile Strength 363-391 [psix10^3] 2500-2700 MPa
Hardness 60-65 HRC
Service temperature 32-797°F 0-425°C

AMS 6490 Specifications

  • UNS K88165
  • UNS T11350
  • AMS 6490
  • AMS 6491
  • ASTM A-600

AMS 6490 Uses

AMS 6490 has many applications in the aerospace, defence, and oil and gas industries. It is used in manufacturing aircraft structural parts, landing gear, and rocket engines. Its strength and toughness make it ideal for producing missile casings, engine components, and gun barrels. Oil and gas drilling equipment and hydraulic fracturing machines also utilize it.

AMS 6490 Heat Treatment

AMS 6490 can be subjected to various heat treatments, such as quenching and tempering. Quenching at 955-1010°C and tempering at 650-700°C can increase the steel’s hardness to HRC 50-55. Annealing at 770-815°C can improve its toughness and machinability. The heat treatment depends on the intended application and the desired properties of the final product.

AMS 6490 Hardness

AMS 6490 is a type of steel known for its exceptional strength and durability. One of the defining characteristics of this steel is its incredible hardness, making it a popular choice for a wide range of applications. With a rating of over 300 Brinell hardness, AMS 6490 is renowned for its ability to withstand extreme conditions and high-stress environments. This remarkable alloy will surely deliver exceptional performance and long-lasting reliability, whether used for industrial machinery, military weapons, or aerospace components. So if you’re looking for a material that can withstand the toughest challenges, look no further than AMS 6490 steel.


AMS 6490 is a low alloy steel with excellent mechanical and physical properties suitable for various applications. Its strength, fatigue, toughness, and heat resistance have made it a preferred choice in the aerospace, defence, and oil and gas industries. The heat treatment of the steel can be customized to achieve the desired properties required by the application. Understanding the chemical composition, physical and mechanical properties and heat treatment of AMS 6490 can help in choosing the right materials for various applications.

Related Post