ThePipingMart Blog Grades AMS 5650 Stainless Steel- Composition, Properties, and Uses

AMS 5650 Stainless Steel- Composition, Properties, and Uses

AMS 5650

AMS 5650 is a commonly used material in aerospace and petrochemical applications. Its unique properties make it highly sought after in a multitude of industries. This blog post will deeply dive into AMS 5650 material’s composition, physical and mechanical properties, common uses, and the heat treatment required for optimal performance.

What is AMS 5650?

AMS 5650 (also known as 309 Stainless Steel) is a type of stainless steel known for its high strength and corrosion resistance. This steel is often used in aerospace, defence, and oil and gas industries, where reliability and durability are key. Unlike other types of steel, AMS 5650 has a unique chemical composition that gives it these impressive properties. So, whether you’re designing an aircraft engine or a deep-sea oil rig, AMS5650 might be the perfect material for your project.

What Form Is AMS 5574 Available at Piping Mart?

  • Nuts
  • Bolts
  • Tubing
  • Channels
  • Fasteners
  • Electrodes
  • Pipe Fittings

AMS 5650 Composition

AMS 5650 is precipitation-hardening stainless steel comprising 15% chromium, 4.5% nickel, and 3% copper. Adding copper to the alloy enhances its strength and corrosion resistance, making it ideal for applications that require superior resistance to atmospheric corrosion. This material has a low carbon content, providing excellent weldability, making it easy to work with.

Element Content (%)
Iron, Fe 60
Chromium, Cr 23
Nickel, Ni 14
Manganese, Mn 2
Silicon, Si 1
Carbon, C 0.20
Phosphorous, P 0.045
Sulfur, S 0.030

AMS 5650 Physical Properties

AMS 5650 has a density of 0.278 lb/in³, a melting point of 2425-2630°F, and a thermal conductivity of 9.4 BTU/hr/ft²/°F. This material exhibits good toughness and high strength even at high temperatures. It also has excellent resistance to hydrogen embrittlement, making it suitable for applications where hydrogen is present.

Properties Metric Imperial
Density 8 g/cm3 0.289 lb/in³
Melting point 1455°C 2650°F

AMS 5650 Mechanical Properties

AMS 5650 has a typical hardness of 27 HRC, which can be increased through heat treatment. The yield strength of AMS5650 is 150 ksi, while its ultimate tensile strength is 180 ksi. It has a high modulus elasticity of 29 Msi, which makes it ideal for applications that require high strength and stiffness.

Properties Metric Imperial
Tensile strength 620 MPa 89900 psi
Yield strength (@ strain 0.200%) 310 MPa 45000 psi
Izod impact 120 – 165 J 88.5 – 122 ft-lb
Shear modulus (typical for steel) 77 GPa 11200 ksi
Elastic modulus 200 GPa 29008 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 45% 45%
Hardness, Brinell 147 147
Hardness, Rockwell B 85 85
Hardness, Vickers (converted from Rockwell B hardness) 169 169

AMS 5650 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F) 14.9 µm/m°C 8.28 µin/in°F
Thermal conductivity (@ 0-100°C/32-212°F) 15.6 W/mK 108 BTU in/hr.ft².°F

AMS 5574 Equivalent

ASTM A473 ASME SA403 ASTM A409 MIL-S-862
ASTM A479 ASME SA409 ASTM A511 SAE J405 (30309)
DIN 1.4828 ASTM A312 ASTM A554 SAE 30309

AMS 5650 Uses

AMS 5650 plate is commonly used in aerospace applications such as aircraft engine components, landing gear, and structural parts. It is also used in petrochemical applications for valves, fittings, and instrumentation. This material is highly resistant to atmospheric corrosion, making it ideal for use in marine environments. It is also used in the food and beverage industry because it can withstand acidic and alkaline environments.

AMS 5650 Hardness

The typical hardness of AMS 5650 is 27 HRC. However, the hardness can be increased through heat treatment. Heat treatment involves heating the material to a temperature of 955-1010°C for 1-4 hours, followed by rapid cooling. This process increases the material’s strength and hardness, making it suitable for high-stress applications.

AMS 5650 Heat Treatment

The heat treatment required for AMS 5650 plate involves a solution treatment process followed by an ageing process. The solution treatment process involves heating the material to 955-1010°C for 1-4 hours, followed by rapid cooling. The ageing process involves reheating the material to 510-620°C for 4-16 hours, followed by air cooling. This heat treatment process enhances the material’s strength, hardness, and resistance to corrosion.


AMS5650 is a highly versatile material commonly used in the aerospace and petrochemical industries. Its composition, physical and mechanical properties, and resistance to atmospheric corrosion make it ideal for various applications. The heat treatment required for AMS 5650 material is critical to optimizing its performance, particularly its strength and hardness. Understanding the properties and applications of AMS 5650 is essential to leveraging its full potential in various industries.

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