ThePipingMart Blog Grades AMS 5940 Alloy – Composition, Properties, and Uses

AMS 5940 Alloy – Composition, Properties, and Uses

AMS 5940 Alloy

AMS 5940 is a high-performance steel alloy known for its excellent mechanical and chemical properties. This alloy is widely used in the aerospace, defence, and power generation industries due to its ability to withstand high temperatures, corrosion, and wear. This guide deepens into all aspects of AMS 5940, including its composition, physical and mechanical properties, hardness, heat treatment, and more.

What is AMS 5940?

AMS 5940 is a type of stainless steel often used in highly corrosive environments. This unique alloy is known for its exceptional strength and heat and chemical damage resistance. AMS 5940 has become a go-to material from aerospace to chemical processing when demanding conditions require an even stricter solution. But what sets this steel apart from others like it? It boasts remarkable flexibility and toughness, making it ideal for use in even the harshest environments. Its high mechanical properties also ensure that it will maintain its integrity over time, even with regular exposure to corrosive elements. Overall, AMS 5940 is a remarkable material with proven, reliable and effective solutions in various applications.

AMS 5940 Composition

AMS 5940 is a low carbon, high nickel, and chromium steel alloy. The nickel and chromium elements improve the alloy’s corrosion and oxidation resistance, while the low carbon content enhances its weldability. AMS 5940 also contains molybdenum, which enhances the alloy’s strength and toughness.

AMS 5940 Physical Properties

AMS 5940 has a 7.85 g/cm3 density and a melting point of 1425-1510 °C. The alloy has a thermal conductivity of 15.9 W/mK and a specific heat capacity of 490 J/kgK. It has a coefficient of thermal expansion of 13.2 µm/mK and a modulus of elasticity of 200 GPa.

AMS 5940 Mechanical Properties

AMS 5940 has impressive mechanical properties, including a yield strength of 1100 MPa and a tensile strength of 1300 MPa. The alloy has a high elongation at a break of 15%, good impact resistance and fatigue strength. In addition, AMS 5940 can maintain its mechanical properties at elevated temperatures of up to 550 °C.

AMS 5940 Hardness

The hardness of AMS 5940 is typically measured using the Rockwell C scale, with a typical hardness range of 41-47 HRC. This alloy’s high nickel and chromium content contribute to its hardness and wear resistance.

AMS 5940 Heat Treatment

AMS 5940 is a heat-treatable alloy that can be hardened with tempering, quenching, and annealing. The alloy must be heated to 1100-1200 °C and then quenched in water or oil to achieve maximum hardness. Annealing AMS 5940 at 700-750 °C can improve its ductility and toughness.


AMS 5940 is a highly versatile, durable, and corrosion-resistant steel alloy widely used in the aerospace, defence, and power generation industries. The alloy’s low carbon content, high nickel and chromium content, and molybdenum element give it superior mechanical and physical properties, including high strength, toughness, and wear resistance. By carefully controlling the heat treatment process, AMS 5940 can be further enhanced to meet specific design needs and industrial applications. Its versatility and reliability make AMS 5940 ideal for critical and demanding applications.

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