ThePipingMart Blog Grades AMS 5717 Stainless Steel – Composition, Properties and Uses

AMS 5717 Stainless Steel – Composition, Properties and Uses

AMS 5717

As an expert in machining, you may come across various materials that go into producing complex parts. One such material is AMS 5717, a low-alloy steel commonly used in the aerospace and defence industries. But what exactly is AMS5717, and what makes it a popular choice among manufacturers? This blog post will explore the composition, physical and mechanical properties, hardness, heat treatment, and uses of AMS5717.

What is AMS 5717?

AMS 5717 (also known as Stainless Steel 333) is a specification for heat-treatable cobalt-chromium-molybdenum alloy (ASTM F90) used in medical implants and components such as prosthetics, surgical tools, and dental instruments. It offers exceptional corrosion resistance, high strength, good flexibility and biocompatibility.

AMS 5717 Composition

AMS 5717 is a low-alloy steel made of carbon, manganese, chromium, molybdenum, and vanadium. These elements are added in specific percentages to enhance the strength and durability of the alloy. The carbon content ranges from 0.05% to 0.15%, while the manganese content is typically around 0.30%. Chromium is added at 0.80%, improving its corrosion resistance. Additionally, molybdenum is added for improved strength at high temperatures, while vanadium promotes a finer grain structure and increased toughness.

Element Content (%)
Nickel, Ni 44 – 47
Chromium, Cr 24 – 27
Molybdenum, Mo 2.5 – 4
Cobalt, Co 2.5 – 4
Tungsten, W 2.5-4
Manganese, Mn 2
Silicon, Si 0.75
Carbon, C 0.08
Sulfur, S 0.03
Phosphorous, P 0.03
Iron, Fe Balance

AMS 5717 Physical Properties

AMS 5717 has a density of 7.86 g/cm³ and a melting point of 1427°C (2591°F). Its specific heat capacity is 0.502 J/g °C, and its thermal conductivity at room temperature is 37.3 W/m °C.

AMS 5717 Mechanical Properties

This low alloy steel has impressive mechanical properties, making it ideal for use in high-stress applications such as aircraft landing gear components. Its ultimate tensile strength is 1400-1600 MPa, while its yield strength is 1300 MPa. Moreover, AMS 5717 has an elongation rate of about 5-25% and its hardness ranges from 32 to 40 HRC.

Properties Metric Imperial
Tensile strength 738 MPa 107000 psi
Yield strength 324 MPa 47000 psi
Elongation at break 48% 48%

AMS 5717 Uses

AMS 5717 is popularly used in the aerospace industry to manufacture landing gear components, airframes, and engine parts. It is also utilized in the defence industry to produce military vehicles and heavy-duty machinery.

AMS 5717 Hardness

This low alloy steel has a 32-40 HRC hardness, making it an ideal material for use in high-stress applications. Its hardness value falls within the range of most hydraulic cylinders, and it can withstand significant external forces without succumbing to damage.

AMS 5717 Heat Treatment

AMS 5717 is generally heat treated to improve its mechanical properties. Heat treatment involves subjecting the material to specific temperatures and cooling rates, which alters the material’s microstructure. This process enhances the alloy’s hardness, toughness, and strength.


In conclusion, AMS 5717 is a low-alloy steel with impressive mechanical and physical properties. Its composition, combined with its hardness and heat treatment properties, makes it a popular choice among many manufacturers in the aerospace and defence industries. As an expert machinist, you can safely incorporate AMS 5717 into your manufacturing process, knowing it will deliver excellent results.

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