ThePipingMart Blog Grades AMS 5838 Hastelloy S – Composition, Properties, and Uses

AMS 5838 Hastelloy S – Composition, Properties, and Uses

AMS 5838

AMS5838 is a nickel-chromium alloy with exceptional strength, corrosion resistance, and durability. It is a premium material that has been carefully crafted to satisfy the requirements of several industries, ranging from aerospace to petrochemicals. This post will closely examine AMS5838’s composition, physical and mechanical properties, uses, and more.

What is AMS 5838?

AMS 5838 (also known as Hastelloy S) is a type of steel designed to meet the stringent requirements needed in aircraft parts and components. It is also known as ‘Aircraft Quality’ grade steel because it has superior resistivity to heat, corrosion and cracking. It offers excellent weldability, stability at high temperatures and improved machinability compared to similar steels.

AMS 5838 Composition

Firstly, let’s start with the composition of AMS 5838. This nickel-based alloy comprises 47.5% nickel, 22% chromium, 13.5% iron, 6.3% molybdenum, 2.8% titanium, and other trace elements. This combination of elements provides AMS 5838 with excellent corrosion resistance, high strength, and exceptional toughness, making it one of the most reliable alloys on the market.

Elements Content (%)
Nickel, Ni 67
Chromium, Cr 14.5 – 17
Molybdenum, Mo 14 – 16.5
Iron, Fe 3
Cobalt, Co 2
Tungsten, W 1
Copper, Cu 0.35
Manganese, Mn 0.30 – 1.0
Silicon, Si 0.20 – 0.75
Aluminum, Al 0.10 – 0.50
Carbon, C 0.020
Phosphorous, P 0.020
Boron, B 0.015
Sulfur, S 0.015
Lanthanum, La 0.010 – 0.10

AMS 5838 Physical Properties

AMS 5838 boasts impressive physical properties that make it suitable for several industries, including aerospace, power generation, and nuclear applications. The alloy has a high melting point of 1350°C (2462°F), a density of 8.19 g/cm³ (0.296 lb/in³), and a coefficient of thermal expansion of 13.5µm/m°C (7.5µin/in°F). Furthermore, AMS 5838 has excellent resistance to oxidation, hydrogen embrittlement, and stress corrosion cracking.

Properties Metric Imperial
Density 8.75 g/cm³ 0.316 lb/in³
Melting point 1360°C 2480°F

AMS 5838 Mechanical Properties

AMS 5838 has impressive mechanical properties that set it apart from other alloys. It has a tensile strength of 165 ksi (1138 MPa), a yield strength of 121 ksi (834 MPa), and an elongation of 15%. This alloy can withstand high temperatures without losing its strength and toughness, which makes it ideal for use in applications that require high stress and harsh environments.

Properties Metric Imperial
Tensile strength (@ 1093°C/1999°F, thickness 1.10-1.60 mm/0.0433-0.0630 in.) 110 MPa 16000 psi
Yield strength (@ 1093°C/1999°F, thickness 1.10-1.60 mm/0.0433-0.0630 in., 0.2% offset) 52 MPa 7540 psi
Elastic modulus 212 GPa 30700 ksi
Elongation at break (@ 982°C/1800°F, thickness 1.10-1.60 mm/0.0433-0.0630 in., in 50.8 mm) 46% 46%
Charpy Impact (V Notch; solution heat-treated, not aged) 190 J 140 ft-lb

AMS 5838 Equivalent

  • AMS 5711
  • AMS 5838
  • AMS 5873

 AMS 5838 Uses

AMS 5838 is used in different industries due to the unique properties that make it ideal for various applications. These applications include aircraft turbine engine parts, oil and gas extraction, and nuclear power generation. The alloy also manufactures fasteners, springs, and exhaust systems. AMS 5838 is favoured for its excellent strength, corrosion resistance, and durability compared to other materials.

 AMS 5838 Hardness

AMS 5838 has a hardness range of 20-30 HRC. It exhibits a combination of excellent toughness, flexibility, and mechanical strength. The hardness and strength of AMS 5838 make it ideal for use in high-stress environments such as the aerospace and petrochemical industries.

 AMS 5838 Heat treatment

AMS 5838 can be heat-treated to improve its mechanical properties. Ageing at 955-1000°C followed by air cooling can improve the tensile strength and yield strength, while solution-treated at 1125-1150°C followed by air cooling can enhance its ductility and toughness.


In summary, AMS 5838 material is a high-performance nickel-based alloy with excellent strength, toughness, and corrosion resistance. Its unique properties and versatility make it popular in different industries, including aerospace, petrochemicals, and power generation. It is crucial to understand its composition, physical and mechanical properties, uses, hardness and heat treatment to ensure it is used correctly and effectively. AMS 5838 is a remarkable alloy that plays a significant role in shaping our world’s technological advancements.

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