ThePipingMart Blog Grades AMS 5755 Hastelloy Alloy – Composition, Properties and Uses

AMS 5755 Hastelloy Alloy – Composition, Properties and Uses

AMS 5755

AMS5755 is a martensitic, high-tensile steel alloy known for its exceptional strength and resistance to wear and tear. This alloy is excellent for high-performance aerospace, defence, and automotive applications. In this article, we will explore the composition, physical and mechanical properties, uses, and heat treatment of AMS 5755.

What is AMS 5755?

AMS 5755 (also known as Hastelloy W) is a grade of steel specifically designed for high-temperature and high-stress environments. This super-alloy is composed of nickel, chromium, and molybdenum, which makes it highly resistant to corrosion and oxidation. AMS5755 is commonly used in gas turbines, jet engines, and other aerospace equipment applications. This premium quality steel is perfect for high-performance machinery that requires exceptional strength and durability.

AMS 5755 Composition

AMS 5755 is a nickel-chromium-molybdenum-columbium alloy steel with a chemical composition of 0.05% carbon, 16% chromium, 7% nickel, 0.5% molybdenum, 1.0% columbium, and the remainder being iron. This composition gives AMS 5755 some outstanding properties, such as high strength, corrosion resistance, and wear resistance.

Elements Content (%)
Nickel, Ni 63
Molybdenum, Mo 24
Iron, Fe 6
Chromium, Cr 5
Cobalt, Co  2.50
Vanadium, V  0.60

AMS 5755 Physical Properties

AMS 5755 has a density of 7.8 grams per cubic centimetre and a melting point of about 1380°C. The alloy is magnetic and has a thermal conductivity of 23.9 W/mK. These physical properties make AMS 5755 a valuable material for applications that require strength, corrosion resistance, and good thermal conductivity.

AMS 5755 Mechanical Properties

The mechanical properties of AMS 5755 depend on the heat treatment conditions. At room temperature, the alloy has a tensile strength of 2350 MPa, a yield strength of 1724 MPa, and an elongation of 7%. The alloy’s toughness is exceptional, with a Charpy V-notch impact strength of 169 J/cm2 at -40°C. These mechanical properties make AMS 5755 an ideal choice in applications where high strength, toughness, and impact resistance are essential.

AMS 5755 Equivalent

  • AMS 5755
  • AMS 5786

AMS 5755 Uses

AMS 5755 is widely used in the aerospace and defence industries for aircraft landing gear components, turbine blades, shafts, and fasteners. The alloy is also used in the oil and gas industry for drilling and extraction equipment and in the automotive industry for racing car components and high-performance engines. The alloy’s excellent mechanical properties make it an ideal material for applications that require high strength, toughness, and wear resistance.

AMS 5755 Hardness

AMS 5755 has excellent hardness properties, making it ideal for applications where wear resistance is essential. The alloy can withstand extreme wear and tear with a Rockwell hardness of 44 HRC in the annealed condition and 55 HRC in the heat treatment condition.

AMS 5755 Heat Treatment

Heat treatment is critical in shaping AMS 5755 into the desired shape and form. The alloy is heat-treated using techniques such as quench and tempering, annealing, and solution treating. These heat treatment methods help enhance the mechanical properties of the alloy, making it ideal for high-performance applications.


In conclusion, AMS 5755 material is a high-strength, corrosion-resistant, and wear-resistant alloy with various industrial applications. Its excellent physical and mechanical properties make it ideal for the aerospace, defence, and automotive industries. The alloy’s hardness and heat treatment properties enhance its suitability in high-performance applications. Knowing the composition, physical, and mechanical properties, uses, and heat treatment of AMS 5755 can significantly benefit industries looking for high-performance material options.

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AMS 5755 Hastelloy Alloy – Composition, Properties and Uses

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