ThePipingMart Blog Grades AMS 5891 Haynes Alloy – Composition, Properties, and Uses

AMS 5891 Haynes Alloy – Composition, Properties, and Uses

AMS 5891

If you are in the aerospace or engineering industry, you might have encountered the term AMS5891. It is a specific type of titanium alloy known for its high strength, excellent corrosion resistance, and good weldability. In this blog post, we will explore AMS5891’s composition, physical and mechanical properties, uses, and how it can be heat-treated to improve its properties.

What is AMS 5891?

AMS5891 (also known Haynes 230 Alloy) is a titanium alloy used in aerospace and engineering applications primarily because of its high strength-to-weight ratio. It is a high-strength, alpha-beta titanium alloy originally developed by the United States Air Force (USAF) to replace aircraft components’ more expensive, heavier, and corrosion-prone metals. Today, it is widely used in the aerospace, defence, biomedical, and oil and gas industries.

What form is AMS 5891 Available at Piping Mart?

Haynes 230 Bars

AMS 5891 Composition

AMS 5891 is composed of 6% aluminium, 4% vanadium, and 0.25% iron. The remaining composition is pure titanium. The aluminium and vanadium in the alloy provide excellent strength and corrosion resistance. The iron is added to improve the weldability of the alloy.

Element Content (%)
Nickel, Ni 56.16-65.7
Chromium, Cr 20-24
Tungsten, W 13-15
Molybdenum, Mo 1-3
Manganese, Mn 1
Silicon, Si 0.25-0.75
Carbon, C 0.050-0.090

AMS 5891 Physical Properties

AMS 5891 has a density of 4.4 g/cm3, about half the steel weight. It has a melting point of 1660°C, which is higher than that of most other metals. The alloy has excellent corrosion resistance, especially in acidic or saline environments. It is also highly resistant to fatigue and creep.

Properties Metric Imperial
Density 8.96 g/cm³ 0.324 lb/in³
Melting point 1343°C 2450°F

AMS 5891 Mechanical Properties

AMS 5891 has outstanding tensile strength, the maximum stress a material can withstand without breaking. The alloy has a minimum tensile strength of 130 ksi (896 MPa) and a minimum yield strength of 120 ksi (827 MPa). It has excellent elongation, which can be bent or deformed without cracking. The alloy also has good toughness, impact strength, and fracture resistance.

Properties Metric Imperial
Tensile strength 485 MPa 70300 psi
Yield strength 275 MPa 39900 psi
Elongation at break 15.0 % 15.0 %

AMS 5891 Equivalent

Equivalent materials to HAYNES(r) 230 are:

  • AMS 5878
  • AMS 5891
  • ASTM B435
  • ASTM B564
  • ASTM B572
  • ASTM B619
  • ASTM B622
  • ASTM B626

AMS 5891 Uses

AMS 5891 is widely used in aerospace for aircraft engine components, landing gears, structural parts, and fasteners. It is also used in the biomedical industry for artificial joints and dental implants. The alloy is used in oil and gas for drilling tools and subsea equipment. In general, any application that requires high strength, good corrosion resistance, and low weight can benefit from AMS 5891.

AMS 5891 Hardness

AMS 5891 bars has an excellent hardness rating, typically reaching a Rockwell C scale of 36 – 46. The alloy can be heat-treated to improve its hardness and other properties. Heat treatment involves heating the alloy to a specific temperature, holding it at that temperature for a certain period, and then cooling it down slowly. The heat treatment process can improve the alloy’s strength, hardness, and resistance to fatigue and stress corrosion cracking.

AMS 5891 Heat treatment

Regarding AMS 5891 Heat treatment, an expert approach is crucial to achieving optimal results. With years of experience and technical know-how, professionals in this field understand the importance of carefully controlling the temperature and atmosphere during the process. By following strict guidelines and utilizing state-of-the-art equipment, they can enhance your metal parts’ mechanical and physical properties. Whether you’re in the aerospace, automotive, or medical industry, proper heat treatment can improve the strength and durability of your components. Trusting your products in the hands of experts will undoubtedly lead to a superior result.


In conclusion, due to its excellent properties, AMS 5891 material is a high-strength titanium alloy used in various industries. Understanding the material’s composition and physical and mechanical properties is critical when selecting a material for an application. Knowing how heat treatment impacts its properties allows optimal use of the material. With its high strength-to-weight ratio, corrosion resistance, good weldability, and low density, AMS 5891 is an excellent option for components subjected to high loads or fatigue stress. When you need a reliable and high-performing material, consider AMS 5891.

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