ThePipingMart Blog Grades AMS 5708 Waspaloy Alloy – Composition, Properties and Uses

AMS 5708 Waspaloy Alloy – Composition, Properties and Uses

AMS 5708

AMS 5708 is a widely used nickel alloy that is popularly known for its excellent resistance to high temperatures, chemical corrosion, and mechanical erosion. This versatile alloy is often used for a variety of applications that require superior strength, durability, and reliability under extreme conditions. This article will delve into everything you need to know about AMS 5708, including its composition, physical and mechanical properties, heat treatment, and usage.

What is AMS 5708?

AMS 5708 metal is a type of high-strength alloy that is engineered for use in extreme environments. Unlike traditional metals that can corrode, warp or succumb to high temperatures and pressure, AMS5708 is specifically designed to withstand all of these challenges. In fact, the material can retain its strength even when exposed to temperatures that exceed 1000°F. The unique combination of elements, including chrome, nickel and molybdenum, give AMS5708 its remarkable strength properties, making it an ideal choice for a wide range of applications where durability and reliability are critical, such as aviation, aerospace, and military equipment. Whether you’re designing a new aircraft or building a high-performance engine block, AMS5708 metal is a material that can stand up to the toughest conditions and deliver exceptional results that will stand the test of time.

AMS 5708 Composition

AMS 5708 material is a nickel-based alloy that is composed of multiple elements, including chromium, iron, cobalt, and molybdenum. It also contains trace amounts of carbon, manganese, silicon, and phosphorus. Its composition is carefully designed to provide a balance of strength, toughness, and resistance to various types of corrosion, such as pitting, crevice, and stress corrosion cracking.

Element Content (%)
Nickel, Ni 56
Chromium, Cr 19
Cobalt, Co 13.5
Molybdenum, Mo 4.30
Titanium, Ti 3
Iron, Fe ≤ 2
Aluminum, Al 1.50
Silicon, Si ≤ 0.15
Manganese, Mn ≤ 0.10
Carbon, C 0.080
Zirconium, Zr 0.050
Boron, B 0.0060

AMS 5708 Physical Properties

AMS 5708 round bar has excellent physical properties, including a density of 8.1 g/cm3 and a melting point of 1343°C. It also has a low coefficient of thermal expansion and high thermal conductivity, making it ideal for applications that require thermal stability and resistance to thermal shock. Additionally, it exhibits good electrical conductivity and magnetism, which can be useful in certain applications, such as electrical machinery and magnetic resonance imaging (MRI) devices.

Properties Metric Imperial
Density 8.20 g/cm3 0.296 lb/in3
Melting point 1358°C 2475°F

AMS 5708 Mechanical Properties

AMS 5708 sheet has outstanding mechanical properties, including a high tensile strength of up to 1900 MPa and a yield strength of up to 1700 MPa. It also has excellent ductility and toughness, which allow it to withstand high stress and deformation without breaking or cracking. Moreover, it exhibits outstanding resistance to fatigue, creep, and wear, making it ideal for applications that demand high endurance and performance, such as aerospace, automotive, and marine industries.

Properties Metric Imperial
Tensile strength 1335 MPa 193600 psi
Yield strength (@ strain 0.200%) 910 MPa 132000 psi
Modulus of elasticity (@20°C) 213 GPa 30900 ksi
Elongation at break (in 51 mm) 26.6% 26.6%

AMS 5706 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@20-500°C/68-932°F) 13.9 µm/m°C 7.72 µin/in°F
Thermal conductivity (@ 200°C/392°F) 12.6 W/mK 87.4 BTU in/hr.ft².°F

AMS 5708 Equivalent

AISI 685 UNS N07001 ASTM B637 PWA 1007 AMS 5544
AMS 5706 DIN 2.4654 PWA 1030 AMS 5586 AMS 5709
PWA 1005 PWA 686 AMS 5704 AMS 5828 PWA 1006
PWA 687 SPS M175 Waspalloy

AMS 5708 Uses

AMS 5708 bars is widely used for various applications that require high strength, corrosion resistance, and thermal stability. Some common uses include gas turbines, jet engines, heat exchangers, chemical processing equipment, oil and gas drilling tools, and nuclear power plants. Its properties make it ideal for use in harsh and aggressive environments where conventional metals would fail, such as high-temperature combustion gases, corrosive chemicals, and abrasive particles.

AMS 5708 Hardness

AMS 5708 has a typical hardness range of 32-38 HRC (Rockwell hardness test), which is relatively high compared to other nickel alloys. This hardness level allows it to resist deformation and wear under high stress and impact loads. It also enables it to maintain its shape and profile over extended periods under harsh conditions, such as friction, vibration, and machining.

AMS 5708 Heat Treatment

AMS 5708 can be heat-treated to enhance its mechanical properties and resistance to thermal and mechanical stresses. The typical heat treatment for this alloy involves annealing, solution treatment, and ageing. Annealing is done to reduce internal stress and improve ductility. Solution treatment is done to dissolve any precipitated phases and restore homogeneity. Ageing is done to promote the formation of coherent and stable precipitates that provide improved strength and toughness.


In conclusion, AMS 5708 material is a highly advanced nickel alloy that offers extraordinary properties and performance under extreme conditions. Its unique composition, physical and mechanical properties, and heat treatment capabilities make it ideal for a wide range of applications that require superior strength, durability, and resistance to corrosion and wear. By understanding the characteristics and uses of AMS 5708, engineers and designers can leverage its capabilities to create innovative and reliable products that can withstand the most demanding environments.

Related Post