ThePipingMart Blog Grades UNS K93601 Invar 36 – Composition, Properties, and Uses

UNS K93601 Invar 36 – Composition, Properties, and Uses

UNS K93601

UNS K93601 is a unique alloy with many advantages, making it one of the most preferred materials in various industries. You might have heard about UNS K93601 before, but do you know what it comprises, its physical and mechanical properties, and how it’s used? This blog post will discuss everything you need about UNS K93601, including its composition, properties, applications, and more.

UNS K93601 Composition

UNS K93601 is a nickel-copper alloy that contains a significant amount of nickel (up to 70%) and copper. It also comprises small amounts of manganese, silicon, and iron. This alloy has excellent anti-corrosive properties, particularly in coastal environments or areas with high levels of pollutants. It can resist stress corrosion cracking, pitting, and crevice corrosion.

Element Content (%)
Iron, Fe 60
Nickel, Ni 35-38
Others Remainder

UNS K93601 Physical Properties

UNS K93601 has unique physical properties that make it fit specific applications. It has a density of 8.94 g/cm3, which is relatively lower than most metals. Its melting point ranges between 1250-1350°C, making it ideal for high-temperature applications. On the other hand, the coefficient of thermal expansion is 13.9 x 10^-6/°C (20°C to temperature), while the thermal conductivity is approximately 31 W/m °C.

Properties Metric Imperial
Density 8.11 gm/cm3 0.293 lb/in3

UNS K93601 Mechanical Properties

UNS K93601 has fantastic mechanical properties, making it an ideal material for various industries. Its tensile strength is approximately 500 MPa, while its yield strength is 200 MPa. The alloy has a moderate hardness level with Brinell hardness values ranging between 140-200 HB. UNS K93601 also has a unique bending strength and elasticity modulus that make it transformable without losing its strength.

Properties Metric Imperial
Tensile strength 490 MPa 71 ksi
Yield strength 240 MPa 34.8 ksi
Modulus of elasticity 140 GPa 20300 ksi

  • UNS K93600
  • NILO 36
  • ASTN B388
  • B 753
  • DIN1715
  • S.E.W. 385

UNS K93601 Uses

UNS K93601 is commonly used in industries requiring materials with excellent corrosion resistance, high-temperature environments, and seawater. It’s used in marine engineering, petrochemical processing, power generation, and desalination plants. UNS K93601 is also ideal for heat exchangers, cooling towers, and condensers in various industrial processes.

UNS K93601 Hardness

UNS K93601 has a moderate hardness level, making it ideal for specific applications. Its Brinell hardness rating ranges between 140-200 HB. The hardness increases significantly during cold working or strain-hardening processes. However, annealing or similar heat treatment processes can reverse the hardness and restore the material’s original strength.

UNS K93601 Heat treatment

UNS K93601 can withstand relatively high-temperature environments, which makes it ideal for applications that require heat resistance. Annealing is the most popular heat treatment process for UNS K93601, which involves heating the material at a temperature between 700-1000°C for several hours. This process improves the material’s ductility and removes any work-hardening caused by cold working.

UNS K93601 Welding

UNS K93601 can be welded using various welding techniques, including TIG, MIG, and resistance welding. It’s important to note that the choice of welding technique will depend on the type of joint, the thickness of the material, and the application. Proper welding and heat treatment procedures ensure the final product meets the required mechanical and metallurgical properties.

UNS K93601 Corrosion Resistance

UNS K93601 has excellent resistance to corrosion in harsh environments, including seawater, acidic, and alkaline solutions. The high content of nickel and copper makes the material highly resistant to stress corrosion, cracking, pitting, and crevice corrosion. Additionally, UNS K93601 can withstand various temperatures and does not rust easily, even in high-humidity environments.


Due to its unique properties, UNSK93601 is a nickel-copper alloy widely used in various industries. It’s particularly useful in harsh environments that require materials with excellent corrosion resistance, high-temperature resistance, and seawater resistance. This alloy has a moderate hardness level, unique physical and mechanical properties, and is easy to weld. It’s essential to consider the appropriate heat treatment processes and welding techniques to ensure the final product meets the required metallurgical and mechanical properties. With UNS K93601’s numerous advantages, it’s unsurprising that it’s a popular choice across diverse industries.

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