ThePipingMart Blog Grades UNS K93603 Invar 36 – Composition, Properties and Uses

UNS K93603 Invar 36 – Composition, Properties and Uses

UNS K93603

UNS K93603 is a highly sought-after material due to its unique properties. This material has found its way into various applications, from chemical processing plants to turbine engines. This comprehensive guide will explore everything you need to know about UNS K93603, from its composition to its uses, hardness, heat treatment, welding, and corrosion resistance.

UNS K93603 Composition

UNS K93603 is a nickel-iron-chromium alloy that contains varying amounts of molybdenum, titanium, aluminium, and silicon. The composition of this alloy is specially crafted to provide exceptional resistance to corrosion and oxidation, even in high-temperature environments. This material is typically used in applications where standard stainless steel would fail.

Nickel 36%
Manganese 0.30%
Carbon 0.01%
Iron Balance

UNS K93603 Physical Properties

UNS K93603 has a density of 8.19 g/cm³ and a melting point of 1355°C. It exhibits excellent mechanical strength, ductility, low thermal expansion, and good thermal conductivity. Additionally, this material has a low thermal expansion coefficient, allowing it to withstand a wide range of temperatures without degrading.

Density 0.291 lbs/
Melting Point (Approx.) 1425°C
Electrical Resistivity @ R.T 82 Microhm·cm
Temperature Coefficient of Resistivity (20° to 100°C) 1100 PPM/°C
Thermal Expansion Coefficient (20° to 200°C) 1.05 X 10-6/°C
Thermal Conductivity @ 100°C 10.5 W/R.T.
Curie Temperature 280°C
Magnetic Attraction Yes

UNS K93603 Mechanical Properties

UNS K93603 is a high-strength material that can withstand extreme temperatures. One of its most notable characteristics is its ability to resist creep, even at temperatures exceeding 900°C. This material also exhibits high levels of flexibility and toughness, making it perfect for use in applications subjected to high stress and strain levels.

Ultimate Tensile Strength 70,000 PSI 130,000 PSI
Yield Strength (0.2% Offset) 40,000 PSI 125,000 PSI
Elongation in 2” * 35% 2%
Modulus of Elasticity (Tension) 21 X 106 PSI
Poisson’s Ratio 0.295

UNS K93603 Uses

UNS K93603 is commonly used in applications requiring corrosion and high-temperature resistance, such as chemical processing, gas turbines, and power generation. It is also used in oil and gas production, marine environments, and aerospace applications due to its exceptional strength and durability.

UNS K93603 Hardness

UNS K93603 has a typical hardness of 300 HB, which provides excellent wear resistance and durability. This material can be further hardened through heat treatment, improving its resistance to corrosion and high-temperature environments.

UNS K93603 Heat treatment

Heat treatment is a common method used to enhance the strength and durability of UNS K93603. This material can be hardened through various heat treatment methods, including annealing, quenching, and tempering. These processes can improve this material’s strength and corrosion resistance and make it suitable for operation in even the most challenging environments.

UNS K93603 Welding

UNS K93603 can be easily welded using conventional welding methods, including TIG, MIG, and plasma arc welding. However, extra care must be taken to avoid excessive heat during welding, leading to unwanted distortion and weakening of the material’s properties.

UNS K93603 Corrosion Resistance

UNS K93603 has excellent resistance to corrosion and oxidation, even in high-temperature environments. This material can withstand a wide range of chemicals, including acidic solutions, alkaline solutions, and saltwater. It exhibits exceptional resistance against pitting and crevice corrosion, making it ideal for harsh and corrosive environments.


UNS K93603 is a highly versatile material used in various industries and applications due to its unique properties. This material is prized for its exceptional resistance to corrosion and oxidation, high-temperature strength, and durability. Whether you need a material that can withstand the harshest environments or a component that requires exceptional strength and reliability, UNS K93603 is an ideal choice. This material can provide years of dependable service and performance with proper care and maintenance.

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