ThePipingMart Blog Grades Incoloy Alloy 890 (UNS N08890) – Composition, Properties and Uses

Incoloy Alloy 890 (UNS N08890) – Composition, Properties and Uses

Incoloy 890

UNS N08890 is one of the most versatile nickel-based superalloys. Its unique chemical composition, mechanical properties, physical properties, and corrosion resistance make it an ideal choice for various applications, including heat exchangers, petrochemical processing vessels, and power generation components. In this article, we’ll provide an overview of Incoloy 890, including a breakdown of its chemical composition, physical properties, and various uses and benefits.

Chemical Composition

Incoloy 890 contains a blend of iron (Fe), chromium (Cr), nickel (Ni), molybdenum (Mo), manganese (Mn), silicon (Si), aluminium (Al), titanium (Ti), copper (Cu), cobalt (Co) and carbon (C). Depending on the specific application in which Incoloy 890 is used, these elements can be present in varying amounts. For example, in some applications where high-temperature oxidation resistance is required, the composition may include more chromium or silicon than in other applications. Additionally, Incoloy 890 can contain trace elements such as sulfur (S) or phosphorus (P).

Element Content (%)
Nickel, Ni 42.5
Iron, Fe 25.605 – 28.4
Chromium, Cr 25
Silicon, Si 1.8
Molybdenum, Mo 1.5
Manganese, Mn ≤1
Titanium, Ti ≤1
Copper, Cu ≤ 0.75
Niobium, Nb 0.4
Tantalum, Ta 0.2
Carbon, C 0.1
Aluminum, Al 0.1

Mechanical Properties

Incoloy Alloy 890 has excellent mechanical properties. It has a high tensile strength at temperatures up to 2000°F (1093°C) with good ductility and formability. In addition, it exhibits good creep-rupture strength throughout its entire temperature range, making it ideal for high-pressure applications such as those found in power generation components. It also has excellent low-temperature toughness for cryogenic services, making it well-suited for cryogenic pumps and valves.

Properties Metric Imperial
Tensile strength 62 MPa 8990 psi
Yield strength 44 MPa 6380 psi
Elongation at break 46.50% 46.50%

Chemical Properties

Incoloy Alloy 890 is an alloy of nickel, iron, and chromium, with properties that make it a great choice for many industries. It’s wonderfully resistant to oxidization in high-temperature atmospheres and resists localized corrosion in chloride-containing environments. In addition, this alloy can be fabricated into different shapes, from bar to sheet, using conventional hot and cold forming methods and welding. Due to its exceptional properties, Incoloy 890 is often used in furnace components due to its excellent scaling resistance, turbine blades because of good strength at elevated temperatures, and exhaust systems because of their superior corrosion resistance.

Physical Properties

UNS N08890 is a high-performance alloy that offers superior physical properties. Its high nickel content provides excellent corrosion resistance in numerous acids, including sulfuric and phosphoric, and its resistance to chloride-ion stress-corrosion cracking. It has superior mechanical properties such as high strength, good flexibility, and toughness. Additionally, Incoloy 890 offers excellent oxidation resistance at elevated temperatures, which makes it the perfect choice for components in applications such as heat exchangers, reactors, and columns when long-term protection against environmental corrosion is required.

Properties Metric Imperial
Density 7.94 g/cm3 0.287 lb/in3
Melting point 1309-1383°C 2388-2521°F

Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient (@100°C/212°F) 14.47µm/m°C 8.039 µin/in°F

Corrosion Resistance

UNS N08890 has excellent corrosion resistance to many acids, including hydrochloric acid and sulfuric acid, as well as many other chemicals, such as seawater and brines. This makes it ideal for use in petrochemical processing vessels that must withstand harsh environments.

Heat Resistance

Incoloy 890 is an alloy specifically designed for applications demanding high-temperature resistance. The ability of This metal to withstand incredibly high temperatures makes it a great choice for use in the oil and gas industry, as well as any corrosive environment with hot temperatures. It has superior corrosion resistance compared to other alloys of similar composition, making it ideal for tough environmental conditions where heat and chemical resistance is vital. While other alloys heat up too quickly, Incoloy 890 can resist extreme temperatures while maintaining its mechanical strength. Its unique properties make this type of metal an invaluable asset in many industries that demand extreme tolerance to heat and pressure.


Incoloy 890 is a high-performance alloy with excellent durability and corrosion resistance, making it a great choice for many industrial applications. With its ability to withstand extremely high temperatures, Incoloy 890 is perfect for use in the energy and petrochemical industries. It can be used as a heat-resistant resistant element for furnaces. Additionally, it is often used for equipment components in waste incineration plants due to its anti-scaling properties. Finally, Incoloy 890’s superior strength makes it an ideal material when constructing pipelines which must endure heavy pressure.


Machining Incoloy 890 can be a challenging endeavour due to its toughness and various characteristics. This nickel-based alloy exhibits excellent resistance to oxidation and corrosion, making it a great choice for use in extreme environments. It requires careful attention to detail and the right cutting tools to achieve the desired results. The high chromium content found in Incoloy 890 makes it difficult to machine with conventional methods; however, with specialized tooling designed specifically for robust applications, this alloy can be machined successfully while maintaining its beneficial properties.


Incoloy 890 is an alloy that is well-suited for welding applications. Incoloy 890 offers excellent strength and resistance to oxidation and corrosion, making it ideal for the construction and chemical processing industries. It is also used in piping systems for high-temperature strength, making it a popular material for welding projects. Welding can be challenging when using Incoloy 890, as deformation must be prevented due to its heightened hardness. However, with proper techniques, such as high preheat temperatures and low heat inputs, it can be welded easily with minimal damage to the surrounding material. Therefore, Incoloy 890 is an excellent choice for any project where welding is needed, thanks to its durability and wide range of uses.


In summary, Incoloy 89o is a highly versatile alloy with excellent chemical composition, mechanical properties, physical properties and corrosion resistance. It is suitable for many industries, including petrochemical processing vessels, power generation components, heat exchangers, turbines, combustion chambers, cryogenic pumps & valves. These features make Incoloy 890 an ideal choice for a superalloy with exceptional performance characteristics. Whether you are looking for high-temperature oxidation resistance or low-temperature toughness, you can trust Incoloy to deliver superior results every time!

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