ThePipingMart Blog Grades Incoloy 028 Alloy – Composition, Properties and Uses

Incoloy 028 Alloy – Composition, Properties and Uses

Incoloy 028 Alloys

Incoloy 028 is a nickel-iron-chromium alloy with superior corrosion resistance and high-temperature strength. It is a superalloy and has excellent performance at extreme temperatures and in high-pressure environments. Its primary use is in the petrochemical industry, which is used in valves, fasteners, and pumps due to its superior corrosion resistance. This blog post will explore the composition, mechanical properties, physical properties, uses, corrosion resistance, heat resistance, heat treatment, machining, and welding of Incoloy 028 alloys.

Incoloy 028 Composition

Super Alloy incoloy Alloy 028 (UNS N08028) contains approximately 28% chromium and 22% nickel with trace amounts of manganese (up to 3%), silicon (up to 1%), molybdenum (up to 1%), copper (up to 1%), aluminium (up to 1%) and titanium (up to 2%). These minor elements give the alloy superior strength at high temperatures and excellent corrosion resistance.

Element Content (%)
Iron, Fe 29-40.4
Nickel, Ni 30-34
Chromium, Cr 26-28
Molybdenum, Mo 3-4
Manganese, Mn ≤2.5
Others Remainder

Incoloy 028 Mechanical Properties

Incoloy alloy 028 has an ultimate tensile strength of 830 MPa at room temperature with a yield strength of 795 MPa. It also has a good fatigue strength with an endurance limit between 240 – 310 MPa, depending on the cross-section size. The alloy also has a relatively low coefficient of thermal expansion compared to other alloys, which makes it ideal for use in high-temperature applications where dimensional stability is important.

Properties Metric Imperial
Tensile strength(annealed) 500 MPa 72.5 ksi
Yield strength(annealed) 214 MPa 31 ksi
Elongation at Break(Cold worked) 15% 50%
Modulus of Elasticity 200 GPa 29000 ksi
Hardness, Rockwell B 80-90 80-90
Hardness, Rockwell C 33 33

Incoloy 028 Physical Properties

Alloy 028 has a density of 8.3 g/cm3, making it relatively light compared to other metals such as steel or aluminium. It also has a relatively low melting point of 1430°C, making it easy to work with using conventional methods such as casting or forging. The alloy retains its strength up to temperatures as high as 1000°C, making it ideal for use in high-temperature applications such as gas turbines or power plants.

Properties Metric Imperial
Density 8 gm/cm3 0.289 lb/in3

Incoloy 028 Equivalent

  • UNS N08028
  • ASTM B 668
  • ASTM B709
  • ASTM B829

Incoloy 028 Uses

Due to its excellent corrosion resistance and good mechanical properties at elevated temperatures, 028 Incoloy can be used in many different industries, including petrochemical processing, power generation plants, oil and gas exploration equipment, chemical processing equipment and marine applications such as propellers and shafts. The alloy can also be used in nuclear reactors due to its low neutron absorption cross-section, making it resistant to neutron radiation damage.

Corrosion Resistance

Incoloy 028 is an alloy widely appreciated for its excellent corrosion resistance. This nickel-iron-based alloy is used in various chemical and marine environments, making it a popular material choice in the industrial sector. Incoloy 028 also resists high temperatures and oxidation, making it suitable for many power generation applications, such as furnace components and steam super-heater supports. With its ability to protect against general corrosion, pitting crevice corrosion and stress cracking, Incoloy 028 is considered a reliable choice when strength and durability under harsh conditions are essential.

Heat Resistance

Incoloy 028 has become a popular metal for heat-resistant components due to its nickel-iron-chromium alloy composition and strong general corrosion resistance. It has the ability to withstand long periods of time with temperatures up to 1290°F (or 700°C) without any mishandling or breakage. This makes Incoloy 028 a highly sought-after material in various industries, such as petrochemical, ocean engineering, and nuclear power plants. Beyond resisting high temperatures and offering significant overall protection, Incoloy 028 is an extremely durable and cost-effective metal that offers versatile application options.

Heat Treatment

028 Alloy is a nickel-iron-chromium alloy with high levels of corrosion resistance, making it ideal for use in hostile environments. To further enhance the properties of this material, heat treatment can be performed to change its mechanical and physical properties. This treatment will result in increased strength and hardness, better corrosion and oxidation resistance, improved ductility, and other beneficial results. It is crucial to use temperatures and specified treatments to treat Incoloy 028 and get the best possible results.


Incoloy 028 machining has become increasingly popular among manufacturers across the globe due to its high corrosion and oxidation resistance. Its ability to withstand over 1300F and stress corrosion cracking makes it an ideal option for industries where heat, pressure, and caustic atmosphere exposures are common. It is also malleable, meaning it can create parts with different shapes and textures without compromising its sturdy qualities. With the advancement of technology, more efficient techniques like waterjet cutting can be used to cut through Incoloy 028 with extreme precision. Thanks to better techniques, manufacturers can now craft highly durable components that meet their desired requirements while potentially reducing costs compared to traditional practices.


Welding Incoloy 028 provides durable and reliable joint integrity. It has low carbon content, which outlets high-temperature corrosion, making it ideal for use in the chemical, petrochemical, and maritime industries. This welding solution can also be used for fabrications and connections of equipment made of super alloys and metals like nickel, iron, and chromium. Due to its superior mechanical properties, welders need extra care when working with Incoloy 028, as its thermal conductivity requires specific handling under high-temperature conditions to guarantee maximum results. Furthermore, this welding rod provides ease of use alongside excellent flexibility as it can adhere to surfaces such as cast iron and steel.


In conclusion, Incoloy 028 is an extremely versatile material that can be used in many different industries due to its excellent mechanical properties at elevated temperatures combined with its good corrosion resistance even in highly corrosive environments such as seawater or acidic solutions. Its low melting point allows for easy fabrication while its moderate coefficient of thermal expansion ensures dimensional stability under changing temperatures making it ideal for many different applications, including petrochemical processing equipment or marine components like propellers or shafts. Understanding the composition, mechanical, and physical properties using corrosion resistance, heat resistance, and heat treatment machining welding capabilities can help you determine if Incoloy 028 is right for your application needs!

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