Incoloy vs Inconel – What’s the Difference

incoloy and inconel

Today, both Inconel and Incoloy are widely used in various applications, but many people are unaware of the fundamental differences between the two. Both Inconel and Incoloy are superalloys, also known as high-performance alloys. Still, they have distinct properties that include high corrosion and oxidation resistance and mechanical strength at high temperatures.

What is Inconel?

Inconel is a family of austenitic nickel-chromium-based superalloys. Its strength and durability at high temperatures make it an ideal material for various applications, such as aircraft engines, heat exchangers, chemical processing equipment, geothermal power plants and even nuclear reactors. In addition to its impressive strength, it has good corrosion resistance in many environments due to its nickel-chromium composition. It is often used when other materials cannot withstand the extreme temperatures or corrosive environment needed to perform certain tasks. Inconel is truly one of the most versatile alloys on the market today!

What is Incoloy?

Incoloy is a nickel-iron-chromium alloy developed by the Special Metals Corporation in 1930. It has excellent corrosion resistance and can handle temperatures up to 2000°F (1093°C). Due to its strength, high-temperature stability, and chemical resistivity, it’s used in multiple applications such as petrochemical processing, aerospace engineering of heat exchangers and turbines, components for nuclear power plants, and marine applications. Incoloy also offers superior weldability and ductility compared with other alloys making it an ideal material for many products.

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Difference Between Inconel Alloys and Incoloy Alloys

Incoloy and Inconel alloys are both Nickel-based superalloys. They have very similar properties, but the main difference is in their composition. Incoloy adds aluminium and titanium to nickel-chromium for increased corrosion resistance, while Inconel contains chromium, iron, and small amounts of molybdenum for superior oxidation resistance. Both alloys are highly corrosion-resistant at elevated temperatures, making them ideal for use in extreme environments like power generation plants or chemical processing facilities.

Properties of Inconel Alloys

  • Excellent acid resistance, including sulfuric, phosphoric, nitric, and hydrochloric.
  • Chloride-induced stress corrosion cracking is almost completely absent.
  • Excellent mechanical properties at both extremely low and extremely high temperatures
  • Excellent resistance to pitting, crevice corrosion, and intercrystalline corrosion.
  • High oxidation resistance at high temperatures.

Inconel Alloys are used in the following applications

  • Processing of chemicals and petrochemicals
  • Offshore oil platforms with flare stacks
  • Spacecraft, rocket motors/engines, and gas turbines
  • Pollution control technology
  • Nuclear power plants
  • Food processing industries
  • Heat exchangers
  • Equipment

Properties of Incoloy Alloy

  • Excellent strength resistance in high-temperature settings.
  • Excellent oxidation and carburization resistance at high temperatures.
  • Excellent creep-rupture strength
  • Aqueous corrosion resistance is excellent.
  • Fabrication simplicity

Incoloy Alloys are used in the following applications

  • Carburizing equipment, sheathing for heating elements, process piping, heat exchangers, nuclear steam generator tubing
  • Heat-treating equipment, chemical and petrochemical processing, power plants, industrial furnaces, etc.
  • Pipelines for oil and gas wells, nuclear fuel reprocessing, acid production, and pickling equipment.

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