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What is the Difference Between Hastelloy® and Incoloy®?

Posted by Adam Ascione on September 17, 2015

Hastelloy® and Incoloy® are both members of the “superalloy” family, also known as high-performance alloys. As such, they have several key characteristics in common. They both possess excellent mechanical strength, especially at high temperatures, and they are both highly resistant to corrosion and oxidation. However, there are also several important differences to note between these two superalloys, including their chemical composition, their weldability, and their suitability for different applications.

Hastelloy®

Hastelloy® (milled by Haynes) is a nickel-molybdenum alloy. There are many different grades of Hastelloy®, many of which are nickel-chromium-molybdenum alloys. Each of these grades has been optimized for a specific purpose, but all of them are highly resistant to corrosion. The inclusion of molybdenum makes Hastelloy® harder, stronger at high temperatures, and also makes it great for welding applications. These alloys are easily fabricated and formed. They have good ductility and can be forged and cold worked.

Hastelloy® has outstanding resistance to highly oxidizing and reducing agents, making it a great choice for moderate to severe corrosive environments. It is commonly used for pipes and valves in the chemical processing and petrochemical industries. It is also used in nuclear reactors and chemical reactors, and is excellent for pressure vessels and heat exchangers.

Incoloy®

Incoloy® (milled by Special Metals) is a nickel-iron-chromium alloy. There are also many different grades of Incoloy® available. Most of these grades were designed specifically for high temperature applications. Incoloy® is relatively easy to fabricate, and can be made using the same machines and processes used to make stainless steel. Its high iron content makes it a more cost effective solution for many applications. In general, Incoloy® is not suitable for severely corrosive environments, but some grades have been designed for increased corrosion resistance, even in harsh environments.

Incoloy’s® high temperature strength and resistance to seawater, brine, sour gas, and chloride make it ideal for use in the oil and gas industries. It is also used for propeller shafts, hot vessels for food and water, chemical processing equipment, gas turbines, aircraft, and tank trucks. Alloying Incoloy® with other elements can further increase its resistance to chemically corrosive environments such as sulfuric and phosphoric acids, and nuclear fuel.

High Performance with Continental Steel

Continental Steel is proud to supply high-performance superalloys for your specific application. Contact us today to learn how we can provide you with the solutions you need.

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Topics: high temp alloy, hastelloy, incoloy, high temperature alloys

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