Hastelloy C276 vs Alloy 20 – What’s the Difference

Hastelloy C276 vs Alloy 20

Choosing the right materials for your project can be overwhelming. With the wide variety of metals and alloys, it takes time to determine which is best for your application. This blog post will discuss the two common corrosion-resistant materials – Hastelloy C276 and Alloy 20. Understanding these two metals’ differences can help you make informed project decisions.

Hastelloy C276 and Alloy 20 are nickel-based corrosion-resistant alloys, but their chemical composition and properties differ in many ways. Let’s take a closer look at them:

What is Hastelloy C276?

Hastelloy C276 is an alloy made of nickel, molybdenum and chromium. It is highly corrosion-resistant and has excellent mechanical properties, making it ideal for various industrial applications such as chemical processing, marine engineering and nuclear power generation. Its high-temperature capability suits it in many challenging environments where other alloys may fail.

What is Alloy 20?

Alloy 20 is a nickel-iron-chromium alloy with copper and molybdenum elements added to enhance its corrosion resistance. It is particularly resistant to sulfuric, phosphoric, and nitric acids. The alloy has high strength at elevated temperatures up to 600°F (316°C), excellent mechanical properties, weldability, formability and fabricability characteristics. It can be used in various industrial applications for chemical processing equipment components like tanks, pumps, valves and pickling hookups.

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Difference Between Hastelloy C276 and Alloy 20

Chemical Composition

Hastelloy C276 contains more nickel, molybdenum, and chromium than Alloy 20. It also has a small quantity of tungsten, which provides increased resistance to localized corrosion. On the other hand, Alloy 20 has a higher concentration of copper and a small amount of niobium.

Corrosion Resistance

Both alloys are known for their exceptional corrosion resistance properties. However, Hastelloy C276 is more resistant to various corrosive media, including sulfuric acid, hydrochloric acid, and chlorides. Alloy 20 is also resistant to sulfuric acid and chlorides but is not recommended for use with hydrochloric acid.

Strength and Heat Resistance

Hastelloy C276 provides high strength and excellent heat resistance, making it an ideal material choice for high-temperature applications. Meanwhile, Alloy 20 is a versatile alloy with high strength and good ductility.


Both alloys provide good weldability, but Hastelloy C276 is more challenging to weld due to its high molybdenum and tungsten content. It requires specialized welding techniques to achieve the desired results. Alloy 20, on the other hand, is relatively easy to weld and does not require special welding procedures.


The cost of these alloys can vary depending on the supplier and the quantity you need. Generally, Hastelloy C276 is more expensive than Alloy 20 due to its higher nickel and molybdenum content.


In conclusion, both Hastelloy C276 and Alloy 20 are excellent materials for corrosion-resistant applications, but they differ. If you need a material that provides excellent corrosion resistance to a wide range of media, Hastelloy C276 may be the ideal choice. On the other hand, if you need a versatile and cost-effective alloy that provides high strength and good ductility, Alloy 20 may be a better option. Regardless of your choice, it’s essential to consult with a knowledgeable supplier to determine the best material for your specific needs.



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