Hastelloy vs Alloy 20 – What’s the Difference

Hastelloy vs Alloy 20

For those who work in metals and alloys to understand the differences between different materials used in various industries. Two alloys that are often compared are Hastelloy and Alloy 20. These alloys have different properties and are used in various applications, so it’s important to know their differences. In this blog post, we’ll dive into the differences between Hastelloy and Alloy 20, their properties, and their uses.

What is Hastelloy?

It is an alloy of nickel, molybdenum, and chromium known for its strength and resistance to corrosion. The alloy’s properties make it suitable for applications in extreme environments like chemical processing plants or highly corrosive industrial settings. It can also be used in medical implants due to its biocompatibility.

What is Alloy 20?

Alloy 20 is a high-alloy austenitic stainless steel designed for optimal corrosion resistance in the harsh environment of chemical plants and seawater applications. It is also known as Carpenter 20 or Incoloy 20. It contains nickel, chromium, molybdenum, and copper, which gives it excellent corrosion resistance properties. Its weldability and formability are superior to many other alloys making it a great choice for various industrial uses.

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Difference Between Hastelloy and Alloy 20


Hastelloy and Alloy 20 are different alloys composed of different elements. Hastelloy is a nickel-based alloy which contains molybdenum, chromium, iron, and other elements. On the other hand, Alloy 20 is an austenitic stainless steel alloy composed of nickel, chromium, molybdenum, and copper—the difference in composition results in different properties of the alloys.

Corrosion Resistance

Both Hastelloy and Alloy 20 have high corrosion resistance. However, Hastelloy is known to have higher resistance to various corrosive environments such as acidic, alkaline, and saline. Alloy 20 is resistant to stress corrosion cracking, pitting, and general corrosion. However, Hastelloy performs better than Alloy 20 regarding sulfuric acid, hydrochloric acid, and nitric acid resistance.

Mechanical Properties

Hastelloy has excellent mechanical properties, making it ideal for high-temperature and high-stress environments. It has high tensile strength, good flexibility, and toughness. Alloy 20 has good mechanical properties but is weaker than Hastelloy. Alloy 20 is a ductile metal with good elongation and toughness.


Hastelloy is used in various applications, such as chemical processing industries, nuclear power plants, and aerospace industries. It’s used to produce chemicals, petrochemicals, and marine engineering equipment. Alloy 20, on the other hand, finds applications in sulfuric acid production, food processing industries, and pharmaceuticals. It also produces heat exchangers, mixing tanks, and process piping systems.


The cost of Hastelloy is higher than Alloy 20. Hastelloy is a specialized alloy that is designed for use in extreme environments. It has advanced properties, which make it more expensive than Alloy 20. Alloy 20 is more commonly used, costing less than Hastelloy.


Hastelloy and Alloy 20 are alloys with different chemical compositions, mechanical properties, corrosion resistance, and applications. While both alloys are used in various industries, their performance and behaviour vary based on the environment and the application. Understanding the differences between these two alloys can help you make the right choice when selecting the right material for your application. If you’re looking for a cost-effective solution and don’t require extreme corrosion resistance, then Alloy 20 is a good choice. But if you need better performance in challenging environments, Hastelloy is the way to go.



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