Hastelloy X vs Hastelloy W – What’s the Difference

Hastelloy X vs Hastelloy W

In the industrial world, materials like Hastelloy X and Hastelloy W are making waves due to their strength and resistance to corrosion and heat. But what sets these two materials apart, and which is the better choice for your industrial application? This blog post will discuss the fundamental differences between Hastelloy X and Hastelloy W, their properties, and their specific applications. By the end of the post, you will be equipped with the knowledge to decide which is best suited for the needs of your industrial application.

What is Hastelloy X?

Hastelloy X is a type of nickel-chromium-iron-molybdenum alloy that is highly resistant to high temperatures and corrosion. It is often used in gas turbine engines, industrial furnaces, and other high-temperature environments. Hastelloy X’s resistance to oxidation makes it an ideal material for furnace components such as muffles, liners, and hot zones. Its high-temperature resistance makes it the ideal material for extreme applications such as rocket motor casings and aircraft jet engine afterburner components. In Hastelloy X, nickel, chromium, and molybdenum are highly corrosion-resistant in several acidic environments.

What is Hastelloy W?

Hastelloy W is another nickel-based alloy highly corrosion-resistant, even in harsh chemical environments. It contains copper, chromium, tungsten, and cobalt, making it excellent for components exposed to high-stress and extreme temperatures, such as gas turbine engines and heat exchangers. Hastelloy W’s excellent corrosion resistance properties, including chemical reactors, are ideal for extreme applications. Thanks to the addition of tungsten, Hastelloy W has a high resistance to localized corrosion.

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Difference Between Hastelloy X and Hastelloy W

Chemical Composition

Hastelloy X and Hastelloy W belong to a class of nickel-based alloys known as superalloys. Hastelloy X is an austenitic alloy, meaning that it has a face-centred cubic crystal structure. Hastelloy W is a precipitation-hardened alloy, meaning that it has a body-centred cubic crystal structure.

Tensile Strength

Hastelloy X has a higher tensile strength than Hastelloy W, making it more resistant to deformation under stress. However, Hastelloy W is more resistant to fracture than Hastelloy X.

Corrosion Resistance

Hastelloy X and Hastelloy W are highly corrosion-resistant in acidic and alkaline environments. However, Hastelloy W is slightly more resistant to corrosion than Hastelloy X.

Temperature Resistance

Hastelloy X can withstand higher temperatures than Hastelloy W without losing its strength or becoming brittle. As such, it is often used in applications where high temperatures are a concern, such as in jet engines and power plants.


Hastelloy X is typically more expensive than Hastelloy W due to its superior properties. However, both alloys are significantly more expensive than other nickel-based alloys.


In summary, Hastelloy X and Hastelloy W are high-performance alloys well-suited for specific industrial applications. However, their differences in composition and properties determine their suitability for different industrial applications. Understanding the fundamental differences between Hastelloy X and Hastelloy W allows you to decide which material is best for your industrial application. Always consult with your manufacturer to ensure that your application requires the right material to last long and withstand the test of time.



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