Hastelloy X vs Haynes 282 – What’s the Difference

Hastelloy X vs Haynes 282

In the world of metal and alloy engineering, choosing between different materials can often be crucial. Two popular alloys with excellent mechanical properties are Hastelloy X and Haynes 282. Both are known for their strength, heat resistance, and corrosion resistance. However, it is essential to understand the distinction between the two alloys and their unique properties. In this guide, we will break down the difference between Hastelloy X and Haynes 282 to help you make an informed decision.

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Difference Between Hastelloy X and Haynes 282

Composition

Hastelloy X is a nickel-based alloy primarily composed of nickel, chromium, and molybdenum. It also contains insignificant amounts of iron, cobalt, and tungsten. On the other hand, Haynes 282 is a nickel-based alloy that contains chromium, iron, molybdenum, titanium, and aluminium. The titanium and aluminium in Haynes 282 create a gamma-prime phase within the matrix, leading to superior creep and strength properties compared to Hastelloy X.

Heat Resistance

Both Hastelloy X and Haynes 282 are high-temperature alloys with exceptional resistance to heat and oxidation. However, Haynes 282 has a higher melting point than Hastelloy X, making it more suitable for use in high-temperature environments such as furnaces, heat exchangers, and gas turbines. Hastelloy X is ideal for use in temperatures up to 2200°F and can maintain excellent mechanical properties after exposure to temperatures up to 1600°F.

Corrosion Resistance

Both alloys exhibit corrosion resistance to various acids, alkalis, and other corrosive chemicals. Hastelloy X has better resistance to sulfuric acid than Haynes 282. On the other hand, Haynes 282 has exceptional resistance to aqueous corrosion, including chloride and acids containing chloride. It also retains its corrosion resistance at high temperatures compared to Hastelloy X.

Weldability

Hastelloy X and Haynes 282 are highly weldable and can be welded using standard TIG, MIG, and stick welding methods. Haynes 282 has slightly better weldability than Hastelloy X because of its lower carbon content, reducing the risk of carbide precipitation and subsequent cracking.

Cost

The cost of Hastelloy X and Haynes 282 can be a determining factor when selecting between the two alloys. Hastelloy X is relatively expensive due to the high nickel content and other expensive alloying elements like molybdenum. On the other hand, Haynes 282 is more cost-effective due to the lower nickel content and the ability to replace more expensive materials like Hastelloy X and Inconel.

Conclusion

In conclusion, choosing between Hastelloy X and Haynes 282 largely depends on the application and environment in which they are used. Both alloys have excellent mechanical properties and resistance to heat and corrosion. However, Haynes 282 performs better in high-temperature environments due to its higher melting point and superior creep and strength properties. Similarly, Hastelloy X may be more suitable for applications requiring improved sulfuric acid resistance. Ultimately, the cost of the alloys may significantly impact the decision, with Haynes 282 being a more cost-effective option. By understanding the differences between Hastelloy X and Haynes 282, you can make the right decision that suits your needs.

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