Inconel 625 vs Hastelloy C22 – What’s the Difference

Inconel 625 vs Hastelloy C22

For individuals and manufacturing companies to have a basic understanding of metals and alloys when selecting materials for different applications. The engineering industry uses various metals and alloys, each having unique properties and characteristics. Two of the most commonly used materials in the industry are Inconel 625 and Hastelloy C22. If you wonder which alloys best suit your next project, this article will help explain their differences.

Difference Between Inconel 625 and Hastelloy C22

Chemical Composition:

Inconel 625 is a nickel-chromium-molybdenum alloy that also contains niobium. On the other hand, Hastelloy C22 is a nickel-molybdenum-chromium-tungsten alloy containing cobalt. Both alloys are fully austenitic and highly corrosion-resistant but with different compositions.

Corrosion Resistance:

Both of these alloys are known for their outstanding corrosion resistance. However, Hastelloy C22 has superior corrosion resistance to Inconel 625 in most environments, including harsh acidic conditions. It has been specifically designed to resist the most severe types of corrosion, while Inconel 625 has a broad range of applications, from high-temperature applications in turbines and furnace components to seawater environments.

Strength:

Inconel 625 has high strength, even at elevated temperatures. It maintains its strength over a wide temperature range and has good weldability, making it easy to work with. Hastelloy C22 has excellent strength and ductility, even at very high temperatures. The presence of tungsten greatly improves its high-temperature strength.

Cost:

In terms of cost, Inconel 625 is generally more affordable than Hastelloy C22. This is mainly because Hastelloy C22 contains cobalt and tungsten, which are more expensive metals, in addition to having superior corrosion resistance, which is factored in their desirability.

Applications:

Inconel 625 is commonly used in applications such as erosion shields, heat exchangers, nuclear reactors, pipelines, and chemical processing plants. Hastelloy C22, on the other hand, is favoured for its excellent corrosion resistance in acid environments such as petrochemical plants, chemical processing plants, and pulp and paper mills.

Conclusion:

In conclusion, Inconel 625 and Hastelloy C22 are both high-performance alloys with unique properties and advantages. The main differences between the two are their chemical composition, corrosion resistance, strength, and cost. If you’re looking for a more affordable option for your application, Inconel 625 may be the best choice. However, if you require the absolute best in corrosion resistance, consider Hastelloy C22. Always verify the needs and requirements of the project before selecting the right metal or alloy.

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