Hastelloy C-22 and Hastelloy C-276 are both high performance alloys. They are widely used in corrosive applications in extreme environments. They play a key role in the chemical industry, marine engineering, oil and gas and other fields.

If you have some knowledge about nickel alloys, you must know that both these two Hastelloy alloys are nickel-chromium-molybdenum alloys. But, you might be wondering what exactly is the difference between them? Why is Hastelloy C-276 more commonly used than Hastelloy C-22?

This article will make an in-depth comparison of Hastelloy C-22 and Hastelloy C-276, and discuss their similarities and differences in chemical composition, mechanical properties, corrosion resistance, and applicable fields. By comparing the properties of these two alloys, I believe you will be able to better understand how to choose between these two alloys and how to take full advantage of their characteristics to ensure the reliability and performance of your equipment.

Overall, Hastelloy C-22 has better purity than Hastelloy C-276. Hastelloy C-22 has stricter controls on harmful elements such as sulfur, manganese, and phosphorus than Hastelloy C-276.

The higher purity allows Hastelloy C-22 to obtain higher high-temperature corrosion resistance, high-temperature mechanical properties, transient performance and durable performance than Hastelloy C-276.

The biggest difference between Hastelloy C-22 and Hastelloy C-276 is the corrosion resistance. Although they are both nickel-chromium-molybdenum alloys, their elemental ratios are not the same. Compared to Hastelloy C-276, Hastelloy C-22 has a higher chromium content and a lower molybdenum content. Therefore, relatively speaking, Hastelloy C-22 has better antioxidant properties, while Hastelloy C-276 has better anti-reduction properties.

In addition, because Hastelloy C-22 has better control of trace elements, it has better resistance to crevice corrosion at high temperatures than Hastelloy C-276.

Both Hastelloy C-22 and Hastelloy C-276 are solid solution alloys. Moreover, their mechanical properties are very balanced. Both alloys achieve decent strength through solid solution strengthening with molybdenum and tungsten.

However, strictly speaking, the mechanical properties of Hastelloy C-22 are slightly better than Hastelloy C-276. This is still due to its stricter control of harmful elements. This purity advantage is particularly evident in the yield strength. Hastelloy C-22 also has better plasticity than Hastelloy C-276.

Hastelloy C-22 Hastelloy C-276 has a very similar range of applications. In practical applications, we should consider more details, such as the specific working environment of the material. We need to select corresponding materials according to different corrosive substances.

Compared to Hastelloy C-276, the price of Hastelloy C-22 will be higher.

On the one hand, Hastelloy C-22 has higher requirements for the control of trace elements, which forces it to use higher purity metal raw materials during smelting. This in itself adds significant cost.

On the other hand, Hastelloy C-276 is used in larger quantities, and the larger quantity creates a scale advantage. The Hastelloy C-22 is relatively rare, and the cost of customization is relatively higher.

Therefore, even though Hastelloy C-276 has more high-priced elements (molybdenum and tungsten), it still costs less than Hastelloy C-22.

Hastelloy C-22 and Hastelloy C-276 are both nickel-chromium-molybdenum alloys. The biggest difference between them is the content of chromium and molybdenum. For this reason, Hastelloy C-22 is more suitable for working in oxidative corrosive environments, while Hastelloy C-276 is more suitable for reducing environments. But in general, they all have excellent overall corrosion resistance. In addition, Hastelloy C-22 has tighter controls on harmful elements. This gives it better overall performance at high temperatures. Hastelloy C-276 is relatively cheaper and therefore more commonly used than Hastelloy C-22.

We manufacture various products of Hastelloy C-22 and Hastelloy C-276 in strict compliance with standards. If you have corresponding purchasing needs, please contact us by email.