Hastelloy C22 and C276 are nickel-chromium-molybdenum alloys with exceptional corrosion resistance and strength. However, they differ in composition and application, making them suited for a variety of situations. Here are the main distinctions between Hastelloy C22 and C276 pipes.
Composition
Hastelloy C22:
Contains more chromium than C276, typically around 20-22%.
Has a slightly higher tungsten content.
Designed with an enhanced resistance to oxidizing environments.
Hastelloy C276:
Has a slightly higher molybdenum content.
Contains more nickel and less chromium compared to C22.
Known for its versatility and effectiveness in reducing environments.
Corrosion Resistance
Hastelloy C22: Offers better resistance to oxidizing environments such as those containing wet chlorine gas, nitric acid, or ferric acids. It is also highly resistant to crevice corrosion and pitting.
Hastelloy C276: While it also has excellent corrosion resistance, it is particularly noted for its resistance to reducing environments and to acids such as hydrochloric and sulfuric acid.
Applications
Hastelloy C22: Used in applications where resistance to a wide range of corrosive environments is required, including chemical processing, pollution control, and waste treatment.
Hastelloy C276: Often used in industries where exposure to corrosive chemicals is a concern, including chemical processing, petrochemical, and oil and gas industries.
Mechanical Properties
Both alloys exhibit similar mechanical properties, including high tensile strength and excellent fabricability. However, specific mechanical properties may vary slightly depending on the precise composition and treatment of the material.
Cost
Generally, Hastelloy C22 is more expensive due to its higher chromium content and enhanced resistance to certain types of corrosion.
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