Application advantages and limitations of Hastelloy C22 and C276 pipes
Hastelloy C22 and C276 alloy pipes are highly regarded nickel-chromium-molybdenum alloys renowned for their excellent corrosion resistance and mechanical properties. Both Hastelloy C22 and C276 are ideal for use in highly corrosive environments, particularly in industries such as chemical processing, pollution control, pharmaceuticals, and waste management.
What are Hastelloy C276 Pipe used for?
Hastelloy C276 seamless pipes are widely used in the oil and gas industry, particularly in harsh environments and with corrosive fluids. These pipes are commonly found in offshore platforms, refineries, and petrochemical plants.
What is Hastelloy C22 tubing?
Hastelloy C22 tubing is a nickel-chromium-molybdenum alloy containing small amounts of iron and tungsten. It offers strong resistance to oxidizing and reducing chemicals. It performs well in acidic environments such as nitric, hydrochloric, and sulfuric acids.
What is Hastelloy C276 tubing?
Hastelloy C276 tubing is also a nickel-chromium-molybdenum alloy, but compared to C22, it has a higher molybdenum content, a lower chromium content, and contains small amounts of cobalt and tungsten. C276 tubing is resistant to a wide range of corrosive chemicals and performs well in both oxidizing and non-oxidizing environments.
Hastelloy C22 vs. C276 Piping
Below is a side-by-side comparison of Hastelloy C22 and Hastelloy C276 piping based on their performance and applications:
Corrosion Resistance
C22: excels in oxidizing environments such as nitric acid and chlorine-rich environments.
C276: performs better in reducing environments such as hydrochloric and sulfuric acids.
Chemical Compatibility
C22: well-suited for handling strong oxidizers and mixed acid environments.
C276: more suitable for chemical environments containing chlorides and high impurities.
Weldability and Fabricability
C22: easier to weld and fabricate, typically eliminating the need for post-weld heat treatment.
C276: may require more care during welding, including post-weld treatment for certain applications.
Applications
C22: commonly used in pollution control, marine environments, and chemical processing.
C276: commonly used in power plants, food systems, and environments with unpredictable chemical exposure.
Cost
Both grades are high-quality alloys that cost more than stainless steel, but their durability and reduced maintenance make them a long-term value. Performance under Mixed Conditions
C22: Offers strong resistance to pitting and crevice corrosion under oxidizing conditions.
C276: More flexible under varying chemical conditions.
C22 offers greater resistance to oxidation. C276 offers more reliable resistance to reduction. Both grades are more expensive than standard stainless steel, but their reliability and long life help reduce system failures, maintenance requirements, and downtime.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
