What is Hastelloy C22?
Hastelloy C22 is a type of alloy known for its excellent corrosion resistance. It is made up of various metals and is used in industries where materials are exposed to harsh environments, such as chemical processing and power generation. This alloy can withstand high temperatures and a variety of corrosive chemicals, making it a preferred choice for many industrial applications.
Hastelloy C22 Chemical Composition
| Element | Percentage (%) |
| Nickel (Ni) | 56.0 – 63.0 |
| Chromium (Cr) | 20.0 – 22.5 |
| Molybdenum (Mo) | 12.5 – 14.5 |
| Iron (Fe) | 2.0 – 6.0 |
| Tungsten (W) | 2.5 – 3.5 |
| Cobalt (Co) | 2.5 max |
| Manganese (Mn) | 0.5 max |
| Vanadium (V) | 0.35 max |
| Silicon (Si) | 0.08 max |
| Phosphorus (P) | 0.02 max |
| Sulfur (S) | 0.02 max |
| Carbon (C) | 0.01 max |
Hastelloy C22 Equivalent Material
| Standard | Equivalent Material |
| UNS | N06022 |
| DIN | 2.4602 |
| ASTM | B575, B619, B622 |
| ISO | 6208 |
Hastelloy C22 Applications
Hastelloy C22 is used in a variety of applications due to its superior corrosion resistance. Some common uses include:
Chemical Processing: Used in reactors, heat exchangers, and other equipment where strong acids are present.
Pharmaceutical Industry: Ideal for equipment that must remain contaminant-free.
Pollution Control: Used in systems designed to remove harmful substances from emissions.
Marine Environments: Suitable for use in seawater and brine solutions.
What is Hastelloy C276
Hastelloy C276 is another type of corrosion-resistant alloy. Similar to Hastelloy C22, it is used in environments that require resistance to harsh chemicals and high temperatures. This alloy is particularly well-suited for industries where there is a need for reliable and long-lasting materials.
Hastelloy C276 Chemical Composition
| Element | Composition (%) |
| Nickel (Ni) | 57 |
| Molybdenum (Mo) | 16 |
| Chromium (Cr) | 15.5 |
| Iron (Fe) | 5 |
| Tungsten (W) | 3.5 |
| Cobalt (Co) | 2.5 |
| Manganese (Mn) | 1 |
| Vanadium (V) | 0.35 |
| Silicon (Si) | 0.08 |
| Carbon (C) | 0.01 |
Hastelloy C22 Equivalent Material
| Standard | Equivalent Material |
| UNS | N06022 |
| DIN | 2.4602 |
| ASTM | B575, B619, B622 |
| ISO | 6208 |
Hastelloy C276 Applications
Chemical Processing: Suitable for use in equipment handling sulfuric acid, hydrochloric acid, and other aggressive chemicals.
Pulp and Paper Industry: Used in bleaching vessels and digesters.
Waste Treatment: Ideal for handling waste streams that contain mixed acids and solvents.
Oil and Gas Industry: Used in sour gas wells and for components exposed to hydrogen sulfide.
Difference Between Hastelloy C22 and C276
While both Hastelloy C22 and C276 are known for their corrosion resistance, they have some differences:
Corrosion Resistance: Hastelloy C22 has a higher chromium content (22%) compared to C276 (16%), making it more resistant to oxidizing and reducing environments. However, C276 has better resistance to localized corrosion such as pitting and crevice corrosion.
Temperature Resistance: Both alloys have excellent high-temperature strength and can withstand extreme temperatures. However, C276 has a slightly higher melting point compared to C22.
Weldability: Hastelloy C22 is easier to weld than C276 due to its lower carbon content and the addition of copper in its composition.
Mechanical Properties: While both alloys have similar mechanical properties, Hastelloy C276 has a slightly higher tensile strength and yield strength compared to C22. Hastelloy C22 is more resistant to oxidizing acids, such as nitric acid. Hastelloy C276 offers superior resistance to reducing acids, such as hydrochloric acid.
Thermal Stability: Hastelloy C276 is known for its better thermal stability, making it suitable for high-temperature applications. Hastelloy C22, while stable, is often used in lower-temperature corrosive environments.
Fabricability: Both alloys are considered highly fabricable, but C276 is slightly easier to weld due to its composition.
Summary
Hastelloy C22 and C276 are both exceptional alloys known for their resistance to corrosion and ability to withstand harsh environments. They are used in a variety of industries, including chemical processing, pharmaceuticals, pollution control, and marine applications. While they share many similarities, their differences in chemical composition make them suitable for different types of environments and specific applications.
