Hastelloy alloy C22's core design goal was to maintain the excellent reducing acid corrosion resistance of hastelloy C276 while significantly improving its performance in oxidizing media and as-welded conditions by adjusting its composition, and further enhancing its resistance to localized corrosion. HT PIPE is a hastelloy alloy c22 plate supplier with 15+ export experience. Contact us for more information and quotes for free!
mechnical properties of alloy c22 and alloy c276
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Hastelloy C22 | 8.69 g/cm3 | 1399 °C (2550 °F) | Psi – 1,00,000 , MPa – 690 | Psi – 45000 , MPa – 310 | 45% |
| Hastelloy C276 | 8.89 g/cm3 | 1370 °C (2500 °F) | Psi – 1,15,000 , MPa – 790 | Psi – 52,000 , MPa – 355 | 40% |
Chemical composition of hastelloy c22 and hastelloy c276 material
| Grade | UNS | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | Fe | Co≤ |
| C22 | N06022 | 0.015 | 0.5 | 0.02 | 0.02 | 0.08 | - | 20.0-22.5 | 12.5-14.5 | 2.0-6.0 | 2.5 |
| C276 | N10276 | 0.01 | 1.0 | 0.04 | 0.03 | 0.08 | - | 14.5-16.5 | 15.0-17.0 | 4.0-7.0 | 2.5 |
Preferred Applications for Hastelloy C22
Complex Mixed Chemical Environments: Process media contain both oxidizing and reducing components, or operating conditions fluctuate between oxidizing and reducing conditions.
Mixed Acid Processes in Chemical Plants: For example, mixed acid washes containing nitric and hydrofluoric acids.
Hydrometallurgy: The processes that need oxidative leaching.
Highly Oxidizing Environments: The processing hot concentrated nitric acid or FeCl₃-containing wastewater.
Equipment with complex weld structures or where post-weld heat treatment is not suitable: Hastelloy alloy C22 with its weldability can simplify the manufacturing process, reducing costs and risks, for large reactors, towers, and piping systems.
Applications with Extreme Safety and Reliability Requirements: As a newer alloy, Hastelloy alloy C22 offers a wider safety margin.
Situations Where Hastelloy C276 is Preferred
Environments with Predominantly Reducing Media: When handling hydrochloric and sulfuric acid environments without oxidizing impurities, the traditional advantages of alloy C276 may result in a slightly longer service life.
Applications Where hastelloy alloy C276 Has Already Has Successfully Used Without Issues: If an existing installation has been successfully operated with alloy C276 and has not experienced corrosion issues, continuing to use uns n10276 during spare part replacements is an economically sound option.
Cost Considerations: In certain periods and markets, hastelloy C276 may be slightly less expensive than Hastelloy alloy C22. If, after rigorous evaluation, C276's performance fully meets the requirements and oxidizing conditions are not present, then selecting asme hastelloy C276 can optimize project costs.
Processing and Manufacturing of alloy c22 and c276
Hastelloy alloy c22 n06022 and hastelloy c276 are difficult to machine, exhibiting a strong tendency to work-harden and poor thermal conductivity. Machining requires high-power equipment, sharp carbide tools, low cutting speeds, and ample coolant.
For hot forming, the recommended hot working temperature ranges are similar (C22: 1150-950°C, C276: 1150-1050°C). Both require rapid cooling to pass through the precipitation-sensitive temperature range.
For welding, both alloys are suitable for TIG and MIG welding. Welding consumables that match the base metal composition are recommended (C-22: ERNiCrMo-10, C-276: ERNiCrMo-4). Control heat input and ensure adequate back shielding gas during welding.
