Gnee Steel is a company specializing in the production of Hastelloy C276 alloy products, Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs.
Comparison of Hastelloy C276 flanges and Hastelloy C22 flanges
Comparison of Hastelloy C276 flanges and Hastelloy C22 flanges
Hastelloy C22 flanges offer superior resistance to oxidation, pitting, and crevice corrosion compared to C276, making them ideal for highly corrosive, mixed acid, or pharmaceutical environments. Hastelloy C276 flanges perform well in reducing environments, possess high strength, and are generally more cost-effective in chemical processing applications. C22 has a higher chromium content (20-22.5%), while C276 has a higher molybdenum content (15-17%).
What are the uses of Hastelloy C276?
Hastelloy C276 is used in the chemical, marine, and power industries. It is also used in wastewater treatment and pollution control equipment. It is commonly used in pipes, fittings, heat exchangers, and pressure vessels. Its superior performance makes it a reliable choice in extreme environments.
What are Hastelloy C276 flanges and Hastelloy C22 flanges?
Both Hastelloy C276 and Hastelloy C22 flanges are made from nickel, molybdenum, chromium, and iron alloys. Compared to Hastelloy C22, Hastelloy C276 exhibits higher corrosion resistance in a variety of highly corrosive media (such as acids mixed with chlorides, including hypochlorite solutions).
It also offers better resistance to pitting or crevice corrosion in reducing, neutral, and oxidizing environments compared to similar alloys.
Furthermore, it is more suitable for applications at temperatures up to 1500°F (816°C). In summary, the main difference between these two alloys is that Hastelloy C276 has superior resistance to chloride stress corrosion cracking and higher temperature resistance than the other alloy.
Difference Between Hastelloy C276 Flanges vs Hastelloy C22 Flanges
Chemical Composition: Hastelloy C-276 Flanges vs Hastelloy C-22 Flanges
| Element | Hastelloy C-276 (UNS N10276) Content (%) | Hastelloy C-22 (UNS N06022) Content (%) |
|---|---|---|
| Nickel | 57.0 min (Balance) | Balance |
| Chromium | 14.5 – 16.5 | 20.0 – 22.5 |
| Molybdenum | 15.0 – 17.0 | 12.5 – 14.5 |
| Iron | 4.0 – 7.0 | 2.0 – 6.0 |
| Tungsten | 3.0 – 4.5 | 2.5 – 3.5 |
| Cobalt | ≤ 2.5 | ≤ 2.5 |
| Vanadium | ≤ 0.35 | – |
| Manganese | ≤ 1.0 | ≤ 0.50 |
| Silicon | ≤ 0.08 | ≤ 0.08 |
| Carbon | ≤ 0.01 | ≤ 0.010 |
| Phosphorus | ≤ 0.04 | ≤ 0.02 |
| Sulfur | ≤ 0.03 | ≤ 0.02 |
Physical Properties: Hastelloy C-276 Flanges vs Hastelloy C-22 Flanges
| Property | Hastelloy C-276 Flanges (Annealed) | Hastelloy C-22 Flanges (Annealed) |
|---|---|---|
| Density | 8.89 g/cm³ (0.321 lb/in³) | 8.69 g/cm³ (0.314 lb/in³) |
| Melting Range | 1323 – 1371°C (2415 – 2500°F) | 1357 – 1399°C (2475 – 2550°F) |
| Coefficient of Thermal Expansion (20-100°C) | 11.2 µm/m·°C | 11.5 µm/m·°C |
| Thermal Conductivity | 11.1 W/m·K | 10.2 W/m·K |
| Specific Heat | 427 J/kg·K | 422 J/kg·K |
Hastelloy C276 and C22 Flange Corrosion Resistance
Hastelloy C276 and C22 flanges are renowned for their excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking. However, the corrosion resistance of these two alloys varies depending on the environment. C276 exhibits superior corrosion resistance in oxidizing media, while C22 is better suited for resisting acidic solutions containing reducing agents (such as chlorine and sulfuric acid).
Hastelloy C276 and Hastelloy C22 are two of the most commonly used flange alloys due to their outstanding corrosion resistance. Specifically, Hastelloy C276 offers superior performance in terms of pitting corrosion resistance, stress corrosion cracking resistance, and resistance to oxidizing conditions compared to other nickel-molybdenum-based alloys such as Hastelloy C22. Even under high concentrations or high temperatures, this alloy demonstrates excellent corrosion resistance to chlorine-containing environments as well as acetic acid, formic acid, phosphoric acid, and sulfuric acid.
C22 and C276 Flange Applications
C22 Flanges: Suitable for pharmaceutical, sanitary, and mixed acid environments.
C276 Flanges: Suitable for demanding reductive chemical processing applications.
Summary and comparison of Hastelloy C22 and C276 flanges
| Feature | Hastelloy C276 Flanges | Hastelloy C22 Flanges |
|---|---|---|
| Primary Advantage | Best for Reducing Environments | Best for Oxidizing & Mixed Acid |
| Chromium Content | Lower (~16%) | Higher (~22%) |
| Molybdenum Content | Higher (~16%) | Lower (~13%) |
| Weldability | Good | Excellent (superior in HAZ) |
| Cost | High | Higher |
| Common Uses | Chemical Processing, Pollution Control | Pharmaceutical, Sanitary, Power Generation |
Gnee Steel is a professional manufacturer 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. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.