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Alloy C22 Technical Overview
Hastelloy C22 (UNS N06022) is a versatile nickel-chromium-molybdenum-tungsten alloy with better overall corrosion resistance than other Ni-Cr-Mo alloys available today, including Hastelloy C-276, C-4, and A-625. Alloy C22 has outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. It has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chloride ions. Steel Emporium supplies Grade C22 pipes and tubes that are extensively used in the most severe environments found in chemical processing, pollution control, and waste treatment.
Key Material Advantages
Total Versatility
Resists both oxidizing and reducing media, making it a "multi-purpose" alloy.
Corrosion Immunity
Superior resistance to weld-heat affected zone attack and pitting.
High Ductility
Excellent weldability and ease of fabrication for complex systems.
| Grade | Ni | Cr | Mo | W | Fe | Co | C | Mn | Si |
|---|---|---|---|---|---|---|---|---|---|
| Hastelloy C22 | Balance | 20.0 - 22.5 | 12.5 - 14.5 | 2.5 - 3.5 | 2.0 - 6.0 | 2.5 max | 0.015 max | 0.50 max | 0.08 max |
| Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength | 690 MPa | 100,000 psi |
| Yield Strength (0.2% offset) | 310 MPa | 45,000 psi |
| Elongation (% in 50mm) | 45% | 45% |
| Hardness (Rockwell B) | 88 HRB | - |
| Property | Value |
|---|---|
| Density | 8.69 g/cm³ (0.314 lb/in³) |
| Melting Range | 1357 - 1399 °C (2475 - 2550 °F) |
| Specific Heat | 428 J/kg·°C (0.102 Btu/lb·°F) |
| Electrical Resistivity | 1.14 µΩ·m |
| Standard | UNS Number | Werkstoff No. | AFNOR | Common Name |
|---|---|---|---|---|
| Alloy C22 | N06022 | 2.4602 | NiCr21Mo14W | Hastelloy C22 |
| Nominal Size (NB) | OD (mm) | SCH 10 | SCH 40 | SCH 80 |
|---|---|---|---|---|
| 1/2" | 21.34 | 1.38 | 1.76 | 2.30 |
| 1" | 33.40 | 2.27 | 3.51 | 4.61 |
| 2" | 60.33 | 4.27 | 5.91 | 8.12 |
| 3" | 88.90 | 7.31 | 12.35 | 16.65 |
| 4" | 114.30 | 12.01 | 17.51 | 24.32 |
Industrial Applications
Pharmaceutical
Multi-purpose reactors and clean-room piping.
Chemical Process
Chlorination systems and nitric acid processing.
FGD Systems
Scrubbers for flue gas desulfurization.
Waste Treatment
Hazardous waste liquid incineration systems.
Marine Industry
Desalination and offshore sour gas systems.
Nuclear Fuel
Fuel reprocessing and high-level waste tanks.