Hastelloy C-22
UNS N06022
Overview
Advanced nickel-chromium-molybdenum alloy with superior resistance to oxidizing environments compared to C-276. The higher chromium content (20-22.5%) provides outstanding resistance to ferric chlorides, cupric chlorides, and other oxidizing media that challenge C-276. Excellent weldability with little loss of corrosion resistance in the heat-affected zone. The most versatile of the Hastelloy C-family for complex mixed-acid environments.
Chemical Composition (wt%)
| Element | Min | Max |
|---|---|---|
| Ni (Nickel) | 56 | — |
| Cr (Chromium) | 20 | 22.5 |
| Mo (Molybdenum) | 12.5 | 14.5 |
| W (Tungsten) | 2.5 | 3.5 |
| Fe (Iron) | 2 | 6 |
| C (Carbon) | — | 0.015 |
| Mn (Manganese) | — | 0.5 |
| Si (Silicon) | — | 0.08 |
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | ≥ 690 MPa (100 ksi) | — |
| Yield Strength (0.2%) | ≥ 310 MPa (45 ksi) | — |
| Elongation | ≥ 45% | — |
| Hardness | ≤ 22 HRC | annealed |
| Density | 8.69 g/cm³ | — |
Physical Properties
| Property | Value |
|---|---|
| Melting Range | 1357 – 1399 °C |
| Thermal Conductivity | 12.5 W/m·K (at 23°C) |
| Max Service Temp | 1093°C |
Corrosion Resistance
Superior to C-276 in oxidizing environments including ferric chlorides, cupric chlorides, and dissolved oxygen/chlorine combinations. Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. Outstanding performance in complex mixed-acid environments where both oxidizing and reducing species are present. The best all-around alloy for unpredictable process streams.
Typical Applications
Related Standards
Available Products in This Material
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