Alloy C22 (Hastelloy® C-22) is a nickel-chromium-molybdenum alloy developed for exceptional resistance to localized corrosion (pitting and crevice corrosion) and excellent performance against stress corrosion cracking in highly aggressive environments. Thanks to its balanced alloying concept, C22 performs well in both oxidizing and reducing media and is frequently selected for mixed-acid environments where many conventional materials show limited reliability.
The alloy’s high chromium content supports strong resistance in oxidizing conditions, while molybdenum and tungsten enhance resistance in reducing acids and provide excellent pitting and crevice corrosion resistance in acid/halide environments. This makes Alloy C22 a preferred choice for chemical processing equipment, pollution control systems and waste treatment installations where corrosion mechanisms can vary within one process.
Alloy C22 is also known as Werkstoff 2.4602 and UNS N06022. Steelinox B.V. supplies this grade in multiple product forms such as round bar, forgings, plates, custom-cut plates and tubes. Certification is available according to EN 10204 / 3.1.
| Element | Typical range (wt. %) |
|---|---|
| Ni | Balance |
| Cr | 20.0 – 22.5 |
| Mo | 12.5 – 14.5 |
| Fe | 2.0 – 6.0 |
| W | 2.5 – 3.5 |
| C | ≤ 0.015 |
| Mn | ≤ 0.50 |
| Si | ≤ 0.08 |
| P | ≤ 0.02 |
| S | ≤ 0.02 |
Exact melt composition is confirmed on the EN 10204 / 3.1 certificate for the supplied batch.
| Property | Typical value (annealed) |
|---|---|
| Tensile strength (Rm) | ≥ 690 MPa |
| Yield strength (Rp0.2) | ≥ 310 MPa |
| Elongation (A5) | ≥ 45 % |
| Hardness | approx. ≤ 240 HB |
| Impact toughness | per standard / see EN 10204 3.1 certificate |
Exact values are stated on the material certificate EN 10204 / 3.1.
Hastelloy® C22 / Alloy C22 (2.4602 / UNS N06022) is supplied in round bar, forgings, plates, custom-cut plates and tubes. It is normally delivered in annealed condition to support optimal corrosion resistance and good formability. Additional product forms and processing routes may be available on request depending on specification.
Round bar: 8 mm – 310 mm (other dimensions on request)
Plates, tubes, forgings and custom cutting are available on request depending on the required standard and availability.
Centerless grinding available on request. Provide diameter, tolerance class, straightness and surface finish requirements for precision shafts or components.
Alloy C22 is commonly selected for installations where the process environment can vary between oxidizing, reducing and mixed-acid conditions, and where localized corrosion resistance is critical. Typical applications include:
The high chromium, molybdenum and tungsten contents provide outstanding resistance to localized corrosion such as pitting and crevice attack. The alloy also performs well in both oxidizing and reducing acids, including mixed-acid environments. This versatility is one of the main reasons Alloy C22 is used in extremely aggressive chemical service.
Yes. Alloy C22 offers excellent resistance to chloride-induced pitting and crevice corrosion and is also highly resistant to chloride stress corrosion cracking. It is therefore often chosen for seawater, brines and process streams containing chlorides. For critical applications, the full service conditions (temperature, chloride level, oxidizers, flow) should be reviewed.
Alloy C22 is designed to perform well in both oxidizing and reducing acidic environments. Chromium supports resistance in oxidizing conditions, while molybdenum and tungsten enhance performance in reducing acids. This makes the alloy particularly suitable when the process chemistry varies or when mixed acids are present.
Yes. Alloy C22 can be welded using appropriate filler materials and qualified procedures. Its composition helps reduce the risk of hot cracking and supports corrosion performance in the weld and heat-affected zone. Post-weld heat treatment is generally not required for corrosion resistance, but fabrication procedures should be aligned with the project specification.
Steelinox B.V. supplies Hastelloy® C22 / Alloy C22 (2.4602 / UNS N06022) in round bar, forgings, plates, custom-cut plates and tubes. Round bar is typically available from 8 mm to 310 mm, with other dimensions available on request.
Yes, tubes and piping-related products can be supplied on request depending on specification. Typical availability includes seamless and welded tubes, as well as flanges and fittings to ASTM/ASME or EN standards. Please specify the required standard, size range and wall thickness (or schedule) when requesting a quote.
Yes. We can supply machined components and centerless ground bar on request. This is common for shafts, fasteners and high-precision parts. Provide drawings or detailed dimensional, tolerance and surface finish requirements when requesting a quotation.
Certificates: EN 10204 / 3.1
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