ZYTC Alloy is an ISO 9001 and AS 9120B certified superalloy manufacturer and supplier, offering Alloy C22 (2.4602) at factory-direct prices with full material traceability and fast global delivery. Alloy C22 (Hastelloy C-22 / UNS N06022 / Werkstoff 2.4602) 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, Alloy C22 performs well in both oxidizing and reducing media and is frequently selected for mixed-acid environments where many conventional materials show limited reliability.
Product Forms & Availability – Alloy C22 (2.4602 / UNS N06022)| Product Form | Availability |
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| Round Bar | Available | | Forgings | Available | | Plates | Available | | Custom-Cut Plates | Available | | Tubes | Available |
Additional Product Forms| Product Form | Availability |
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| Sheet | Available | | Strip | Available | | Wire | Available | | Pipe | Available |
For all stock availability, contact Sales.
Specifications – Alloy C22 (2.4602 / UNS N06022)| Specification | Description |
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| UNS N06022 | Unified numbering system | | W. Nr. 2.4602 | Werkstoff designation | | Hastelloy® C-22 | Trade name | | ASTM B574 | Bar specification | | ASTM B575 | Plate, sheet, strip | | ASTM B622 | Seamless pipe and tube | | ASTM B619 | Welded pipe and tube | | ASME SB574 | Boiler code – bar | | ASME SB575 | Boiler code – plate |
Operating Conditions & Selection CriteriaAlloy C22 is specified when designers require a nickel-chromium-molybdenum alloy with exceptional resistance to localized corrosion and stress corrosion cracking in highly aggressive mixed-acid environments. Service Temperature Range: Suitable for applications up to 315°C (600°F) in corrosive service; higher temperatures for non-corrosive service Corrosion Resistance: Outstanding performance in both oxidizing and reducing media — balanced alloying concept provides versatility Oxidizing Conditions: High chromium content (20.0-22.5%) provides strong resistance Reducing Acids: Molybdenum (12.5-14.5%) and tungsten (2.5-3.5%) enhance resistance Pitting & Crevice Corrosion: Exceptional resistance in acid/halide environments Stress Corrosion Cracking: Excellent resistance to chloride-induced SCC Mixed-Acid Environments: Preferred choice where corrosion mechanisms vary within one process
Chemical Composition| Chemical Composition (Weight %) | Alloy C22 (UNS N06022) Specification |
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| Nickel (Ni) | Balance (approx. 56%) | | Chromium (Cr) | 20.0 - 22.5 | | Molybdenum (Mo) | 12.5 - 14.5 | | Tungsten (W) | 2.5 - 3.5 | | Iron (Fe) | 2.0 - 6.0 | | Cobalt (Co) | 2.5 max. | | Carbon (C) | 0.010 max. | | Manganese (Mn) | 0.50 max. | | Silicon (Si) | 0.080 max. | | Vanadium (V) | 0.35 max. | | Phosphorus (P) | 0.020 max. | | Sulfur (S) | 0.020 max. |
| Physical Properties | Metric | Imperial |
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| Density | 8.69 g/cm³ | 0.314 lb/in³ | | Melting Range | 1350 - 1400°C | 2460 - 2550°F | | Modulus of Elasticity | 205 GPa | 29.7 × 10⁶ psi | | Coefficient of Expansion (20-100°C) | 12.4 µm/m·°C | 6.9 µin/in·°F | | Thermal Conductivity | 10.1 W/m·K | 70 BTU·in/hr·ft²·°F | | Electrical Resistivity | 1.29 µΩ·m | 1.29 µΩ·m |
| Mechanical Properties (Bar – Solution Annealed) | Metric | Imperial |
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| Tensile Strength (min.) | 690 MPa | 100 ksi | | Yield Strength (0.2% offset, min.) | 310 MPa | 45 ksi | | Elongation (min.) | 45% | 45% | | Hardness (Rockwell C) | 95 HRB max. | 95 HRB max. |
Heat Treatment| Process | Temperature | Cooling | Purpose |
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| Solution Annealing | 1121-1182°C (2050-2160°F) | Water quench or rapid air cool | Dissolve carbides, optimize corrosion resistance |
*Note: Alloy C22 is typically supplied in the solution annealed condition and should not be used in the as-welded condition without solution annealing for critical corrosive service.*
Applications| Industry | Typical Applications |
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| Chemical Processing | Reactor vessels, heat exchangers, distillation columns, evaporators, transfer piping, valves | | Pollution Control | Flue gas desulfurization (FGD) scrubbers, stack liners, ducting, waste treatment equipment | | Pharmaceutical | Processing equipment requiring high purity and corrosion resistance | | Oil & Gas | Sour gas service components, downhole tools, wellhead equipment (NACE MR0175) | | Marine | Seawater handling systems, offshore platform equipment | | Waste Treatment | Incinerators, waste storage tanks, chemical waste processing |
Contact UsRequest a quote for 2.4602 / Alloy C22 (UNS N06022 / Hastelloy C-22) – Nickel-Chromium-Molybdenum Alloy – Exceptional Pitting & SCC Resistance – Balanced for Oxidizing & Reducing Media . Please provide: Diameter / size Product form (bar / forging / plate / tube) Length or weight required Quantity Destination port Any special certification requirements
📧 Email: daisy@zytcsteel.com
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