Nickel Alloy Hastelloy C-22
UNS N06022 · EN 2.4602
Hastelloy C-22 (UNS N06022, 2.4602) is a Ni-Cr-Mo-W corrosion alloy that resists oxidising and reducing media over a broader range than C-276, and carries a corrosion rating of 95 in this library.
Reference datasheet — Hastelloy C-22 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
Hastelloy C-22 tempers and conditions
Hastelloy C-22 is supplied in 8 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cast equivalent (ASTM A494 CX-2MW), solution annealed | Cast pump casings, valve bodies and impellers where a wrought form is impractical; lower ductility and strength than wrought C-22. | 320 | 580 | 25 | 190 HB | 1.4 % IACS |
Hot forged plus solution annealed | Standard delivery condition for ASTM B564 forgings and B462 flanges; slightly lower strength than sheet, fully corrosion-optimised. | 370 | 760 | 55 | 183 HB | 1.5 % IACS |
Hot rolled, solution annealed and pickled plate | Heavy plate (>5 mm) for FGD absorbers, scrubbers and pressure vessels to ASTM B575. | 380 | 780 | 58 | 187 HB | 1.5 % IACS |
SADefault Solution annealed | Standard stocked condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility. | 395 | 800 | 60 | 195 HB | — |
Cold rolled, solution annealed sheet/strip | Thin sheet and strip for linings, bellows, gaskets and formed components needing best surface and formability. | 400 | 810 | 62 | 197 HB | 1.5 % IACS |
As-welded deposit | Matching filler deposit properties for weld joint design; used as-welded without post-weld heat treatment in most process service. | 500 | 760 | 40 | 185 HB | 1.5 % IACS |
Cold drawn | Pick when higher yield strength, close tolerance and better chip control are needed for fasteners, shafts and instrument tube. | 650 | 950 | 32 | 26 HRC | 1.5 % IACS |
Heavily cold worked / spring temper strip and wire | For springs, diaphragms, screens and wire needing maximum strength in corrosive service; very limited ductility. | 1,100 | 1,250 | 5 | 38 HRC | 1.5 % IACS |
What is Hastelloy C-22?
Hastelloy C-22 (UNS N06022, 2.4602) is a Ni-Cr-Mo-W corrosion alloy that resists oxidising and reducing media over a broader range than C-276, and carries a corrosion rating of 95 in this library. Annealed product gives 395 MPa yield, 800 MPa tensile, 60 % elongation and 195 HB (90 HRB) with service to 1000 °C, and is available as plate, sheet, pipe, bar, forgings and CX2MW castings for welded process equipment. Machinability is low (20) and cost per kilogram is high; C-276 is the cheaper choice where conditions are purely reducing. Hastelloy C-22 has a density of 8.69 g/cm³ (0.314 lb/in³), heavier than 72% of nickel alloy grades. It melts at 1,357°C (2,475 °F). Hastelloy C-22 has a yield strength of 395 MPa (57.3 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 52% of nickel alloy grades. Elongation at break is 60% and the elastic modulus is 206 GPa (29.9 Msi).
What is Hastelloy C-22 used for?
- FGD absorber components
- pharmaceutical reactors
- waste treatment systems
- acid production equipment
Advantages
- Ductile — tolerates forming and impact — 60%, better than 98% of nickel alloy grades
- Good corrosion resistance — 95/100, better than 97% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
- High service temperature — 1,000°C (1,832 °F), better than 79% of nickel alloy grades
- Forms and bends easily — 72/100, better than 77% of nickel alloy grades
Hastelloy C-22 properties
Typical room-temperature values for Hastelloy C-22-SA; bars are the position among nickel alloy grades.
Physical3
Hastelloy C-22 has a density of 8.69 g/cm³ (0.314 lb/in³), heavier than 72% of nickel alloy grades. It melts at 1,357°C (2,475 °F).
Mechanical14
Hastelloy C-22 has a yield strength of 395 MPa (57.3 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 52% of nickel alloy grades. Elongation at break is 60% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal5
Hastelloy C-22 is rated for continuous service to 1,000°C (1,832 °F). It conducts heat at 10.1 W/m·K (5.84 BTU/hr·ft·°F), worse than 84% of nickel alloy grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical3
Hastelloy C-22 conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (95/100), better than 97% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy C-22 takes about 145 MJ of energy and emits 12 kg of CO₂ — less than 77% of nickel alloy grades. Typical recycled content is 45%.
Manufacturability8
Hastelloy C-22's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability excellent (85/100); formability very good (72/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Hastelloy C-22 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy C-22
Is Hastelloy C-22 easy to machine?
Gummy and strongly work-hardening: use rigid setups, positive-rake carbide, low speed (~20–35 m/min) with heavy, constant feed, generous flood coolant and no dwelling to avoid glazing.
Can Hastelloy C-22 be welded?
Excellent weldability by GTAW/GMAW/SMAW with matching ERNiCrMo-10 filler; keep heat input and interpass temperature low, no preheat or PWHT required, avoid autogenous welds on heavy sections.
Can Hastelloy C-22 be formed, bent or molded?
Cold forms well but needs ~2× the force of 304 due to high work hardening; interstage solution anneal at 1100–1150 °C with rapid quench, hot work in 1150–1230 °C range and finish above ~950 °C.
Hastelloy C-22 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 20 – 22.5 | 21.5 |
| Mo | 12.5 – 14.5 | 13.5 |
| W | 2.5 – 3.5 | 3 |
| Fe | 2 – 6 | 3 |
| Co | ≤ 2.5 | 1 |
| V | ≤ 0.35 | |
| Mn | ≤ 0.5 | |
| Si | ≤ 0.08 | |
| C | ≤ 0.02 | |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| Nibalance, typically 55–59 % | balance |
What surface finishes work on Hastelloy C-22?
Not anodizable; pickle in HNO3-HF or grit-blast plus pickling to remove heat tint, then passivate/electropolish — full oxide removal is essential for design corrosion performance.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Hastelloy C-22 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06022
- EN / DIN / Werkstoff-Nr.
- 2.4602
How much does Hastelloy C-22 cost?
Hastelloy C-22 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Hastelloy C-22 — frequently asked
What is Hastelloy C-22 used for?
Hastelloy C-22 is typically used for FGD absorber components, pharmaceutical reactors, waste treatment systems and acid production equipment. In short: widest-range Hastelloy grade; handles oxidising and reducing acids; better than C-276 versatility.
What is the yield strength of Hastelloy C-22?
Hastelloy C-22 has a typical yield strength of 395 MPa (57.3 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 52% of nickel alloy grades. Strength varies by condition: see the 8 listed tempers.
Is Hastelloy C-22 easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Gummy and strongly work-hardening: use rigid setups, positive-rake carbide, low speed (~20–35 m/min) with heavy, constant feed, generous flood coolant and no dwelling to avoid glazing.
Can Hastelloy C-22 be welded?
Yes — weldability is rated excellent (85/100). Excellent weldability by GTAW/GMAW/SMAW with matching ERNiCrMo-10 filler; keep heat input and interpass temperature low, no preheat or PWHT required, avoid autogenous welds on heavy sections.
What surface finishes work on Hastelloy C-22?
Not anodizable; pickle in HNO3-HF or grit-blast plus pickling to remove heat tint, then passivate/electropolish — full oxide removal is essential for design corrosion performance.
Can Hastelloy C-22 be formed, bent or molded?
Cold forms well but needs ~2× the force of 304 due to high work hardening; interstage solution anneal at 1100–1150 °C with rapid quench, hot work in 1150–1230 °C range and finish above ~950 °C.
What is the maximum service temperature of Hastelloy C-22?
Hastelloy C-22 is rated for continuous use to about 1,000°C (1,832 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy C-22-SA and Hastelloy C-22 CW-Hard?
SA is the default condition — standard stocked condition for plate, sheet, bar, pipe and fittings; maximum corrosion resistance and ductility. CW-Hard: for springs, diaphragms, screens and wire needing maximum strength in corrosive service; very limited ductility. Yield strength is 395 MPa in SA versus 1,100 MPa in CW-Hard.
How much does Hastelloy C-22 cost?
Hastelloy C-22 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- HASTELLOY C-22 alloy technical data — Haynes International (2020)
- ASTM B575 — Ni-Cr-Mo alloy plate, sheet and strip (UNS N06022) — ASTM (2022)
- ASTM B574 / B622 / B564 — rod, bar, seamless pipe & tube, forgings (N06022) — ASTM (2021)
- ASTM A494 grade CX-2MW — nickel alloy castings — ASTM (2021)
- VdTÜV / DIN 17744 material 2.4602 (NiCr21Mo14W) — DIN/VdTÜV (2017)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys (Ni-Cr-Mo corrosion alloys) — ASM International (1990)
- VDM Alloy 22 material data sheet No. 4008 — VDM Metals (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.