Nickel Alloy Alloy 22
UNS N06022 · EN 2.4602, NiCr21Mo14W · also Hastelloy C-22
Alloy 22 (N06022, 2.4602, NiCr21Mo14W) is a solution-annealed Ni-Cr-Mo-W corrosion alloy with broader resistance than C-276 across both oxidizing and reducing environments.
Reference datasheet — Alloy 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 ANN condition
Alloy 22 tempers and conditions
Alloy 22 is supplied in 6 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As cast | Cast counterpart for pump casings, valve bodies and impellers; lower strength and ductility than wrought, needs solution treatment for corrosion performance. | 320 | 620 | 28 | 200 HB | 1.5 % IACS |
Forged and solution annealed | For valve bodies, flanges and heavy fittings; properties essentially those of annealed plate with slightly lower ductility in thick sections. | 385 | 780 | 55 | 198 HB | 1.5 % IACS |
ANNDefault Annealed | Standard stocked condition for plate, sheet, pipe, tube and fittings; maximum corrosion resistance and ductility. | 400 | 800 | 62 | 88 HRB | — |
Hot-worked / hot-finished bar and billet | Hot-finished bar or billet supplied without final solution anneal; use where slightly higher strength is acceptable and machining stock is generous. | 400 | 790 | 55 | 12 HRC | 1.5 % IACS |
As-welded deposit | All-weld-metal condition for matching filler deposits and overlays; used as-welded with no PWHT required. | 480 | 760 | 40 | 210 HB | 1.5 % IACS |
Cold drawn | Pick for fasteners, springs, small-diameter tubing and shafts needing higher strength and tighter tolerances; ductility and formability reduced. | 800 | 1,000 | 25 | 30 HRC | — |
What is Alloy 22?
Alloy 22 (N06022, 2.4602, NiCr21Mo14W) is a solution-annealed Ni-Cr-Mo-W corrosion alloy with broader resistance than C-276 across both oxidizing and reducing environments. Engineers specify it for chemical process piping, reactors and scrubber hardware; it is available as plate, sheet, pipe, fittings, bar, forgings, welding consumables and castings at 400 MPa yield, 800 MPa tensile, 62 % elongation and 88 HRB annealed, with a corrosion score of 93. Limits are cost, machinability (15 of 100) and a practical ceiling near 675 °C; C-276 remains the pick for purely reducing acid service. Alloy 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). Alloy 22 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 62% and the elastic modulus is 206 GPa (29.9 Msi).
What is Alloy 22 used for?
- pharmaceutical reactors
- flue gas desulfurization
- waste treatment
- chemical piping
Advantages
- Ductile — tolerates forming and impact — 62%, better than 100% of nickel alloy grades
- Good corrosion resistance — 93/100, better than 95% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
Alloy 22 properties
Typical room-temperature values for Alloy 22-ANN; bars are the position among nickel alloy grades.
Physical3
Alloy 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).
Mechanical15
Alloy 22 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 62% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
Alloy 22 is rated for continuous service to 675°C (1,247 °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
Alloy 22 conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 95% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 22 takes about 145 MJ of energy and emits 12 kg of CO₂ — less than 77% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
Alloy 22's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability excellent (85/100); formability very good (70/100).
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. Alloy 22 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Alloy 22
Is Alloy 22 easy to machine?
Treat as a gummy, work-hardening nickel alloy: rigid setups, positive-rake sharp carbide, slow speeds with heavy feed, generous flood coolant and no dwelling to avoid glazing.
Can Alloy 22 be welded?
Very good weldability by GTAW/GMAW/SMAW with matching ERNiCrMo-10 filler, low heat input, stringer beads and interpass cooling below ~100 °C; no post-weld heat treatment needed for most service.
Can Alloy 22 be formed, bent or molded?
Cold forms well but work-hardens fast — allow ~2× the power of stainless, use intermediate anneals at 1120-1150 °C with rapid quench; hot work 950-1200 °C then solution anneal.
Alloy 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 |
| Mo | 12.5 – 14.5 | 13.5 |
| W | 2.5 – 3.5 | 3 |
| Fe | 2 – 6 | 4 |
| Co | ≤ 2.5 | 1 |
| Mn | ≤ 0.5 | |
| V | ≤ 0.35 | |
| Si | ≤ 0.08 | |
| C | ≤ 0.02 | |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| Nibalance, typically 55-59 % | balance |
What surface finishes work on Alloy 22?
Pickle or grind off heat tint and oxide before service (heat tint degrades corrosion resistance); electropolishing or mechanical polishing gives high-purity surfaces — anodizing not applicable.
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 Alloy 22 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06022
- EN / DIN / Werkstoff-Nr.
- 2.4602NiCr21Mo14W
- Trade names
- Hastelloy C-22
How much does Alloy 22 cost?
Alloy 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.
Alloy 22 — frequently asked
What is Alloy 22 used for?
Alloy 22 is typically used for pharmaceutical reactors, flue gas desulfurization, waste treatment and chemical piping. In short: widest-range corrosion nickel; handles oxidizing and reducing acids; very good weldability, poor machinability.
What is the yield strength of Alloy 22?
Alloy 22 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Alloy 22 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Treat as a gummy, work-hardening nickel alloy: rigid setups, positive-rake sharp carbide, slow speeds with heavy feed, generous flood coolant and no dwelling to avoid glazing.
Can Alloy 22 be welded?
Yes — weldability is rated excellent (85/100). Very good weldability by GTAW/GMAW/SMAW with matching ERNiCrMo-10 filler, low heat input, stringer beads and interpass cooling below ~100 °C; no post-weld heat treatment needed for most service.
What surface finishes work on Alloy 22?
Pickle or grind off heat tint and oxide before service (heat tint degrades corrosion resistance); electropolishing or mechanical polishing gives high-purity surfaces — anodizing not applicable.
Can Alloy 22 be formed, bent or molded?
Cold forms well but work-hardens fast — allow ~2× the power of stainless, use intermediate anneals at 1120-1150 °C with rapid quench; hot work 950-1200 °C then solution anneal.
What is the maximum service temperature of Alloy 22?
Alloy 22 is rated for continuous use to about 675°C (1,247 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Alloy 22-ANN and Alloy 22-CD?
ANN is the default condition — standard stocked condition for plate, sheet, pipe, tube and fittings; maximum corrosion resistance and ductility. CD: pick for fasteners, springs, small-diameter tubing and shafts needing higher strength and tighter tolerances; ductility and formability reduced. Yield strength is 400 MPa in ANN versus 800 MPa in CD.
How much does Alloy 22 cost?
Alloy 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
- ASTM B575 — Ni-Cr-Mo alloy plate, sheet and strip (UNS N06022) — ASTM International (2023)
- ASTM B574 / B564 / B622 / B619 — bar, forgings, seamless and welded pipe & tube — ASTM International (2023)
- ASTM A494 — Castings, Nickel and Nickel Alloy (grade CX2MW) — ASTM International (2020)
- HASTELLOY C-22 alloy principal features and physical properties — Haynes International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- AWS A5.14 / A5.11 — ERNiCrMo-10 and ENiCrMo-10 filler metals — AWS (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.