Nickel Alloy Alloy 22-HF
Grade
UNS N06022 · EN 2.4602, NiCr21Mo14W · also Hastelloy C-22
HF = 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.
Values for the HF condition
Other Alloy 22 tempers and conditions
Alloy 22 is listed in 6 conditions; see the grade overview at Alloy 22.
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 | — |
HFThis page 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-HF?
Alloy 22-HF is Alloy 22 in the HF grade — hot-finished bar or billet supplied without final solution anneal; use where slightly higher strength is acceptable and machining stock is generous. Alloy 22-HF has a yield strength of 400 MPa (58 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 55% and the elastic modulus is 206 GPa (29.9 Msi). Alloy 22-HF 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). ANN is the default condition FabDigit quotes; HF is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 55%, better than 93% of nickel alloy grades
- Good corrosion resistance — 90/100, better than 85% of nickel alloy grades
- Readily welded — 84/100, better than 77% of nickel alloy grades
Alloy 22-HF properties
Typical room-temperature values for Alloy 22-HF; 23 are specific to this condition. Other listed values are Alloy 22 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Alloy 22-HF 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-HF has a yield strength of 400 MPa (58 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 55% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
Alloy 22-HF 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-HF conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), better than 85% of nickel alloy grades.
Sustainability4
Producing a kilogram of Alloy 22-HF 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-HF's machinability is poor (16/100, worse than 71% of nickel alloy grades); weldability very good (84/100); formability good (62/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 22-HF
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.
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.
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 | — |
Alloy 22-HF — frequently asked
What is Alloy 22-HF used for?
Alloy 22-HF 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-HF?
Alloy 22-HF has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Alloy 22-HF easy to machine?
Not especially — machinability is rated poor (16/100, worse than 71% 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-HF be welded?
Yes — weldability is rated very good (84/100). 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-HF?
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-HF 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-HF?
Alloy 22-HF 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.