Nickel Alloy Hastelloy C-22 HR-A
Finish state
UNS N06022 · EN 2.4602
HR-A = hot rolled, solution annealed and pickled plate
Heavy plate (>5 mm) for FGD absorbers, scrubbers and pressure vessels to ASTM B575.
Values for the HR-A condition
Other Hastelloy C-22 tempers and conditions
Hastelloy C-22 is listed in 8 conditions; see the grade overview at Hastelloy C-22.
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 |
HR-AThis page 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 HR-A?
Hastelloy C-22 HR-A is Hastelloy C-22 supplied in the HR-A condition — heavy plate (>5 mm) for FGD absorbers, scrubbers and pressure vessels to ASTM B575. Hastelloy C-22 HR-A has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 780 MPa (113 ksi) — weaker than 53% of nickel alloy grades. Elongation at break is 58% and the elastic modulus is 206 GPa (29.9 Msi). Hastelloy C-22 HR-A 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). SA is the default condition FabDigit quotes; HR-A is available on request or by drawing note.
Advantages
- Good corrosion resistance — 95/100, better than 97% of nickel alloy grades
- Ductile — tolerates forming and impact — 58%, better than 96% 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
Hastelloy C-22 HR-A properties
Typical room-temperature values for Hastelloy C-22 HR-A; 22 are specific to this condition. Other listed values are Hastelloy C-22 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Hastelloy C-22 HR-A 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 HR-A has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 780 MPa (113 ksi) — weaker than 53% of nickel alloy grades. Elongation at break is 58% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal5
Hastelloy C-22 HR-A 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 HR-A 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 HR-A 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 HR-A's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability excellent (85/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Hastelloy C-22 HR-A
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.
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.
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 | — |
Hastelloy C-22 HR-A — frequently asked
What is Hastelloy C-22 HR-A used for?
Hastelloy C-22 HR-A 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 HR-A?
Hastelloy C-22 HR-A has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 780 MPa (113 ksi) — weaker than 53% of nickel alloy grades. Strength varies by condition: see the 8 listed tempers.
Is Hastelloy C-22 HR-A 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 HR-A 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 HR-A?
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 HR-A 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 HR-A?
Hastelloy C-22 HR-A 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.