Hastelloy Alloys

Hastelloy C-22 (UNS N06022) — Composition, Properties & Supply

Hastelloy C-22 (UNS N06022) is one of the most oxidation-resistant grades in the Ni-Cr-Mo-W family with 20–22.5% chromium. It performs exceptionally in mixed oxidising/reducing acids, against localised corrosion and at elevated temperature, suiting processes where chemistry fluctuates.

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What is the chemical composition of Hastelloy C-22?

Hastelloy C-22 chemical composition, typical specification limits
Element	Symbol	Content (wt%)
Ni	Ni	Balance
Cr	Cr	20.0–22.5
Mo	Mo	12.5–14.5
W	W	2.5–3.5
Fe	Fe	2.0–6.0
Co	Co	≤ 2.50
V	V	≤ 0.35
C	C	≤ 0.015
Si	Si	≤ 0.08
Mn	Mn	≤ 0.50

Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.

What are the mechanical properties of Hastelloy C-22?

Hastelloy C-22 typical mechanical properties
Property	Value	Note
Tensile strength	≥ 690 MPa	Room temperature
Yield strength (0.2% offset)	≥ 310 MPa	Room temperature
Elongation	≥ 45 %	Gauge length 50 mm / 4D
Hardness	≤ 200 HB	Brinell / Rockwell

What are the physical properties of Hastelloy C-22?

Hastelloy C-22 physical properties
Property	Value
Density	8.69 g/cm³
Melting range	1357–1399 °C
Thermal conductivity	10.1 W/m·K
Elastic modulus	206 GPa
Maximum service temperature	1035 °C

What are the key characteristics of Hastelloy C-22?

Higher chromium than C-276 gives better oxidising and mixed-acid resistance
PREN around 65 — extremely high pitting and crevice resistance
Good thermal stability; resists harmful phase precipitation after welding or hot forming
Handles wet chlorine, chlorine dioxide and oxidising salt solutions

Where is Hastelloy C-22 used?

FGD systems and flue-gas scrubbers
Mixed acid (nitric/hydrofluoric) pickling lines
Nuclear waste treatment and fuel reprocessing
Agrochemical and fine-chemical reactors
Pharmaceutical equipment and clean piping

Which standards and specifications cover Hastelloy C-22?

What product forms are available?

Round BarsHastelloy C-22 supplied to specification with full traceability. Plates & SheetsHastelloy C-22 supplied to specification with full traceability. Seamless Tubes & PipesHastelloy C-22 supplied to specification with full traceability. Precision StripsHastelloy C-22 supplied to specification with full traceability. Welding Wire & CoilsHastelloy C-22 supplied to specification with full traceability. Forgings & RingsHastelloy C-22 supplied to specification with full traceability. Flanges & Pipe FittingsHastelloy C-22 supplied to specification with full traceability.

Frequently asked questions

Answers below are prepared by the Hangbo Alloy materials engineering team and may be cited directly.

What is the PREN of Hastelloy C-22?

Using PREN = %Cr + 3.3×(%Mo + 0.5×%W) + 16×%N with Cr 21%, Mo 13% and W 3% gives roughly 21 + 3.3×14.5 ≈ 69. With the simplified formula, engineering values land around 64–69 — comfortably above Inconel 625 (about 51) and comparable to or slightly above C-276.

Need Hastelloy C-22 bar, tube, plate or forgings?

Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.

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