hastelloy c22 vs hastelloy c276

Hastelloy C22 and C276 are both nickel-based alloys with excellent corrosion resistance. C22 contains more chromium, giving it better resistance to oxidizing chemicals and mixed acids.
C276 contains more molybdenum, making it especially effective in reducing acids, such as hydrochloric and sulfuric acid. Both alloys also resist pitting, crevice corrosion, and stress corrosion cracking.

Grade A

hastelloy c22

UNS: N06022
Family: Hastelloy / Nickel-Chromium-Molybdenum-Tungsten Alloy
Common Forms: Plate, sheet, pipe, tube, bar, flange

A highly corrosion-resistant nickel-chromium-molybdenum-tungsten alloy used in chemical processing, pharmaceutical equipment, waste treatment and environments containing both oxidizing and reducing media.

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Grade B

hastelloy c276

UNS: N10276
Family: Hastelloy / Nickel-Chromium-Molybdenum Alloy
Common Forms: Plate, sheet, pipe, tube, bar, flange

A versatile nickel-chromium-molybdenum alloy widely used in aggressive chemical processing, pollution control, acid equipment and mixed corrosive environments.

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Main Comparison

hastelloy c22 and hastelloy c276 comparison by engineering and purchasing factors

Review the key differences before confirming chemical media, product form, standard, certificate and delivery schedule.

Comparison Item	Hastelloy C276	Hastelloy C22	Selection Note
Basic Information
UNS Number	N10276	N06022	Useful for drawings, MTC review and purchase specifications.
Alloy Type	Nickel-chromium-molybdenum-tungsten alloy	Nickel-chromium-molybdenum-tungsten alloy	Both are corrosion-resistant nickel alloys for severe industrial service.
Typical Product Forms	Plate, sheet, pipe, tube, round bar, fittings, flanges	Plate, sheet, pipe, tube, round bar, wire, fittings	Availability depends on size, quantity, standard and delivery schedule.
Chemical Composition
Nickel (Ni)	Balance	Balance	Nickel base supports corrosion resistance and ductility.
Chromium (Cr)	Approx. 16%	Approx. 22%	C22 has higher chromium, helping oxidizing media resistance.
Molybdenum (Mo)	Approx. 16%	Approx. 13%	C276 has higher molybdenum, useful in many reducing environments.
Tungsten (W)	Approx. 4%	Approx. 3%	Tungsten contributes to localized corrosion resistance.
Carbon (C)	0.01 max	0.01 max	Low carbon supports weld heat-affected zone corrosion resistance.
Mechanical Properties
Yield Strength, RT	Approx. 365 MPa	Approx. 372 MPa	Typical annealed plate data; final values follow MTC and ordered standard.
Tensile Strength, RT	Approx. 785 MPa	Approx. 786 MPa	Both grades are close in common annealed plate conditions.
Elongation, RT	Approx. 59%	Approx. 62%	Both offer good ductility for fabrication and forming.
Weldability	Excellent with qualified procedure	Excellent with qualified procedure	Filler metal, heat input and corrosion test requirements should be confirmed.
Price Comparison
Relative Material Cost	High	High to higher	C22 can be higher in some sizes because of grade demand, availability and production schedule.
Stock Availability	Often stronger availability in common plate, pipe, bar and fitting sizes	Available in standard forms, but some sizes may need special production	C276 may be easier for urgent or small-batch procurement in common specifications.
Quotation Factors	Form, size, quantity, standard, MTC, testing and current nickel/molybdenum market	Form, size, quantity, standard, MTC, testing and current nickel/molybdenum market	Final price should be quoted by actual drawing, tolerance, certificate and delivery requirement.
Performance & Application
Corrosion Resistance	Broad resistance in severe mixed chemical environments	Excellent resistance in many oxidizing and chloride media	C276 is often broader; C22 is often preferred for oxidizing chloride risk.
Typical Applications	Acid equipment, FGD systems, chemical processing, pollution control	Wet chlorine, mixed acids, reactors, chloride-bearing chemical equipment	Select by actual medium, concentration, temperature and cleaning process.
Best Use Case	General severe corrosion service with wide product availability	Oxidizing chloride or wet chlorine service where pitting resistance is critical	Use corrosion data and project specification for final engineering selection.

Values are typical references for article comparison. Final supply should follow the ordered standard, product form, heat treatment, mill test certificate and project requirements.

Choose Choose hastelloy c22 when

Oxidizing chlorides, wet chlorine or pitting corrosion risk is the key issue.
The equipment may face mixed oxidizing acids or corrosion after fabrication.
You need strong corrosion performance in welded chemical processing equipment.

Choose hastelloy c276 when

Reducing acids, chloride-contaminated media or severe crevice corrosion is the key issue.
The equipment may face highly variable process conditions containing both oxidizing and reducing chemicals.
You need proven corrosion resistance in welded pollution control, chemical processing or sour gas equipment.

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