Hastelloy C-276, C-22, and B-2: Nickel-Molybdenum-Chromium & Nickel-Molybdenum Alloys
Hastelloy
Hastelloy nickel alloys hold up where stainless steels and even other nickel alloys corrode. We supply Hastelloy C-276 in sheet and strip for gasket fabrication in chemical processing, pharmaceutical, pollution control, and waste treatment applications where the media attacks most other metals.
At a Glance
Temperature Range
-200 °C to +1038 °C continuous oxidising (C-276; 675 °C is the TCP-phase embrittlement threshold for sustained load-bearing service)
Thickness Range
0.1 mm to 6 mm (strip and sheet)
Available Forms
Technical Properties
Typical values across stocked grades. Specific grade data sheets available on request.
Alloy Composition
Nickel (Ni)
Balance (~57%)
Molybdenum (Mo)
15.0–17.0% (C-276)
Chromium (Cr)
14.5–16.5% (C-276)
Tungsten (W)
3.0–4.5% (C-276)
Iron (Fe)
4.0–7.0% (C-276)
Carbon (C)
≤0.01% (C-276)
Physical Characteristics
Density
8.89 g/cm³ (C-276)
Tensile Strength
690–900 MPa (C-276 annealed; ASTM B575 minimum 690 MPa; typical ~790 MPa)
Elongation at Break
40–50% in 50 mm
Thermal Conductivity
11.2 W/m·K at 100 °C (C-276)
Chemical Resistance
Resistant To
- Sulphuric acid (most concentrations; consult corrosion data for hot concentrated H₂SO₄)
- Hydrochloric acid: dilute (≤10%) to ~50 °C; above 20% HCl limit to ~40 °C (C-276 specific)
- Phosphoric acid (all concentrations)
- Acetic and formic acid
- Wet chlorine gas and hypochlorite
- Ferric and cupric chloride solutions (pitting-resistant)
- Seawater and brine (superior to 316 and Monel)
- Flue gas condensates and scrubber liquors
Limited Resistance
- Concentrated oxidising acids at extreme temperature (use C-22 for improved resistance)
- Hydrofluoric acid above 50% concentration (Monel is preferred for HF service)
Not Recommended
- Molten metals, where dissolution occurs
- Fluorine gas at high temperature and pressure
- Sustained load-bearing service above 675 °C where TCP-phase embrittlement matters (short-term oxidation resistance to ~1038 °C is fine)
Standards & Certifications
Standards Compliance
Common Applications
- Chemical processing reactor and vessel gaskets (mixed acid service)
- Flue gas desulphurisation (FGD) equipment gaskets
- Pharmaceutical reactor seals (aggressive intermediates)
- Waste treatment and incineration equipment gaskets
- Pulp and paper bleach plant gaskets (chlorine dioxide service)
- Spiral wound gasket winding (corrosive media at elevated temperature)
- Acid recovery and regeneration plant seals
- Petrochemical sour gas service
Not Recommended For
- Very high material cost, typically 8–15× the price of 316 stainless steel. Specify only where chemical conditions demand it.
- Difficult to machine and fabricate, which work-hardens aggressively and requires experienced fabricators
- Long-term load-bearing service above 675 °C is limited by TCP-phase (topologically close-packed) embrittlement; short-term oxidation resistance extends to ~1038 °C. Specify load and time when working in this regime.
- B-2 grade is NOT resistant to oxidising acids or oxidising salts (ferric chloride, cupric chloride); it is formulated for reducing acid service only
- Longer procurement lead times than commodity alloys. Order well ahead of project requirements.
Available Grades
Hastelloy C-276 Sheet
The most widely used Hastelloy grade — resists both oxidising and reducing acids, chloride-induced pitting, and crevice corrosion. It is our standard recommendation for severe chemical service gaskets.
Hastelloy C-22 Sheet
Improved oxidising acid resistance over C-276 with better weldability. Used in mixed acid environments and FGD scrubber applications. Supplied on request.
Hastelloy B-2 Sheet
Nickel-molybdenum alloy optimised for reducing acids (especially hydrochloric acid). Not suitable for oxidising conditions. Supplied on request for specific reducing-acid applications.
Need Hastelloy?
We supply hastelloy in sheet, roll, and custom die-cut forms. Contact our team for pricing, data sheets, or technical assistance.
Disclaimer
This resource is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.