Metals & alloys · Nickel & cobalt alloys
HASTELLOY C-276-type alloy
A highly alloyed Ni–Cr–Mo–W corrosion-resistant material used in severe mixed chemical environments and aggressive pollution-control service.
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01
Overview
- Material class
- Metals & alloys
- Category
- Nickel & cobalt alloys
- Family
- Nickel-Chromium-Molybdenum Alloy
- Product forms
- Sheet/plate, Bar/rod
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Ni | Balance | |||
| Mo | 15 | 17 | 16 | |
| Cr | 14.5 | 16.5 | 15.5 | |
| Fe | 4 | 7 | 5.5 | |
| W | 3 | 4.5 | 3.75 | |
| Co | 2.5 | 1 | ||
| C | 0.01 | 0.005 |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | 8.89 | g/cm³ | Representative; verify product form and condition |
| Elastic modulus | 205 | GPa | Representative; verify product form and condition |
| Thermal conductivity | ~10 | W/m·K | Representative; verify product form and condition |
| Yield strength | ~283–410 | MPa | annealed product dependent |
| Tensile strength | ~690–790 | MPa | Representative; verify product form and condition |
| Corrosion range | broad | reducing/oxidizing mixtures |
Conditions
Representative supplied condition
Condition not fully specified in the source record.
03
Processing and use
Processing
- Low carbon and silicon improve weld corrosion resistance.
- Clean fabrication and avoidance of iron contamination are important.
Applications
- Reactors
- Scrubbers
- Heat exchangers
- Waste-treatment systems
Selection considerations
- Use corrosion testing for exact chemistry, temperature and crevice geometry.
- Cost and availability may favor clad construction.
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04
Standards and related materials
Standards and designations
| System | Designation | Note |
|---|---|---|
| UNS | N10276 | |
| W.Nr. | 2.4819 | |
| ASTM | B575 / B574 / B622 |
05
Sources and context
Sources
- Haynes C-276 alloy technical dataExisting reference
- U.S. Department of Energy critical materials programStrategic reference
- U.S. Nuclear Regulatory Commission materials resourcesApplication reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Specialty global supply, with welding consumables and plate availability usually better than large forgings.
High alloy value supports recycling; long corrosion life and cladding can reduce total material use.
Strategic context
Protects critical chemical and environmental infrastructure against environments that defeat common stainless steels.
Critical inputs: Nickel, Molybdenum, Tungsten, Cobalt
Basis: EU Critical Raw Materials Act (2024); USGS 2025 Critical Minerals List