Hastelloy C-276
Fasteners & Material Data
UNS N10276
What is Hastelloy C-276 and its applications?
Hastelloy C-276 (UNS N10276) is a nickel-chromium-molybdenum alloy containing tungsten. It is used in chemical-process equipment for resistance to a range of reducing and oxidizing media, including chloride-bearing solutions.
- Chemical reactors: Vessels and columns handling compatible aggressive chemicals.
- Heat exchangers: Components selected against the specific process stream.
- Chloride-bearing process equipment: Parts requiring resistance to localized corrosion and environmental cracking.
Choose your C-276 product
Engineering Application & Selection Guide
Chromium and molybdenum support its corrosion resistance. Low carbon and silicon reduce concerns about detrimental precipitation during welding. Specify the thermal condition of the stock and finished part alongside the corrosion requirements.
- Hastelloy C-276 stud bolts — For acid-reactor joints, define process chemistry and finished-fastener mechanical requirements separately.
- Hastelloy C-276 hex bolts — For scrubber connections, review galvanic coupling, crevices and the lubrication method. Matching nominal alloys does not remove every corrosion mechanism.
- Hastelloy C-276 socket head cap screws — For compact fluid controls, specify surface condition, thread fit and whether the screw is wetted by process fluid.
Use the C-276 and C-22 comparison alongside corrosion data for the actual process chemistry. Acid concentration, temperature, oxidizing contaminants and shutdown conditions can change the selection. Neither alloy name establishes an allowable joint load.
Hastelloy C-276 Composition
Composition limits · wt.%
- Ni
- Balance
- Cr
- 14.5–16.5%
- Mo
- 15–17%
- Fe
- 4–7%
- W
- 3–4.5%
- Co
- ≤2.5%
- C
- ≤0.01%
- Mn
- ≤1.0%
- P
- ≤0.04%
- S
- ≤0.03%
- Si
- ≤0.08%
- V
- ≤0.35%
ASTM / ASME specifications by product form
Finished-product requirements
Specify the finished-fastener mechanical requirements, condition and inspection separately from the starting-stock specification.
Hastelloy C-276 hex bolt requirements ↗Fasteners · dimensional references
| Product | Reference |
|---|---|
| Hex bolts | ISO 4014 / ISO 4017 · ASME B18.2.1 |
| Threaded studs | DIN 976-1 · ASME B18.31.2 |
| Hex nuts | ISO 4032 · ASME B18.2.2 |
| Socket head screws | ISO 4762 · ASME B18.3 |
| Flat washers | ISO 7089 / ISO 7090 · ASME B18.21.1 |
| Custom fasteners | Customer drawing |
Raw-material specifications
| Product form / scope | Reference |
|---|---|
| Rod, bar & wire | ASTM B574 / ASME SB574 |
| Forgings & forging stock | ASTM B462 / B564 · ASME SB564 |
| Plate, sheet & strip | ASTM B575 / B906 · ASME SB575 / SB906 |
| Seamless pipe & tube | ASTM B622 / B829 · ASME SB622 / SB829 |
| Welded tube | ASTM B626 / B751 · ASME SB626 / SB751 |
| Welded pipe | ASTM B619 / B775 · ASME SB619 / SB775 |
| Fittings | ASTM B366 / ASME SB366 |
Dimensions do not define material or finished-part compliance. Specify the grade, condition and applicable requirements.
How to specify round bar, plate, wire and strip ↗Hastelloy C-276 Mechanical Properties
Reference sample and condition
- Data basis
- Published reference sample
- Test sample form
- Sheet · 2 mm thickness
- Sample size
- 0.078 in (2 mm) sheet
- Condition
- Mill annealed
- Test temperature
- Room temperature
- Heat treatment
- Mill-annealed wrought material context; no heat cycle is attached to this tensile row.
| Key properties | Value |
|---|---|
| Tensile strength | 792 MPa |
| 0.2% yield strength | 356 MPa |
| Elongation | 61% |
Hastelloy C-276 Physical Properties
| Property | Value | Unit |
|---|---|---|
| Density | 8.89 | g/cm³ |
| Melting range | 1325–1370 | °C |
Temperature curves and values
Tensile and yield strength
Annealed material · supplied reference
Approximate readings from the reference figure · not design allowables
Supplied technical reference · Scanned PDF page 11 · printed page 23Elongation vs temperature
Annealed material · supplied reference
Approximate readings from the reference figure · not design allowables
Supplied technical reference · Scanned PDF page 11 · printed page 23Procurement and application guide
Specify the material and final condition
Check the actual medium, concentration and temperature.
Material forms in the technical reference: Round bar · Flat bar · Wire · Plate · Sheet · Strip · Pipe & tube · Forging stock · Hexagon & sections.
Define the finished-part acceptance
Include the material or bolting specification, required final condition, dimensions and quantity. State the service medium, temperature and loading where known. Agree the required tests, inspection coverage and acceptance criteria for the finished part.
Start with the information you have
Send a drawing or share the product form and dimensions. Identify any undecided requirements for review rather than copying a typical property value into the purchase order.
Upload DrawingTechnical guides
All technical articles ↗
Nickel Alloy Fasteners: Selection and Specification Guide
Nickel-Alloy Fastener Galling
MTC vs PMI vs Inspection Report: Which One Actually Proves Your Fastener Meets the Order?Selection and specification · 3
Installation and inspection · 3
Quality documents
EN 10204 3.1 MTC
Material certification and heat-number traceability
Mechanical testing
Methods and acceptance criteria follow the agreed specification
Alloy 718 laboratory report · PDF ↗Thread inspection
Sampled GO/NO-GO gauging for threaded products
Additional inspection and records
Heat-treatment records, PMI and third-party scope agreed per order
View PMI sample ↗Specify your Hastelloy C-276 fastener
Sources and references
- Haynes · C-276 · Nominal Composition; Tensile Strength and Elongation; Resistance to Pitting and Crevice Corrosion ↗
- ASTM · B574 · B574-23 · public scope ↗
- Special Metals · C-276 · Technical bulletin · product forms and specifications ↗
- Supplied technical reference · Scanned PDF page 11 · printed page 23
- Supplied technical reference · Scanned PDF page 6 · printed page 18
Additional published references
- DIN 17744 / 17750–17754; ISO 6207 / 6208 / 9723 / 9724; ISO 9725; VdTÜV 400; NACE MR0175 / ISO 15156 Special Metals · C-276 · Technical bulletin · product forms and specifications ↗
- ASME Code Case 1924; NACE MR0175 / ISO 15156 Supplied technical reference · Scanned PDF page 11 · printed page 23