USA Piping Solution is a Hastelloy C276 tubing supplier in the USA, stocking UNS N10276 material to ASTM B622 for seamless tube and ASTM B619 for welded tube, with B626 and B775 forms available on request. C276 is a nickel-molybdenum-chromium alloy built for the environments that break simpler alloys: chloride pitting, crevice corrosion, and mixed oxidizing and reducing acids. We supply it in seamless, welded, and ERW form, every heat certified to EN 10204 3.1. For the wider Hastelloy range, see our Hastelloy Pipes & Tubes page, and for the full nickel alloy family, browse Nickel Alloy Pipes & Tubes.
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What Is Hastelloy C276 Tube?
Hastelloy C276 is a solid-solution nickel-based alloy with high molybdenum and chromium content, engineered for resistance to pitting, crevice corrosion, and stress corrosion cracking across a wide range of aggressive chemical environments. It carries the DIN designation 2.4819 in European markets and is sold internationally as Alloy C276. Trade names for the same UNS N10276 chemistry include NickelVac C-276, Nicrofer 5716, Boehler L276, and UNITEMP HN; when sourcing against a trade name, confirm the UNS number and ASTM standard directly rather than relying on the name alone.
Specifications
| Specification | Details |
|---|---|
| Material Grade | Hastelloy C276 |
| UNS Number | N10276 |
| DIN Werkstoff No. | 2.4819 |
| Standards | ASTM B622 / ASME SB622 (seamless) - ASTM B619 / ASME SB619 (welded) - ASTM B626 (welded) - ASTM B775 - ISO 6207 - DIN 17751 |
| Types | Seamless, ERW, Welded |
| OD | 4 - 22 mm |
| Thickness | 0.15 - 1.5 mm |
| Length | Random or cut |
| Ends | Plain or beveled |
All C276 tubes are supplied with appropriate heat treatment, dimensional inspection, and full material traceability to ASTM and ASME requirements.
Chemical Composition
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 14.5 - 16.5 |
| Molybdenum (Mo) | 15 - 17 |
| Iron (Fe) | 4 - 7 |
| Tungsten (W) | 3 - 4.5 |
| Cobalt (Co) | 2.5 max |
| Carbon (C) | 0.01 max |
| Silicon (Si) | 0.08 max |
| Manganese (Mn) | 1.0 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Vanadium (V) | 0.35 max |
The high molybdenum and chromium content is what carries C276's resistance to localized corrosion in aggressive chemical environments. Source: ASTM B622 / Haynes International datasheet.
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 690 MPa |
| Yield Strength (0.2% Offset) | 283 MPa |
| Elongation | 40% min |
| Hardness | <100 HRB |
| Density | 8.89 g/cm3 |
| Melting Range | 1323 - 1371 deg C (2415 - 2500 deg F) |
| Elastic Modulus | 205 GPa |
| Thermal Expansion (20-100 deg C) | 11.2 x 10^-6/deg C |
These properties remain stable across a wide temperature range, including cryogenic and elevated-temperature conditions.
Weight Chart (kg/m)
Approximate weights for common Hastelloy C276 tube sizes. Actual weight can vary slightly with mill tolerance; contact us for exact figures on project quantities.
| OD (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|
| 6 | 1.0 | 0.133 |
| 8 | 1.0 | 0.185 |
| 10 | 1.0 | 0.237 |
| 12 | 1.5 | 0.416 |
| 16 | 1.5 | 0.572 |
| 19 | 2.0 | 0.906 |
| 22 | 2.0 | 1.065 |
| 25 | 2.5 | 1.500 |
| 32 | 2.0 | 1.599 |
| 50 | 3.0 | 3.558 |
Pressure Ratings (MAWP)
Maximum allowable working pressure for common tube sizes at 20 deg C and 300 deg C, calculated per ASME B31.3 using allowable stress for UNS N10276. Always verify with your engineering team for specific design conditions.
| OD (mm) | Wall (mm) | MAWP at 20 deg C (bar) | MAWP at 300 deg C (bar) |
|---|---|---|---|
| 6 | 1.0 | 380 | 310 |
| 10 | 1.5 | 330 | 270 |
| 16 | 2.0 | 275 | 225 |
| 22 | 2.0 | 197 | 160 |
| 38 | 2.5 | 142 | 116 |
| 50 | 3.0 | 130 | 106 |
Why Hastelloy C276 Is Preferred in Corrosive Environments
- Outstanding resistance to pitting and crevice corrosion
- Excellent performance in chloride-rich environments
- Resistance to sulfuric, hydrochloric, and phosphoric acids
- Stable across both oxidizing and reducing conditions
- High resistance to stress corrosion cracking
C276 is not recommended for continuous service above 677 deg C (1250 deg F). Above that threshold the alloy can enter a secondary phase that reduces corrosion resistance.
Types of Hastelloy C276 Tube We Supply
Seamless Tube
the standard form for pressure and process piping.
Welded Tube
cost-effective alternative for larger sizes and non-critical service.
Round Tube
standard profile for general engineering use.
U-Bend Tube
pre-formed for heat exchanger bundles.
Instrumentation Tube
small-bore tube for control and sensing lines.
Capillary Tube
tight-tolerance small-bore tube for specialty applications.
Applications
- Chemical Processing: heat exchangers, acid handling, and transfer systems in aggressive chemical service.
- Oil & Gas: production and refining equipment exposed to sour and corrosive media.
- Flue Gas Desulfurization: ductwork and scrubber liners, widely used in US power utility FGD systems.
- Pollution Control & Waste Treatment: systems handling corrosive byproducts and high-temperature incineration.
- Pulp & Paper: bleach plant equipment exposed to chlorine-based chemistry.
- Marine & Offshore: seawater heat exchangers and offshore platform piping.
- Nuclear & Chlorine Production: fuel reprocessing components and chlorine handling equipment.
Have a Drawing or Datasheet? Send It Over
Hastelloy C276 vs Other Nickel Alloys
C276 offers a balanced combination of corrosion resistance and fabrication ease compared to other nickel alloys:
| Comparison | Key Distinction |
|---|---|
| C276 vs Inconel 625 | C276 provides better resistance to reducing acids; Inconel 625 excels in high-temperature strength. |
| C276 vs Monel 400 | C276 outperforms Monel 400 in chloride and mixed acid environments. |
| C276 vs Hastelloy C22 | C22 offers slightly better resistance to oxidizing media; C276 is more versatile across mixed corrosive conditions. |
| C276 vs Hastelloy C4 (UNS N06455) | C4 offers improved thermal stability above 500 deg C due to reduced carbon and silicon content; C276 provides broader corrosion resistance across mixed acid and chloride environments at moderate temperatures. |
See our Inconel 625 Pipes & Tubes and Monel 400 Pipes & Tubes pages for the full spec on those alloys.
Welding & Fabrication
Hastelloy C276 tubing is weldable by TIG (GTAW), MIG (GMAW), and SMAW processes. The recommended filler wire is AWS A5.14 ERNiCrMo-4 (Alloy C276 filler). Excessive heat input should be avoided to minimize grain growth in the heat-affected zone. Post-weld solution annealing is not required in most cases: the low carbon content (max 0.01%) prevents sensitization at welding temperatures. Tubes intended for welded assemblies are available in pickled and annealed condition.
Testing, Certification & Availability
Every order is supplied with an EN 10204 3.1 mill test certificate as standard, heat number traceable to ASTM B622 / B619, with 3.2 third-party witnessed certification available on request. Dimensional inspection is performed per ASTM B622 to an OD tolerance of +/-0.10 mm and wall thickness tolerance of +/-10%, with reports available on request. C276 tube is also compliant with NACE MR0175 / ISO 15156 for sour service (H2S environment) applications. USA Piping Solution operates under ISO 9001:2015 and PED 2014/68/EU capability for EU project requirements; see our Quality Policy page for the full program. Standard stock sizes ship within 7-14 working days; custom or fabricated dimensions within 4-6 weeks. International shipment is available on request.