UNS N10276|2.4819|Hastelloy C276 Seamless Pipe
Featuring an extra-low carbon and silicon content, our C276 pipes minimize carbide precipitation in the weld heat-affected zone, maintaining superior corrosion resistance in the as-welded condition. These pipes are indispensable for handling wet chlorine gas, hypochlorite, and chlorine dioxide, making them the top choice for pollution control, flue gas desulfurization (FGD), and marine engineering. Available in various sizes including SCH 10 and SCH 40, and offered with a precision-polished finish, XinZhe ensures every pipe delivers maximum durability for critical heat exchangers and aggressive chemical processing.
What Is Seamless Hastelloy C276 Pipe?
ASeamless Hastelloy C276 Pipe (UNS N10276 / W.Nr. 2.4819) is a high-performance nickel-molybdenum-chromium superalloy pipe designed for use in extremely aggressive chemical environments. The pipe is manufactured from a single solid billet using seamless forming processes, eliminating longitudinal weld seams for superior mechanical integrity, higher pressure resistance and enhanced corrosion reliability.
The optimized Ni-Mo-Cr-W chemistry enables outstanding resistance to a wide variety of oxidizing and reducing environments, including ferric and cupric chlorides, contaminated organic and inorganic media, chlorine gas and chlorine compounds, formic and acetic acids, and seawater and brine solutions.
Seamless Hastelloy C276 pipes are typically manufactured according to ASTM B622 (seamless) / ASTM B619 (welded) and ASME SB622 / SB619, and are widely used in chemical processing, pollution control, offshore engineering and high-corrosion industrial systems.
Key Features of Seamless Hastelloy C276 Pipes
Exceptional Corrosion Resistance
outstanding resistance to pitting, crevice corrosion and chloride-induced SCC — one of the most reliable materials for highly corrosive chemical process environments.
Resistance to Strong Oxidizing Media
one of the few alloys capable of resisting wet chlorine gas, hypochlorite solutions and chlorine dioxide, making it particularly suitable for bleaching and chemical oxidation processes.
High Temperature Strength
stable mechanical properties from cryogenic temperatures up to approximately 816°C (1500°F).
Low Carbon Content for Improved Weldability
ultra-low carbon minimizes carbide precipitation during welding, ensuring excellent corrosion resistance in the heat-affected zone (HAZ).
Versatile Corrosion Performance
reliable in both oxidizing and reducing environments — a highly versatile alloy for multi-process chemical plants.
Product Specifications and Data
Chemical Composition
The composition of Hastelloy C276 is carefully balanced to achieve its superior corrosion resistance and high strength.
| Grade | Ni | Cr | Mo | Fe | W | C | Si | Co | Mn | V | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N10276 | Balance | 14.50–16.50 | 15.00–17.00 | 4.00–7.00 | 3.00–4.50 | ≤ 0.01 | ≤ 0.08 | ≤ 2.50 | ≤ 1.00 | ≤ 0.35 | ≤ 0.04 | ≤ 0.03 |
Typical Mechanical Properties
Hastelloy C276 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 690 MPa | ≥ 283 MPa | ≥ 40% | ≤ 100 HRB |
Typical Physical Properties
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 8.89 g/cm³ | 1325–1370 ℃ | 11.2 µm/m·℃ | 10.2 W/m·K | 205 GPa | 1.30 µΩ·m |
Hastelloy C276 vs Hastelloy C22 — Material Comparison
| Property | Hastelloy C276 (UNS N10276) | Hastelloy C22 (UNS N06022) |
|---|---|---|
| Alloy Type | Ni-Mo-Cr-W nickel alloy | Ni-Cr-Mo-W nickel alloy |
| Chromium (Cr) | 14.5–16.5% | 20.0–22.5% |
| Molybdenum (Mo) | 15.0–17.0% | 12.5–14.5% |
| Tungsten (W) | 3.0–4.5% | 2.5–3.5% |
| Corrosion Resistance | Excellent in reducing environments | Superior in oxidizing environments |
| Pitting & Crevice Resistance | Very high | Extremely high |
| Chloride SCC Resistance | Excellent | Excellent |
| Oxidizing Chemical Resistance | Good | Outstanding |
| Fabrication & Weldability | Very good | Excellent |
| Typical Standards | ASTM B622 / B619 | ASTM B622 / B619 |
| Typical Applications | Chemical processing, FGD systems, sour gas | Chlorine processes, pharmaceuticals, specialty chemicals |
Key difference: C22 contains higher chromium (≈20–22%) than C276, giving it better resistance to oxidizing chemicals, while C276’s higher molybdenum provides the edge in strongly reducing media.
Industrial Applications of Seamless Hastelloy C276 Pipes
Chemical Processing Industry
- Reactor vessels
- Digesters
- High-acid process piping
Pollution Control Systems
- Flue Gas Desulfurization (FGD) units
- Chemical scrubbers
- Stack liners
Pulp and Paper Industry
- Bleach plant equipment
- Chlorine dioxide processing systems
Waste Treatment and Environmental Systems
- Hazardous waste incineration equipment
- Evaporators and corrosive waste piping
Oil and Gas Industry
- Sour gas (H₂S) processing equipment
- Downhole tubing and subsea components
Quality Control and Inspection
Material Certification: EN 10204 3.1 / 3.2 Material Test Certificates (MTC).
Non-Destructive Testing: Ultrasonic Testing (UT), Eddy Current Testing (ET) and hydrostatic pressure testing.
Surface and Dimensional Inspection: surface roughness verification and dimensional tolerance inspection.
Advanced Material Testing: grain size analysis, pitting corrosion testing according to ASTM G48 and 100% PMI.
Frequently Asked Questions About Hastelloy C276 Pipe
What is Hastelloy C276 pipe used for?
C276 seamless pipe serves chemical reactors, FGD scrubbers, bleach plant equipment, hazardous waste incinerators, and sour gas processing in oil and gas service.
What standards apply to Hastelloy C276 seamless pipe?
Seamless pipe to ASTM B622 / ASME SB622; welded product to ASTM B619 / ASME SB619.
How does C276 differ from C22?
C22 has higher chromium for superior oxidizing-media resistance; C276 has higher molybdenum plus tungsten for the strongest performance in reducing media. Both are produced to ASTM B622.
Is Hastelloy C276 suitable for seawater service?
Yes. It resists pitting, crevice corrosion and chloride SCC in seawater and brine, though design should confirm temperature, flow and crevice conditions.
What inspection and certification are available?
EN 10204 3.1/3.2 MTCs, UT/ET and hydrostatic testing, dimensional and surface inspection, grain size analysis, ASTM G48 pitting tests and 100% PMI.
Ready to Request a Quotation?
Send your Hastelloy C276 pipe enquiry with grade, ASTM B622 and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
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