Nickel Alloy C-276 | UNS N10276 | 2.4819 | Hastelloy C-276

Nickel Alloy C-276 | UNS N10276 | 2.4819 | Hastelloy C-276

Shaanxi Shangyou Stainless Steel Co., Ltd. supplies Nickel Alloy C-276, also known as Hastelloy C-276, identified as UNS N10276 and Werkstoff 2.4819 (EN material symbol NiMo16Cr15W), in plate, sheet, strip, round bar, rod, seamless and welded tubing, pipe, and forging forms. Our Alloy C-276 products can be supplied according to ASTM B575 / ASME SB-575 for plate, sheet and strip; ASTM B574 / ASME SB-574 for bar products; ASTM B622 / ASME SB-622 for seamless tubing and pipe; ASTM B619 / ASME SB-619 for welded pipe; ASTM B626 / ASME SB-626 for welded tubing; and ASTM B564 for forgings.

Nickel Alloy C-276 is among the most corrosion-resistant alloys currently available and is widely used in the severest environments encountered in chemical and petrochemical processing, flue gas desulfurization, pulp and paper production, industrial and municipal waste treatment, and sour oil and gas recovery. The alloy offers outstanding resistance to a wide variety of chemical process environments including ferric and cupric chlorides, hot contaminated mineral acids, solvents, chlorine and chlorine-contaminated media, formic and acetic acids, acetic anhydride, seawater and brine solutions, and hypochlorite and chlorine dioxide solutions. One of the few alloys resistant to wet chlorine gas, hypochlorite, and chlorine dioxide solutions.

Actual properties depend on product form, dimensions, heat-treatment cycle, and the specified ASTM, ASME or AMS standard.

Solution Annealed

Alloy C-276 is normally supplied in the solution-annealed condition. The standard solution annealing treatment is performed at approximately 1,120°C (2,048°F) followed by rapid water quenching. This treatment dissolves any precipitates and ensures maximum corrosion resistance. The low carbon content (0.02% max) minimizes carbide precipitation during welding, making the alloy suitable for most chemical process applications in the as-welded condition without the need for post-weld heat treatment.

Cold Working

Unlike age-hardenable alloys, Alloy C-276 is hardened only by cold working. Annealed material typically exhibits tensile strength of 120 – 160 ksi (830 – 1,100 MPa), while spring temper can achieve 200 – 240 ksi (1,380 – 1,655 MPa).

Alloy C-276 is regarded as the most versatile corrosion-resistant alloy available, with outstanding resistance to a wide variety of chemical process environments.

Key Corrosion Characteristics:

• Excellent resistance to pitting and crevice corrosion due to high molybdenum (15-17%) and tungsten (3-4.5%) content.
• Resists stress-corrosion cracking (SCC) in chloride environments.
• Resists both oxidizing and reducing media through the combined action of chromium (oxidizing resistance) and molybdenum/tungsten (reducing resistance).
• Resistant to wet chlorine gas, hypochlorite, and chlorine dioxide solutions.
• Exceptional resistance to ferric and cupric chlorides.
• Excellent resistance to sulfuric acid, hydrochloric acid (dilute), phosphoric acid (impure), and acetic/formic acids.
• Low carbon content minimizes grain boundary precipitation in the weld heat-affected zone, preserving corrosion resistance in as-welded structures.
• Not prone to intergranular corrosion after welding.

Selection Considerations:

• One of the few alloys suitable for wet chlorine gas service.
• Recommended when no single corrosion mechanism dominates and the process fluid combines multiple aggressive species.
• For applications requiring even higher resistance to oxidizing conditions, Alloy C-22 may be preferred.
• For pure reducing acid service (HCl, H₂SO₄), Alloy B-3 offers superior performance.

• Chemical Processing: Reactor vessels, heat exchangers, evaporators, distillation columns, and piping for mixed-acid and chloride-containing environments.
• Flue Gas Desulfurization (FGD): Scrubber internals, outlet ducts, dampers, reheaters, fans and fan housings.
• Pulp and Paper: Digesters, bleach plants, and equipment in high-chemical-stress processes.
• Pharmaceutical: High-purity reactor piping and equipment using aggressive cleaning chemicals.
• Waste Treatment: Incinerator off-gas scrubbing systems, hazardous waste handling.
• Oil and Gas: Sour gas wellhead components, pipeline cladding in highly corrosive production environments.
• Pollution Control: Stack liners, ducting, and scrubber systems.

Available quality-control services include:

• Heat-number traceability
• Chemical composition verification
• Tensile, yield and elongation testing
• Hardness inspection
• Dimensional and surface inspection
• Positive Material Identification (PMI)
• Ultrasonic testing
• Dye penetrant inspection
• Heat-treatment records
• EN 10204 3.1 material certificate

For an accurate quotation, please provide:

Alloy Grade · Standard · Product Form · Dimensions · Quantity · Heat Treatment · Inspection Requirement · Application · Working Temperature · Destination Port

For corrosive or sour-service projects, also provide:

Chemical Medium · Concentration · Pressure · Chloride Content · H₂S Conditions · Oxidizing or Reducing Environment

Procurement Actions

• Request Nickel Alloy C-276 Quote
• Upload Drawing or MTO
• Check Available Stock
• Ask for Alloy Selection Support

1. What is Nickel Alloy C-276?

Nickel Alloy C-276 (UNS N10276), also known as Hastelloy C-276, is a nickel-molybdenum-chromium-tungsten superalloy offering exceptional corrosion resistance in aggressive chemical environments, including resistance to pitting, crevice corrosion, and stress-corrosion cracking.

2. What are the UNS and EN numbers for Alloy C-276?

The UNS designation is N10276; the European Werkstoff number is 2.4819; the EN material symbol is NiMo16Cr15W.

3. Which standards apply to Alloy C-276 plate and bar?

ASTM B575 / ASME SB-575 applies to plate, sheet and strip; ASTM B574 / ASME SB-574 applies to bar, rod and wire.

4. Which standards apply to Alloy C-276 tubing and pipe?

ASTM B622 / ASME SB-622 for seamless tubing and pipe; ASTM B619 / ASME SB-619 for welded pipe; ASTM B626 / ASME SB-626 for welded tubing.

5. Is Alloy C-276 corrosion-resistant in the welded condition?

Yes. The low carbon content (0.02% max) minimizes carbide precipitation in the weld heat-affected zone, making it suitable for most chemical process applications in the as-welded condition without post-weld heat treatment.

6. What environments does Alloy C-276 resist?

It resists wet chlorine gas, ferric/cupric chlorides, sulfuric acid, hydrochloric acid (dilute), phosphoric acid, formic/acetic acids, seawater, brine, and hypochlorite solutions. It is one of the few alloys resistant to wet chlorine gas and chlorine dioxide.

7. Is Alloy C-276 resistant to chloride stress-corrosion cracking?

Yes. Alloy C-276 has excellent resistance to chloride stress-corrosion cracking and is considered immune to SCC in most chloride environments.

8. What is the difference between Alloy C-276 and Alloy C-22?

Both are nickel-chromium-molybdenum alloys. Alloy C-276 has higher molybdenum (15-17%) and tungsten (3-4.5%), making it the most versatile for general aggressive service. Alloy C-22 has higher chromium (22%) and is preferred when oxidizing conditions dominate.

9. Can Alloy C-276 be age-hardened?

No. Alloy C-276 is not age-hardenable. Strength increases only through cold working. Annealed material tensile strength is ~690 MPa, while spring temper reaches up to 1,655 MPa.

10. What information is required for a quotation?

Please provide the standard, product form, dimensions, quantity, heat-treatment condition, inspection requirements, application, working temperature, and destination port. For corrosive service, also specify chemical medium, concentration, temperature, and chloride content.