Product Overview
Hastelloy C-276 is the most versatile corrosion-resistant alloy available today . Its extremely low carbon and silicon content provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive environments. The alloy exhibits exceptional resistance to wet chlorine gas, hypochlorite, chlorine dioxide, and oxidizing chlorides . It performs reliably in sulfuric, hydrochloric, and phosphoric acids across a wide temperature range. Unlike many other corrosion-resistant alloys, Hastelloy C-276 maintains its corrosion resistance even in the welded condition, making it ideal for critical chemical processing equipment where welded fabrication is required . The alloy contains tungsten (3.0-4.5%) which provides additional resistance to localized corrosion and enhances overall performance in severe environments .
Key characteristics include:
- Universal corrosion resistance in a wide range of aggressive media
- Outstanding resistance to pitting and crevice corrosion
- Excellent resistance to stress corrosion cracking
- Superior resistance to wet chlorine gas and oxidizing chlorides
- Resistance to sulfuric, hydrochloric, and phosphoric acids
- Maintains corrosion resistance in the welded condition
- Low carbon and silicon content for enhanced stability
Chemical Composition
| Element | Content (%) | Role |
| Nickel (Ni) | Balance | Base element, provides corrosion resistance |
| Chromium (Cr) | 14.5 – 16.5 | Oxidation resistance, provides corrosion resistance in oxidizing environments |
| Molybdenum (Mo) | 15.0 – 17.0 | Primary pitting and crevice corrosion resistance, acid resistance |
| Tungsten (W) | 3.0 – 4.5 | Enhanced localized corrosion resistance, acid resistance |
| Iron (Fe) | 4.0 – 7.0 | Structural element, cost reduction |
| Cobalt (Co) | ≤ 2.5 | Residual element, controlled for nuclear applications |
| Carbon (C) | ≤ 0.010 | Ultra-low carbon prevents sensitization and maintains corrosion resistance |
| Silicon (Si) | ≤ 0.08 | Deoxidizer, ultra-low for corrosion resistance |
| Manganese (Mn) | ≤ 1.0 | Deoxidizer |
| Vanadium (V) | ≤ 0.35 | Grain refinement |
| Phosphorus (P) | ≤ 0.030 | Impurity, tightly controlled |
| Sulfur (S) | ≤ 0.030 | Impurity, tightly controlled |
Mechanical Properties
Room Temperature Properties (Annealed)
| Property | ASTM Requirement | Typical Achieved |
| Tensile Strength | ≥ 690 MPa (100 ksi) | 690 – 860 MPa |
| Yield Strength (0.2% Offset) | ≥ 283 MPa (41 ksi) | 283 – 350 MPa |
| Elongation | ≥ 40% | 40 – 55% |
| Hardness | ≤ 100 HRB | 85 – 95 HRB |
| Density | 8.89 g/cm³ | |
| Melting Range | 1325 – 1370°C | |
| Thermal Conductivity at 20°C | 10.2 W/m·K | |
| Coefficient of Thermal Expansion (20-100°C) | 11.0 × 10⁻⁶/°C | |
| Elastic Modulus | 208 GPa | |
| Magnetic Permeability | Non-magnetic |
High-Temperature Mechanical Properties
| Temperature °C | Tensile Strength (MPa) | Yield Strength (MPa) |
| 20 | 690 – 860 | 283 – 350 |
| 100 | 645 | 260 |
| 200 | 610 | 240 |
| 300 | 580 | 220 |
| 400 | 540 | 210 |
| 500 | 500 | 200 |
| 600 | 460 | 190 |
Key Advantages of Hastelloy C-276
Universal Corrosion Resistance – Hastelloy C-276 is recognized as the most versatile corrosion-resistant alloy available today . It provides excellent resistance to both oxidizing and reducing acids, making it suitable for applications where the process stream may vary between oxidizing and reducing conditions. The alloy performs reliably in sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, and various organic acids .
Outstanding Pitting and Crevice Corrosion Resistance – The high molybdenum content (15-17%) provides exceptional resistance to pitting and crevice corrosion in chloride-containing environments . The alloy is virtually immune to pitting corrosion in seawater and other aggressive chloride media. Its resistance to pitting is significantly superior to 316L stainless steel and most other nickel-based alloys.
Excellent Stress Corrosion Cracking Resistance – Hastelloy C-276 exhibits outstanding resistance to chloride-induced stress corrosion cracking. The alloy is essentially immune to SCC in chloride environments where austenitic stainless steels are subject to failure . This makes it suitable for critical applications in marine, chemical, and petrochemical industries.
Weldability and Corrosion Resistance After Welding – Unlike many corrosion-resistant alloys, Hastelloy C-276 maintains its corrosion resistance in the welded condition . The alloy does not require post-weld heat treatment to restore corrosion resistance. Its resistance to weld decay makes it ideal for complex fabricated equipment in the chemical processing and petrochemical industries.
Resistance to Wet Chlorine Gas – Hastelloy C-276 exhibits exceptional resistance to wet chlorine gas, hypochlorite, chlorine dioxide, and oxidizing chlorides . The alloy is widely used in processes involving chlorine and chlorine-containing compounds where most other materials would fail rapidly.
Resistance to Sulfur and Phosphoric Acids – The alloy demonstrates excellent resistance to sulfuric acid across a wide concentration range at moderate temperatures. It is also resistant to phosphoric acid, making it suitable for phosphate fertilizer production and other phosphoric acid services .
Good High-Temperature Strength – Hastelloy C-276 maintains useful mechanical properties at elevated temperatures. The alloy retains its corrosion resistance and structural integrity in high-temperature aggressive environments, with good creep resistance up to 400°C .
NACE MR0175 / ISO 15156 Compliance – Hastelloy C-276 is qualified for sour service applications in the oil and gas industry, resisting sulfide stress cracking (SSC) and hydrogen induced cracking (HIC) in H₂S-containing environments .
Available Product Forms from Womic Steel
Seamless Pipe & Seamless Tube
- Outside Diameter: 6mm – 300mm
- Wall Thickness: 1mm – 30mm
- Length: Up to 12m
- Standards: ASTM B622, ASTM B829, ASME SB-622
- Applications: Heat exchanger tubes, chemical process piping, acid handling systems, pharmaceutical reactors
- Keywords: Hastelloy C-276 seamless pipe, UNS N10276 tube, 2.4819 pipe, alloy C-276 seamless tube
Welded Pipe
- Outside Diameter: 50mm – 1200mm
- Wall Thickness: 1.0mm – 25mm
- Standards: ASTM B619, ASTM B626, ASME SB-619, ASME SB-626
- Applications: Large-diameter process piping, flue gas desulfurization systems, chemical reactors
- Keywords: Hastelloy C-276 welded pipe, alloy C-276 ERW pipe, large diameter nickel pipe
Steel Bar (Round, Square, Flat, Hex)
- Diameter: 6mm – 300mm
- Surface: Hot rolled, Bright (cold drawn), Ground, Turned
- Standards: ASTM B574, ASME SB-574
- Applications: Valve stems, fasteners, shafts, pumps, machining stock, fittings
- Keywords: Hastelloy C-276 round bar, UNS N10276 bar stock, nickel alloy bar
Steel Plate & Sheet
- Thickness: 1mm – 100mm
- Width: Up to 2500mm
- Standards: ASTM B575, ASME SB-575
- Applications: Vessel shells, heat exchanger plates, structural components, flange blanks, chemical tank linings
- Keywords: Hastelloy C-276 plate, alloy C-276 sheet, N10276 plate
Steel Coil & Strip
- Thickness: 0.5mm – 6.0mm
- Width: 10mm – 1500mm
- Standards: ASTM B575
- Applications: Formed components, bellows, expansion joints, stampings, thin-walled tubing
- Keywords: Hastelloy C-276 coil, nickel alloy strip
Flanges & Pipe Fittings
- Types: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint
- Sizes: 1/2" – 48"
- Pressure Rating: Class 150 – Class 2500
- Standards: ASTM B564, ASME SB-564, ASME B16.5, ASME B16.47
- Fittings: Elbows, Tees, Reducers, Caps, Stub Ends, Couplings
- Keywords: Hastelloy C-276 flanges, alloy C-276 pipe fittings, UNS N10276 weld neck flange
Forgings
- Types: Rings, disks, shafts, valve bodies, pump parts, custom geometries
- Weight: Up to 3,000kg per piece
- Standards: ASTM B564, ASME SB-564
- Keywords: Hastelloy C-276 forging, alloy C-276 ring, forged block
Hastelloy C-276 Valves
- Types: Ball valves, Gate valves, Globe valves, Check valves, Plug valves
- Sizes: 1/2" – 24"
- Pressure Rating: Class 150 – Class 2500
- Temperature Range: -196°C to +400°C
- Design Standards: API 608, API 6D, BS 6364, ASME B16.34
- Seating: Stellite hardfaced, PCTFE (cryogenic), RPTFE, PEEK
- Actuation: Manual, Pneumatic, Electric
- Applications: Severe chemical service, acid handling, pharmaceutical reactors, wet chlorine service
- Keywords: Hastelloy C-276 ball valve, alloy C-276 gate valve, corrosion resistant valve
Wire & Springs
- Wire Diameter: 0.5mm – 12mm
- Springs: Custom spring manufacturing
- Standards: ASTM B574
- Keywords: Hastelloy C-276 wire, alloy C-276 springs, nickel alloy wire
Hastelloy C-276 vs Inconel 625 vs Incoloy 825
| Property | Hastelloy C-276 | Inconel 625 | Incoloy 825 |
| Nickel Content | Balance | ≥58% | 38-46% |
| Chromium Content | 14.5-16.5% | 20-23% | 19.5-23.5% |
| Molybdenum Content | 15-17% | 8-10% | 2.5-3.5% |
| Tungsten Content | 3-4.5% | None | None |
| Iron Content | 4-7% | ≤5% | ≥22% |
| PREN Value | ~67 | ≥45 | ~36 |
| Acid Resistance | Superior | Good | Excellent |
| Wet Chlorine Resistance | Excellent | Good | Moderate |
| Pitting Resistance | Superior | Excellent | Good |
| Seawater Resistance | Superior | Superior | Good |
| Weldability | Excellent | Excellent | Excellent |
| Cost | Highest | High | Moderate |
When to choose Hastelloy C-276: Applications requiring the highest corrosion resistance in severe environments including wet chlorine gas, mixed acid streams, and aggressive chloride media where other alloys fail. Superior pitting and crevice corrosion resistance justifies higher cost.
When to choose Inconel 625: Applications requiring both good corrosion resistance and high-temperature strength. Excellent in seawater and oxidizing environments, with better strength at elevated temperatures than C-276.
When to choose Incoloy 825: Applications requiring good corrosion resistance in acid environments at lower cost. Excellent for sulfuric and phosphoric acid service, suitable for sour service, but with lower pitting resistance than C-276 or 625 .
Applications of Hastelloy C-276
Chemical Processing – Hastelloy C-276 is widely used in reactors, heat exchangers, distillation columns, piping systems, pumps, and valves handling aggressive chemicals including sulfuric acid, hydrochloric acid, phosphoric acid, chlorine compounds, and organic acids . The alloy's universal corrosion resistance makes it suitable for processes where the corrosive media may vary or where the chemistry is not precisely controlled.
Wet Chlorine Service – The alloy is the preferred material for wet chlorine gas handling, including chlorine liquefaction plants, chlorine drying systems, chlorine dioxide production, and hypochlorite manufacturing . Its resistance to wet chlorine and chlorine compounds is unmatched by most other materials.
Flue Gas Desulfurization (FGD) – Hastelloy C-276 is used in FGD systems in coal-fired power plants for scrubber towers, reheater ducts, wet steam fan components, agitators, baffles, and flue ducts . The alloy's resistance to acid condensate and chloride-containing environments ensures long service life in these demanding applications.
Pulp and Paper Industry – The alloy is used in pulp digesters, bleaching equipment, and chemical recovery systems where exposure to aggressive chemicals and high temperatures is common.
Pharmaceutical and Food Processing – Hastelloy C-276 is used in pharmaceutical reactors, fermentation vessels, and food processing equipment where corrosion resistance and product purity are critical. Its resistance to corrosion ensures no contamination of pharmaceutical or food products.
Nuclear Waste Treatment – The alloy is used in nuclear waste reprocessing and radioactive waste treatment facilities where resistance to nitric acid and radiation environments is required.
Marine and Offshore – Hastelloy C-276 is used in seawater piping, offshore platform equipment, and subsea components where resistance to chloride-induced pitting and crevice corrosion is essential.
Oil and Gas – The alloy is used in sour gas production, wellhead equipment, and subsea flowlines requiring resistance to H₂S, CO₂, and chloride corrosion. Its NACE MR0175 / ISO 15156 compliance ensures reliable performance in sour service.
Standards & Specifications
| Product Form | ASTM Standard | ASME Standard |
| Seamless Pipe/Tube | ASTM B622, ASTM B829 | ASME SB-622, SB-829 |
| Welded Pipe | ASTM B619, ASTM B626 | ASME SB-619, SB-626 |
| Bar/Rod | ASTM B574 | ASME SB-574 |
| Plate/Sheet/Strip | ASTM B575 | ASME SB-575 |
| Forgings | ASTM B564 | ASME SB-564 |
| Fittings | ASTM B366 | ASME SB-366 |
| UNS Designation | N10276 | |
| Werkstoff Number | 2.4819 | |
| DIN Designation | NiMo16Cr15W | |
| Chinese Equivalent | NS334 |
Frequently Asked Questions
Q: Why is Hastelloy C-276 considered the "universal" corrosion-resistant alloy?
A: Hastelloy C-276 provides outstanding resistance to both oxidizing and reducing acids, wet chlorine gas, chlorides, and a wide range of aggressive media . Its versatility across multiple corrosive environments makes it suitable for applications where the process stream may vary or where mixed acids are present. No other alloy offers such broad corrosion resistance.
Q: What is the difference between Hastelloy C-276 and Inconel 625?
A: Hastelloy C-276 has higher molybdenum (15-17% vs 8-10%) and contains tungsten (3-4.5%), providing superior pitting and crevice corrosion resistance, especially in reducing acid environments . Inconel 625 contains niobium for strengthening and has better high-temperature strength than C-276. Choose C-276 for maximum corrosion resistance; choose 625 for applications requiring both corrosion resistance and high-temperature strength.
Q: Does Hastelloy C-276 require heat treatment after welding?
A: No. One of the key advantages of Hastelloy C-276 is that it maintains its corrosion resistance in the welded condition . The alloy's low carbon and silicon content ensures resistance to weld decay and intergranular corrosion without post-weld heat treatment.
Q: Is Hastelloy C-276 suitable for seawater service?
A: Yes. Hastelloy C-276 exhibits outstanding resistance to pitting and crevice corrosion in seawater . It is suitable for seawater piping, offshore platform equipment, and subsea components where chloride corrosion is a concern.
Q: What is the Chinese equivalent of Hastelloy C-276?
A: The Chinese equivalent grade is NS334 (耐蚀合金) . It is also commonly referenced by its UNS designation N10276 and Werkstoff number 2.4819.
Q: What product forms are available for Hastelloy C-276?
A: Womic Steel supplies Hastelloy C-276 in seamless pipe, welded pipe, steel bar, steel plate, steel coil, strip, flanges, pipe fittings, forgings, wire, and valves. Complete product specifications and size ranges are listed in the product availability section.
Contact Womic Steel
Website: www.womicsteel.com
E-mail: sales@womicsteel.com
Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel – Your reliable partner for Hastelloy C-276 (UNS N10276) seamless pipe, welded pipe, steel bar, steel plate, steel coil, flanges, fittings, forgings, and valves for chemical processing, wet chlorine service, flue gas desulfurization, pharmaceutical, and nuclear waste treatment applications worldwide. Full traceability, NACE MR0175 compliance, classification society certification, and EN 10204 Type 3.1/3.2 documentation available
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