Excellent Corrosion Resistance of Hastelloy C276
Hastelloy C276 is a nickel-molybdenum-chromium alloy with added iron and tungsten, offering exceptional corrosion resistance in a wide range of aggressive environments, particularly in mixed oxidizing and reducing media. It resists wet chlorine gas, hypochlorites, chlorides, sulfuric acid, phosphoric acid, organic acids, and more.
What is Hastelloy C276?
Hastelloy C276 is a high-performance nickel-based corrosion-resistant alloy with outstanding resistance to localized corrosion such as pitting, crevice corrosion, and stress corrosion cracking. It is widely used in chemical processing, environmental protection, marine engineering, and pharmaceutical industries.
Hastelloy C276 Equivalent Grades
| Standard / System | Equivalent Designation |
| UNS | N10276 |
| W.Nr. | 2.4819 |
| ASTM | B575 / B622 / B619 / B564 / B366 |
| JIS | NW0276 |
| ISO / DIN | NiMo16Cr15W |
Hastelloy C276 Chemical Composition
| Element | Content (%) |
| Nickel (Ni) | Balance (~57%) |
| Molybdenum (Mo) | 15.0 – 17.0 |
| Chromium (Cr) | 14.5 – 16.5 |
| Iron (Fe) | 4.0 – 7.0 |
| Tungsten (W) | 3.0 – 4.5 |
| Cobalt (Co) | ≤ 2.5 |
| Carbon (C) | ≤ 0.01 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.08 |
| Sulfur (S) | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.04 |
| Vanadium (V) | ≤ 0.35 |
Hastelloy C276 Mechanical Properties (Annealed, Room Temperature)
| Property | Typical Value |
| Tensile Strength | ≥ 690 MPa |
| Yield Strength (0.2%) | ≥ 283 MPa |
| Elongation | ≥ 40% |
| Brinell Hardness | ≤ 241 HB |
Hastelloy C276 Physical Properties
| Property | Value |
| Density | 8.89 g/cm³ |
| Melting Point | 1325–1370°C |
| Thermal Conductivity | ~10 W/m·K (RT) |
| Electrical Resistivity | ~1.24 μΩ·m |
| Specific Heat | 0.418 J/g·K |
| Magnetic Properties | Non-magnetic |
Applications of Hastelloy C276
- Chemical reactors, heat exchangers, pressure vessels, and piping
- Flue gas desulfurization (FGD) systems
- Seawater desalination and offshore structures
- Sour gas (H₂S) processing equipment
- Pharmaceutical and food processing systems requiring high purity and corrosion resistance
- Bleaching equipment in the pulp and paper industry
Advantages of Hastelloy C276
- Excellent resistance to a wide range of corrosive environments
- Low carbon content provides excellent resistance to intergranular corrosion
- Outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking
- Good workability and weldability
- Suitable for both oxidizing and reducing conditions
Limitations of Hastelloy C276
- More expensive than stainless steel and conventional nickel alloys
- Work hardens rapidly during cold working
- Risk of crevice corrosion in stagnant chloride-rich environments
- Requires precise heat treatment for optimal properties
How is Hastelloy C276 Manufactured?
- Raw Material Melting
High-purity nickel, molybdenum, chromium, and other alloying elements are melted in vacuum induction furnaces or electro-slag remelting systems to ensure chemical consistency. - Casting
The molten metal is cast into ingots or continuously cast billets for further processing. - Hot Working
Hot rolling, forging, or extrusion is performed at 1100–1200°C to produce plates, tubes, rods, etc. - Annealing
Homogenizing annealing at ~1100°C relieves internal stress, refines the grain, and enhances ductility and corrosion resistance. - Cold Working
Cold rolling or drawing is used for final shaping, improving dimensional precision and mechanical strength. - Quality Control & Testing
Finished products are tested for mechanical properties, chemical composition, corrosion resistance, and undergo non-destructive testing (UT, RT, PT, etc.) to meet ASTM, ASME, and NACE standards.
FAQ About Hastelloy C276
C276 contains tungsten and offers stronger resistance to localized corrosion; C22 has better performance in strongly oxidizing environments and is easier to weld.
Yes, using matching filler metals like ERNiCrMo-4. It supports TIG, MIG, and arc welding with proper heat input control.
It resists wet chlorine, hydrochloric acid, sulfuric acid, phosphoric acid, seawater, hypochlorites, organic acids, and more.
Typically from -196°C to 1040°C, suitable for high-temperature and aggressive corrosion environments.
No, C276 is non-magnetic and suitable for use in applications requiring non-magnetic materials.
Summary
This article introduces Hastelloy C276, explains the alloy, and discusses its composition, properties, and applications. For more information about Hastelloy C276, please get in touch with an MT.BOLTS representative.
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