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Hastelloy C276 is a Super Duplex Steel composed of nickel, molybdenum and chromium. This alloy is resistant to the formation of grain boundary precipitates in the weld heat affected zone, making it suitable for most chemical process applications in the welded condition. Hastelloy C276 has excellent resistance to pitting, stress corrosion cracking and oxidizing atmospheres up to 1900°F, and can cope with a wide chemical environments.
Hastelloy C276 (UNS N10276/2.4819) is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, that is considered the most versatile corrosion resistant alloy available. This material is especially suitable for use in high temperature, inorganic and organic acids mixed with impurities (such as formic acid and acetic acid), and seawater corrosive environments.
Hastelloy C276 is a nickel-molybdenum-chromium alloy with small amounts of tungsten and iron. Its exact composition varies depending on the manufacturing process and grade, but it generally contains significant amounts of chromium, molybdenum, iron and tungsten. The alloy also contains trace amounts of carbon, silicon, sulphur, manganese and cobalt, which are added in the alloy.
Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Cr | Mo | Fe | Co≤ | W | V≤ |
C276 | 0.01 | 1.0 | 0.04 | 0.03 | 0.08 | 14.5-16.5 | 15.0-17.0 | 4.0-7.0 | 2.5 | 3.0-4.5 | 0.35 |
Hastelloy C276 is known for its excellent mechanical properties, including high strength, toughness and ductility. It has a tensile strength of 690 MPa, a yield strength of 283 MPa and a hardness of approximately 40HB. In addition, the alloy can withstand high temperatures and pressures, making it suitable for use in oil and gas, chemical and petrochemical industry environments.
Properties | Value |
Tensile Strength (min) | 690MPa |
Yield Strength (min) | 283MPa |
Elongation (min) | 40% |
Hardness (max) | 100HB |
Hastelloy C276 has excellent physical properties, including a density 8.89 g/cm³ and a melting point of 1370-1400°C. The alloy has a thermal expansion coefficient of 12.5μm/m°C and a specific heat capacity of 427 J/kg°C. These properties make it a thermally stable material, even under harsh conditions.
Density: 8.89 g/cm³
Melting point: 1370-1400 ℃
Thermal expansion coefficient: 12.5μm/m°C
Specific heat capacity: 427 J/kg°C
Standard | Value |
WERKSTOFF NR. | 2.4819 |
UNS | N10276 |
JIS | NW 0276 |
GOST | ХН65МВУ |
EN | NiMo16Cr15W |
OR | ЭП760 |
Product | Standard | Show |
Hastelloy C276 Sheet Plate | ASTM B575/ Din 17750 |  |
Hastelloy C276 Bars | ASTM B575/ Din 17750 |  |
Hastelloy C276 Fittings | ASTM B366 |  |
Hastelloy C276 Forgings | ASTM B564 |  |
Hastelloy C276 Pipe And Tube | ASTM B619 / ASTM B622 ASTM B626 / Din 17751 |  |
Hastelloy C276 Weld Wire | A5.14 ERNiCrMo-4 |  |
Hastelloy C276 Weld Electrode | A5.14 ERNiCrMo-4 |  |
Corrosion Resistance
The most important characteristic of Hastelloy C276 is its excellent corrosion resistance to aggressive media such as sulfuric acid, hydrochloric acid, and chlorine dioxide. It is also resistant to pitting, crevice corrosion, and stress corrosion cracking, making it an excellent choice for marine and offshore structures and high-pressure water systems.
Heat Treatment
Hastelloy C276 can be heat treated to improve its mechanical properties, but it is not recommended for use in materials exposed to high temperatures or corrosive media.
Machinability
Due to its high strength and low thermal conductivity, machining Hastelloy C276 can be challenging, but it is easily accomplished with the correct tools and techniques.
Weldability
Welding, on the other hand, requires special care to minimize the risk of cracking and porosity. Gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW) are the most commonly used welding processes for Hastelloy C276.
Hastelloy C276 alloy is used in a variety of industries for its corrosion resistance and high-temperature stability. Applications range from chemical processing equipment, pollution control devices, and heat exchangers to aerospace components, nuclear reactors, and pharmaceutical equipment. The alloy is also used in sulfuric acid plants, renowned for its ability to withstand highly acidic conditions and prevent corrosion.
Petrochemical Industry
Hastelloy C276 alloy is often used in critical equipment such as reactors, heat exchangers, and piping systems. These devices often operate in environments with high temperatures, high pressures, and highly corrosive media, placing extremely high demands on the material's corrosion resistance and mechanical properties.
Ocean Engineering Industry
Ocean engineering environments are characterized by high salt content, high humidity, and high corrosion rates. C276 alloy exhibits excellent corrosion resistance in seawater and salt spray environments, making it widely used in offshore platforms, submarines, and desalination equipment. Its excellent resistance to pitting and crevice corrosion makes it a key material of choice in the offshore industry.
Aerospace Industry
In the aerospace industry, Hastelloy C276 alloy is used in turbine engine components, combustion chamber liners, and other high-temperature structural parts due to its excellent high-temperature performance and oxidation resistance. These components work under high temperature and high pressure environments, and have extremely high requirements on the creep resistance and high temperature strength of the materials.
