ThePipingMart Blog Products Hastelloy C276 Flanges – Composition, Properties and Uses

Hastelloy C276 Flanges – Composition, Properties and Uses

Hastelloy C276 Flanges - Composition Properties And Uses

If you are looking for a flange that offers exceptional resistance to corrosion, high-temperature, and aggressive chemical environments, then UNS N10276 flanges can be your ultimate solution. These flanges are made from a nickel-molybdenum-chromium alloy that can withstand severe corrosive environments and high-stress conditions. This blog post will look at the composition, physical properties, mechanical properties, uses, heat treatment, and corrosion resistance of Hastelloy C276 flanges. Read on to learn more about this remarkable alloy.


Hastelloy C276 Flanges Composition

Alloy C276 Forged Flange is a nickel-molybdenum-chromium alloy with a small addition of tungsten. The alloy has a chemical composition of Ni58%, Mo16%, Cr16%, Fe5%, W3%, and Co 2.5%. Adding molybdenum and chromium enhances the corrosion resistance of this alloy, while tungsten helps improve its resistance to localized corrosion. Additionally, the low carbon content in Hastelloy C276 prevents carbide precipitation in the welding zone, which can lead to intergranular corrosion.

Grade C Mn Si S Co Ni Cr Fe Mo P
C276 0.010 max 1.00 max 0.08 max 0.03 max 2.50 max 50.99 min* 14.50 ? 16.50 4.00 ? 7.00 15.00 ? 17.00 0.04 max

Hastelloy C276 Flanges Physical Properties

ASTM B564 Hastelloy C276 Pipe Flanges has excellent physical properties ideal for harsh and corrosive environments. The alloy has a density of 8.89 g/cm3, a melting point of 1370°C, and a thermal expansion coefficient of 12.2 μm/m°C. Moreover, the thermal conductivity of Hastelloy C276 is 9.9 W/mK, and its specific heat capacity is 0.41 J/gK. These physical properties make Hastelloy C276 a suitable material for high-temperature applications.

Density Melting Range Specific Heat Magnetic Permeability
0.321 8.89 2415-2500 1323-1371 0.102 427 1.0002 1.0002
lb/in3 g/cm3 °F °C Btu/lb.°F J/kg*°C 200 oersted 15.9 kA/m

Hastelloy C276 Flanges Mechanical Properties

Alloy C276 Blind Flanges has excellent mechanical properties that make it suitable for high-stress environments. The alloy has a yield strength of 275 MPa, a tensile strength of 690 MPa, and an elongation of 40%. Moreover, the alloy has a hardness of 217 HB and a modulus of elasticity of 205 GPa. These mechanical properties make UNS N10276 Flat Face Flanges an ideal material for critical applications requiring high strength and durability.

Grade Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
C276 8.89 g/cm3 1370 °C (2500 °F) Psi – 52,000 , MPa – 355 Psi – 1,15,000 , MPa – 790 40 %

Hastelloy C276 Flanges Equivalent

Hastelloy C276 NW 0276 2.4819 NiMo16Cr15W ХН65МВУ N10276 ЭП760

Hastelloy C276 Flanges Uses

Alloy C276 Flange find extensive use in various industries, including chemical processing, oil and gas, power generation, and pollution control. These flanges are commonly used in pipes, valves, vessels, and other critical components that come into contact with harsh and corrosive chemicals. Alloy C276 Flanges are particularly popular in the chemical processing industry due to their remarkable resistance to oxidizing and reducing environments.

Hastelloy C276 Flanges Heat Treatment

UNS N10276 SORF Flange are typically solution heat-treated to enhance their mechanical properties. The solution heat treatment involves heating the flanges to 1175°C and holding them there for 15 minutes. After the solution heat treatment, the flanges experience rapid cooling in water or a suitable cooling medium. This process helps dissolve any carbides or precipitates that may form during the manufacturing process, thereby improving the flange’s resistance to intergranular corrosion.

Hastelloy C276 Flanges Corrosion Resistance

UNS N10276 Flat Face Flanges are renowned for their exceptional corrosion resistance to oxidizing and reducing environments. The alloy has a high nickel content, which makes it resistant to various inorganic acids, such as hydrochloric, sulfuric, and phosphoric acids. Moreover, the molybdenum and chromium contents improve the alloy’s resistance to pitting, crevice, and stress corrosion cracking. These remarkable corrosion resistance properties make Hastelloy C276 flanges ideal for harsh and aggressive chemical environments.



Hastelloy C276 flanges are a remarkable alloy that offers excellent resistance to corrosion, high temperature, and high-stress environments. Its nickel-molybdenum-chromium-tungsten composition, exceptional physical and mechanical properties, and remarkable corrosion resistance make it ideal for use in various industries, including chemical processing, power generation, and pollution control. Its ease of fabrication, solution heat treatment process, and outstanding welding characteristics make it a popular choice for many industrial applications. With these excellent properties, it’s no wonder Hastelloy C276 flanges are the go-to flange for corrosive environments.

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