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Alloy C276 - a kind of tungsten corrosion resistant Ni-Cr-Mo Alloy
UNS N10276 is a tungsten-containing nickel-chromium-molybdenum-alloy with very low silicon and carbon content. The alloy has excellent corrosion resistance to most corrosive media in both oxidizing and reducing states. Excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking. The alloy is suitable for use in various chemical process industries containing oxidizing and reducing media. Hastelloy C-276 is one of only a few materials that are resistant to moist chlorine, hypochlorite and chlorine dioxide solutions, and the alloy has significant resistance to high concentrations of chloride solutions (e.g. ferric chloride and copper chloride).
Properties
●Excellent corrosion resistance to most corrosive media in both oxidized and reduced states.
●Excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking.
Composition
% | Ni | Cr | Mo | Fe | W | Co | C | Mn | Si | V | P | S | |
Alloy C | min | balance | 14.5 | 15 | 4 | 3 | - | - | - | - | - | - | - |
max | 16.5 | 17 | 7 | 4.5 | 2.5 | 0.08 | 1 | 1 | 0.35 | 0.04 | 0.03 | ||
Alloy C276 | min | balance | 14.5 | 15 | 4 | 3 | - | - | - | - | - | - | - |
max | 16.5 | 17 | 7 | 4.5 | 2.5 | 0.01 | 1 | 0.08 | 0.35 | 0.04 | 0.03 |
Application areas
Widely used in chemical and petrochemical applications, such as in components and catalytic systems that come into contact with organic substances containing chlorides. The material is particularly suitable for use in high temperature, inorganic and organic acids (e.g. formic and acetic acid) mixed with impurities, and in corrosive environments in seawater.
Other applications:
● Pulp and paper industry, e.g. boiling and bleaching vessels
●Scrubber towers, reheaters, wet steam fans, etc. in FGD systems
●Equipment and components for operation in sour gas environment
●Reactors for acetic acid and acidic products
●Sulfuric acid condenser
●Methylene-diphenyl isocyanate (MDI)
●Production and processing of impure phosphoric acid
Corrosion Resistance
Alloy C276 is used in a variety of chemical process industries containing oxidizing and reducing media.The high content of molybdenum and chromium makes the alloy resistant to the corrosion of chloride ion, and the tungsten element further improves the corrosion resistance.One of the few materials in C276 that is resistant to wet chlorine, hypochlorite and chlorine dioxide solutions, the alloy has significant corrosion resistance to high concentrations of chloride solutions (e.g. ferric chloride and copper chloride).
