Alloy C-276

UNS N10276, Alloy C-276, Hastelloy® C276, Inconel® C276, W.Nr. 2.4819, NS334
Note that the designation “Inconel® C276” is registered trademarks of the Special Metals Corporation group of companies.
Note that the designation “Hastelloy® C276” is registered trademarks of the Hanes International.

UNS N10276 is known for its corrosion resistance in a wide range of aggressive media. The high molybdenum content imparts resistance to localized corrosion such as pitting. The low carbon minimizes carbide precipitation during welding to maintain resistance to intergranular attack in heat-affected zones of welded joints.
By virtue of extremely low carbon and silicon contents, N10276 is a wrought Ni-Cr-Mo material to alleviate concerns over welding. Like other nickel alloys, it is ductile, easy to form and weld, and possesses exceptional resistance to stress corrosion cracking in chloride-bearing solutions (a form of degradation to which the austenitic stainless steels are prone). With its high chromium and molybdenum contents, it is able to withstand both oxidizing and non-oxidizing acids, and exhibits outstanding resistance to pitting and crevice attack in the presence of chlorides and other halides. Furthermore, it is very resistant to sulfide stress cracking and stress corrosion cracking in sour, oilfield environments.

UNS N10276 is used in chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment and the recovery of “sour” natural gas. Applications in air pollution control include stack liners, ducts, dampers, scrubbers, stack-gas re-heaters, fans and fan housings. In chemical processing, the alloy is used for components including heat exchangers, reaction vessels, evaporators, transfer piping and columns.

(at room termperature in solution annealed condition)

N10276 is resistant to general corrosion, stress corrosion cracking, pitting and crevice corrosion in a broad range of severe environments. Its resistance to carbide precipitation during welding maintains corrosion resistance in the heat affected zones of welded joints.
N10276 has exceptional resistance to sulfuric acid and hydrochloric acid. It resists many of the most severe media encountered in chemical processing, including reducing and oxidizing acids, highly oxidizing, neutral, and acid chlorides, solvents, formic and acetic acids, acetic anhydride, wet chlorine gas, hypochlorites, and chlorine solutions. It has excellent resistance to phosphoric acid. At all temperatures below the boiling point and at concentrations lower than 65 wt%, tests have shown corrosion rates of less than 5 mpy (0.13 mm/y).
N10276 exhibits excellent resistance to corrosion by seawater especially under crevice conditions which induce attack in other commonly used materials such as 316 stainless steel, Monel® 400, and Inconel 625.

Cold worked and bright annealed

Cold worked, bright annealed, polished (MP, EP etc.)

Capillary tube

• _◎ OD 0.30 ~ 3.0 mm
• _◎ WT 0.05 ~ 0.5 mm

Precision seamless tube

• _◎ OD 3.0 ~ 89 mm
• _◎ WT 0.10 ~ 10.0 mm

HP / UHP BA+ tube

• _◎ OD 3.0 ~ 76 mm
• _◎ WT 0.10 ~ 10.0 mm