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INCONEL® C276 - The Welding Warehouse, Inc. INCONEL® C276 - The Welding Warehouse, Inc.

INCONEL® C276

INCONEL® C-276

INCONEL® C-276 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. It 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 and transfer piping.

Corrosion Resistance – Flue Gas Desulfurization

INCONEL® alloy C-276 is useful for flue gas desulfurization (FGD) systems to control air pollution from electric power plants. The alloy is used for various applications including scrubbers, ducting and stack liners. Scrubber liquors and gas condensates generally contain chlorides and the chloride level often determines the corrosion behavior of the materials. INCONEL® alloy C-276 has been shown to withstand higher chloride content than other alloys before the onset of localized corrosion in a simulated scrubber environment.

Corrosion Resistance – Oilfield Applications

INCONEL® alloy C-276 is one of the premier materials for recovery and handling of “sour” natural gas, which contains hydrogen sulfide and usually carbon dioxide and chlorides. The gas can be extremely corrosive to carbon and alloy steels, and may cause brittle failure of many alloys by sulfide stress cracking (hydrogen embrittlement) or stress-corrosion cracking. The high levels of nickel, chromium, and molybdenum in INCONEL® alloy C-276 make the alloy resistant to sour environments even at high temperatures in deep wells. The alloy is used for tubing and a variety of other downhole and surface components.

Heat Treatments

Hot forming should be between 1600 and 2250°F (870 and 1230°C), with all heavy forming above 2000°F (1090°C). INCONEL® alloy C-276 is normally annealed at 2100-2150°F (1150-1175°C) and rapidly cooled such as by water quenching.

Joining

INCONEL® alloy C-276 has good weldability and can be used as-welded for most applications. INCOWELD® filler metal and welding electrode 686CPT® can be used to “overmatch” INCONEL® alloy C-276 where enhanced corrosion resistance is required.

Specifications:

Nominal Chemical Composition (%)
Ni Mo Cr Fe W Co Mn C V P S Si
Bal 15.0-17.0 14.5-16.5 4.0-7.0 3.0-4.5 2.50 max 1.00 max 0.01 max 0.35 max 0.04 max 0.03 max 0.08 max