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Alloy C-276 is one of the most corrosion-resistant nickel alloys available at Mehta Metals. It comes in thicknesses ranging from 3/16" (4.8mm) to 2 1 2" (63.5mm). In addition to chemical and petrochemical processing, it can be used for flue gas desulfurization, pulp and paper equipment, industrial waste, and air pollution control.

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Nickel alloy plate C-276 (UNS N10276) is a nickel-molybdenum-chromium-iron-tungsten alloy with a high corrosion resistance. Due to its high molybdenum content, it is resistant to localized corrosion. Low carbon helps maintain resistance to intergranular attack in heat-affected zones of welding joints by minimizing carbide precipitation during welding.

Nickel alloy plate alloy C-276 also has good high-temperature strength and moderate oxidation resistance, although it eventually forms embrittling precipitates at high temperatures.

Specification Sheet Overview

for Alloy C-276 (UNS N10276)

  1. Nr. 2.4819:

In both oxidizing and reducing environments, this nickel-molybdenum-chromium alloy exhibits excellent corrosion resistance

General Properties

An austenitic nickel-molybdenum-chromium alloy with a small addition of tungsten, alloy C-276 nickel alloy plate (UNS N10276) is one of the most corrosion-resistant materials available for process industries. As well as being corrosion resistant in oxidizing and reducing environments, alloy C-276 nickel alloy plate has excellent corrosion resistance.

Because of the high molybdenum and chromium contents, combined with the addition of tungsten, alloy C-276 nickel alloy plate resists cracking, pitting, crevice corrosion, and corrosion in general.

While alloy C-276 nickel alloy plate can operate in oxidizing atmospheres up to 1900°F (1038°C), it lacks sufficient chromium content to operate effectively in environments such as hot, concentrated nitric acid.

Due to its low carbon content, nickel alloy plate Alloy C-276 can be used in its as-welded condition. This alloy has a higher work-hardening rate than austenitic stainless steels, so it should be taken into consideration when hardening by cold working. Hardening by heat is not possible.

It is easy to weld and process alloy C-276 nickel alloy plate using the same fabrication techniques used for austenitic stainless steels and nickel-based alloys hastelloy c276, hastelloy c276 composition, alloy c276, hastelloy c22 vs c276, c276 composition, hastelloy c276 mechanical properties, hastelloy c276 equivalent material, hastelloy c276 chemical composition.

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Applications

  • Equipment for flue gas desulfurization - stack liners, absorbers, ducts, dampers and stack gas re-heaters
  • Process equipment such as heat exchangers, pressure vessels, tanks, evaporators, piping, flanges, fittings, pumps, and valves
  • Production of oil and gas - components of the sour gas service
  • Reactor vessels, piping, flanges, fittings, pumps, and valves for pharmaceutical production
  • A bleaching vessel and a digester for pulp and paper
  • The treatment of wastes - industrial, municipal, and toxic waste incinerators
  • Processing of ores

Corrosion Resistance

Nickel alloy plate alloy C-276 performs exceptionally well in both oxidizing and reducing environments, and is one of the most corrosion-resistant materials available. It is resistant to chloride stress corrosion cracking, pitting, crevice corrosion, and general corrosion. Furthermore, it can be used as-welded because it is resistant to carbide precipitation during welding.

Sulfuric, hydrochloric, formic, acetic, and phosphoric acids are resistant to the alloy in chemical processing applications. As one of the few nickel alloy plates that can withstand wet chlorine gas, hypochlorite, and chlorine dioxide solutions, alloy C-276 is capable of surviving environments containing acid chlorides, solvents, and acetic anhydride.

It is highly resistant to concentrated solutions of oxidizing salts, such as copper and iron chloride, in alloy C-276 nickel alloy plate. Seawater is another place it performs well, particularly under crevice conditions where stainless steel, Alloy 400, and Alloy 625 fail.

In flue gas desulfurization systems, corrosion-resistant materials face a challenging environment. The scrubber liquors and gas condensates often contain chlorides. In these systems, alloy C-276 nickel alloy plate has been shown to withstand chloride levels higher than other grades without developing localized corrosion.

As part of the recovery and processing of sour natural gas, which contains hydrogen sulfide, carbon dioxide, and chlorides, alloy C-276 nickel alloy plate is widely used. Despite the fact that carbon and alloy steels are not able to withstand such a harsh environment, Alloy C-276 nickel alloy plate is resistant to sour environments even at high temperatures in deep wells due to its rich chemistry. They are prone to sulfide stress cracking and stress corrosion cracking.

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Fabrication Data

With standard shop fabrication practices for austenitic stainless steels and nickel-based alloys, alloy C-276 nickel alloy plate can be easily welded and processed.

Hot Forming

Alloy C-276 nickel alloy plate is suitable for hot-working between 1600°F and 2250°F (870°C and 1230°C). After hot working, the alloy should be water quenched. Heat treatment is recommended to ensure maximum corrosion resistance.

Cold Forming

When cold working alloy C-276, the plate should be annealed. With a high degree of cold working, an in-process anneal may be necessary. It has a higher work-hardening rate than austenitic stainless steels. A solution anneal may be required if the alloy undergoes a deformation greater than 15% during cold working.

Welding

There are various standard welding processes that can be used to join Nickel alloy alloy plate C-276, including GTAW (TIG), PLASMA, GMAW (MIG/MAG), and SMAW (MMA). It is not necessary to heat treat the plate post-weld. A stainless steel wire brush will remove heat tint after welding and produce a surface that will not require additional pickling.

Machining

It is better to machine Alloy C-276 nickel alloy plate in the annealed condition. Since Alloy C-276 nickel alloy plate is prone to work-hardening, only low cutting speeds should be used and the cutting tool should always be engaged. To avoid contact with the previously formed work-hardened zone, adequate cutting depth is required.

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