Alloy C-276 / UNS N10276 / W.Nr. 2.4819

Description

Alloy C-276 is a solid solution strengthened nickel-molybdenum-chromium alloy with a small amount of tungsten. Alloy C-276 exhibits excellent corrosion resistance in a variety of harsh environments and media. Like many other nickel alloys, it is ductile, easily formed and welded. This alloy is used in most industrial settings where aggressive chemical environments are present and other alloys have failed.

Industries and Applications

Alloy C-276 is frequently used in many industries, including chemical and petrochemical processing, oil and gas, power generation, pharmaceutical, pulp and paper production and waste water treatment. End use applications include stack liners, ducts, dampers, scrubbers, stack gas reheaters, heat exchangers, reaction vessels, evaporators, transfer piping and many other highly corrosive applications.

Resistance to Corrosion

Alloy C-276 is one of the most universally corrosion resistant alloys available today. It is used in a variety of environments ranging from moderately oxidizing to strong reducing conditions. Alloy C-276 has exceptional resistance to sulfuric acid, hydrochloric acid, formic acid, acetic acid, chlorides, solvents, wet chloride gas, hypochlorite and chlorine solutions. Alloy C-276 has excellent resistance to phosphoric acid at all temperatures below boiling and concentrations lower than 65%. The limiting factor when dealing with strong oxidizing environments is the low chromium content, which means hot concentrated nitric acid environments are not desirable.

Alloy C-276 has superior resistance to pitting, stress corrosion cracking and oxidizing atmospheres. Alloy C-276 also exhibits resistance to corrosion by seawater in crevice conditions, which can induce aggressive attack in other commonly used materials.

Fabrication and Heat Treatment

Alloy C-276 can be formed using various cold and hot working processes. Like other nickel alloys, alloy C-276 work hardens quickly, though it can be cold formed using aggressive methods like deep drawing, press forming and punching. Hot forming should be performed within a temperature range between 1600°F and 2250°F (870°C and 1230°C) with heavier sections being heated to a minimum temperature of 2000°F before forming. Annealing of the material after working is advised and should be performed at a temperature between 2050°F and 2150°F, followed by a rapid quench in a protective atmosphere or agitated reducing quench bath. To obtain a reducing quench bath, add 2% (by volume) of either ethyl or propyl alcohol to water.

Common Trade Names

INCONEL® alloy C-276, Hastelloy® C-276 alloy

INCONEL® is a registered trademark of the Special Metals Corporation group of companies. HASTELLOY® is a registered trademark of Haynes International Inc.

Available in the following forms:

Flanges
Flanges
Custom Forgings
Custom Forgings
Fasteners
Fasteners
Welding Products
Welding Products
Corrosion Materials Coil
Coil

Chemical Composition (%)

(Ni) Nickel Remainder
(Mo) Molybdenum 15.0 to 17.0
(Cr) Chromium 14.5 to 16.5
(Fe) Iron 4.0 to 7.0
(W) Tungsten 3.0 to 4.5
(Co) Cobalt 2.5 max
(Mn) Manganese 1.0 max
(V) Vanadium 0.35 max
(Si) Silicon 0.08 max
(P) Phosphorus 0.04 max
(S) Sulfur 0.03 max
(C) Carbon 0.010 max

Applicable Specifications*

Form ASTM ASME VdTÜV
Bar B574, B5641 SB574, SB5641 400
Plate & Sheet B575 SB575 400
Welded Pipe B619 SB619
Welded Tube B626 SB626
Seamless Pipe & Tube B622 SB622


1
On diameters above 3.5″, B564/SB564 is dual certified.

*EN10204-3.1 applies to all product forms.

The information shown on this page is intended to be used as a guide and may be revised at any time without prior notice. The information is believed to be reliable and accurate, however Corrosion Materials does not make any warranty or assume any legal liability with respect to the accuracy, completeness or usefulness of the information.