Grade – Hastelloy C-276 : Welding Material

Hastelloy C-276 Welding Material

UNS Number N10276
Other common names: Alloy C276, Hastelloy C, Inconel® C-276

Hastelloy C276 is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures. This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.

Although there are several variations of the Hastelloy nickel alloy, Hastelloy C-276 is by far the most widely used.

Alloy C-276 is widely used in the most severe environments such as chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment, and recovery of sour natural gas.

  • Bar
  • Sheet
  • Plate
  • Pipe & Tube (welded and seamless)
  • Pipe Fittings
  • Welding Wire
Corrosion Resistant Hastelloy C276

Considered one of the most versatile corrosion resistant alloys available, Hastelloy C-276 exhibits excellent resistance in a wide variety of chemical process environments including those with ferric and cupric chlorides, hot contaminated organic and inorganic media, chlorine, formic and acetic acids, acetic anhydride, seawater, brine and hypochlorite and chlorine dioxide solutions. In addition, alloy C-276 resists formation of grain boundary precipitates in the weld heat affected zone making it useful for most chemical processes in the as-welded condition. This alloy has excellent resistance to pitting and stress corrosion cracking.

What are the characteristics of Hastelloy C276?

Excellent corrosion resistance in reducing environments

Exceptional resistance to strong solutions of oxidizing salts, such as ferric and cupric chlorides

High nickel and molybdenum contents providing good corrosion resistance in reducing environments

Low carbon content which minimizes grain-boundary carbide precipitation during welding to maintain resistance to corrosion in heat-affected zones of welded joints

Resistance to localized corrosion such as pitting and stress-corrosion cracking

One of few materials to withstand the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide

Chemical Composition, %
NiMoCrFeWCoMnCV
Remainder15.0-17.014.5-16.54.0-7.03.0-4.52.5 max1.0 max.01 max.35 max
In what applications is Hastelloy C-276 used?

Pollution control stack liners, ducts, dampers, scrubbers, stack-gas reheaters, fans and fan housings

Flue gas desulfurization systems

Chemical processing components like heat exchangers, reaction vessels, evaporators, and transfer piping

Sour gas wells

Pulp and paper production

Waste treatment

Pharmaceutical and food processing equipment

Fabrication of Hastelloy C-276

Hastelloy C-276 alloy can be forged, hot-upset and impact extruded. Although the alloy tends to work-harden, you can have it successfully spun, deep-drawn, press formed or punched. All of the common methods of welding can be used, although the oxyacetylene and submerged arc processes are not recommended when the fabricated item is for use in corrosion service.

Hastelloy C-276 Welding Materia

Alloy C276 welding products are used as matching composition filler material for welding C276 alloy wrought and cast products, for dissimilar welding applications including other nickel-chromium-molybdenum alloys and stainless steels, and for weld overlay or cladding of steels.

Specifiacations: ASME-SFA-5.14 ERNiCrMo-4

Filler metals are available in spools and in cut lengths from the above diameters. Straight lengths are available in 36″ lengths.

ASTM Specifications
Pipe SmlsPipe WeldedTube SmlsTube WeldedForgingFitting
B622B619B622B626B564B366
Mechanical Properties

Typical Room Temperature Tensile Properties of Annealed Material

Product FormTensile Min. (ksi).2% Yield Min. (ksi)Elongation Min.
Plate107.45067
Sheet115.554.660
Pipe & Fittings105.445.470
Other Products
Pipe Fittings
Pipe Fittings
Flanges
Quality
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