Hastelloy® C-276

Hastelloy® C-276 - UNS N10276 - W. Nr. 2.4819 - Alloy C276 - NiCrMo Alloy

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Table of Contents
Datasheet Chemistry
Inventory Applications
General Data Mechanical Properties
Specifications Machining, Welding, & Processing

Alloy C-276 is a nickel-chromium-molybdenum alloy with universal corrosion resistance unmatched by any other alloy. C-276 is also known as Inconel® C-276 or Hastelloy® C-276 and is an improved wrought version of alloy C in that it usually doesn't need to be solution heat-treated after welding and has vastly improved fabricability. This alloy is resistant to the formation of grain boundary precipitates, specifically in the weld-heat affected zone. This attribute makes Alloy C-276 suitable for use in the as-welded condition.

Alloy C-276 has excellent resistance to both localized corrosion and oxidizing or reducing media. Because of its versatility, alloy C-276 can be used where corrosive conditions are likely to occur or in multipurpose plants. Alloy C-276's native corrosion resistant properties extend to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, hot contaminated media (organic and inorganic), chlorine, formic and acetic acids, acetic anhydride, and seawater and brine solutions. It is used in flue gas desulfurization systems because of its excellent resistance to sulfur compounds and chloride ions encountered in most scrubbers. Alloy C-276 has excellent resistance to pitting, stress-corrosion cracking, and oxidizing atmospheres up to 1900 °F (1038 °C). It is also one of the few materials that withstands the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide.


View or download our C-276 datasheet here


Min% Max%
Ni Bal.
Mo 15.0 17.0
Cr 14.5 16.5
Fe 4.0 7.0
W 3.0 4.5
Co 2.5
Mn 1.0
C 0.01
V 0.35
P 0.04
S 0.03
Si 0.08
*Composition information provided by Special Metals' datasheet on alloy C-276, available here.

Typical Inventory

Round Bar, Hex Bar, Square Bar, Loose Coil, Plate, Tubing, Pipe, Nipple, Elbow, Fittings, Coupling, Flange, Fastener, Cut Disk, Machined, Forge, Rcs


Some typical applications include equipment components in chemical and petrochemical organic chloride processes and processes utilizing halide or acid catalysts. Other industry applications are pulp and paper (digesters and bleach areas), scrubbers and ducting for flue gas desulfurization, pharmaceutical, and food processing equipment.

Alloy C-276 sheet 0.044" thick in the heat-treated condition at 2050 °F, rapid quenched, has an average olsen cup depth of 0.48". C-276 can be successfully fabricated by many methods. The alloy tends to work harden but with the proper care, the alloy is readily hot and cold formed.

  • Digesters and bleach plants in the paper industry.
  • Components exposed to sour gas.
  • Equipment for flue-gas desulphurisation plants.
  • Evaporators, heat exchangers, filters and mixers used in sulphuric acid environments.
  • Sulphuric acid reactors.
  • Organic chloride process equipment.
  • Equipment for processes utilising halide or acid catalysts.

General Data

  • Superior corrosion resistance.
  • Almost double the yield strength.
  • Exceptionally low magnetic permeabilty.
  • Outstanding cryogenic properties.
  • Outstanding corrosion resistance.

Mechanical Properties

The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs. The table below shows Special Metals' Typical Room-Temperature Tensile Properties of Annealed Material alloy C-276 Bars, Sheet, & Plate. For most common forms and exceptions, check out the datasheet linked underneath the table.

Form UTS ksi (MPa) YS ksi (MPa) Elong., % Rockwell Hardness
Plate 107.4 (741) 50.3 (347) 67 89B
Sheet 115.5 (796) 54.6 (376) 60 86B
Bar 110.0 (758) 52.6 (363) 62 88B

UTS = Ultimate Tensile Strength, YS = Yield Strength

Link to Special Metals' datasheet on alloy C-276

Common Specifications

Note that the specifications listed are common for this alloy but are for reference only and may be specific to a certain form. The specifications listed are not comprehensive nor indicative of any edition, revision, or similar such as an amendment. Please, reach out to our sales department to request the Material Test Report (MTR) or to confirm your required specifications.

Form Standard
Identification UNS N10276, DIN 17744, DIN 17750 – 17754, W. Nr. 2.4819
Bar ASTM B574, ASTM B564, ASME SB574, ASME SB564
Sheet, Plate, or Strip ASTM B575, ASTM B906, ASME SB575, ASME SB906
Pipe - Seamless ASTM B622, ASME SB622
Pipe - Welded ASTM B619, ASME SB619
Tube - Seamless ASTM B622, ASTM B626, ASME SB622, ASME SB626
Tube - Welded ASTM B626, ASTM B751, ASME SB626, ASME SB751
Fitting ASTM B366, ASTM B462, ASME SB366, ASME SB462
Forging ASTM B564, ASTM B574, ASME SB564, ASME SB574
Weld Wire UNS N10276/ W. Nr. 2.4886/ AWS A5.14 ERNiCrMo-4/ ASME IX F-No. 43
Weld Electrode UNS W80276/ W. Nr. 2.4887/ AWS A5.11 ENiCrMo-4/ ASME IX F-No. 43


Nickel and cobalt based alloys can be difficult to machinine. However, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. These alloys harden rapidly, generate high heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:

  • CAPACITY - Machine should be rigid and overpowered as much as possible.
  • RIGIDITY - Work piece and tool should be held rigid. Minimize tool overhang.
  • TOOL SHARPNESS - Make sure tools are sharp at all times. Change to sharpened tools at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull tool.
  • TOOLS - Use positive rake angle tools for most machining operations. Negative rake angle tools can be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are suggested for most applications. High speed tools can be used, with lower production rates, and are often recommended for intermittent cuts.
  • POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the tool dwells in the cut, work hardening occurs, tool life deteriorates and close tolerances are impossible.
  • LUBRICATION - lubricants are desirable. Soluble oils are recommended especially when using carbide tooling.


Link to Special Metals' datasheet on alloy C-276

Hastelloy® is a registered trademark of Haynes International Inc.

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