Alloy C276 - UNS N10276

Chemistry

Typical Inventory

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

Product Description

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 1900F (1038C). It is also one of the few materials that withstands the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide.

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

General Data

Alloy 718 is a high strength nickel base superalloy used for cryogenic temperatures up to long term service at 1200°F. The alloy is readily fabricated and may be welded in either the annealed or precipitation (age) hardened condition. Anneal 1700 -1850°F, air cool or faster. Age 1325°F 8 hours, furnace cool to hold at 1150°F, for a total aging time of 18 hours, air cool. Alloy 718 will show a contraction of 0.0008 inch/inch after precipitation hardening.

• Density 75ºC 0.285 lb/in³
• Specific Gravity 7.88
• Thermal Expansion Coefficient (70 to 200ºF)
  9.0X10-6 in/in/Deg F
• Electrical Resistivity (68 °F)
  492 Ohms/ cir mil f
• Tensile Modulus of Elasticity
  28x106 psi
• Torsional Modulus of Elasticity
  10x106 psi

Applications

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 C276 sheet 0.044" thick in the heat-treated condition at 2050°F, rapid quenched, has an average olsen cup depth of 0.48". C276 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.

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.

Common Specifications

Please, note that the specs listed are for reference and are not comprehensive nor indicative of the actual specifications listed on the Material Test Report (MTR). If you have a special spec requirement, then please reach out to our sales department at 1-800-472-5569.

Machining

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.

Data Sheet

Download our datasheet here

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

Terms and Conditions

References

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