Alloy C276 - UNS N10276
Alloy C276, also called INCONEL® alloy C-276 or Hastelloy® C-276 alloy, is a nickel-molybdenumchromium wrought alloy that is generally considered a versatile corrosion-resistant alloy. Alloy C276 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 C22 suitable for use in the as-welded condition.
Alloy C276 has excellent resistance to both localized corrosion and oxidizing or reducing media. Because of its versatility, alloy C276 can be used where corrosive conditions are likely to occur or in multipurpose plants. Alloy C276'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 C276 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.
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
Torsional Modulus of Elasticity
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 is a nickel-chromium-molybdenum alloy with universal corrosion resistance unmatched by any other alloy. It has outstanding resistance to a wide variety of chemical process environments including ferric and cupric chlorides, hot contaminated mineral acids, solvents, chlorine and chlorine contaminated (both organic and inorganic), dry chlorine, formic and acetic acids, acetic anhydride, sea water and brine solutions and hypochlorite and chlorine dioxide solutions. Alloy C276 also resists formation of grain boundary precipitates in the weld heat affected zone making it useful for most chemical processes in the as-welded condition. It has excellent resistance to pitting and stress corrosion cracking.
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.
Data referring to mechanical properties and chemical analyses are the result of tests performed on specimens obtained from specific locations of the products in accordance with prescribed sampling procedures; any warranty thereof is limited to the values obtained at such locations and by such procedures. There is no warranty with respect to values of the materials at other locations.
|Condition||Ultimate Tensile (ksi)||0.2% Yield Strength (ksi)||Elong. % in 2 in.||Reduction of Area %||Hardness Rockwell C (HRC)|
|Max||CWA Level 2||142||126||31||67||C 28|
HPA also does a full line of high strength Nickel based alloys.
The typical properties listed on page one can be provided in rounds, sheet, strip & plate. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs.
|Metal Type||UNS N10276|
|Bar||ASTM B574 / ASME SB574, DIN 2.4819 17752|
|Sheet||ASTM B575 / ASME SB575, DIN 2.4819 17750|
|Plate||ASTM B575 / ASME SB575, DIN 2.4819 17750|
|Pipe||ASTM B619 / ASME SB619, ASTM B622 / ASME SB622, ASTM B626 / ASME SB626|
|Tube||ASTM B619 / ASME SB619, ASTM B622 / ASME SB622, ASTM B626 / ASME SB626|
|Forging||ASTM B564 / ASTM B574. ASTM B366|
|Weld Wire||AWS ER, NACE MR-01-75|
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. Detailed machining parameters are presented Tables 16 and 17. General plasma cutting recommendations are presented in Table 18.
INCONEL® is a registered trademark of the Special Metals Corporation group of companies. HASTELLOY® is a registered trademark of Haynes International Inc.