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Hastelloy® Nickel Alloy C-276
UNS Number 10276
Although there are several variations of the Hastelloy® nickel alloy, Hastelloy® C-276 is by far the most widely used. Hastelloy® C-276 remains resilient in the most corrosive environments such as in chemical processing, pollution control, pulp and paper production, waste treatment and the recovery of "sour" natural gas.
- Applications in air-pollution include stack liners, ducts, dampers, scrubbers, stack-gas reheaters, fans and fan housings. Hastelloy® is used in flue gas desulfurization systems because of excellent resistance to the sulfur compounds and chloride ions encountered in most scrubbers.
- In chemical processing, the alloy is used for numerous components including heat exchangers, reaction vessels, evaporators, and transfer piping.
- In sour gas wells (those containing hydrogen sulfide), Hastelloy® delivers a high level of performance in various downhole and surface components including tubing, coupling, and subsurface safety valves.
Chemical Composition:
| Element | Avg. Nominal % |
|---|---|
| Nickel | Balance |
| Cobalt | 2.5 Max |
| Chromium | 15.5 |
| Molybdenum | 16.0 |
| Tungsten | 3.75 |
| Iron | 5.5 |
| Silicon | 0.08 Max |
| Manganese | 1.0 Max |
| Carbon | 0.01 Max |
|
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Hastelloy® C-276 Offers Excellent Corrosion Resistance
A nickel-molybdenum-chromium wrought alloy with low carbon content, Hastelloy® exhibits excellent resistance in a wide variety of chemical process environments including those with as ferric and cupric chlorides, hot contaminated organic and inorganic media, chlorine, formic and acetic acids, acetic anhydride, and seawater and brine solutions.
- Nickel and molybdenum contents are high to provide good corrosion resistance in reducing environments.
- Chromium imparts strong resistance to oxidizing media.
- Molybdenum also adds resistance to localized corrosion such as pitting and stress-corrosion cracking.
-
Carbon content is low thus minimizing grain-boundary carbide precipitation
during welding to maintain resistance to corrosion in heat-affected zones of welded
joints.
Hastelloy® is one of the few materials able to withstand the corrosive effects of wet chlorine gas, hypochlorite and chorine dioxide.
Fabrication with 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 Hastelloy® 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.
ASME Boiler and Pressure Vessel Codes Referencing Hastelloy®
Hastelloy® C-276 alloy plate, sheet, coil, bar, tubing and pipe are covered by ASME specifications SB-574, SB-575, SB-619, SB-622 and SB-626 under UNS number N10276.
Hastelloy® Nickel Alloy C-276 ASTM Specifications
| Plate, sheet | ASTM B 575 |
| Pipe, tube | ASTM B 622 / 626 / B 619 |
| Bar | ASTM B 462 |
| Forgings | ASTM B 564 |
| Fittings | ASTM B 366 |
Hastelloy® Availability
Mega Mex supplies Hastelloy® C-276 Alloy in the form of plate, sheet, strip, bar, wire, pipe, tubing, pipe fittings and flanges.
You will find our prices for Hastelloy® C-276 highly competitive.