Hastelloy® C-276
Hastelloy C-276 is a nickel-molybdenum-chromium superalloy with an addition of tungsten. It is designed to have excellent corrosion resistance in a wide range of severe environments. It is often considered the most versatile corrosion-resistant alloy available.
- Common Forms: Plate, Sheet, Pipe, Flanges, Bar, Wire.
- Key Feature: Resistant to wet chlorine, hypochlorite, and chlorine dioxide.
- Welding: Very low carbon/silicon ensures minimal grain boundary precipitation.
- Resistance: Exceptional resistance to strong solutions of oxidizing salts.
In harsh chemical processing environments where "upset" conditions are likely to occur, Hastelloy C-276 offers the best insurance. Its resistance to grain boundary precipitation in the heat-affected zone makes it suitable for most chemical process applications in the as-welded condition.
Wet Chlorine Resistance
One of the few materials that can withstand the corrosive effects of wet chlorine gas, hypochlorite, and chlorine dioxide.
Pitting & Crevice Corrosion
The high Molybdenum (15-17%) content provides outstanding resistance to localized corrosion (pitting) even in severe chloride environments.
Sour Gas Service
Excellent resistance to sulfide stress cracking and stress-corrosion cracking in sour gas environments (hydrogen sulfide).
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 57.0 min (Balance) |
| Molybdenum (Mo) | 15.0 - 17.0 |
| Chromium (Cr) | 14.5 - 16.5 |
| Iron (Fe) | 4.0 - 7.0 |
| Tungsten (W) | 3.0 - 4.5 |
| Manganese (Mn) | 1.0 max |
| Carbon (C) | 0.01 max |
*Note: The high Molybdenum and Tungsten content are critical for its resistance.
| Product Form | ASTM / ASME Standards |
|---|---|
| Plate, Sheet, Strip | ASTM B575, ASME SB575 |
| Pipe (Seamless) | ASTM B622, ASME SB622 |
| Pipe (Welded) | ASTM B619, ASME SB619 |
| Bar & Rod | ASTM B574, ASME SB574 |
| Fittings | ASTM B366, ASME SB366 |
| Forgings | ASTM B564, ASME SB564 |
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 100 - 115 ksi (690 - 795 MPa) |
| Yield Strength (0.2% Offset) | 40 - 55 ksi (275 - 380 MPa) |
| Elongation | 40 - 65 % |
| Hardness (Brinell) | 150 - 200 HB |
Pollution Control
Liners, ducts, dampers, scrubbers, stack-gas reheaters, and fans in Flue Gas Desulfurization (FGD) plants.
Chemical Processing
Heat exchangers, reaction vessels, evaporators, and transfer piping handling mixed acids and chlorides.
Pulp & Paper
Digesters and bleach plants handling chlorine dioxide and hypochlorite solutions.
Waste Treatment
Evaporators and crystallizers treating industrial and municipal waste streams.
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