Hastelloy C-276 (UNS N10276 / W.Nr. 2.4819)
Hastelloy C-276 (UNS N10276 / W.Nr. 2.4819) is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures. This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.
Although there are several variations of the Hastelloy nickel alloys, Hastelloy C-276 is by far the most widely used.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| Hastelloy C-276 | NS3304 | – | Hastelloy C-276 | N10276 | NiMo15Cr15W | 2.4819 | – | NA 45 | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Co | Mo | W | V | Fe |
| Hastelloy C-276 | ≤0.01 | ≤0.08 | ≤1.00 | ≤0.04 | ≤0.03 | 14.5-16.5 | Bal | ≤2.5 | 15.0-17.0 | 3.0-4.5 | ≤0.35 | 4.0-7.0 |
Typical Physical and Mechanical Properties (RT, Solution annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HB |
| 8.89 | 1325-1370 | 760 | 363 | 62 | – |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | ASTM B462, ASME SB462, ASTM B564, ASME SB564, DIN 17752/17753/17754, ISO 9723/9724/9725
DIN 17752, ISO 9723 |
| Plate, Sheet and Strip | ASTM B575, ASME SB575, ASTM B906, ASME SB906, DIN 17750, ISO 6208 |
| Pipe and Tube | ASTM B622, ASME SB622, ASTM B619, ASME SB619, ASTM B626, ASME SB626, ASTM B751, ASME SB751, ASTM B775, ASME SB775, DIN 17751, ISO 6207 |
| Welding Product | AWS A5.14 ERNiCrMo-4, ASME Ⅱ SFA-5.14 ERNiCrMo-4, ASME Ⅸ F-No.43 |
| Others | ASTM B366, ASME SB366, DIN17744 |
Features
- Excellent corrosion resistance in reducing environments
- Exceptional resistance to strong solutions of oxidizing salts, such as ferric and cupric chlorides
- High nickel and molybdenum contents providing good corrosion resistance in reducing environments
- Low carbon content which minimizes grain-boundary carbide precipitation during welding to maintain resistance to corrosion in heat-affected zones of welded joints
- Resistance to localized corrosion such as pitting and stress-corrosion cracking
- One of few materials to withstand the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide
Applications
- Pollution control stack liners, ducts, dampers, scrubbers, stack-gas reheaters, fans and fan housings
- Flue gas desulfurization systems
- Chemical processing components like heat exchangers, reaction vessels, evaporators, and transfer piping
- Sour gas wells
- Pulp and paper production, Waste treatment
- Pharmaceutical and food processing equipment
