Materials / Superalloy
Hastelloy C-276
- UNS
- N10276
- W.Nr
- 2.4819
- EN
- NiMo16Cr15W
The reference nickel-molybdenum-chromium alloy for aggressive wet chemical service, and one of the few materials that handles both oxidising and reducing conditions without a change of grade.
Composition
| Element | Min | Max |
|---|---|---|
| Ni | — | bal |
| Mo | 15.0 | 17.0 |
| Cr | 14.5 | 16.5 |
| Fe | 4.0 | 7.0 |
| W | 3.0 | 4.5 |
| Co | — | 2.5 |
| Mn | — | 1.0 |
| V | — | 0.35 |
| C | — | 0.010 |
| Si | — | 0.08 |
Per cent by weight, to the governing standard.
- Ni59.3
- Mo16.0
- Cr15.5
- Fe5.5
- W3.8
Per cent by weight, at the midpoint of each specified window. Elements given only as a maximum have no midpoint to take, so they sit inside the balance rather than being estimated; trace elements below 0.5 % are not shown. Indicative only; the composition table above and the governing standard are what define the limits.
Mechanical
- Tensile strength, min
- 690 MPa
- Yield strength (0.2%), min
- 283 MPa
- Elongation, min
- 40 %
- Condition
- Solution annealed
Standards by form
| Plate, sheet & strip | ASTM B575 | |
|---|---|---|
| Pipe & tube | ASTM B622 | |
| Bar & rod | ASTM B574 | |
| Fittings | ASTM B366 |
Where it is specified
- Wet chlorine, hypochlorite, chlorine dioxide and ferric chloride
- Sour gas, flue gas desulphurisation, pulp and paper bleaching
- Very low carbon and silicon give excellent as-welded corrosion resistance
Molybdenum is the substitution tell on C-276
Molybdenum is the single most expensive element in the alloy, which puts the whole cost-down incentive on one number, and that number is invisible without measurement. Carbon is the second check: C-276's very low carbon ceiling is what gives it as-welded performance, and a heat over 0.010 % will sensitise at the weld.
What we specify and check
- PMI specified on the delivered heat, reading Mo against the 15.0–17.0 window
- Carbon verified against the 0.010 % maximum
- ASTM G28 method A intergranular corrosion testing where specified
- Solution anneal records confirmed
We commission an accredited independent laboratory to test the heat before the material leaves China. You will receive that report unedited, whether it passes or not.
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