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Haynes 25 is a cobalt-based alloy which combines good formability and excellent high-temperature properties. At 1800°F, Haynes 25 sheet has a 100 hour stress-rupture strength of 7000 psi. The alloy is resistant to oxidation and carburization to 1900°F. Haynes 25 has given good service in many jet engine parts. Some of these include turbine blades, combustion chambers, afterburner parts, and turbine rings. The alloy has also been used successfully in a variety of industrial furnace applications including furnace muffles and liners in critical spots in high temperature kilns.
Chemical composition(mass fraction)(wt.%) of the HS 25
| Elements | Min.（≥） | Max.（≤） |
|---|---|---|
| C | 0.05 | 0.15 |
| Mn | 1.00 | 2.00 |
| P | - | 0.40 |
| S | - | 0.03 |
| Si | - | 0.40 |
| Cr | 19.00 | 21.00 |
| Ni | 9.00 | 11.00 |
| Co | - | Bal |
| Fe | - | 3.0 |
| W | 14.00 | 16.00 |
Mechanical properties of grade HS 25
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | HBW |
|---|---|---|---|---|---|---|
| 399 (≥) | 942 (≥) | 41 | 41 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 221 |