Incoloy 925
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Incoloy Alloy 925 (UNS N09925) is an agehardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum.The nickel content is sufficient for protection against chloride-ion stress corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing chemicals. The molybdenum aids with the resistance to pitting and crevice corrosion. The alloy's chromium content provides resistance to oxidizing environments. The titanium and aluminum additions cause a strengthening reaction during heat treatment.
Incoloy Alloy 925 Chemical Composition
| % | Ni | Cr | Fe | Mo | Cu | Ti | Al | Mn | Si | Nb | C | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 42 | 19.55 | 22 | 2.5 | 1.5 | 1.9 | 0.1 | - | - | - | - | - |
| Max | 46 | 22.5 | - | 3.5 | 3 | 2.4 | 0.5 | 1 | 0.5 | 0.5 | 0.03 | 0.03 |
Nickel Incoloy 925 Physical Properties
| Density,g/cm3 | Melting Range ,°C | Electrical Resistivity,μΩ-m | Permeability at 200 oersted (15.9 kA/m) |
|---|---|---|---|
| 8.08 | 1311-1366 | 1.17 | 1.001 |
Incoloy 925 Mechanical Properties
| Form/Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness |
|---|---|---|---|---|
| MPa | MPa | % | Rockwell | |
| Round/Solution-Annealed | 685 | 271 | 56 | 76 B |
| Round/Solution-Annealed and Aged | 1154 | 832 | 27 | 32 C |
| Cold Drawn Tubing/Solution-Annealed and Aged | 1189 | 830 | 27 | 35 C |
Corrosion Resistance
Incoloy Alloy 925 has a high level of corrosion resistance. The alloy resists total corrosion, pitting corrosion, crevice corrosion, intergranular corrosion and stress corrosion cracking in both reducing and oxidizing environments. Some environments in which Incoloy 925 is particularly useful are "acidic" (H2S-containing) crude oil and natural gas, sulfuric acid, phosphoric acid, and seawater. The test involves exposing a pressed C-ring sample (made from part of a cross section of a pipe) to a solution containing hydrogen sulphide, sodium chloride and acetic acid.
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