Inconel 625
Inconel 625 is a nickel based alloy containing about 61% nickel, 21.5% chromium, 9% molybdenum, and 3.6% niobium. Solid solution strengthening gives it resistance to oxidizing acids, chloride solutions, seawater, organic acids, and stress corrosion cracking. The source lists continuous service up to 1093℃ and stable mechanical performance from -253℃ to 982℃, with fatigue and creep resistance. Applications include aircraft engine parts, gas turbine blades, offshore risers, subsea pipelines, chemical vessels, high pressure valves, and nuclear industry equipment.
Product details
Chemical composition
| inconel625 | C | Si | Mn | P | S | Ni | Cr | Mo | Co | Fe | Ti | Al | Nb+Ta |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 58.0 | 20.0 | 8.0 | – | – | – | – | 3.15 |
| max | 0.1 | 0.5 | 0.5 | 0.015 | 0.015 | – | 23.0 | 10.0 | 1.0 | 5.0 | 0.4 | 0.4 | 4.15 |
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Grade equivalents
| UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|
| N06625 | 2.4856 NiCr22Mo9Nb | NCF625 | NS336 NS3306 | NC22DNb |
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Physical properties
| Density g/cm³ | 8.44 |
|---|---|
| Melting range ℃ | 1290-1350 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 12.1 |
| Specific heat J/kg•℃ | 430 |
| Elastic modulus GPa | 205 |
| Shear modulus GPa | 79 |
| Electrical resistivity μΩ•m | 1.25 |
| Linear expansion coefficient a/10-6℃-1 | 12.3(20~100℃) |
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Mechanical properties
| Tensile strength Rm N/mm | ≥827 |
|---|---|
| Yield strength RP0.2 N/mm | ≥414 |
| Elongation % | ≥30 |
| Hardness HB | ≤220 |
| *After solution heat treatment | |
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Applications
- Jet-engine combustion chambers, turbine blades, and exhaust-system components
- Rocket-engine thrust chambers and nozzles
- Heat exchangers in seawater desalination equipment
- Ethylene cracking furnace tubes
- Seals for nuclear-reactor pressure vessels
- Superheaters in waste incinerators
- High-temperature, high-pressure piping in geothermal power plants
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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