Alloy 625
UNS N06625
Description
Alloy 625 is a nickel-chromium-molybdenum-niobium alloy with high strength, outstanding aqueous corrosion resistance and superb weldability. The strength of Alloy 625 is primarily a solid solution effect from molybdenum and columbium. The combination of the alloyed elements in Alloy 625 gives it to withstand a wide variety of severe corrosive environments and there is almost no attack in mild environments, such as fresh and seawater, neutral pH environments, and alkaline media. In addition, it has the characteristics of high tensile, creep and rupture strength, outstanding fatigue and thermal-fatigue strength, as well as good oxidation resistance. Alloy 625 is the alloy of choice for weld overlay applications in the oil and gas/petrochemical and refineries markets and it also has wide use in aerospace as well as marine industries.
Chemical Component
| Ni | Cr | Mo | Co | Nb+Ta | Fe | Al | C | Ti | Mn | Si | S | P |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance | 20-23% | 9-10% | 1% max | 3.15-4.15% | 5.0% max | 0.4% max | 0.1% max | 0.4% max | 0.5% max | 0.5% max | 0.015% max | 0.015% max |
Basic Information
| Items | Alloy 625 |
|---|---|
| Catalog | ACMA-Ni-A012 |
| Density | 8.442 g/cm3 |
| Electrical Resistivity | 775 ohm·circ mil/ft |
| Poisson's Ratio | 0.308 |
| Magnetic Permeability H= 200 Oersted | Annealed: 1.0006 |
| Melting Point | 1287-1348 °C |
Material Forms
Alfa Chemistry offers Alloy 625 in a variety of forms, including
- Pipe,
- Coil
- Welding Wire
- Sheet & Plate
- Round Bar
- Pipe Fittings
- Flanges
Mechanical & Physical Properties
| Properties | 21 °C | 204 °C | 316 °C | 427 °C | 538 °C | 649 °C | 760 °C | 871 °C |
|---|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength, Mpa | 992.9 | 923.9 | 910.1 | 910.1 | 896.3 | 820.5 | 537.8 | 275.8 |
| 0.2% Yield Strength, Mpa | 579.2 | 455.1 | 434.4 | 420.6 | 420.6 | 413.7 | 406.8 | 268.9 |
| Elongation, % | 44 | 45 | 42.5 | 45 | 48 | 34 | 59 | 117 |
| Coefficient of Thermal Expansion, µm/m°C | - | 13..1 | 13.3 | 13.7 | 14 | 14.8 | 15.3 | 15.8 |
| Thermal Conductivity, kcal/(hr.m.°C) | 8.5 | 10.7 | 12.2 | 13.5 | 15 | 16.4 | 17.9 | 19.6 |
| Modulus of Elasticity, GPa | 2.07 | 1.93 | 1.93 | 1.86 | 1.79 | 1.65 | 1.59 | - |
Specifications
Applications
Alloy 625 can be used in a variety of applications, including:
- Aircraft ducting and exhaust systems
- Engine thrust-reverser systems
- Turbine shroud rings
- Bellows, expansion joints
- Gaskets and damper seals
- Seawater applications
- Chemical processing and pollution control equipment
- Motorsport exhaust and clamps
- Weld overlay and spacers for heat recovery systems
- Furnace muffles
- Valve seats and components
- Marine Components
- Nuclear water reaction components
Among the many applications, Alloy 625 is most suitable for aerospace industry.
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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Alfa Chemistry is a manufacturer of standard & custom specialty metals & alloys. We stock a wide variety of alloys in different shapes and specifications. If you can't find the product or specification you need, please contact us directly.
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