Alloy 725
UNS N07725
Description
Alloy 725 is a nickel-chromium-molybdenum-niobium alloy which developed from Alloy 625 by adding strengthening elements to enhance its mechanical properties. It is highly resistant to corrosion and age hardenable for extremely high strength, and the strength of age hardened Alloy 725 is twice than that of Alloy 625 annealed. Strength in Alloy 725 is obtained by heat treatment and can also be cold worked for even higher strength. Due to outstanding corrosion resistance and high strength, the applications that require outstanding corrosion resistance along with high strength (such as hangers, landing nipples and high strength fasteners in marine applications) are good candidates for this alloy.
Chemical Component
| Ni | Cr | Mo | Nb | Ti | Fe | Al | C | Mn | Si | S | P |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 55.00-59.00% | 19.00-22.50% | 7.00-9.50% | 2.75-4.00% | 1.00-1.70% | Balance | 0.00-0.35% | 0.00-0.03% | 0.00-0.35% | 0.00-0.20% | 0.00-0.01% | 0.00-0.02% |
Basic Information
| Items | Alloy 725 |
|---|---|
| Catalog | ACMA-Ni-A014 |
| Density | 0.300 lb/in3 (8.31 g/cm3) |
| Hardness | 36 HRC |
| Electrical Resistivity | 1.144 µΩ.m |
| Poisson's Ratio | 0.31 |
| Melting Range | 2320-2449 °F (1271-1343 °C) |
Material Forms
Alfa Chemistry offers Alloy 725 in a variety of forms, including
- Pipe
- Tube
- Flanges
- Pipe Fittings
Mechanical & Physical Properties
| Properties | 21.1 °C | 93.3 °C | 148.9 °C | 204.4 °C | 315.6 °C | 371.1 °C | 426.7 °C | 537.8 °C | 648.9 °C | 982 °C |
|---|---|---|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength, Mpa | 1254 | 1230 | 1189 | 1170 | 1099 | 1096 | 1106 | 1068 | - | - |
| 0.2% Yield Strength, Mpa | 892 | 868 | 826 | 824 | 782 | 798 | 818 | 778 | - | - |
| Reduction of area, % | 48.4 | 47 | 50.2 | 52.4 | 54.2 | 53.4 | 49.6 | 47.7 | - | - |
| Elongation, % | 32 | 29.6 | 30.9 | 30.7 | 32.4 | 30.8 | 29.6 | 31 | - | - |
| Coefficient of Thermal Expansion, µm/m°C | - | 13 | - | 13.1 | 13.4 | 13.7 | - | 14.1 | 14.4 | - |
| Thermal Conductivity, kcal/(hr.m.°C) | 9.143 | 10.082 | 10.89 | 11.709 | 13.235 | 14.058 | 14.864 | 16.22 | 18.24 | 21.57 |
| Modulus of Elasticity, GPa | 204 | 200 | - | 194 | 188 | 182 | - | 177 | 169 | - |
Specifications
Pipe, Tube, Flanges, Pipe Fittings: ASTM B805, NACE MR0715
Applications
Alloy 725 can be used in a variety of applications, including:
- Tubing hangers for marine environments
- Landing nipples for marine environments
- Side pocket mandrels
- Polished bore receptacles in sour service environments
- Oil and gas hangers, connectors
- High strength fasteners for marine environments
- Pumps
- propeller shafts
- Chemical process equipment
- Downhole equipment for corrosive/sour service
* 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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