Inconel 725 Alloy
General Characteristics of Inconel 725 Alloy
This is an age-hardening nickel-chromium-molybdenum-columbium alloy that is resistant to corrosion and capable of developing very high strength. The alloy is resistant to stress-corrosion cracking.
| Chemical Analysis | |
|---|---|
| C | Carbon 0.03 max |
| Mn | Manganese 0.35 max |
| Si | Silicon 0.35 max |
| P | Phosphorus 0.015 max |
| S | Sulfur 0.010 max |
| Cr | Chromium 19.00/22.50 |
| Ni | Nickel 55.00/59.00 |
Mo | Molybdenum 7.00/9.50 |
Ti | Titanium 1.00/1.70 |
Al | Aluminium 0.35 max |
Cb | Columbium 2.75/4.00 |
Applications
The alloy’s outstanding strength and corrosion resistance make it suitable for use as hangers, landing nipples, side-pocket mandrels and polished bore receptacles in sour gas service. Its resistance to sea water makes the alloy suitable for high strength fasteners in marine applications.
Forging
Forging is carried out between 2050/1650ºF (1120/900ºC). The work piece should be heated uniformly to forging temperature, allowed to soak for a short time and be forged. Light reductions should be used in the 1750/1650ºF (955/900ºC) range. Excessive heat build up should be avoided and forging should not be carried out below 1650ºF (900ºC).
Heat treatment
Solution annealing is carried out at 1900ºF (1040ºC) followed by air cooling.
Age hardening involves 8 hrs at 1350ºF (730ºC) followed by a furnace cool at 100ºF (55ºC) per hour to 1150ºF (620ºC) for 8 hrs and air cooling.
Machinability
The alloy is readily machined in the solution-annealed or aged conditions. Cemented carbide tools or high speed steel tools may be used, depending upon work to be carried out and final part requirements.
Weldability
Gas-tungsten-arc-welding and gas-metal-arc-welding are the preferred methods for welding alloy 725. Optimum properties are obtained by annealing the alloy prior to welding, then solution annealing and aging after welding.
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