Incoloy™ 925 Alloy
General Characteristics of Incoloy™ 925 Alloy
Alloy 925 is a high-strength, age-hardening, corrosion-resistant Ni-Fe-Cr alloy. Copper, titanium, molybdenum and aluminum additions, in conjunction with nickel, impart excellent resistance to stress-corrosion cracking, pitting and crevice corrosion, and to oxidizing and reducing environments.
| Chemical Analysis | |
|---|---|
| C | Carbon 0.03 max |
| Mn | Manganese 1.00 max |
| S | Sulfur 0.030 max |
| Si | Silicon 0.50 max |
| Cr | Chromium 19.50/23.50 |
| Ni | Nickel 38.00/46.00 |
| Mo | Molybdenum 2.50/3.50 |
| Cu | Copper 1.50/2.50 |
| Ti | Titanium 1.90/2.40 |
| Cb | columbium 0.50 max |
| Al | Aluminium 0.10/0.50 |
| Fe | Iron 22.00 min |
Applications
The high strength and corrosion resistance of this alloy make it suitable for down hole and surface gas-well components, shafting products and fasteners.
Forging
The alloy may be forged in the range 2150/1600ºF (1175/870ºC). Maximum strength and corrosion resistance are obtained from forging in the 1800/1600ºF range (980/870ºC).
Heat treatment
Solution treatment is carried out in the range 1800/1900ºF (980/1040ºC) for 30 minutes to 4 hours-depending upon section size- followed by water quenching. This treatment is followed by an aging treatment at 1365ºF (740ºC) for 8 hours, furnace cooling to 1150ºF (620ºC), holding for 6 hours and air cooling.
Machinability
The alloy has good machinability in both the solution-treated and aged conditions. All should be done to minimize work hardening. Rough machining between solution treatment and aging results in the best finished parts.
Weldability
Alloy 925 should be welded using gas-tungsten-arc welding, with filler materials of base-metal composition.
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