Incoloy™ 825 Alloy
General Characteristics of Incoloy™ 825 Alloy
Incoloy 825 alloy is a nickel-iron-chromium alloy with added molybdenum, copper and titanium. This alloy composition leads to very good resistance to many corrosive environments, most notably stress-corrosion cracking, reducing and oxidizing environments, and to pitting and crevice corrosion.
| Chemical Analysis | |
|---|---|
| C | Carbon 0.05 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 1.50/3.005 |
| Ti | Titanium 0.15 – 0.25 |
| Al | Aluminium 0.20 max/td> |
| Fe | Iron 22.00 min |
Applications
Applications include chemical processing, pollution control, oil and gas
recovery, acid production, pickling operations, nuclear fuel reprocessing, and handling of radioactive wastes.
Forging
The forging temperature range for this alloy is 2150/1600ºF (1180/870ºC). Optimum corrosion resistance is obtained when finish forging is carried out between 1800/1600°F (980/870ºC). Forgings should be cooled in air or faster.
Heavy sections may be susceptible to intergranular corrosion, hence a stabilizing anneal should be carried out on such forged parts.
Heat treatment
A stabilizing anneal is carried out in the temperature range 1700/1800ºF (930/980ºC), followed by rapid cooling, to provide optimum corrosion resistance and mechanical properties.
Machinability
The alloy is readily machined, preferably in the annealed condition. The usual recommendations for high-nickel alloys apply, namely positive feeds, slow speeds and rigid tools and equipment.
Weldability
Incoloy alloy 825 is readily welded by all conventional methods. Advice should be taken from the supplier on the electrodes and filler metal to be used.
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