UNS N08825
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Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional corrosion resistance in both oxidizing and reducing environments. The alloy is resistant to chloride stress-corrosion cracking and pitting. The addition of titanium stabilizes Alloy 825 against sensitization in the as-welded condition making the alloy resistant to intergranular attack after exposure to temperatures in a range that would sensitize unstabilized stainless steels.
Mechanical Properties
| Temper | Annealed | |
|---|---|---|
| Tensile Rm | 85 | ksi (min) |
| Tensile Rm | 590 | MPa (min) |
| R.p. 0.2% Yield | 35 | ksi (min) |
| R.p. 0.2% Yield | 240 | MPa (min) |
| Elongation (2" or 4D gl) | 30 | % (min) |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) | 440 | J.kg-1.°K-1 |
| Thermal Conductivity | 11.1 | W.m -1.°K-1 |
| Thermal Expansion | 14 | μm/μm/°C |
| Modulus Elasticity | 196 | GPa |
| Electrical Resistivity | 1.13 | Ohm-cm |
| Density | 8.13 | g/cm3 |
Chemical Composition (% by weight)
| Element | Min | Max |
|---|---|---|
| C | - | 0.05 |
| Si | - | 0.5 |
| Mn | - | 1 |
| P | - | 0.03 |
| S | - | 0.03 |
| Al | - | 0.2 |
| Cr | 19.5 | 23.5 |
| Cu | 1.5 | 3 |
| Fe | Balance | |
| Mo | 2.5 | 3.5 |
| N | 0.15 | 0.25 |
| Ni | 38 | 46 |
| Ti | 0.60 | 1.20 |
Weldability
Alloy 825 can be readily welded by the shielded metal-arc process using alloy welding electrode 135, the gas shielded arc processes using alloy filler metal 65, and the resistance welding processes. The alloy requires no postweld heat treatment. The corrosion resistance of deposited weld metal from both covered electrode and bare wire is equivalent to that of the parent metal.
Heat Treatment
Incoloy 825 is stabilise annealed at 940°C. The softest structure is obtained at 980°C. Sections heavier than sheet, strip and wire should be quenched to avoid sensitisation.
Corrosion Resistance
The outstanding property of Incoloy 825 is its corrosion resistance. In reducing & oxidising conditions, Incoloy 825 resists general corrosion, pitting & crevice corrosion, intergranular corrosion and stress corrosion cracking. It is particularly useful in sulphuric & phosphoric acids, sulphur containing flue gases, sour gas and oil wells and sea water.
Package&Delivery
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