2.4858
- N08825
- Incoloy 825
Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing.
Mechanical Properties
| Tensile strength: | 585 | N/mm² |
| Yield strength 0,2% : | 240 | ≥ N/mm² |
| Elongation: | 30 | ≥ % |
| Hardness HB30: | 135-165 | ≤ HB |
Chemical Composition
Nickel
Ni
38-46% min
Carbon
C
0,05% max
Silicon
Si
0,5% max
Magnese
Mn
1,0% max
Sulphur
S
0,03% max
Copper
Cu
1,5-3% max
Molybdenum
Mo
2,5-3,5% max
Chromium
Cr
19,5-23,5% max
Heat Treatment
920-980°C followed by water quenching
The nickel content of Alloy 825 makes it resistant to chloride stress-corrosion cracking, and combined with molybdenum and copper, provides substantially improved corrosion resistance in reducing environments when compared to conventional austenitic stainless steels. The chromium and molybdenum content of Alloy 825 provides resistance to chloride pitting, as well as resistance to a variety of oxidizing atmospheres. The addition of titanium stabilizes the alloy against sensitization in the as-welded condition. This stabilization makes Alloy 825 resistant to intergranular attack after exposure in the temperature range which would
typically sensitize un-stabilized stainless steels. Alloy 825 is resistant to corrosion in a wide variety of process environments including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions.
The fabrication of Alloy 825 is typical of nickel-base alloys, with material readily formable and weldable by a variety of techniques.
Marking
All material will be marked as follow:
- Manufacturer’s name
- Material grade
- Size
- Heat Number
Certification
Material will be delivered with certificate EN 10204 3.1
