Alloy 825
UNS N08825
Description
Alloy 825 is an austenitic nickel-iron-chromium grade with additions of molybdenum, copper and titanium, which is the forerunner of many of the molybdenum containing nickel iron chromium alloys. The high nickel content ensures resistance to stress corrosion cracking, addition of molybdenum and copper provides alloy with strongly resist reducing environments such as sulphuric and phosphoric acids, chromium provides alloy with oxidising resistance environments such as nitric acid, and the titanium content ensures inhibition of intergranular corrosion, and overall resistance to pitting and crevice corrosion. Thus, the alloy has excellent corrosion resistance, and it is suitable for those environments that require excellent corrosion resistant alloys.
Chemical Component
| Ni | Cr | Ti | Al | Cu | Mo | Fe | C | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 38-46% | 19.5-23.5% | 0.6-1.2% | 0-0.2% | 1.5-3% | 2.5-3% | Balance | 0-0.05% | 0-1% | 0-0.5% | 0-0.020% | 0-0.010% |
Basic Information
| Items | Alloy 825 |
|---|---|
| Catalog | ACMA-Ni-A018 |
| Density | 8.14 g/cm3 |
| Specific Heat Capacity | 440 J/kg.°C |
| Electrical Resistivity | 1.13 µΩ.m |
| Poisson's Ratio | 0.29-0.34 |
| Melting Range | 1370-1400 °C |
Material Forms
Alfa Chemistry offers Alloy 825 in a variety of forms, including
- Pipe
- Round Bar
- Sheet & Plate
- Pipe Fittings
- Flanges
Mechanical & Physical Properties
| Properties | 21.1°C | 93.3 °C | 148.9 °C | 204.4 °C | 315.6 °C | 371.1 °C | 426.7 °C | 537.8 °C | 684.9 °C | 982 °C |
|---|---|---|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength, MPa | 585 | 530 | 525 | 515 | 500 | 495 | 485 | - | - | -- |
| 0.2% Yield Strength, MPa | 240 | 205 | 190 | 180 | 170 | 165 | 155 | - | - | - |
| Elongation, % | 30 | - | - | - | - | - | - | - | - | - |
| Coefficient of Thermal Expansion, µm/m°C | - | 14.1 | 14.1 | 14.8 | 15.3 | 15.6 | 15.6 | 15.8 | - | - |
| Thermal Conductivity, kcal/(hr.m.°C) | 9.55 | 10.578 | 10.578 | 11.868 | 13.224 | 14.534 | 14.534 | 15.652 | - | - |
| Modulus of Elasticity, GPa | 196 | 192 | 192 | 187 | 181 | 174 | 174 | 168 | 162 | 118 |
Specifications
Applications
Alloy 825 can be used in a variety of applications, including:
- Fuel element dissolvers
- Sea-water-cooled heat exchangers; offshore product piping systems; tubes and components in sour gas service
- Heat exchangers, evaporators, scrubbers, dip pipes etc. in phosphoric acid production
- Air-cooled heat exchangers in petroleum refineries
- Chemical and Food Processing
- Pollution control
- Oil and gas recovery
- Nuclear fuel processing
Among the many applications, Alloy 825 is most suitable for petrochemical & refinery sector.
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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