Alloy 825 / 2.4858
Alloy 825 is a titanium-stabilized, fully austenitic nickel-iron-chromium alloy with additions of copper and molybdenum. Alloy 825 is characterized by:
- Approval for pressure vessels with operating temperatures up to 425 ° C
- good resistance to stress corrosion cracking
- good resistance to oxidizing and non-oxidizing hot acids
- good mechanical properties at both room and elevated temperatures up to 550 ° C
- satisfactory resistance to pitting and crevice corrosion
Material Data Sheet
| Material Designation | Alloy | EN Material Symbol | UNS | VdTÜV Datasheet | ISO |
|---|---|---|---|---|---|
| 2.4858 | Alloy 825 | NiCr21Mo | N 08825 | 432/1 | NiFe30Cr21Mo3 |
Main fields of application of alloy 825
Typical examples for the use of 825 are as follows:
- Chemical plants
- Air-cooled heat exchangers in LNG process (LPG)
- Heat exchangers, evaporators, scrubbers, fork tubes, in the phosphoric acid production
- Components in sulfuric acid pickling lines, such as heating coils, tanks, boilers, baskets and chains
- Fuel element for a variety of media, such as dissolver sulfuric and nitric acid, sodium hydroxide, etc., which are used in the recycling process
- Food preparation
- Seawater-cooled heat exchangers, offshore pipelines, pipes and parts in natural gas operation
Chemical composition of alloy 825
| C | Si | Mn | P | S | Cr | Mo | |
|---|---|---|---|---|---|---|---|
| % | 0.025 | 0.5 | 1.0 | 0.02 | 0.015 | 19.5-23.5 | 2.5-3.5 |
| Ni | Al | Co | Cu | Fe | Ti | B | |
|---|---|---|---|---|---|---|---|
| % | 38.0-46.0 | 0.2 | 1.0 | 1.5-3.0 | rest | 0.6-1.2 | 0-0.006 |
Characteristics of alloy 825
| Temperature Range | Density | Melting Range | Elongation at break of Alloy 825 | ISO-V notch impact toughness |
|---|---|---|---|---|
| up to 550°C | 8.1 g/cm³ | 1370°C – 1400°C | 30 % | ≥ 150 J/cm² at room temperature, lengthwise (only bars and forgings)<br />≥ 100 J/cm² at room temperature, across |
Filler metal (for welding with alloy 825)
Alloy 825 can be welded by all conventional methods.
The following welding is recommended:
WIG/MIG 2.4831 SG- NiCr21Mo9Nb
Filter Rod 2.4621 EL- NiCr20Mo9Nb
Delivery program
Sheets / Plates mm: 2 - 15
Precision strip mm: 0.2
With short delivery time:
Plates or sheets, tubes, flanges, forged or die-cut rings and round blanks, elbows, T-fittings, reductions, screws, nuts or washers according to your request. According to your individual wishes, we are able to cut our material with our plasma- or water jet cutter. Our material is stocked in superformats of 2000x6000mm. Cut to size on request.
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