INCOLOY® alloy 825 (UNS N08825 / W.Nr. 2.4858) is a nickel-iron-chromium alloy engineered for exceptional corrosion resistance in a wide range of demanding environments. The chemical composition of this nickel-based alloy, fortified with molybdenum, copper, and titanium, provides superior performance against reducing acids like sulfuric and phosphoric, as well as oxidizing media such as nitric acid. INCOLOY 825 offers proven resistance to chloride-induced stress-corrosion cracking, pitting, and crevice corrosion, while its titanium stabilization ensures immunity to intergranular attack. This combination of properties makes UNS N08825 a premier material for critical applications across chemical processing, pollution control, and offshore oil and gas industries.
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Incoloy 825 Features
Incoloy 825 (Nickel Alloy 825 or UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It is high Nickel content material with minimum Ni 38% to 46%, combined with small value of Mo, Cu and Ti gives Incoly 825 enhanced corrosion resistance to many corrosive environments. It is similar to alloy 800 but has improved resistance to aqueous corrosion. Alloy 825 is especially resistant to sulfuric and phosphoric acids
Density 8.14 g/cm3, 0.294 lbs/in3, tensile Strength 586 Mpa (85 Ksi) minimum, yield strength 241 Mpa (35Ksi) minimum, It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to locized attach such as pitting and crevice corrosion.
The higher comprehensive performance of Incoloy 825 is showed in nuclear combustion dissolvers with various corrosive media environment, such as sulfuric acid, nitric acid and sodium hydroxide mixed and processed in the same equipment.
Common Trade Names: Incoloy 825, Alloy 825, Nickelvac 825, Nicrofer 4241, UNS N08825, W.Nr. 2.4858
Chemical Composition of Incoly 825, Nickel Alloy 825 and UNS N08825
|
Weight % |
Ni |
Fe |
Cr |
Mo |
Cu |
Ti |
C |
Mn |
S |
Si |
Al |
|
Alloy 825 |
38 - 46 |
22 min |
19.5 - 23.5 |
2.5 - 3.5 |
1.5 - 3 |
0.6 - 1.2 |
0.05 max |
1 max |
0.03 max |
0.5 max |
0.2 max |
Mechanical Properties
|
Material |
Form and Condition |
Tensile Strength MPa |
Yield Strength (0.2% Offset) MPa |
Elongation (%) |
|
Alloy 825 Tube |
Annealed |
772 |
441 |
36 |
|
Alloy 825 Tube |
Cold Drawn |
1000 |
889 |
15 |
|
Alloy 825 Bar |
Annealed |
690 |
324 |
45 |
|
Alloy 825 Plate |
Annealed |
662 |
338 |
45 |
|
Alloy 825 Sheet |
Annealed |
758 |
421 |
39 |
Available Products and Specifications
INCOLOY Alloy 825 is designated as UNS N08825 and Werkstoff Number 2.4858. It is listed in NACE MR0175 for oil and gas service. Alloy 825 is available as pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire.
Rod, Bar, Wire and Forging Stock - BS 3076NA16, ASTM B 425, ASTM B 564, ASME SB 425, ASME SB 564, ASME Code Case N-572, DIN 17752, DIN 17753, DIN 17754, VdTÜV 432, ISO 9723, ISO 9724, ISO 9725
Plate, Sheet and Strip - BS 3072NA16, BS 3073NA16, ASTM B 424, ASTM B 906, ASME SB 424, ASME SB 906, DIN 17750, VdTÜV 432, ISO 6208
Pipe and Tube - BS 3074NA16, ASTM B 163, ASTM B 423, ASTM B 704, ASTM B 705, ASTM B 751, ASTM B 775, ASTM B 829, ASME SB 163, ASME SB 423, ASME SB 704, ASME SB 705, ASME SB 751, ASME SB 775, ASME SB 829, ASME Code Case 1936, DIN 17751, VdTÜV 432, ISO 6207
Others - ASTM B 366, ASME SB 366, DIN 17744
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