ASTM B423 UNS N08825 / DIN 2.4858 Seamless Pipe Inconel825 Nickel Alloy Pipe
ASTM B423 UNS N08825 / Incoloy 825 Nickel Alloy Seamless Pipe
Chemical Composition of ASTM B423 Incoloy 825 Nickel Alloy Seamless Pipe
| Element | % | Element | % |
| Nickel | 38.0 – 46.0 | Carbon | 0.05 max |
| Chromium | 19.5 – 23.5 | Manganese | 1.0 max |
| Molybdenum | 2.5 – 3.5 | Sulfur | 0.03 max |
| Copper | 1.5 – 3.0 | Silicon | 0.5 max |
| Titanium | 0.6 – 1.2 | Aluminium | 0.2 max |
| Iron | 22.0 min (~33%) |
ASTM specifications for Incoloy Alloy 825.
| Specification | Title |
| B163 | Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes |
| B423 | Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221)* Seamless Pipe and Tube |
| B424 | Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Plate, Sheet, and Strip |
| B425 | Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825) |
| B704 | Welded UNS N06625 and UNS N08825 Alloy Tubes |
| B705 | Nickel-Alloy (UNS N06625 and N08825) Welded Pipe |
| B751 | General Requirements for Nickel and Nickel Alloy Welded Tube |
Mechanical Property of Incoloy 825 Nickel Alloy
| Form | Condition | 0.2% Proof Stress MPa |
Tensile Strength MPa |
Elong % |
| Tube | Annealed | 440 | 770 | 35 |
| Tube | Cold drawn | 880 | 1000 | 15 |
| Bar | Annealed | 325 | 690 | 45 |
| Plate | Annealed | 340 | 660 | 45 |
| Sheet | Annealed | 420 | 760 | 39 |
Key Properties & Corrosion Resistance
Incoloy 825 is designed to provide exceptional resistance to:
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Reducing acids (Sulfuric and Phosphoric acid).
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Oxidizing acids (Nitric acid, Chromic acid).
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Chloride Stress Corrosion Cracking (SCC) – Superior to 300 series stainless steels.
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Pitting and Crevice corrosion (due to Mo, Cu, and Ti content).
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Sour gas environments (NACE MR0175 / ISO 15156 compliant for H₂S).
Application
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Because of its high strength and corrosion resistance, the seamless pipe is used in:
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Oil & Gas: Downhole tubing, sour gas service, surface flow lines.
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Chemical Processing: Sulfuric acid plants, phosphoric acid evaporators, pickling tanks.
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Pollution Control: Scrubber components in coal-fired power plants.
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Marine: Offshore platforms (seawater handling).
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Nuclear Fuel Reprocessing.
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