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Incoloy N08825 seamless pipe (UNS N08825, EN 2.4858) is a nickel-iron-chromium-molybdenum-copper alloy designed for exceptional resistance to a wide range of corrosive media, particularly in reducing environments. Composed of 42-46% nickel, 20-23% iron, 19.5-23.5% chromium, 2.5-3.5% molybdenum, 1.5-3% copper, and trace niobium, this alloy combines the benefits of nickel’s ductility with chromium-molybdenum-copper’s corrosion resistance. Conforming to standards like ASTM B423, ASME SB-423, and EN 10216-5, it is produced via seamless pilgering or extrusion to ensure tight dimensional tolerances and defect-free structures.
N08825 excels in resisting pitting, crevice corrosion, and stress-corrosion cracking (SCC) in chloride-rich solutions, making it a preferred choice for hostile chemical and marine environments where other alloys fail.
| Grade | Ni | Cu | Fe | Mn | C | Si | S |
| N02200 | ≥99.00 | ≤0.25 | ≤0.40 | ≤0.35 | ≤0.15 | ≤ 0.35 | ≤ 0.01 |
Broad Corrosion Resistance: Resistant to sulfuric acid (up to 50% concentration at 150°C), hydrochloric acid (up to 8% at 60°C), seawater, and chloride solutions, outperforming 316L and even some duplex steels in aggressive media.
High-Temperature Performance: Maintains mechanical properties from -196°C to 550°C, with excellent resistance to intergranular corrosion and oxidation in both reducing and weakly oxidizing conditions.
Low Magnetic Permeability & Thermal Conductivity: Suitable for applications requiring non-magnetic components (e.g., marine sensors) and efficient heat transfer in heat exchangers.
Superior Fabricability: Readily weldable with ERNiCrMo-3 filler metal, and formable via cold or hot working, though post-weld heat treatment is unnecessary unless specified for critical SCC environments.
Offshore Oil & Gas: Used in seawater injection systems, subsea pipelines, and gas sweetening units, resisting chloride-induced SCC and H2S corrosion in sour gas environments.
Chemical Processing: Handles sulfuric acid pickling baths, phosphate fertilizers, and organic solvents in reactors, evaporators, and pipelines.
Desalination Plants: Ideal for heat exchanger tubes in multi-stage flash (MSF) and reverse osmosis (RO) systems, enduring high-temperature seawater and brine.
Nuclear Industry: Employed in spent fuel pools and primary coolant systems due to its resistance to radiation-induced corrosion and low activation properties.
Q: Is N08825 suitable for hydrofluoric acid (HF) environments?
A:No, its copper content makes it susceptible to HF attack. Monel alloys (e.g., N05500) are better suited for HF service.
Q: How does N08825 compare to Inconel 625?
A:N08825 has lower nickel and molybdenum but higher iron and copper, making it more cost-effective for reducing environments, while Inconel 625 excels in oxidizing conditions and higher temperatures.
Q: Can N08825 be used in acidic soils?
A:Yes, it resists general corrosion and pitting in sulfide-rich soils, making it ideal for buried pipelines in chemically aggressive terrains.
Q: What is the maximum recommended temperature for N08825 in sulfuric acid?
A:It can handle up to 50% H2SO4 at 150°C in reducing conditions; higher concentrations or temperatures require nickel-based alloys like Hastelloy C-276.
