Incoloy 825 Pipe manufacturer supplier. Contact us to get free quote and sample!
Incoloy 825 pipes have a unique composition design, strict manufacturing process and all-round excellent performance, making it the cornerstone of safety and efficiency in key areas such as energy development, heavy chemical industry, and marine engineering. We provide a diverse selection of astm b423 uns n08825 pipes, flanges, plates, pipe fittings, and round bars in various types and sizes. If you need additional information about our products or pricing, please feel free to get in touch with us.
Why Choose Alloy 825 pipe?
Chemical Composition of alloy 825
- High nickel content (38-46%): provides the fundamental guarantee for resistance to reducing media (such as sulfuric acid and phosphoric acid) and stress corrosion cracking, and is the key to alkali corrosion resistance.
- Key chromium content (19.5-23.5%): gives the alloy excellent corrosion resistance in oxidizing environments (such as nitric acid, atmosphere, and acids containing oxidants), forming a stable passivation film.
- Molybdenum (2.5-3.5%): significantly improves the ability to resist pitting and crevice corrosion, especially in chloride ion environments, and enhances corrosion resistance in reducing acids.
- Copper (1.5-3.0%): significantly enhances the corrosion resistance of the alloy in reducing acids (especially sulfuric acid and sulfurous acid).
- Titanium (0.6-1.2%): Combined with carbon to form stable titanium carbide, it effectively prevents sensitized intergranular corrosion and ensures safety in welding and high-temperature service.
uns n08825 pipe wide corrosion resistance
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Acid environment: Excellent performance in sulfuric acid and phosphoric acid at medium concentrations and temperatures (thanks to Ni-Cu synergy), resistant to nitric acid and acetic acid, stable to organic acids.
- Deadly chlorides: The ability to resist pitting and crevice corrosion far exceeds that of 316L (thanks to high Mo and Cr), and it is the first choice for seawater, salt spray, and chlorine-containing process media.
- Stress corrosion cracking: The high nickel content makes it have excellent resistance in hot concentrated chloride and caustic solutions.
- Localized corrosion: The high PREN value (>30) ensures its safety in harsh environments.
- High temperature oxidation/carburization: Good chromium content provides antioxidant ability, and the nickel base resists carburization.
incoloy n08825 Manufacturing and Forming
inco 825 Smelting and Casting
- Vacuum induction melting or electroslag remelting technology is used to minimize impurity elements (such as S, P, Pb) and improve purity and uniformity.
- Precisely control the pouring temperature and cooling rate to optimize the cast structure and reduce segregation.
n08825 tube Hot Processing
- The steel ingot is forged and blanked to refine the grains and improve the internal structure.
- Hot extrusion is the core process for manufacturing large-diameter thick-walled seamless pipes. The blank is formed through a die under high temperature and high pressure, and the material has good density.
incoloy 825 material Cold Processing and Forming
- Cold rolling/cold drawing is used to produce high-precision, small-diameter thin-walled seamless pipes, which significantly improves dimensional accuracy, surface finish and strength.
- Large-diameter pipes can be formed by welding, using matching 825 welding wire (such as ERNiCrMo-3), combined with TIG or plasma welding, to ensure that the weld composition and performance are consistent with the parent material.
- Pipe fittings manufacturing requires professional hot bending or cold bending technology to avoid cracking.
incoloy 825 steel pipe Key heat treatment
- Solution annealing (~900-1000°C): dissolve harmful phases such as carbides and σ phases formed during processing, restore complete austenite structure, and maximize corrosion resistance and toughness.
- Rapid water cooling: ensure that carbides, etc. will not re-precipitate and keep the material in the best condition.
