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Nickel Alloy 825 (UNS N08825) is a nickel-iron-chromium alloy containing additions of molybdenum and copper. This composition provides excellent resistance to both reducing and oxidizing acids, stress-corrosion cracking, and localized corrosion like pitting and crevice corrosion. The alloy's high nickel content makes it highly resistant to chloride stress-corrosion cracking, offering a significant advantage over conventional austenitic stainless steels. Furthermore, the molybdenum and copper additions improve its corrosion resistance in reducing environments. Here is an overview of Incoloy 625 steel plates UNS N08825 for ocean shipping.
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Incoloy 825 Plate N08825 Chemical Composition
|
Grade |
C |
Mn |
Si |
S |
Cu |
Fe |
Ni |
Cr |
Al |
Ti |
|
825 |
0.05 max |
1.00 max |
0.5 max |
0.03 max |
1.50 – 3.00 |
22.00 min |
38.00 – 46.00 |
19.50 – 23.50 |
0.02 max |
0.06 – 1.20 |
ASTM B424 Alloy 825 Plate Mechanical Properties
|
Element |
Density |
Melting Point |
Tensile Strength |
Yield Strength (0.2%Offset) |
Elongation |
|
no8825 material |
8.14 g/cm3 |
1400 °C (2550 °F) |
Psi – 80,000 , MPa – 550 |
Psi – 32,000 , MPa – 220 |
30 % |
Incoloy 825 Equivalent Material
|
Grade |
UNS No |
Old British |
Euronorm |
GOST |
Japanese JIS |
||
|
BS |
En |
No |
AFNOR |
||||
|
Incoloy 825 |
N08825 |
NA 16 |
NiCr21Mo |
2.4858 |
NFE30C20DUM |
--703 |
NCF 825 |
Available Incoloy Alloy N08825 Plate Thicknesses
|
3/16" |
1/4" |
3/8" |
1/2" |
5/8" |
3/4" |
|
4.8mm |
6.3mm |
9.5mm |
12.7mm |
15.9mm |
19mm |
|
1" |
1 1/4" |
1 1/2" |
1 3/4" |
2" |
|
|
25.4mm |
31.8mm |
38.1mm |
44.5mm |
50.8mm |
|
Unique Advantages of Incoloy 825
Incoloy 825 isn't just another alloy; its specific chemical composition is tailored to combat the multi-faceted challenges of marine applications.
1. Exceptional Resistance to Saltwater The high chromium content, combined with molybdenum, gives Alloy 825 outstanding resistance to pitting and crevice corrosion in chloride-rich seawater. This ensures the structural integrity of hulls, piping systems, and offshore platforms over a long service life.
2. Immunity to Stress Corrosion Cracking This is one of the most critical features of Incoloy 825. Its high nickel content makes it virtually immune to chloride-ion stress corrosion cracking. This provides a crucial safety and reliability advantage over 300-series stainless steels, which are known to be vulnerable to SCC in marine environments.
3. Versatility in Corrosive Environments The unique balance of its elements provides excellent resistance to both reducing and oxidizing acids.
The molybdenum and copper content make it highly resistant to reducing agents like sulfuric and phosphoric acids.
The chromium content provides resistance to oxidizing substances like nitric acid and nitrates.
This makes Incoloy 825 plates an ideal choice for the construction of chemical tankers, as they can safely handle a diverse range of corrosive cargoes without degradation.
4. Durability and Weldability Incoloy 825 is stabilized with titanium to prevent intergranular corrosion after welding. This ensures that the corrosion resistance of the material is not compromised during fabrication, allowing for the construction of complex and reliable structures like seawater cooling pipes, heat exchangers, and exhaust scrubbers.
Key Applications for Incoloy 825 in Ocean Shipping
Thanks to its robust properties, Incoloy 825 is specified for a wide range of critical marine applications:
Chemical Tanker Hulls and Tanks: Safely contains a variety of acidic and corrosive cargoes.
Seawater Piping and Cooling Systems: Resists corrosion and biofouling for reliable operation.
Offshore Oil & Gas Platforms: Used for risers, sheathing for undersea cables, and structural components exposed to the splash zone.
Marine Exhaust Gas Scrubbers: Withstands hot, acidic condensates created during the process of removing sulfur from ship exhaust.
Propeller and Pump Shafting: Offers the necessary strength and corrosion resistance for critical powertrain components.
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