Incoloy 825 (UNS N08825) Seamless Pipes & Tubes Manufacturer & Supplier
Alloy 825 (Incoloy 825, UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. It provides excellent resistance to both reducing and oxidizing acids, stress corrosion cracking, and pitting. It is widely used in oil & gas sour service and acid handling.
UNS: N08825 | Category: Nickel-Iron-Chromium-Molybdenum Alloy | Werkstoff Nr: 2.4858 | EN Name: NiCr21Mo
Alloy 825 — Also Known As
Alloy 825 is also commonly known as Alloy 825, 825 Alloy, Incoloy 825 (UNS N08825) Seamless Pipes & Tubes, N08825, UNS N08825, 2.4858, Werkstoff 2.4858, W.Nr 2.4858, NiCr21Mo, incoloy 825.
Alloy 825 — Applicable Standards & Specifications
Alloy 825 is commonly supplied to ASTM B423, ASME SB423, ASTM B704, ASME SB704, ASTM B705, ASME SB705, ASTM B829, ASME SB829.
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 80S
Chemical Composition (%)
| Ni | Cr | Fe | Mo | Cu | Ti | C | Mn | Si |
|---|---|---|---|---|---|---|---|---|
| 38.0-46.0 | 19.5-23.5 | 22.0 min | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | 0.05 max | 1.00 max | 0.50 max |
Mechanical Properties
- Tensile Strength
- 586 MPa min
- Yield Strength
- 241 MPa min
- Elongation
- 30% min
- Hardness
- N/A
Physical Properties
- Density
- 8.14 g/cm3
- Melting Range
- 1370-1400 C
- Thermal Conductivity
- 11.1 W/m-K
- Electrical Resistivity
- 1130 nOhm-m
- Specific Heat
- 440 J/kg-K
- Coeff. of Thermal Expansion
- 14.0 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- ~31
- Max Service Temp (Oxidizing)
- 540 C
- Intergranular Corrosion
- Excellent (Ti stabilized)
- Stress Corrosion Cracking
- Excellent resistance
- General Corrosion Rate
- <0.05 mm/yr in sulfuric acid
- Seawater Resistance
- Excellent
Applicable Standards
- ASTM B423 / ASME SB423
- ASTM B163 / ASME SB163
- ASTM B705 / ASME SB705
- DIN 17751
Applications
- Sour gas (H2S) handling in oil & gas
- Sulfuric acid pickling systems
- Phosphoric acid evaporators
- Nuclear fuel reprocessing
- Marine and seawater systems
- Pollution control equipment
Industries Served
- Oil & Gas
- Chemical Processing
- Nuclear
- Marine
- Pollution Control
Key Advantages
- Exceptional resistance to reducing acids (sulfuric, phosphoric)
- Excellent SCC resistance in sour gas (H2S) environments
- Titanium stabilization prevents intergranular corrosion
- Copper addition improves resistance to reducing acids
- Cost-effective alternative to higher-nickel alloys like C-276
Equivalent Grades
- ASTM
- N08825
- Trade
- Incoloy 825
- DIN
- 2.4858