Also 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, nicr21mo alloy 825
Incoloy 825 (UNS N08825) Seamless Pipes & Tubes
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.
Size Range
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness
SCH 5S to SCH 80S
Standards
4 specs
Chemical Composition (% by weight)
| 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 (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 586 MPa min | 241 MPa min | 30% min | N/A |
Physical Properties - Alloy 825
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 8.14 g/cm3 | 1370-1400 C | 11.1 W/m-K | 1130 nOhm-m | 440 J/kg-K | 14.0 um/m-C |
Corrosion Resistance - Alloy 825
| Property | Value |
|---|---|
| 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 |
Equivalent International Grades
| ASTM | Trade | DIN |
|---|---|---|
| N08825 | Incoloy 825 | 2.4858 |
Alloy 825 vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| SS 904LAustenitic Stainless Steel | N08904 | 490 MPa min | 220 MPa min | ~36 | 450 C |
| Alloy 625Nickel-Chromium-Molybdenum Alloy | N06625 | 827 MPa min | 414 MPa min | >50 (exceptional) | 980 C |
| Alloy C-276Nickel-Molybdenum-Chromium Alloy | N10276 | 690 MPa min | 283 MPa min | >70 (highest available) | 1093 C |
Applicable Standards
Applications
Key Advantages of Alloy 825
Alloy 825 Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Standard for sour gas handling, downhole tubing, and acid service in UAE, Saudi Arabia, Kuwait, and Qatar oil fields.
Europe (Germany, UK, Norway, Netherlands, Italy)
Used in chemical processing, nuclear, and offshore applications in UK, France, Germany, and Norway.
United States
Widely specified for acid handling, sour gas, and pollution control applications.
Frequently Asked Questions about Alloy 825 Seamless Pipes & Tubes
Quick Specifications
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
SCH 5S to SCH 80S
Industries Served
Related Grades
Compare With
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Stancor Tubular Products supplies Alloy 825 seamless pipes & tubes across the GCC, India, Europe and the USA. Contact our sales team for competitive pricing, fast delivery, and full material certification.
