Also known as: Alloy 625, 625 Alloy, Inconel 625 (UNS N06625) Seamless Pipes & Tubes, N06625, UNS N06625, 2.4856, Werkstoff 2.4856, W.Nr 2.4856, NiCr22Mo9Nb, inconel 625
Inconel 625 (UNS N06625) Seamless Pipes & Tubes
Alloy 625 (Inconel 625, UNS N06625) is a nickel-chromium-molybdenum alloy with niobium addition, providing exceptional strength and outstanding corrosion resistance across a wide range of temperatures. With PREN >50, it offers virtually complete immunity to pitting in seawater and the most aggressive chemical environments.
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 | Mo | Nb+Ta | Fe | C | Mn | Si | Al | Ti |
|---|---|---|---|---|---|---|---|---|---|
| 58.0 min | 20.0-23.0 | 8.0-10.0 | 3.15-4.15 | 5.0 max | 0.10 max | 0.50 max | 0.50 max | 0.40 max | 0.40 max |
Mechanical Properties (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 827 MPa min | 414 MPa min | 30% min | N/A |
Physical Properties - Alloy 625
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 8.44 g/cm3 | 1290-1350 C | 9.8 W/m-K | 1290 nOhm-m | 410 J/kg-K | 12.8 um/m-C |
Corrosion Resistance - Alloy 625
| Property | Value |
|---|---|
| Pitting Resistance (PREN) | >50 (exceptional) |
| Max Service Temp (Oxidizing) | 980 C |
| Intergranular Corrosion | Excellent (Nb stabilized) |
| Stress Corrosion Cracking | Outstanding |
| General Corrosion Rate | Virtually nil in most environments |
| Seawater Resistance | Outstanding - immune to pitting |
Equivalent International Grades
| ASTM | Trade | DIN |
|---|---|---|
| N06625 | Inconel 625 | 2.4856 |
Alloy 625 vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| Alloy 825Nickel-Iron-Chromium-Molybdenum Alloy | N08825 | 586 MPa min | 241 MPa min | ~31 | 540 C |
| Alloy C-276Nickel-Molybdenum-Chromium Alloy | N10276 | 690 MPa min | 283 MPa min | >70 (highest available) | 1093 C |
| Super Duplex 2507Super Duplex Stainless Steel | S32750 | 795 MPa min | 550 MPa min | >42 (typ. 42-44) | 315 C |
Applicable Standards
Applications
Key Advantages of Alloy 625
Alloy 625 Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Premium alloy for subsea, sour gas, and the most demanding corrosion applications. Used by ADNOC, Saudi Aramco, QatarEnergy.
Europe (Germany, UK, Norway, Netherlands, Italy)
Standard for subsea, aerospace, and nuclear applications in Norway, UK, France, and Germany.
United States
Used in aerospace, nuclear, subsea, and the most demanding chemical processing applications.
Frequently Asked Questions about Alloy 625 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 625 seamless pipes & tubes across the GCC, India, Europe and the USA. Contact our sales team for competitive pricing, fast delivery, and full material certification.
