Inconel 625 (UNS N06625) Seamless Pipes & Tubes Manufacturer & Supplier
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.
UNS: N06625 | Category: Nickel-Chromium-Molybdenum Alloy | Werkstoff Nr: 2.4856 | EN Name: NiCr22Mo9Nb
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 | 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
- Tensile Strength
- 827 MPa min
- Yield Strength
- 414 MPa min
- Elongation
- 30% min
- Hardness
- N/A
Physical Properties
- Density
- 8.44 g/cm3
- Melting Range
- 1290-1350 C
- Thermal Conductivity
- 9.8 W/m-K
- Electrical Resistivity
- 1290 nOhm-m
- Specific Heat
- 410 J/kg-K
- Coeff. of Thermal Expansion
- 12.8 um/m-C
Corrosion Resistance
- 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
Applicable Standards
- ASTM B444 / ASME SB444
- ASTM B163 / ASME SB163
- ASTM B704 / ASME SB704
- DIN 17751
Applications
- Subsea umbilicals and flowlines
- Aerospace exhaust systems and turbine components
- Chemical reactor vessels
- Nuclear waste processing
- Flue gas desulfurization
- Seawater equipment and marine hardware
Industries Served
- Oil & Gas
- Aerospace
- Nuclear
- Chemical Processing
- Marine
Key Advantages
- PREN >50 - virtually immune to pitting and crevice corrosion
- Outstanding strength from cryogenic to 980C
- Excellent fatigue and thermal fatigue resistance
- Nb-stabilized for intergranular corrosion resistance
- Approved for the most critical subsea applications
- Exceptional resistance to chloride and acid environments
Equivalent Grades
- ASTM
- N06625
- Trade
- Inconel 625
- DIN
- 2.4856