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
Alloy 625 — Also Known As
Alloy 625 is also commonly 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.
Alloy 625 — Applicable Standards & Specifications
Alloy 625 is commonly supplied to ASTM B444, ASME SB444, ASTM B829, ASME SB829, ASTM B705, ASME SB705, ASTM B775, ASME SB775, ASTM B751, ASME SB751.
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