Materials · Inconel
Inconel 625 fasteners
HAGUE FASTENERS makes Inconel 625 fasteners to order: bolts, studs, nuts and machined parts in Inconel 625 (UNS N06625), made to your drawing from certified, traceable bar. A nickel-chromium-molybdenum alloy for seawater, chlorides and high temperature.
UNS N06625
Also W.Nr. 2.4856 and BS 3076 NA 21
827 to 1034 MPa
Tensile strength, annealed
8 to 10% Mo
Molybdenum for pitting resistance
1 to 500
Single prototypes to batches of several hundred
About the alloy
The standard nickel alloy for seawater
HAGUE FASTENERS makes Inconel 625 fasteners in the UK for subsea, offshore, chemical and power plant. Alloy 625 is a nickel-chromium-molybdenum alloy with niobium, and its excellent resistance to pitting and crevice corrosion makes it a standard choice for seawater service.
Its strength comes from molybdenum and niobium in solid solution, so it does not need an ageing treatment to reach useful properties, and it combines that strength with oxidation resistance at temperature. Where still higher strength is needed, Inconel 725 is the age hardened alternative. See all Inconel alloys.
At a glance
- Nickel-chromium-molybdenum-niobium alloy
- Excellent pitting and crevice corrosion resistance
- Standard choice for seawater and subsea service
- Strength without age hardening
- Oxidation resistant at high temperature
Chemical composition
Inconel 625 chemical composition
Weight %. Other elements: Nb + Ta 3.15 / 4.15, Co 1.00 max. (if determined).
| Element | Min % | Max % |
|---|---|---|
| Cr | 20.00 | 23.00 |
| C | – | 0.10 |
| Si | – | 0.50 |
| Mo | 8.00 | 10.00 |
| Mn | – | 0.50 |
| Fe | – | 5.00 |
| Ti | – | 0.40 |
| Al | – | 0.40 |
| Ni | 58.00 | – |
| P | – | 0.015 |
| S | – | 0.015 |
Mechanical properties
Inconel 625 mechanical properties
Condition: annealed.
| Property | Value |
|---|---|
| Tensile strength (MPa) | 827 to 1034 |
| Yield strength (0.2% offset) (MPa) | 414 to 615 |
| Elongation in 2 in (50 mm) or 4D (%) | 30 to 60 |
| Hardness | 145 to 220 HB |
These figures are for general information only and may change without notice. We believe them to be accurate, but HAGUE FASTENERS LIMITED gives no warranty and accepts no liability for their accuracy or completeness. Actual properties may vary, and nothing here guarantees the material for a particular use.
Applications
Where Inconel 625 is used
Its resistance to pitting and crevice corrosion is used in seawater applications, and its strength and oxidation resistance in aerospace. Its strength and general corrosion resistance also see it used in heat exchangers, valves, pumps, nuclear reactors and flue gas desulphurisation systems.
- Subsea and offshore bolting
- Marine and seawater systems
- Heat exchangers, valves and pumps
- Nuclear reactor components
- Flue gas desulphurisation systems
Designations
Alternative designations and specifications
Alloy 625, W.NR 2.4856, UNS N06625, BS 3076 NA 21
What we make
Inconel 625 fasteners and components
Made to your drawing or to the standard you specify.
Certification and testing
Certified, traceable and tested
Inconel 625 bar comes from approved UK, EU or US mills with heat traceability to release. We supply EN 10204 3.1 or 3.2 certificates, PMI where specified and independent UKAS-accredited testing. See quality and testing.
Questions
Frequently asked questions
Is Inconel 625 good for seawater?
Yes. Inconel 625 has excellent resistance to pitting and crevice corrosion in seawater, which is why it is widely used for subsea and marine fasteners.
Should I choose Inconel 625 or Inconel 718 for bolts?
Choose 625 where corrosion resistance comes first and 718 where very high strength is needed. Inconel 625 is used annealed, while Inconel 718 is age hardened to much higher strength.
What is the equivalent of Inconel 625?
Inconel 625 is also known as Alloy 625, UNS N06625, W.Nr. 2.4856 and BS 3076 NA 21.
Do you make Inconel 625 fasteners for subsea projects?
Yes. We make Inconel 625 fasteners for subsea and offshore duty with EN 10204 3.1 or 3.2 certificates and full traceability.
Inconel 625 enquiry?
Send us your drawing or specification
Tell us the grade, condition, sizes, quantity and paperwork you need.