Materials · Inconel
Inconel 718 fasteners
HAGUE FASTENERS makes Inconel 718 fasteners to order: stud bolts, bolts, nuts and machined parts in Inconel 718 (UNS N07718), made to your drawing from certified, traceable bar. The age hardened nickel alloy engineers specify when a fastener needs very high strength, heat resistance and corrosion resistance together.
1034 MPa
Minimum tensile strength, solution annealed and aged
827 to 965 MPa
Yield strength (0.2% offset)
40 HRC
Maximum hardness for NACE oil and gas service
UNS N07718
Also W.Nr. 2.4668, AMS 5662 and AMS 5663
About the alloy
High strength nickel alloy bolting
HAGUE FASTENERS makes Inconel 718 fasteners in the UK for oil and gas, power generation, aerospace and defence. Alloy 718 is a precipitation hardening nickel-chromium-iron alloy with niobium and molybdenum, and it is one of the strongest nickel alloys used for bolting.
The heat treatment is matched to the duty. For oil and gas, alloy 718 is heat treated so that hardness does not exceed 40 HRC, the maximum allowed by NACE MR0175 (MR-01-75) to prevent stress corrosion cracking. For aerospace and power generation it is treated for maximum strength and creep resistance, with typical hardness above 42 HRC.
At a glance
- Precipitation hardening nickel alloy
- Very high tensile and yield strength
- Creep resistant at high temperature
- Oil and gas condition held to 40 HRC maximum
- Made as stud bolt and nut sets
Chemical composition
Inconel 718 chemical composition
Weight %. Other elements: Nb + Ta 4.75 / 5.50, Co 1.00 max., B 0.006 max., Cu 0.30 max..
| Element | Min % | Max % |
|---|---|---|
| Cr | 17.00 | 21.00 |
| C | – | 0.08 |
| Si | – | 0.35 |
| Mo | 2.80 | 3.30 |
| Mn | – | 0.35 |
| Fe | Bal. | – |
| Ti | 0.65 | 1.15 |
| Al | 0.20 | 0.80 |
| Ni | 50.00 | 55.00 |
| P | – | 0.015 |
| S | – | 0.015 |
Mechanical properties
Inconel 718 mechanical properties
Condition: solution annealed and aged.
| Property | Value |
|---|---|
| Tensile strength (MPa) | 1034 min. |
| Yield strength (0.2% offset) (MPa) | 827 to 965 |
| Elongation in 2 in (50 mm) or 4D (%) | 20 min. |
| Reduction of area (%) | 25 min. |
| Hardness | 30 to 40 HRC |
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 718 is used
In oil and gas, alloy 718 is used for gate valves, choke stems, fasteners, tubing hangers and fire safe valves. In aerospace and power generation it is used for gas turbine and aircraft engine components, fasteners and other high strength parts.
- Oil and gas valves, wellhead and subsea bolting
- Gas turbine and power plant fasteners
- Aircraft engine components
- Defence equipment needing high strength
Designations
Alternative designations and specifications
Inconel 718, Alloy 718, UNS N07718, AMS 5662, AMS 5663, W.Nr. 2.4668
What we make
Inconel 718 fasteners and components
Made to your drawing or to the standard you specify.
Certification and testing
Certified, traceable and tested
Inconel 718 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. Heat treatment is by approved partners, with furnace charts on request. See quality and testing.
Questions
Frequently asked questions
Why are Inconel 718 fasteners so strong?
Because alloy 718 is precipitation hardened. After solution annealing, an ageing treatment forms fine strengthening particles in the nickel matrix, giving a minimum tensile strength of 1034 MPa in the condition shown above.
What hardness is Inconel 718 for NACE service?
For oil and gas service, Inconel 718 is heat treated so that hardness does not exceed 40 HRC, the limit set by NACE MR0175 to prevent stress corrosion cracking.
What is the equivalent of Inconel 718?
Inconel 718 is also known as Alloy 718, UNS N07718 and W.Nr. 2.4668, and is supplied to AMS 5662 and AMS 5663.
Do you make Inconel 718 stud bolts and nuts?
Yes. We make Inconel 718 stud bolts, bolts and nuts to drawing or standard, from one-offs to batches of several hundred.
Inconel 718 enquiry?
Send us your drawing or specification
Tell us the grade, condition, sizes, quantity and paperwork you need.