Inconel 718丨UNS N07718
Inconel 718 is a precipitation-hardened nickel-chromium alloy known for exceptional strength, fatigue resistance and corrosion resistance at temperatures up to 700°C (1290°F).
J&A Alloy supplies Inconel 718 bar, plate, sheet, forging, ring, pipe and tube in accordance with ASTM, ASME and AMS specifications.
✓ Outstanding high-temperature strength
✓ Excellent fatigue and creep resistance
✓ Superior oxidation and corrosion resistance
✓ Widely used in aerospace and gas turbines
Inconel 718 Supplier & Manufacturer
Inconel 718 (UNS N07718, W.Nr. 2.4668) is a precipitation-hardening nickel-chromium alloy strengthened primarily by niobium and molybdenum additions. It offers an exceptional combination of high tensile strength, fatigue resistance, creep resistance and corrosion resistance across a wide temperature range.
Unlike many high-strength superalloys, Inconel 718 can be readily fabricated and welded before age-hardening treatment, making it one of the most versatile materials for aerospace, gas turbine, oilfield and power generation applications.
J&A Alloy supplies Inconel 718 in bar, rod, plate, sheet, forging, ring, wire, pipe and tube with complete material traceability and third-party inspection support.
Key Features of Inconel 718
- Exceptional tensile strength up to 700°C
- Excellent fatigue resistance
- Outstanding creep rupture strength
- Excellent oxidation resistance
- Good corrosion resistance
- Superior weldability among precipitation-hardened alloys
- High fracture toughness
- Excellent performance under cyclic loading
- Suitable for cryogenic and elevated temperatures
Chemical Composition of Inconel 718
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminum (Al) | 0.20 – 0.80 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 0.35 |
| Silicon (Si) | ≤ 0.35 |
| Sulfur (S) | ≤ 0.015 |
Mechanical Properties of Inconel 718
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1275 MPa |
| Yield Strength (0.2%) | ≥ 1035 MPa |
| Elongation | ≥ 12% |
| Hardness | 331–444 HB |
| Density | 8.19 g/cm³ |
| Melting Range | 1260–1336°C |
Corrosion Resistance
Inconel 718 offers excellent resistance to:
- Oxidation
- Sulfidation
- Chloride environments
- Seawater exposure
- Stress corrosion cracking
- Acidic atmospheres
The alloy performs significantly better than many stainless steels in aggressive high-temperature environments.
High Temperature Performance
One of the primary reasons for selecting Inconel 718 is its ability to retain mechanical strength at elevated temperatures.
Performance Advantages
- Service temperatures up to 700°C (1290°F)
- Excellent creep rupture strength
- Superior fatigue resistance
- Thermal stability during long-term exposure
- Oxidation resistance in turbine environments
These properties make Inconel 718 one of the most widely used aerospace superalloys worldwide.
Available Forms
J&A Alloy supplies Inconel 718 in:
- Round Bar
- Forged Bar
- Rod
- Plate
- Sheet
- Coil
- Wire
- Forgings
- Rings
- Pipe
- Tube
- Flanges
- Fittings
Custom dimensions available.
Applications of Inconel 718
Aerospace
- Turbine disks
- Compressor blades
- Engine shafts
- Jet engine components
Oil & Gas
- Downhole tools
- Wellhead equipment
- High-pressure valves
Power Generation
- Gas turbines
- Steam turbines
- Heat-resistant fasteners
Nuclear Industry
- Reactor components
- High-strength fasteners
Industrial Equipment
- Cryogenic storage systems
- High-temperature process equipment
Inconel 718 vs Inconel 625
| Property | Inconel 718 | Inconel 625 |
|---|---|---|
| Strength | Excellent | Good |
| Tensile Strength | ≥ 1275 MPa | ≥ 827 MPa |
| Yield Strength | ≥ 1035 MPa | ≥ 414 MPa |
| Fatigue Resistance | Excellent | Good |
| Creep Resistance | Excellent | Good |
| Corrosion Resistance | Very Good | Excellent |
| Weldability | Good | Excellent |
| Main Applications | Aerospace, Turbines | Chemical Processing, Marine |
| Cost | Higher | Lower |
Welding & Fabrication
Inconel 718 can be welded using:
- GTAW (TIG)
- GMAW (MIG)
- SMAW
- Electron Beam Welding
Advantages:
- Good weldability before aging
- Low susceptibility to strain-age cracking
- Excellent post-weld mechanical properties
Recommended filler metals include:
- ERNiFeCr-2
- Inconel Filler Metal 718
Standards & Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N07718 |
| W.Nr. | 2.4668 |
| ASTM | B637 |
| ASTM | B670 |
| ASTM | B906 |
| ASME | SB637 |
| AMS | 5662 |
| AMS | 5663 |
| AMS | 5596 |
| AMS | 5597 |
| ISO | 15156 (Oil & Gas Applications) |
Equivalent Names
- Inconel 718
- Alloy 718
- UNS N07718
- W.Nr. 2.466
Frequently Asked Questions
What is Inconel 718 used for?
Inconel 718 is widely used in aerospace engines, gas turbines, oilfield tools, and power generation equipment.
Why is Inconel 718 so strong?
Its strength comes from precipitation hardening through niobium and titanium additions.
What temperature can Inconel 718 withstand?
Inconel 718 maintains excellent mechanical properties up to approximately 700°C (1290°F).
Can Inconel 718 be welded?
Yes. It offers better weldability than many precipitation-hardened superalloys.
What is the difference between Inconel 718 and Inconel 625?
Inconel 718 provides significantly higher strength, while Inconel 625 offers superior corrosion resistance and weldability.
Why Choose J&A Alloy
✓ ASTM / ASME / AMS compliant materials
✓ Aerospace-grade quality control
✓ Full PMI and traceability
✓ Third-party inspection available
✓ Custom forgings and rings
✓ Competitive factory-direct pricing
✓ Global logistics support
Whether you require Inconel 718 bar, forging, plate, sheet, ring, or tube, J&A Alloy provides reliable high-performance alloy solutions for demanding aerospace and industrial applications.
