For procurement teams in the aerospace, power generation, oil and gas, and nuclear industries, Inconel alloys offer exceptional performance in high-temperature and corrosive environments. Although both Inconel 718 and Inconel X-750 are nickel-based superalloys, fundamental differences in their composition lead to significantly different performance characteristics and procurement decisions.
Inconel 718 VS Inconel X-750:Composition
Inconel 718 VS Inconel X-750: UNS & Standards
| Alloy | UNS Number | Key Standards |
|---|---|---|
| Inconel 718 | UNS N07718 | ASTM B637, AMS 5662 / 5663 / 5664 |
| Inconel X-750 | UNS N07750 | ASTM B637, AMS 5667 / 5668 / 5698 |
What Is Inconel 718?
Inconel 718 is a high-strength, corrosion-resistant nickel-based superalloy, primarily available in various forms such as bars, forgings, and plates. It performs exceptionally well in temperatures ranging from cryogenic temperatures up to 1300°F (700°C), and also exhibits excellent weldability and good oxidation resistance. It is suitable for demanding applications in aerospace (jet engines, rockets), oil and gas (downhole tools, pumps), and nuclear energy.
What Is Inconel X-750?
Inconel X-750 is a high-strength, precipitation-hardened nickel-chromium alloy known for its excellent strength, corrosion resistance, and oxidation resistance at high temperatures (up to approximately 1300°F/700°C) and even at low temperatures. Therefore, it is ideally suited for demanding aerospace, gas turbine (rotor blades, piping), rocket engine, and nuclear power components such as springs, fasteners, and structural parts. Its strength is achieved through the addition of aluminum and titanium and further enhanced by heat treatment.
Inconel 718 vs Inconel X-750: What Are Their Differences?
Due to its molybdenum content, Inconel 718 possesses excellent strength, weldability, and corrosion resistance (especially in reducing environments), making it ideal for aerospace applications; while Inconel X-750 offers better high-temperature oxidation resistance and is more cost-effective for general high-temperature applications such as power generation, but it is more difficult to machine and weld.
Inconel 718 vs Inconel X-750：Composition( for Buyers)
| Alloy | Primary Precipitate | Composition Driver |
|---|---|---|
| Inconel 718 | γʺ (Ni₃Nb) | High Nb content |
| Inconel X-750 | γʹ (Ni₃(Al,Ti)) | High Al + Ti |
Chemical Composition: Inconel 718 vs Inconel X-750
| Element | Inconel 718 | Inconel X-750 |
|---|---|---|
| Ni | 50-55% | 70% minimum |
| Cr | 17-21% | 14-17% |
| Fe | Bal. | 5-9% |
| Mo | 2.8-3.3% | – |
| Ti | 0.65-1.15% | 2.25-2.75% |
| Al | 0.2-0.8% | 0.4-1% |
| Nb | 4.75-5.5% | – |
| Co | 1% max | 1% max |
Mechanical Properties: Inconel 718 vs Inconel X-750
| Property | Inconel 718 | Inconel X-750 |
|---|---|---|
| Tensile Strength | 1370 MPa | 1100 MPa |
| Yield Strength | 1030 MPa | 780 MPa |
| Elongation | 12-15% | 15-20% |
| Hardness (Rockwell) | B95-C36 | B88-C32 |
Physical Properties: Inconel 718 and Inconel X-750
| Property | Inconel 718 | Inconel X-750 |
|---|---|---|
| Density (g/cm³) | 8.19 | 8.28 |
| Melting Range (°C) | 1260 – 1336 | 1390 – 1430 |
| Thermal Conductivity (W/m·K, at 20°C) | ~11.4 | ~11.4 |
| Electrical Resistivity (µΩ·m, at 20°C) | ~1.29 | ~1.29 |
| Elastic Modulus (GPa) | 200–210 | 207 |
Inconel 718 vs Inconel X-750: Which is Better?
| Criteria | Inconel 718 | Inconel X-750 |
|---|---|---|
| Cost | Higher cost | More affordable |
| Machinability | Easier to machine | More challenging to machine |
| Weldability | Excellent | Less weldable |
| Corrosion Resistance | Superior | Moderate |
| Temperature Resistance | Up to 700°C | Up to 980°C |
Although Inconel 718 and Inconel X-750 appear similar, their chemical compositions define entirely different performance and procurement strategies.
Choose Inconel 718 for welded, high-strength structural components
Choose Inconel X-750 for high-temperature elastic and spring applications
At GNEE, Inconel 718 is available in various forms to meet diverse industrial needs:
Plates and Sheets (cold rolled and hot rolled)
Bars and Rods (round, square, hexagonal)
Tubes (seamless and welded)
Wires and Strips (for springs, fasteners, electrical applications)
Forgings and Custom Parts (according to drawings or specifications)
Specifications: UNS NO7718, WNR 2.4668, AFNOR NC19FeNb, JIS NCF 718, GOST ХН75МБТЮ, EURONORM NiCr22Mo9Nb, OR ЭИ602, BS NA 21.
Temperature Range: -423°F to 1300°F.
Testing and Documentation: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Testing Reports, Non-Destructive Testing Reports, PMI Test Reports, Visual Inspection Reports, Third-Party Inspection Reports, NABL Certified Laboratory Reports.
Packaging: Wooden crates, bubble wrap, steel strapping, or packaged according to customer requirements.
