Inconel 718 and Inconel X-750: A Comprehensive Comparison
Inconel 718 and Inconel X-750: A Comprehensive Comparison
Inconel 718 possesses exceptional strength (especially at high temperatures) and superior overall corrosion resistance, thanks to its higher chromium content and added molybdenum, making it an ideal material for the aerospace industry; Inconel X-750 exhibits excellent thermal fatigue and stress corrosion resistance and is commonly used in power generation and chemical processing industries. It has higher elongation than 718 but lower strength. Both are precipitation-hardened nickel-based superalloys, but the composition of alloy 718 (higher chromium, molybdenum, and niobium content) gives it higher tensile and yield strength, while X-750 offers superior fatigue and creep performance in specific harsh environments.
Is Inconel X-750 magnetic?
This material possesses excellent creep resistance and is non-magnetic. It retains enhanced strength properties at high temperatures up to 1300°F (700°C) and exhibits good oxidation resistance at temperatures up to 1800°F (983°C). Inconel X-750 is resistant to a variety of industrial corrosive media under both oxidizing and reducing conditions.
What Is Inconel 718?
Inconel 718 is a nickel-based superalloy known for its high strength, corrosion resistance, and excellent weldability. It can be strengthened through precipitation hardening, meaning its mechanical properties can be improved through heat treatment.
Temperature Range: Performs well in a temperature range of -250°C to 700°C.
Corrosion Resistance: Exhibits excellent resistance to oxidation, pitting corrosion, and stress corrosion cracking, even in harsh environments.
Mechanical Strength: Possesses high tensile strength and yield strength due to the presence of niobium.
Applications: Commonly used in aerospace turbines, gas turbines, nuclear reactors, and the oil and gas extraction industry.
What Is Inconel X-750?
Inconel X-750 is another nickel-based alloy that performs exceptionally well in high-temperature environments. It is also a precipitation-hardening alloy, but contains more aluminum and titanium than Inconel 718, resulting in higher strength at elevated temperatures.
Temperature range: Performs best at temperatures up to 980°C.
Creep resistance: Exhibits excellent resistance to deformation under prolonged high-temperature stress.
Corrosion resistance: Has good resistance to oxidation and chemical corrosion, but slightly less than Inconel 718.
Applications: Commonly used in jet engines, nuclear reactors, springs, and fasteners.
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 |
Analysis:
Inconel 718 has a slightly lower density and a wider melting range, which contributes to its improved weldability and machinability.
Inconel X-750 has a higher melting point, which enhances its thermal stability in certain high-temperature applications.
High-Temperature Strength
| Feature | Inconel 718 | Inconel X-750 |
|---|---|---|
| Service Temperature | Up to 1,300°F (700°C) | Up to 1,400°F (760°C) |
| Oxidation Resistance | Good | Excellent |
| Creep Resistance | Very good | Excellent with additional stability |
Corrosion Resistance
| Corrosion Type | Inconel 718 | Inconel X-750 |
|---|---|---|
| General Corrosion | Excellent | Excellent |
| Pitting Corrosion | Very good | Excellent |
| Stress Corrosion Cracking | Moderate | Good |
| Acid Resistance | Good (in moderate concentrations) | Very good in acidic environments |
Typical Applications
| Application Area | Inconel 718 | Inconel X-750 |
|---|---|---|
| Aerospace Industry | Turbine engines, structural components | Gas turbines, combustion chambers |
| Power Generation | Gas turbine components | Heat exchangers, combustors |
| Chemical Processing | High-temperature reactors | Process equipment in petrochemical |
| Oil and Gas | Downhole tubing and valves | Gas and oil extraction equipment |
| Nuclear Engineering | Reactor cores, control rods | Reactor components |
Summary of Differences
| Feature | Inconel 718 | Inconel X-750 |
|---|---|---|
| Nickel Content | 50-55% | 70% min |
| Chromium Content | 17-21% | 14-17% |
| Strength | Higher yield and tensile strength | Lower but good strength |
| High-Temperature Use | Up to 1,300°F (700°C) | Up to 1,400°F (760°C) |
| Weldability | Good, requires preheating | Good, generally no preheating |
| Applications | Aerospace, power generation | Turbines, nuclear applications |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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