Inconel uns N07718 VS Inconel X-750
What is the corresponding American standard number for UNS N07718?
Alloy 718 (corresponding to Inconel 718) - UNS N07718.
What is the difference between Inconel uns N07718 and Inconel X-750?
X750 is a nickel-chromium alloy that is precipitation hardened by the addition of aluminum and titanium and has creep rupture strength at elevated temperatures of approximately 700°C (1290°F). INCONEL alloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel-chromium material with a service temperature range of -423°F to 1300°F.
What is UNS N07718 material?
Alloy 718 (UNS N07718, W No. 2.4668) is an austenitic nickel-base high temperature alloy. Alloy 718 exhibits excellent high yield tensile properties and creep rupture properties up to 700°C and is resistant to oxidation up to 800°C.
What is the difference between Inconel 718 and Inconel 725?
Inconel 718 has a Pitting Resistance Equivalent Number (PREN) of over 31, while Inconel 725 has a PREN of over 45, enabling it to operate in the harshest environments. Gnee Steel offers 725 alloy round bars in diameters from 1 inch to 4 inches (25.4 mm to 101.6 mm), and 718 alloy round bars in diameters from ½ inch to 10 inches (12.7 mm to 254 mm).
Inconel uns N07718 and Inconel X-750 specifications
Chemical Composition: Inconel 718 vs Inconel X-750
Both alloys are based on nickel-chromium but differ in the secondary elements that determine their performance characteristics:
| 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 |
Performance in High-Temperature Environments
Inconel 718:
Inconel 718 alloy is suitable for moderate to high temperature applications, but begins to lose mechanical properties above 700°C. Its weldability makes it suitable for manufacturing processes that require high precision.
Inconel X-750:
Inconel X-750 can withstand temperatures up to 980°C and has excellent creep resistance. This makes it more suitable for manufacturing components such as turbine blades and nuclear reactor springs that need to be exposed to extreme temperatures for a long time.
Corrosion Resistance: Inconel 718 VS Inconel X-750
Both alloys exhibit excellent corrosion resistance:
Inconel 718 More effective in resisting pitting, crevice corrosion and stress corrosion cracking, especially in aqueous and sour environments. It is the first choice for offshore oil and gas applications.
Inconel X-750 It has excellent oxidation resistance at high temperatures, but is less effective at resisting chemical attack than Inconel 718.
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 |
| Applications | High-strength, corrosive settings | High-temperature environments |
Choose Inconel 718:
If your application requires high strength, improved corrosion resistance and moderate temperature performance, such as oil and gas or aerospace manufacturing.
Choose Inconel X-750:
If your application involves extremely high temperatures and long-term pressures, such as turbines, nuclear reactors or high-temperature springs.
