Comparison of Inconel 625 and Inconel 718 alloy strips
Due to its high chromium and molybdenum content, Inconel 625 steel strip exhibits excellent corrosion resistance, making it suitable for highly corrosive chemical and marine environments. In contrast, Inconel 718 steel strip, through precipitation hardening and a higher niobium content, offers superior high-temperature strength and toughness, making it ideal for aerospace and gas turbine applications. The choice of steel strip depends on your priorities regarding corrosion resistance (625) and high-temperature strength (718).
What is the melting point of Inconel 718?
The melting point of Inconel 718 is a range, not a single temperature, between 1260 and 1336°C (2300 to 2437°F). The solidus (the point at which melting begins) is 1260°C (2300°F), and the liquidus (the point at which complete melting occurs) is 1336°C (2437°F).
Melting range: 1260-1336°C (2300-2437°F)
Solidus: 1260°C (2300°F)
Liquidus: 1336°C (2437°F)
Comparison of Inconel 625 and Inconel 718 Alloy Strips
Although Inconel 625 and Inconel 718 alloy strips are very similar in properties and elemental composition, some subtle differences exist, making them suitable for different applications.
In this section, we will detail the differences between Inconel 625 and Inconel 718 alloy strips to help you understand how to distinguish between these two alloys.
Composition
The main difference between Inconel 625 and Inconel 718 alloy strips lies in their chemical composition. Both are nickel-based alloys, but with different nickel contents.
Inconel 625 is primarily nickel-based, while Inconel 718 is primarily nickel and cobalt-based. Because Inconel 718 is nickel and cobalt-based, it has higher strength and hardness compared to Inconel 625. However, Inconel 625 contains higher levels of chromium and molybdenum, giving it greater corrosion resistance.
Properties
Inconel 718 and Inconel 625 alloys have similar properties. Like other nickel-based alloys, both Inconel 718 and Inconel 625 are strong, corrosion-resistant, and easy to weld.
The different chemical compositions of these two Inconel alloys result in different properties. While both are heat-resistant, Inconel 718 has a higher melting point, ranging from 1321°C to 1393°C. However, Inconel 625 alloy has a higher content of molybdenum and chromium, giving it superior corrosion resistance.
Purity
Compared to Inconel 718, Inconel 625 alloy has a lower iron content. This means that alloy 625 has a higher content of chromium, nickel, and molybdenum than alloy 718.
Nickel has strong corrosion resistance, while chromium is considered a key element for corrosion resistance. Therefore, Inconel 625 alloy has better corrosion resistance than Inconel 718 alloy.
Inconel 625 Alloy Strip Applications
Inconel 625 alloy has extremely high corrosion resistance, making it widely used in the oil and gas industry. It is also popular in the aerospace field.
Inconel 718 Alloy Strip Applications
Inconel 718 alloy has wide applications in the aerospace industry. It has excellent heat resistance, making it ideal for projects requiring high-temperature environments.
| Feature | Inconel 783 | Inconel 718 |
|---|---|---|
| Thermal Expansion | Lower (approximately 20% lower than 718) | Higher (13 μm/m·°C between 20-100°C) |
| Oxidation Resistance | Higher, especially at elevated temperatures | Good, but 783 is superior in this regard |
| Density | Lower (7.81 g/cm³) | Higher (8.19 g/cm³) |
| Primary Application | Gas turbine engines and other high-temperature applications | Broad use in aerospace, turbines, and other high-strength applications |
| Strength | Enhanced by precipitation hardening (niobium and aluminum) | High strength from precipitation hardening (niobium, titanium, aluminum) |
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
Gnee Steel is a supplier of Inconel 718 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel 718 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel 718, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
