The Difference Between Inconel 625 and Inconel 718 Alloys
Inconel 625 alloy offers excellent corrosion resistance and high formability, making it ideal for chemical, marine, and offshore applications. Inconel 718, due to its precipitation-hardening properties, excels in high-strength, high-temperature applications such as aerospace and gas turbine components. The key difference between the two is that Inconel 625 focuses on corrosion protection through its high nickel, chromium, and molybdenum contents, while Inconel 718 focuses on improving mechanical properties through age hardening.
What is the difference between Inconel 600 and 718 Alloy?
Inconel 600 offers excellent corrosion resistance and formability, making it suitable for chemical processing and marine applications. On the other hand, Inconel 718 offers excellent high-temperature strength and creep resistance, making it a preferred choice for aerospace and oil and gas applications.
Specifications of inconel 625 vs inconel 718
| Specification | Inconel 718 | Inconel 625 |
| Tensile Strength | 135 ksi (930 MPa) | 135 ksi (930 MPa) |
| Melting Point | 2300°F (1260°C) | 2350°F (1290°C) |
| Density | 8.19 g/cm³ | 8.44 g/cm³ |
| Yield Strength | 95 ksi (655 MPa) | 75 ksi (517 MPa) |
Inconel 625 vs 718: Chemical Composition
| Element | Inconel 625 Composition (%) | Inconel 718 Composition (%) |
| Nickel (Ni) | 58.0 min | 50.0 min |
| Chromium (Cr) | 20.0-23.0 | 17.0-21.0 |
| Molybdenum (Mo) | 8.0-10.0 | 2.8-3.3 |
| Niobium (Nb) + Tantalum (Ta) | – | 4.75-5.50 |
| Iron (Fe) | 5.0 max | 0.0-21.0 |
| Titanium (Ti) | 0.40 max | 0.65-1.15 |
| Aluminum (Al) | 0.40 max | 0.20-0.80 |
| Cobalt (Co) | 1.0 max | 1.0 max |
| Carbon (C) | 0.10 max | 0.08 max |
| Manganese (Mn) | 0.50 max | 0.35 max |
| Silicon (Si) | 0.50 max | 0.35 max |
| Sulfur (S) | 0.015 max | 0.015 max |
| Phosphorus (P) | 0.015 max | 0.015 max |
Inconel 718 Properties
| Property | Value |
| Density | 8.19 g/cm³ |
| Melting Point | 1260-1340°C (2300-2440°F) |
| Tensile Strength | 1034 MPa (150 ksi) |
| Yield Strength | 724 MPa (105 ksi) |
| Elongation | 12% |
| Modulus of Elasticity | 200 GPa (29.0 x 10^6 psi) |
| Thermal Conductivity | 11.0 W/m·K (at 100°C) |
| Specific Heat Capacity | 447 J/kg·K |
| Coefficient of Thermal Expansion | 13.3 µm/m·K (20-100°C) |
| Electrical Resistivity | 1.22 µΩ·m (at 21°C) |
Inconel 625 Properties
| Property | Value |
| Melting Point | 1290-1350°C (2350-2460°F) |
| Tensile Strength | 827 MPa (120,000 psi) |
| Density | 8.44 g/cm³ |
| Yield Strength (0.2% offset) | 414 MPa (60,000 psi) |
| Elongation | 30% in 2 inches |
| Hardness (HRC) | 20-30 |
| Thermal Conductivity | 11.5 W/m·K (70°F) |
| Coefficient of Thermal Expansion | 13.3 µm/m-°C (20-100°C) |
| Specific Heat Capacity | 442 J/kg·K (20°C) |
| Electrical Resistivity | 1.29 µΩ·m (20°C) |
| Corrosion Resistance | Excellent resistance to corrosion in many environments, including seawater, acids, and oxidizing chemicals. |
Inconel 625 vs Inconel 718: Industrial Applications
| Aspect | Inconel 625 | Inconel 718 |
| Chemical Makeup | Primarily nickel and chromium, with additional | Contains nickel, chromium, niobium, and molybdenum, |
| elements like molybdenum and niobium. | among others. | |
| Strength | Offers good strength and toughness, suitable for | Provides superior strength and high-temperature |
| high-temperature applications. | applications, such as aircraft engines. | |
| Corrosion | Excellent corrosion resistance, particularly in | Good corrosion resistance and weldability, making |
| Resistance | acidic environments. | it ideal for harsh environments. |
| Temperature | Can withstand high temperatures, making it | Exhibits excellent resistance to oxidation and |
| Resistance | suitable for heat exchangers and chemical | maintains strength at elevated temperatures. |
| processing equipment. |
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications, and we can provide customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
