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Inconel is a family of nickel-chromium-based superalloys known for their exceptional strength, corrosion resistance, and ability to withstand extreme temperatures. These alloys maintain their mechanical properties in harsh environments, including oxidizing and reducing atmospheres, making them ideal for aerospace, power generation, chemical processing, and marine applications.
Common grades of Inconel, such as Inconel 600, 625, and 718, offer superior resistance to oxidation, carburization, and thermal fatigue. They conform to international standards like ASTM B163, B164, and B444, providing durable and high-performance solutions for critical components like heat exchangers, turbine blades, and pressure vessels.
| Element | Inconel 600 (%) | Inconel 625 (%) | Inconel 718 (%) |
|---|---|---|---|
| Nickel (Ni) | 72.0 min | 58.0 – 63.0 | 50.0 – 55.0 |
| Chromium (Cr) | 14.0 – 17.0 | 20.0 – 23.0 | 17.0 – 21.0 |
| Iron (Fe) | Balance | Balance | 17.0 – 21.0 |
| Molybdenum (Mo) | - | 8.0 – 10.0 | 2.8 – 3.3 |
| Niobium (Nb) | - | 3.15 – 4.15 | 4.75 – 5.50 |
| Cobalt (Co) | - | Max 1.0 | Max 1.0 |
| Aluminum (Al) | - | 0.4 – 0.8 | 0.2 – 0.8 |
| Titanium (Ti) | - | 0.4 – 0.7 | 0.65 – 1.15 |
| Carbon (C) | Max 0.15 | Max 0.10 | Max 0.08 |
| Manganese (Mn) | Max 1.0 | Max 0.50 | Max 0.35 |
| Silicon (Si) | Max 0.50 | Max 0.50 | Max 0.35 |
| Phosphorus (P) | Max 0.015 | Max 0.015 | Max 0.015 |
| Sulfur (S) | Max 0.015 | Max 0.015 | Max 0.015 |
| Property | Inconel 600 | Inconel 625 | Inconel 718 |
|---|---|---|---|
| Tensile Strength | 580 MPa (84 ksi) min | 827 MPa (120 ksi) min | 1,270 MPa (184 ksi) min |
| Yield Strength (0.2% offset) | 275 MPa (40 ksi) min | 414 MPa (60 ksi) min | 1,030 MPa (150 ksi) min |
| Elongation (%) | 30% min | 30% min | 12 – 20% |
| Hardness (HRB) | 80 max | 90 max | 35 – 40 HRC |
| Modulus of Elasticity | ~207 GPa | ~207 GPa | ~205 GPa |
| Density | 8.43 g/cm³ | 8.44 g/cm³ | 8.19 g/cm³ |
| Melting Point | 1354 – 1413°C | 1290 – 1350°C | 1260 – 1336°C |