Inconel 625 VS 800 Alloy
What is the difference between Inconel 625 Grade 1 and Grade 2?
Grade 1 is typically annealed around 1600°F to 1800°F (about 871°C to 982°C) to provide good ductility and corrosion resistance while maintaining higher strength than Grade 2. Grade 2 is heat treated above 2000°F (about 1093°C) to enhance creep and stress rupture resistance while maintaining corrosion resistance.
What is the difference between Inconel 625 and 800 Alloy
Inconel 625 has high corrosion fatigue strength, tensile strength, and resistance to chloride ion stress corrosion cracking. The advantage of Inconel 800 alloy is that it is more resistant to various types of corrosion.
What grade is Inconel 625 Pipe?
Inconel 625 Pipe is a nickel-chromium super alloy pipe that consists of 58% nickel, 20% chromium, carbon, manganese, silicon, iron, sulfur, aluminum, and titanium. The pipe is extremely corrosion resistant. Gnee Steel is a leading manufacturer and supplier of Inconel 625 Pipe.
What is the composition of Inconel 625 pipe?
Minimum 58% nickel, 20-23% chromium, maximum 5% iron, 8-10% molybdenum
What is the difference between Inconel 625 and 800 Alloy?
| Element | Alloy 600 | Alloy 800 |
|---|---|---|
| S (Sulfur) | ≤ 0.015% | ≤ 0.015% |
| Si (Silicon) | ≤ 0.50% | ≤ 1.00% |
| C (Carbon) | ≤ 0.15% | ≤ 0.10% |
| Mn (Manganese) | ≤ 1.00% | ≤ 1.50% |
| Ti (Titanium) | (Not specified) | 0.15% ~ 0.60% |
| Cu (Copper) | ≤ 0.50% | ≤ 0.75% |
| Fe (Iron) | 6.0% ~ 10.0% | ≥ 39.5% |
| Cr (Chromium) | 14.0% ~ 17.0% | 19.0% ~ 23.0% |
| Ni (Nickel) | ≥ 72.0% | 30.0% ~ 35.0% |
Purity
The purity of Inconel 600 is better than that of Incoloy 800, which is mainly reflected in the content of silicon and manganese. For high-temperature alloys, silicon and manganese are harmful elements in most cases, which will affect the instantaneous and long-term performance of the alloy.
Therefore, Inconel 600 has stricter control over harmful elements than Incoloy 800, and has a more solid foundation in terms of material performance.
Corrosion Resistance
To save costs, more iron is added to Incoloy 800. In comparison, the nickel content of Incoloy 800 is lower than that of Inconel 600. The lower nickel content inevitably leads to a decrease in the corrosion resistance of the material.
To reduce this effect, more chromium is added to Incoloy 800 to improve the material's oxidation resistance. Incoloy 800 also adds a certain amount of aluminum to further enhance its high temperature corrosion resistance.
Overall, Inconel 600 has better oxidation resistance than Incoloy 800.
| Inconel 600 | Incoloy 800 | |
|---|---|---|
| Density, g/cm³ | 8.47 | 7.94 |
| Density, lb/in.³ | 0.306 | 0.287 |
| Melting Range, °F | 2470-2575 | 2475-2525 |
| Melting Range, °C | 1354-1413 | 1357-1385 |
| Curie Temperature, °F | -192 | -175 |
| Curie Temperature, °C | -124 | -115 |
Conclusion
Inconel 600 is a high-performance high-temperature alloy with excellent high-temperature corrosion resistance. Incoloy 800 was introduced after Inconel 600 and is a low-cost alternative to Inconel 600.
Inconel 600 is superior to Incoloy 800 in many aspects. You need to choose these two alloys based on the actual situation of the project.
Gnee Steel produces high-quality Inconel 600 and Incoloy 800. If you have any needs in this regard, please contact us.
