Inconel is a family of nickel-chromium-based superalloys known for their exceptional resistance to extreme environments, including high temperatures, corrosion, and oxidation. These alloys are widely used in aerospace, chemical processing, power generation, and other demanding industries. We supply Inconel alloys in the form of Wires, Bars and Strips/Tapes.
Key Properties of Inconel:
Here’s a detailed comparison of key Inconel alloys, highlighting their compositions, properties, and typical applications to help you select the right grade for specific needs:
| Property | Inconel 600 | Inconel 601 |
| Composition | Ni (~72%), Cr (~15%), Fe (~8%) | Ni (~58%), Cr (~23%), Fe (~14%), Al (~1.4%) |
| Max Temp. | 1,100°C (2,012°F) | 1,250°C (2,282°F) |
| Key Strength | Good oxidation resistance | Superior oxidation resistance (Al addition) |
| Applications | Furnace parts, chemical reactors | High-temp heat treatment equipment, gas turbines |
Winner for High Temp: Inconel 601 (better oxidation resistance due to aluminum).
| Property | Inconel 625 | Inconel 718 |
| Composition | Ni (~58%), Cr (~20%), Mo (~8%) + Nb | Ni (~52%), Cr (~19%), Fe (~18%), Nb (~5%) + Ti |
| Strength | Excellent corrosion resistance | Higher tensile strength (age-hardenable) |
| Max Temp. | 980°C (1,800°F) | 700°C (1,300°F) (long-term) |
| Fabrication | Easier to weld | Prone to cracking during welding |
| Applications | Marine, chemical processing | Aerospace, jet engines, fasteners |
Winner for:
– Corrosion Resistance: Inconel 625 (more molybdenum).
– Mechanical Strength: Inconel 718 (precipitation hardening).
| Property | Incoloy 800 | Incoloy 825 |
| Composition | Ni (~32%), Fe (~46%), Cr (~21%) | Ni (~42%), Fe (~30%), Cr (~21%), Mo (~3%) + Cu (~2%) |
| Corrosion | Good oxidation resistance | Superior acid/sulfide resistance (Mo + Cu) |
| Applications | Heat exchangers, power plants | Sulfuric acid piping, oil & gas |
Winner for:
– Chemical Resistance: Inconel 825 (better for acidic environments).
– Cost-Effectiveness: Inconel 800 (lower nickel content).
Summary Table: Key Inconel Alloys
| Alloy | Best For | Weakness |
| 600 | Moderate temps, oxidation resistance | Lower strength at high temps |
| 601 | Extreme oxidation (furnaces) | Less fabricable than 600 |
| 625 | Marine/chemical corrosion | Not age-hardenable |
| 718 | Aerospace strength & weldability | Lower max temp than X-750 |
| 800/825 | Cost-effective corrosion resistance | Lower strength than 625/718 |
How to Choose?
Challenges with Inconel:
– Difficult to Machine – Work hardening can cause tool wear; requires slow speeds and high coolant use.
– Expensive – High nickel and chromium content increases material costs.
– Specialized Welding Needed – Prone to cracking; often requires TIG or electron beam welding.
Alternatives (Depending on Application):
– Hastelloy (better for chemical resistance)
– Stainless Steel (cheaper but less heat-resistant)
– Titanium Alloys (lighter but lower temperature limits)
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