Incoloy 800 vs Inconel 625 – What’s the Difference

Incoloy 800 vs Inconel 625

Regarding high-performance alloys, Incoloy 800 and Inconel 625 are two popular choices. Both metals have impressive properties, including high-temperature strength, corrosion resistance, and thermal stability. However, significant differences between the two materials can make one more suitable than the other, depending on the specific application. In this blog post, we’ll take a closer look at Incoloy 800 vs Inconel 625, their properties, and their main differences.

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Difference Between Incoloy 800 and Inconel 625

Composition

Incoloy 800 is a nickel-chromium alloy that contains iron, aluminium, and titanium. The alloy’s high nickel content makes it highly resistant to oxidation and corrosion while adding aluminium and titanium enhances its strength and stability at high temperatures. Inconel 625 is a nickel-chromium-molybdenum alloy containing small amounts of niobium and tantalum. This alloy has superior strength and corrosion resistance compared to Incoloy 800 due to its molybdenum content and the addition of niobium and tantalum.

Temperature Range

Incoloy 800 is best suited for applications that require high-temperature strength and resistance to oxidation and carburization in the temperature range of 1000 to 1100°C. Inconel 625, on the other hand, can handle much higher temperatures of up to 1200°C while still maintaining its strength and corrosion resistance. This makes Inconel 625 a better choice for applications that require even greater thermal stability and corrosion resistance than Incoloy 800.

Corrosion Resistance

Incoloy 800 has good corrosion resistance in reducing and oxidizing environments, including sulfuric, hydrochloric, and phosphoric acids. However, it is susceptible to chloride-induced stress corrosion cracking (SCC). Inconel 625 has superior resistance to SCC and corrosion in various aggressive chemical environments. It is commonly used in seawater applications, where it needs to resist pitting and crevice corrosion.

Cost

Incoloy 800 is generally less expensive than Inconel 625 due to its lower molybdenum content and the absence of niobium and tantalum. However, this cost differential should be weighed against the application’s specific needs. If the application requires higher temperature or corrosion resistance, investing in the more expensive Inconel 625 may be worth investing in.

Applications

Incoloy 800 is commonly used in chemical and petrochemical processing equipment, gas turbines, industrial furnaces, and heat-treating equipment. Inconel 625 is often used in high-temperature applications in aerospace, marine engineering, power generation, and chemical processing industries. Its superior corrosion resistance makes it popular for seawater applications, chemical processing equipment, and oil and gas extraction.

Conclusion

In summary, Incoloy 800 and Inconel 625 are two highly effective alloys with distinct properties that make them suitable for different applications. In general, Incoloy 800 is a good choice for applications requiring high-temperature strength and oxidation resistance. In contrast, Inconel 625 is better suited for applications that require even higher thermal stability and superior corrosion resistance. Ultimately, the best choice between the two depends on the application’s specific requirements, and a thorough evaluation of cost and performance may be necessary to make the right decision.

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