Hastelloy C276 vs Inconel 625 – What’s the Difference

Hastelloy C276 vs Inconel 625

When it comes to high-performance alloys, Hastelloy C276 and Inconel 625 are two of the most commonly used materials in various industries because of their exceptional mechanical properties. Both are nicked-based alloys with high heat and corrosion resistance but have several crucial differences that set them apart. Understanding these differences is essential, especially when selecting the best material type for your application. In this blog post, we will examine the differences between Hastelloy C276 and Inconel 625 to help you make an informed choice.

What is Inconel 625?

Inconel 625 is a Nickel-chromium-molybdenum alloy with superior corrosion and oxidation resistance. It’s widely used in extreme environments, as it’s resistant to high temperatures, chloride stress cracking, and erosion.

What is Hastelloy C276?

Hastelloy C276 is a nickel-molybdenum-chromium alloy designed for maximum corrosion resistance in severe environments. It has exceptional resistance to strong acids and chloride stress corrosion cracking, making it ideal for chemical processing applications.

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Difference Between Hastelloy C276 and Inconel 625

Composition

Hastelloy C276 is a nickel-molybdenum-chromium alloy with tungsten and cobalt as the minor elements. The alloy offers superior resistance to various types of corrosion, including pitting, crevice, and stress corrosion cracking. On the other hand, Inconel 625 is a nickel-chromium-molybdenum alloy with niobium, iron, and tantalum as minor additives. The alloy is highly resistant to corrosion and oxidation and performs well at high temperatures.

Mechanical Properties

Hastelloy C276 boasts exceptional mechanical properties and is highly resistant to thermal shock. It has a high tensile strength of 760 MPa and a yield strength of 350 MPa, with an elongation of around 55%. In contrast, Inconel 625 has a lower yield strength than C276 at around 350 MPa but has a higher tensile strength of 760 MPa, which makes it a reliable material for high-stress environments.

Application

Hastelloy C276 is ideal for aggressive chemical environments like those in the chemical processing, power generation, and oil and gas industries. It is also an excellent choice for applications in pickling, acid regeneration, and waste treatment plants. On the other hand, Inconel 625 is often used for its superior resistance to stress-corrosion cracking, making it a preferred material for seawater and aerospace applications.

Weldability

Hastelloy C276 is easier to weld than Inconel 625 because of its low carbon content, which minimizes the chances of carbide precipitation and embrittlement. Inconel 625, on the other hand, has a high carbon and alloy content, which enables it to maintain its mechanical strength at high temperatures but increases its susceptibility to weld cracking.

Cost

Hastelloy C276 is a more affordable option compared to Inconel 625. This can make it a reasonable choice when performance requirements are manageable. Inconel 625, however, commands a higher cost because of its unique mechanical properties, which makes it the preferred material choice for highly demanding applications.

Conclusion

Choosing the right alloy to suit your application needs requires considering several factors and understanding the fundamental differences between various materials. Hastelloy C276 and Inconel 625 are two popular high-performance alloys, each offering unique properties that differentiate them. Considering all these factors, it is possible to select the appropriate material type that will deliver the desired performance and ultimately ensure the success of your project.

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