Hastelloy C22 vs SS 316L – What’s the Difference

Hastelloy C22 vs SS 316L

It is essential to use strong enough materials to withstand harsh conditions when it comes to industrial applications. Two of the most popular materials used in various processes are Hastelloy C22 and SS 316L. They both excel in their own right but differ in many ways. This blog post explores the differences between Hastelloy C22 and SS 316L, their properties, and which application suits each better.

What is Hastelloy C22?

Hastelloy C22 is an extremely corrosion-resistant nickel-chromium alloy. It contains 22% chromium, 12.5–14.5% molybdenum, and 2.5–3.5% tungsten, as well as iron, manganese, and cobalt for improved strength and toughness without loss of corrosion resistance. Its superior performance makes it ideal for a wide range of applications in highly corrosive environments, such as those in the chemical processing industry.

What is SS 316L?

SS 316L is an austenitic molybdenum-containing stainless steel. It offers superior corrosion resistance compared to other grades of stainless steel, particularly in environments with high chlorine levels. It is a popular choice for industrial applications and products coming into contact with seawater or other harsh materials.

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Difference Between Hastelloy C22 and SS 316L

Corrosion Resistance

One of the most significant differences between Hastelloy C22 and SS 316L is their corrosion resistance. Hastelloy C22 is highly corrosion-resistant to various sulfuric, hydrochloric, and phosphoric acids. On the other hand, SS 316L is also corrosion-resistant but on a smaller scale. Especially in chloride-rich environments, SS 316L is prone to pitting and stress corrosion cracking.

Strength and Durability

From a mechanical standpoint, Hastelloy C22 is significantly stronger and more durable than SS 316L. It has a higher yield strength and can withstand higher pressure and temperature. Hastelloy C22 is an alloy composed of nickel, chromium, molybdenum, and tungsten, among other elements. In contrast, SS 316L is composed mainly of iron, chromium, and nickel, among other elements.

Cost

Cost is often a significant factor when deciding which material to use for a specific application. SS 316L is more affordable than Hastelloy C22. The cost of Hastelloy C22 is higher because of its components, which take more work to the source. However, the cost of using Hastelloy C22 can be offset by its durability, corrosion resistance, and longer lifespan compared to SS 316L.

Application

Given their properties, each material is better suited for specific applications. Hastelloy C22 is generally used in environments with high temperatures, pressure, or acidity. Industries that commonly use Hastelloy include chemical processing, pulp, and paper industries, among others. SS 316L, on the other hand, is used in relatively less harsh environments like marine applications, food processing, and medical devices, among others.

Machinability

Machinability refers to how easy it is to cut and shape the material. SS 316L has excellent machinability and is easy to machine, especially at lower speeds, unlike Hastelloy C22, which has been reported to have poor machinability.

Conclusion

In conclusion, Hastelloy C22 and SS 316L are different materials with their properties and advantages when used in various industrial applications. When deciding which material to use, it is essential to consider factors such as corrosion resistance, strength, cost, and application requirements. By knowing the difference between these materials, industries can make informed decisions that ensure the processes run smoothly and efficiently while maintaining high safety standards.

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