Can Alternative Materials Replace Stellite in Check Valve Applications?

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In summary, the conversation discusses the use of stellite material for check valves and the difficulty suppliers are having in meeting this specification. The speaker suggests that stellite is not commonly used for check valve seats and that plastic or elastomer seats are more common. The speaker also mentions the use of A351 material as a potential substitute, but notes that it is not as wear resistant or hard as stellite. The conversation also mentions the reasons behind the use of stellite in the company's standards.
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Dirkl
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Hi,

In our chemical company, the pipe spec for check valves prescribes stellited material for disc and seat.
Now, suppliers are having a hard time meeting this specification.

Are there other materials with comparable properties that are more commonly used?

Mostly suppliers offer SS (eg A351 CF8M)

Fluids go from water, nitrogen to hydrocarbons.
Press/Temp starts at -28°C/9 bar over 50°C/18 bar to 350°C/4 bar

Thanks!
 
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  • #2
Check valves are not typically made with stellite for the seat. Most checks are soft seated. In other words, they use a plastic or elastomer seat to provide the sealing. Stellite might be used in abrasive media or where metal to metal sealing is required but is otherwise not very common as I'm sure you're aware.

Most large companies will have in house standards that components must meet and the reason for these kinds of specifications is that people in your company have had problems that were resolved using stellite so I suspect your company has some history behind the decision to go with stellite. Regarding A351, that material is not particularly wear resistant nor is it very hard like stellite. It wouldn't be a good substitute for stellite.
 

FAQ: Can Alternative Materials Replace Stellite in Check Valve Applications?

What is Stellite and how is it used?

Stellite is a cobalt-chromium alloy that is commonly used as a substitute material for parts that require high strength, corrosion resistance, and wear resistance. It is often used in applications such as cutting tools, valves, and turbine blades.

What are the benefits of using Stellite as a substitute material?

Using Stellite as a substitute material offers several benefits, including its high strength, resistance to corrosion and wear, and ability to maintain its properties at high temperatures. It is also relatively easy to machine and can be welded to other materials.

How does Stellite compare to other substitute materials?

Stellite is often compared to other substitute materials such as tungsten carbide and ceramics. While each material has its own unique properties, Stellite offers a good balance of strength, corrosion resistance, and wear resistance, making it a popular choice for a wide range of applications.

What are the limitations of using Stellite as a substitute material?

One limitation of Stellite is its high cost compared to other materials. It is also not suitable for use in highly corrosive environments, as it may corrode over time. Additionally, its high melting point makes it difficult to shape and form, limiting its use in certain applications.

What factors should be considered when selecting Stellite as a substitute material?

When considering Stellite as a substitute material, factors such as the specific application, operating conditions, and budget should be taken into account. It is also important to consider the properties of Stellite, such as its strength and corrosion resistance, to determine if it is the best choice for the intended use.

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