Stellite 6 vs 6B – What’s the Difference?

Choosing the right material for your application ensures long-lasting performance and avoids costly replacements. Stellite 6 and 6B are two popular cobalt-based alloys with excellent wear resistance, high-temperature strength, and superior corrosion resistance. However, their composition, properties, and applications differ, making it essential to understand their differences before deciding which one is right for your needs. In this blog post, we’ll explore the differences between stellite 6 vs 6B and help you make an informed decision.

Difference between Stellite 6 and 6B


Stellite 6 is a cobalt-chromium alloy with tungsten and carbon, typically containing 27-32% cobalt, 4-5% chromium, 1-3% tungsten, and less than 1% carbon. On the other hand, Stellite 6B is a modified version of Stellite 6, with a higher chromium and silicon and lower carbon content. It typically contains 28-33% cobalt, 3-5.5% chromium, 1.5-3% molybdenum, 3-4.5% silicon, and less than 0.3% carbon. Adding molybdenum and silicon in Stellite 6B improves its ability to resist wear, corrosion, and cavitation.


While both Stellite 6 and 6B are excellent materials for wear resistance and high-temperature applications, they differ in their properties. Stellite 6 is known for its excellent erosion, galling, and corrosion resistance, making it ideal for valves, seats, and bearings. It also has good mechanical properties, such as high strength, hardness, and toughness. In contrast, Stellite 6B is preferred for applications that involve severe wear, abrasion, and impact, such as cutting tools, saw blades, and petroleum equipment. Thanks to the added molybdenum and silicon, it has a higher hardness and wear resistance than Stellite 6.


The choice between Stellite 6 and 6B depends on the specific application requirements. If the application involves high-temperature conditions, corrosive environments, and moderate wear, Stellite 6 is an excellent choice. On the other hand, if the application involves severe wear, abrasion, and impact, Stellite 6B is a better option. Both materials are commonly used in aerospace, defence, power generation, and oil and gas industries.


Stellite 6 and 6B are difficult to machine due to their high hardness and toughness. They require special cutting tools, low cutting speeds, and high feed rates to achieve good surface finish and dimensional accuracy. However, Stellite 6B is slightly more difficult to machine than Stellite 6 due to its higher hardness and wear resistance.


The cost of Stellite 6 and 6B varies depending on the supplier, order quantity, and application. Generally, Stellite 6B is more expensive than Stellite 6 due to its higher performance and added alloying elements.

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In conclusion, Stellite 6 and 6B are excellent materials for high-temperature, wear-resistant applications. They differ in composition, properties, and applications, making choosing the right one for your specific needs essential. Stellite 6 is suitable for moderate wear, corrosion, and erosion resistance, while Stellite 6B is preferred for severe wear, abrasion, and impact. Ultimately, the choice depends on the specific application requirements of your project. Contact your material supplier or manufacturer to discuss your application requirements and choose the best material.

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