Overview

Coballoy alloy is a superalloy with cobalt and chromium as the main elements. It has very good high temperature performance and corrosion resistance. However, its most widely known advantage is its wear resistance. Coballoy alloys are often strengthened by carbides. Compared to nickel alloys, Coballoy alloys can work well at higher temperatures.

Like other alloys, Coballoy alloys come in many different grades. In this article, we will introduce various Coballoy alloy grades in the simplest language. I believe that by reading, you can have a more comprehensive understanding of this kind of alloy.

Coballoy Grades / Types

Coballoy 1

The carbon content of Coballoy 1 is very high, which results in its excellent wear resistance. Coballoy 1's wear resistance and high hardness make it very difficult to machine. Therefore, this alloy often needs to be processed by grinding. Coballoy 1 is suitable for applications such as wear pads, rotating seal rings, pump sleeves, secondary impeller screws and bearing sleeves.

Coballoy 3

Coballoy 3 is the cast version of Coballoy 1. Therefore, its chemical composition is very similar to Coballoy 1. It also has excellent wear resistance and very high hardness. It maintains extremely high hardness at a temperature of 760°C. Coballoy 3 has tighter controls on silicon and manganese content to improve casting performance.

Coballoy 4

Compared to Coballoy 3, Coballoy 4 has reduced carbon content. In contrast, Coballoy 4 has a fairly high tungsten content. The addition of tungsten increases the wear resistance and hardness of the alloy to a certain extent, thus making up for the reduction in carbon content. At the same time, the addition of tungsten also improves the corrosion resistance of Coballoy 4. Coballoy 4 is relatively brittle and requires care when processing.

Coballoy 6

Coballoy 6 is based on Coballoy 4 with a reduced tungsten content. This significantly improves the brittleness of the alloy. Therefore, Coballoy 6 is an alloy with very balanced properties. This is why Coballoy 6 is the most widely used Coballoy alloy. While Coballoy 6 is easy to machine, it is also very easy to weld.

Coballoy 6B

Coballoy 6B is a variant of Coballoy 6. It can use hot working and heat treatment to make the material have higher plasticity than Coballoy 6. The performance of Coballoy 6B takes into account wear resistance, hardness, plasticity, brittleness, etc., and is suitable for various harsh application scenarios.

Coballoy 6K

Coballoy 6K is also a variant of Coballoy 6. Of course, its performance is also very similar to Coballoy 6B. However, Coballoy 6K has a higher carbon content, making it less malleable, making it better suited for cutting or scraping applications like making knives.

Coballoy 12

The carbon and tungsten content of Coballoy 12 is between Coballoy 3 and Coballoy 6. Therefore, its performance is also somewhere in between. This makes it work better in some niche applications. For example, the timber industry and beverage industry.

Coballoy 19

Coballoy 19's performance falls between Coballoy 12 and Coballoy 3. It is suitable for more segmented application areas. It is in relatively low demand.

Coballoy 20

Coballoy 20 is the most wear-resistant of all Coballoy alloys. It has the highest carbon and tungsten content. It takes the characteristics of Coballoy alloy to the extreme and is suitable for extreme wear resistance requirements. However, its impact resistance is relatively weak and requires special attention.

Coballoy 21

Coballoy 21 has a relatively low carbon content. At the same time, it does not contain tungsten. This results in its wear resistance being weaker among the Coballoy series alloys. However, it has a very high cobalt content, which greatly increases its high temperature resistance. At the same time, the addition of molybdenum also well complements the corrosion resistance of the alloy.

Coballoy 31

Coballoy 31 has better wear resistance than Coballoy 21. Its tungsten content also increases corrosion resistance to a certain extent. The addition of nickel makes it have excellent high temperature resistance. Due to its high temperature properties, Stelllite 31 is commonly used in gas turbine engines as well as furnace work tools.

Coballoy 190

Coballoy 190 is an alloy with extremely high wear resistance. Its wear resistance is even better than Coballoy 20. However, due to the very high carbon content, it sacrifices corrosion resistance to a certain extent. Coballoy 190 can only be machined by grinding.

Coballoy 694

Coballoy 694 is harder than Coballoy 31. Its extremely high tungsten content makes its matrix very strong, so only a small amount of carbon is needed to achieve relatively good mechanical properties. A certain amount of nickel improves the high-temperature properties of the alloy.

Contact Us

AEETHER CO., LIMITED produce cost-effective Coballoy products. If you have any requirements, you can send inquiry to our E-mail: