What materials are suitable for CBN cutting tools

CBN (Cubic Boron Nitride) cutting tools are widely used in various industries due to their exceptional hardness, heat resistance, and durability. These tools are crucial in machining applications that involve hard materials such as hardened steels, cast irons, superalloys, and other exotic materials. In this article, we will explore the materials that are most suitable for CBN cutting tools.

1. Hardened Steels:

Hardened steels are known for their high strength and resistance to wear. Commonly used in the automotive and aerospace industries, these materials require cutting tools capable of withstanding severe thermal and mechanical loads. CBN cutting tools excel in machining hardened steels, providing excellent results in terms of surface finish and tool life.

2. Cast Irons:

Cast irons are widely used in the manufacturing of engine blocks, brake discs, and other heavy-duty components. Due to their high carbon content and abrasive nature, machining cast iron can be challenging. However, CBN cutting tools are suited for this task as they exhibit superior toughness and resistance to wear, enabling efficient and precise machining of cast irons.

3. Superalloys:

Superalloys, such as Inconel and Hastelloy, are extensively used in the aerospace, energy, and chemical industries due to their exceptional high-temperature and corrosion resistance. However, these materials pose difficulties in machining due to their extreme hardness and work-hardening characteristics. CBN cutting tools offer an ideal solution for machining superalloys, allowing for efficient material removal and minimizing tool wear.

4. Exotic Materials:

Apart from hardened steels, cast irons, and superalloys, CBN cutting tools are also suitable for machining a wide range of exotic materials. These materials include titanium alloys, nickel-based alloys, and hardened tool steels. The high hardness and exceptional thermal stability of CBN tools ensure consistent performance and extended tool life when working with these demanding materials.

5. Other Applications:

In addition to the aforementioned materials, CBN cutting tools find applications in various other sectors. These include the machining of hardened bearing steels in the automotive industry, hard turning operations in the manufacturing of ball screws, and the finishing of heat-treated gears. CBN tools deliver superior results in terms of surface finish, dimensional accuracy, and overall productivity in these diverse applications.


CBN cutting tools have revolutionized the machining process by providing an effective solution for working with hard and challenging materials. Their excellent hardness, heat resistance, and durability make them highly suitable for machining hardened steels, cast irons, superalloys, and a range of exotic materials. With CBN cutting tools, industries can achieve improved efficiency, reduced downtime, and enhanced product quality in their machining operations.

What materials are suitable for CBN cutting tools