Cubic Boron Nitride (CBN) is transformed from hexagonal boron nitride (white graphite) under high temperature and high pressure. It is a advanced cutting tool material developed in the 1970s.
Main Advantages of CBN Cutting Tools
1. Extremely High Hardness & Wear Resistance
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Reaches 3,500 – 4,500 HV
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Second only to diamond
2. Excellent Thermal Stability
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No oxidation at 1,300°C (2,370°F)
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Chemically inert with most metals and ferrous materials
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Enables high-speed cutting of hardened steels and heat-resistant alloys
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Minimal adhesion and diffusion wear
3. Good Thermal Conductivity & Low Friction
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High thermal conductivity
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Low coefficient of friction when machining iron and steel
4. Balanced Mechanical Properties
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Bending strength and fracture toughness ceramics and carbide
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Suitable for rough and semi-finish machining of chilled cast iron
Additional Features
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High-speed machining capabilities: Can machine difficult-to-cut materials such as high-temperature alloys and thermal spray coatings at high speeds
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Sintered CBN inserts: CBN can be sintered with carbide to form a composite. This sintered CBN body achieves a bending strength of up to 1.47 GPa and can be reground for multiple uses
Important Note
For general-purpose machining of common materials, high-speed steel (HSS) and carbide remain the primary choices. Superhard materials like CBN are only economical when machining very hard materials or performing ultra-precision finishing.
Selection Guide by CBN Content Percentage
| CBN Content | Typical Application |
|---|---|
| 50% CBN | Continuous cutting of hardened steel (45–65 HRC) |
| 65% CBN | Interrupted cutting of hardened steel |
| 80% CBN | Machining chilled cast iron; heavy-duty interrupted cutting of hardened steel |
| 90% CBN | High-speed cutting of cast iron (vₐ = 500–1,300 m/min); interrupted cutting of hardened steel, carbide, sintered metals, etc. |
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Beyond supplying high-performance carbide inserts, we deliver a comprehensive service ecosystem. Our technical team provides application support, failure analysis, and customized grades/geometries for your unique automotive processes. We excel in tool management—from inventory optimization and tool kitting to performance monitoring and data-driven cost-per-part reduction. With strong engineering capabilities and rapid response, we don’t just sell tools; we partner to lower your manufacturing costs, increase spindle uptime, and ensure consistent thread quality across high-volume production. Whether you need a trial recommendation or a full tooling solution, our team is ready to support you.
