
High-speed finishing of gray cast iron| Uncoated CBNs
Best CBN grades for machining gray cast iron
High-speed machining up to Vc=~1,200m/min
Highly effective machining even surpassing ceramic
Features
- B23 & B30 grades have high CBN content to enhance wear resistance characteristics
- Perform ultra-high speed machining of up to Vc-1,200 m / min
Tooling application
Gray cast iron
B23 for roughing to semi-finishing turning operations
B30 for semi-finish to finish turning operations
Grade characteristics

Cutting conditions
Scroll the table →
Grade | Material | Operation type | Machining | Cutting speed (m/min) | Feed(mm/rev) | DOC(mm) | Coolant |
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B23/B30 | Gray cast iron | Turning | High-speed finishing | 400 - 1200 | 0.1 - 0.5 | -2.0 | DRY/WET |
Cost effective: Double-sided & multi-cornered CBN

Case study
OD turning of oil pump housing | |
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B23 | 210pcs / corner |
Competitor's CBN | 70pcs / corner |
- The B23 insert was 3 times more productive than the competitor's insert.
Continuous ID bore operation on a cylinder block | |
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B30 | 800pcs / corner |
Competitor's CBN | 500pcs / corner |
- B30 achieved 1.6 times the tool life compared to competitor's CBN.
Tool lineup
Please check product catalog for tooling lineup
Other recommended products
-
HC1/HW2Continuous machining of Gray cast iron| Alumina ceramic (White ceramics)
First recommendation for finishing gray cast iron
-
HC6For machining ductile cast iron| TiC ceramic + alumina
Specialized ceramic for finishing ductile iron
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SP9Roughing to finishing of Ductile Cast Iron & Gray Cast Iron| Coated Silicon Nitride Ceramic
Covers Roughing to Finishing operations
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SX6Exceptional wear resistance for rough machining of gray cast iron| Silicon nitride ceramic
First recommendation for roughing gray cast iron