B5K/B52CBN grades for finishing ductile cast iron| Coated (B5K) / Un-coated (B52)

Best CBN grades for high-speed finishing of ductile cast iron

High-speed finishing up to Vc=~500m/min

Achieves highly effective machining even surpassing ceramic


  • Ideal for finishing ductile cast iron
  • Excellent wear resistance due to optimum CBN content and TiC binders

Tooling application

Ductile cast iron
Finish Turning

Grade characteristics

Cutting conditions

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Grade Material Operation type Machining Cutting speed (m/min) Feed(mm/rev) DOC(mm) Coolant
B5K/B52 Ductile cast iron Turning Finishing 100 - 500 0.1 - 0.4 -2.0 WET

Case study

ID bore finishing operation on a machine part
Material :
Cutting speed :
200 m/min
Feed :
0.15 mm/rev
0.2 mm
Coolant :

12 pcs / corner

Competitor's CBN

6 pcs / corner

B5K achieved 2 times longer tool life machining this interrupted ID cut.
Front hub
Material :
Cutting speed :
230 m/min
Feed :
0.16 mm/rev
0.25 mm
Coolant :

50 pcs / corner

Competitor's CBN

20 pcs / corner

B52 performance resulted in 2.5 times longer tool life and stable machining performance over the competitor's CBN insert.

Tool lineup

View Catalog Information

Please check product catalog for tooling lineup