B5K/B52

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

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

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High-speed finishing up to Vc=~500m/min 1600 SFM

Achieves highly effective machining even surpassing ceramic

Ductile cast iron
Finish Turning

Cutting conditions

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Grade	Material	Operation type	Machining	Cutting speed (m/min) Cutting speed (SFM)	Feed(mm/rev) Feed(IPR)	DOC(mm) DOC(inch)	Coolant
B5K/B52	Ductile cast iron	Turning	Finishing	100 – 500 300 – 1600	0.1 – 0.4 .004 – .016	0.3 – 2.0 .0008”/rev	WET

Case study

ID bore finishing operation on a machine part
Material : Ductile cast iron (FCD700)
Cutting speed : 200 m/min 670 SFM
Feed : 0.15 mm/rev .0059 IPR
DOC : 0.2 mm .0079 inch
Coolant : WET
B5K	12 pcs / corner
Competitor’s CBN	6 pcs / corner

The B5K insert was 3 times more productive than the competitor’s insert.

Front hub
Material : Ductile cast iron (FCD450)
Cutting speed : 230 m/min 770 SFM
Feed : 0.16 mm/rev .0063 IPR
DOC : 0.25 mm .0098 inch
Coolant : WET
B52	50 pcs / corner
Competitor’s CBN	20 pcs / corner

B52 achieved 1.6 times the tool life compared to competitor’s CBN.

April 23, 2025

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