B23/B30

High-speed finishing of gray cast iron｜ Uncoated CBNs

Best CBN grades for machining gray cast iron

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High-speed machining up to Vc=~1,200m/min 4000 SFM

Highly effective machining even surpassing ceramic

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 4000 SFM

Gray cast iron
B23 for roughing to semi-finish turning operations
B30 for semi-finish to finish turning operations

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
B23/B30	Gray cast iron	Turning	High-speed finishing	400 – 1200 1300 – 4000	0.1 – 0.5 .040 – .020	0.2 – 2.0 .008 – .080	DRY/WET

Case study

OD turning of oil pump housing
Material : Gray cast iron
Cutting speed : 250 m/min 830 SFM
Feed : 0.2 mm/rev .0079 IPR
DOC : 2.0 mm .0787 inch
Coolant : WET
B23	210 pcs / corner
Competitor’s CBN	70 pcs / corner

The B23 insert was 3 times more productive than the competitor’s insert.

Continuous ID bore operation on a cylinder block
Material : Gray cast iron
Cutting speed : 800 m/min 2660 SFM
Feed : 0.3 mm/rev .0118 IPR
DOC : 0.1 mm .0039 inch
Coolant : WET
B30	800 pcs / corner
Competitor’s CBN	500 pcs / corner

B30 achieved 1.6 times the tool life compared to competitor’s CBN.

April 23, 2025

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