Chipbreaker and Grade Selection Guide for Turning Cast Iron Cast Iron
Grades
Coated SUMIBORON BNC500
SUMIBORON BN7000
Solid SUMIBORON BNS800
L7
● FC (Gray Cast Iron)
● FCD (Ductile Cast Iron)
6,000
1,500
High-speed Continuous Cutting AC4010K
3,000
BN7000
A
Our 1st recommended grade for machining cast iron AC4015K
BNS800
1,000
High-speed Continuous Cutting AC4010K
1,500
BNC500
600
1000
Our 1st recommended grade for machining cast iron AC4015K
Mill-scaled Work/Interrupted Cutting
AC420K Mill-scaled Work/Interrupted Cutting
600
AC420K
AC8025P
300
AC8025P
300
Finishing
Roughing
Finishing
Roughing
Partially Interrupted
Interrupted
Continuous
Partially Interrupted
Interrupted
Continuous
Chipbreakers
Negative Type
Positive Type
No Chipbreaker
.240
.240
EME Type
EME No Chipbreaker
EME Type
No Chipbreaker
GEGUU
ENZ
.160
.160
EGZ Type
No Chipbreaker
EGZ Type
EGZ
EMU Type
EMU Type
ENZ Type
EMU Type
.080
.080
EGU Type
EGU Type
ENZ Type
0
0
.008
.016
.024
Feed Rate f (IPR) .008 .016
.024
Sharp Edge
Strong Cutting Edge
Sharp Edge
Strong Cutting Edge
Feed Rate f (IPR)
Recommended Cutting Conditions
Cast Iron
(Red text indicates 1st recommendation)
Cutting Conditions
Min. - Max.
Workpiece Material
Cutting Process Grade
Depth of Cut a
f (IPR)
Cutting Speed v
p (inch)
Feed Rate
c (SFM)
High-speed
BN7000
.004 - .040 .020 - .240
.004 - .020
1,650 - 6,500
AC4010K
Continuous to General
.004 - .015
650 - 2,300
Gray Cast Iron (FC250, etc.)
.020 - .240
Interrupted AC4015K
.004 - .020
600 - 1,500
.020 - .240
Heavy Interrupted AC420K
.004 - .025
500 - 1,000
High-speed BNC500
.004 - .020 .020 - .240
.004 - .015
500 - 1,600
Continuous to General
AC4010K
.004 - .015
600 - 1,500
Ductile Cast Iron (FCD450, etc.)
.020 - .240
AC4015K
.004 - .020
525 - 1,300
Interrupted
.020 - .240
Heavy Interrupted AC420K
.004 - .025
400 - 800
High-speed BNC500
.004 - .020 .020 - .240
.004 - .015 .004 - .015
650 - 1,600
High-strength Ductile Cast Iron (FCD700, etc.)
Continuous to General
AC4010K
525 - 1,300
.020 - .240
AC4015K
Interrupted
.004 - .020
450 - 1,150
.020 - .240
Heavy Interrupted AC420K
.004 - .025
250 - 725
A16
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