Chipbreaker and Grade Selection Guide for Turning Hardened Steel
Hardened Steel
Grades
● Coated SUMIBORON, Coated Carbide
● Uncoated SUMIBORON
1,000
1,000
BNC100
BNX20
BNC160
BN1000
High-precision Machining BNC2010
BNC200
BNX25
600
600
BNC2020 General-purpose Cutting
BN2000 General-purpose Cutting
Interrupted Cutting
300
300
A
Interrupted Cutting BN350
BNC300
AC503U
(Coated Carbide)
0
0
Finishing
Roughing
Finishing
Roughing
Partially Interrupted
Partially Interrupted
Interrupted
Interrupted
Continuous
Continuous
SUMIBORON
L2
Chipbreakers
LV/FV Type Chipbreaker : For chip control during finishing of hardened steel SV Type Chipbreaker : For chip control during carburised layer removal
.028
SV Type
.024
.020
SV Type
.016
LV Type
.012
LV Type
.008
FV Type
FV Type
.004
.012
0
.004
.008
SUMIBORON Break Master
L26
Feed Rate f (IPR)
Recommended Cutting Conditions
Hardened Steel
(Red text indicates 1st recommendation)
Cutting Conditions
Min. - Max.
Cutting Process
Grade
Depth of Cut a
Cutting Speed v
f (IPR)
Feed Rate
p (inch)
c (SFM)
BNC2010
.001 - .014
.001 - .010
400 - 1000
BNC100
.001 - .012
.001 - .008
400 - 1000
Continuous Cutting
BN1000
.001 - .008
.001 - .006
400 - 1000
BNX10
.001 - .008
.001 - .006
400 - 1000
AC503U (Coated Carbide)
.001 - .040
.001 - .004
130 - 330
BNC2020
.001 - .020
.001 - .016
160 - 720
BNC160
.001 - .014
.001 - .008
400 - 820
BNC200
.002 - .020
.002 - .014
160 - 720
General Cutting
BN2000
.001 - .012
.001 - .008
160 - 660
BNX20
.001 - .020
.001 - .012
230 - 560
BNC300
.001 - .012
.001 - .008
160 - 500
BN350
.001 - .012
.001 - .008
160 - 500
Interrupted Cutting
BNX25
.001 - .020
.001 - .012
400 - 725
A20
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