MITSUBISHI MATERIALS CORPORATION
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CBN

  • Suitable for high speed finishing of heat treated steel, sintered ferrous alloy and cast iron.
  • Low affinity to iron, thus good surface finishes are possible.
  • Grinding can be replaced by machining.
CBN

SELECTION STANDARD
Heat Treated Steel
Work Material Cutting Mode Recommended Grade Recommended Cutting Conditions
Cutting
Speed
(m/min)		 Feed (mm/rev) Depth of
Cut
(mm)
Structural Steel
Esp. Carburized Steel
(SC, SCM, SCr)
High Alloy Steel
(SKD, SKH)		 HRC
35–65		 High speed finishing cutting MBC010 250 (150-400) -0.2 -0.2
Continuous cutting
for general purpose		 MBC020 200 (80-250) -0.3 -0.5
Interrupted cutting
for general purpose		 150 (60-200) -0.2 -0.3
Continuous cutting
for general purpose		 MB8025 180 (80-250) -0.3 -0.5
Interrupted cutting
for general purpose		 120 (60-150) -0.2 -0.3
High speed finishing cutting MB810 200 (150-300) -0.15 -0.15
Continuous to medium
interrupted cutting		 MB825 120 (70-150) -0.3 -0.5
Heavy interrupted cutting MB835 100 (50-120) -0.3 -0.5

Cast Iron
Work Material Workpiece
Structure		 Cutting Speed (m/min) Feed
(mm/rev)		 Depth of Cut (mm) Coolant
250 500 750 1000 1250
Gray Cast Iron JIS FC250 Ferritic + Pearlitic
image
 －0.5 －1.0
MBS140
－5.0		 Dry,Wet
JIS FC300 Pearlitic
Alloy Cast Iron Pearlitic －0.4 －5.0 Dry,Wet
Ductile Cast Iron JIS FCD400 Ferritic
image
 －0.16 －5.0 Dry,Wet
JIS FCD700 Ferritic + Pearlitic Pearlitic

Sintered Alloy
Work Material Recommended Grade Recommended Cutting Conditions
Cutting Speed (mm/min) Feed (mm/rev) Depth of Cut (mm)
General Sintered Alloy MB4020 250 (80－300) －0.2 －0.3
High Density Sintered Alloy MB4020 150 (80－250) －0.2 －0.3
Sintered Alloy MB4020, MB835 100 (80－150) －0.2 －0.3

Valve Seat
Amount of Hard Particles image
Hardness of Workpiece (HV) 150 250 300 350
Plunge Cut image
Traverse Cut image

Roll
Work Material Grade Recommended Cutting Conditions
Cutting Speed (m/min) Feed (mm/rev) Depth of Cut (mm)
Cast Steel
Adamite Cast Steel
 MB825, MB8025 80 (30－130) 0.3 (0.1－0.5) 0.2－3.0
Ductile Cast Iron
Granular Cast Iron
Chilled Cast Iron		 MB710 80 (30－130) 0.3 (0.1－0.5) 0.2－3.0
High Chromium Steel
High Alloy Steel		 MB825, MB8025 80 (30－130) 0.3 (0.1－0.5) 0.2－3.0
High Speed Steel MB730 50 (20－70) 0.25 (0.1－0.4) 0.1－3.0
Cemented Carbide MB730, MBS140 20 (10－30) －0.2 －0.2

Heat Resistant Alloy
Work Material Grade Recommended Cutting Conditions
Cutting Speed (m/min) Feed (mm/rev) Depth of Cut (mm)
Ni Base Heat Resistant Alloy (e.g. Inconel) MB730 120 (100－150) －0.2 －0.5
Co Base Heat Resistant Alloy (e.g. Stellite) MB730 70 (50－100) －0.2 －0.5
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