MITSUBISHI MATERIALS CORPORATION
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CBN(CUBIC BORON NITRIDE)
  • 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.
 Micro-Structure of MB8025
  Micro-Structure of MB8025
SELECTION STANDARD
TURNING
Heat Treated Steel
Workpiece Cutting
Mode		 Recommended Grade Recommended Cutting Condition
Cutting Speed (m/min) Feed (mm/rev) Depth of Cut (mm)
Heat Treated Steel

Structural Steel
Esp. Carburized Steel

High Alloy Steel

 35-65
HRC		 High speed
finish cutting		 MBC010 250 (150-400) -0.2 -0.2
Continuous cutting
for general purpose		 MB8025 200 (120-250) -0.3 -0.5
Continuous cutting
for general purpose		 120 (70-150) -0.2 -0.3
High speed
finish cutting		 MB810 200 (150-300) -0.15 -0.15
Continuous to light
interrupted cutting		 MB820 120 (70-150) -0.3 -0.5
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
Workpiece Workpiece
Structure		 Cutting Speed (m/min) Feed
(mm/rev)		 Depth of Cut
(mm)		 Coolant
Gray Cast Iron FC250 Ferritic + Pearlitic -0.5 -1.0 Dry,Wet
FC300 Pearlitic
Alloy Cast Iron Pearlitic -0.4 -0.5 Dry,Wet
Ductile Cast Iron FCD400 Ferritic -0.4 -0.5 Dry,Wet
FCD700 Ferritic + Pearlitic
Pearlitic
Sintered Alloy
Workpiece Recommended Grade Recommended Cutting Condition
Cutting Speed (m/min) Feed (mm/rev) Depth of Cut (mm)
High Hardness Iron Type Sintered Metal MB710 200 (150-250) -0.1 0.15 (0.1-0.2)
Sintered Forged Products MB820 150 (100-200) -0.1 0.15 (0.1-0.2)
Valve Seat MB730 70 (50-100) -0.1 0.3 (0.1-0.5)
Wear Resistant Parts MB820 120 (100-150) -0.1 0.15 (0.1-0.2)
Roll
Workpiece Grade Recommended Cutting Condition
Cutting Speed (m/min) Feed (mm/rev) Depth of Cut (mm)
Cast Steel
Adamite Cast Steel
 MB820 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		 MB820 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 20 (10-30) -0.2 -0.2
Heat Resistant Alloy
Workpiece Grade Recommended Cutting Condition
Cutting Speed (m/min) Feed (mm/rev) Depth of Cut (mm)
Ni Base Heat Resistant Alloy MB730 120 (100-150) -0.2 -0.5
Co Base Heat Resistant Alloy MB730 70 (50-100) -0.2 -0.5

FEATURED AND COMPONENT
Grade Grade Features and Application Main Component
MBC010 Coated CBN for High Speed Continuous Cutting MBC010 makes the best use of special ceramic binder structure, actualizing high wear resistance.
High wear resistance enables continuous machining at high speed of over 300m/min.		 CBN(Micro Grain)
TiN
Al2O3
MB8025 New Grade for General Purpose Turning By employing a "Particle-activated Sintering Method", the new sintered CBN technology is recommended for continuous cutting from medium to high speeds. CBN(Micro Grain)
TiN
Al2O3
MB810 For High Speed Continuous Cutting It features improved wear resistance due to impregnation with larger CBN particles. CBN
TiN
Al2O3
MB820 For Continuous to Light Interrupted Cutting Grade designed for superior thermal conductivity and crater wear resistance. CBN
TiN
Al2O3
MB825 For Continuous to Medium Interrupted Cutting Excellent balance of wear resistance and fracture resistance due to introduction of micro-grain CBN particles. CBN(Micro Grain)
TiC
Al2O3
MB835 For Heavy Interrupted Cutting Improved grade employing micro-grain CBN particles.
Excellent fracture resistance for use in heavy interrupted cutting.		 CBN(Micro Grain)
TiN
Al2O3
MB710 For General Cutting General purpose grade with well balanced wear and fracture resistance. CBN
TiC
Al2O3
MB730 For High Speed Cutting Has the largest CBN content and therefore displays good thermal conductivity.
It is suitable for the high temperatures that are generated in high speed cutting.		 CBN(High Content)
Co Base Alloy
FEATURED AND COMPONENT

CUTTING PERFORMANCE
Continuous Cutting  
V-T Diagram
<Cutting Condition>
Workpiece
 : Alloy steel (60HRC)
Feed : 0.1mm/rev
Depth of Cut
 : 0.1mm
Wet Cutting
V-T Diagram
<Cutting Condition of MB710>
Workpiece
 : DIN GG25
Insert
 : TNGA160408
Feed : 0.1mm/rev
Depth of Cut
 : 0.15mm
Wet Cutting
<Cutting Condition of Ceramics>
Workpiece
 : DIN GG25
Insert
 : TNGA160408
Feed : 0.1mm/rev
Depth of Cut
 : 0.1mm
Dry Cutting
Interrupted Cutting  
Interrupted Cutting
<Cutting Condition>
Workpiece : Alloy steel (60HRC)
External Interrupted Cutting 8 Groove
Cutting Speed : 150m/min
Feed
 : 0.15mm/rev
Depth of Cut
 : 0.2mm
Dry Cutting