CBN (Cubic Boron Nitride)

High hardness and heat resistance for cutting high hardness steel and

hard cast iron. Long tool life with high-speed finishing of grey cast iron. In 1977, Sumitomo Electric Hardmetal successfully developed a revolutionary CBN sintered tool - SUMIBORON. The main component in SUMIBORON is Cubic Boron Nitride with a special ceramic binder sintered under super high pressure and temperature. As compared to other conventional tool materials, CBN has higher hardness and excellent heat resistance. With these distinct characteristics, SUMIBORON can perform machining of hardened steel, high hardness cast iron and exotic metals where previously only grinding was done. Furthermore, excellent efficiency and longer tool life can also be achieved from high speed machining of cast irons.

Characteristics

Classifications Structure CBN Content Hardness (GPa) Grades Application Characteristics

44 HighCarbideHigh carbon content. Structure consists of
BN700
Mainly CBNBN7000Chilled cast ironstrongly fused CBN grains.
grains fusedBN7500Ni-Hard cast ironSuited to cutting cast iron, heat-resistant
togetherBNS800Heat-resistant alloy, Cast ironalloy, ultra-hard alloy, and other hard
Sintered ferrous alloymaterials.
BNC500,*
BN1000, BN2000,Alloy steelCBN grains are fused together strongly with
Mainly CBNBN350,* BNX10,
grains heldCase hardened steela special ceramic binder.
BNX20, BNX25,Carbon tool steelsStrong CBN binding force gives superior wear
together with
a binderBNC2010, BNC2020Bearing steel, Die steelresistance and toughness when cutting hardened
BNC100, BNC160,Ductile cast ironsteel and cast iron.
21 Low BNC200, BNC300
*BNC500 can also be used with cast iron,
while BN350 can also be used with sintered ferrous alloys.
Grade Range Map

Class Series Finishing ~ Light Cutting Medium Cutting Rough ~ Heavy Cutting

Classification H01 H10 H20 H30

BNC2010 BNC2020 Coated SUMIBORON BNC100

BNC160 BNC200 BNC300 BNX10, BN1000 Uncoted BN2000 SUMIBORON BNX20 BNX25, BN350

Classification01102030
BN7000 BN700,
Uncoted
SUMIBORON
BN7500
ClassificationK01K10K20K30

Coated BNC500 SUMIBORON BN7000, BN700 Uncoted BN7500

SUMIBORON BNS800