Things to know
about carbides

AF K34EF

K34EF is an ultra-fine grade with 9% Co. It is characterized by a very high hardness.
It finds application for plastics and graphite, at high-speed cutting and dry chipping, in the processing of high hardness materials (up to 60 HRC), also in the machining of cast iron, aluminum alloys, composite materials (CFRP and GFRP).

The grade is well suited for diamond coating.

ISO-Range K20 - K30
Chemical Data
Co (%) 9
WC incl. Doping (%) 91
Physical Data
Density (g/cm³) 14,3
Hardness
HV 30 (N/mm²) 1930
HRA 94,0
Transverse Rupture Strength
(N/mm²) > 3900
(1000 psi) > 566
KIc* (Shetty)
(MNm-3/2)   9,0
Metallogaphic Data
Porosity
A ≤ 10 µm ≤ 02
B > 10 - 25 µm 00
C 00
Microstructure
Tungsten Carbide α Ø  0,5µm
Binding Phase β unif. distr.
Mixed Carbide γ -
Eta Phase η -
* Since stated values for the KIc depend on specimen geometry and preparation, a direct comparison with values determined by using a differing method is not permitted.