The production of carbide involves a process the complexity of which is, in fact, extraordinary. The base materials, tungsten carbide and cobalt, are combined by applying an exceptionally wide variety of mixing ratios. By adding further materials, such as chromium, nickel, tantalum and titanium,  special characteristics can be achieved, e.g. corrosion and heat and wear resistance.

Cobalt Content and TC Grain Size Determine Wear Resistance and Toughness of a Carbide Grade

In general, smaller tungsten carbide grain sizes allow for the manufacture of carbides with a finer microstructure. A prerequisite for this is the prevention of grain growth during the sintering process by adding suitable doping components in the right amount, adjusted to the cobalt content. The latter has been determined based on the required performance specifications for the carbide. Since the specific surface of a carbide depends reciprocally on its grain size, a finely-grained carbide can adsorb more binder than a coarsely-grained TC. When considering the ISO hardness curve of a carbide in a diagram as a function of the carbide grain size and its cobalt content, the curve behaves as a decreasing polynomial function (cf. Figure 1).

Carbide Grain Size

Figure 1: (Click Text For Full Despcritption)

Illustrates this relationship by displaying the properties of the KF grades K6UF, K40UF, K44UF, and K55SF...

Figure 2:

Illustrates this relationship by displaying the properties and correlation of the Berlin Carbide grades.

An increase in cobalt content results in increased toughness while hardness and wear resistance are reduced. This opposite development of the two desirable parameters, hardness and toughness, can be countered by reducing the carbide grain size. The result is an increased hardness on account of the finer basic grain of the carbide which at the same time permits a high binding metal content as the grain structure offers a large specific surface, allowing for a high toughness. Consequently, superfine grain carbide grades offer increased hardness while maintaining toughness.

KF Carbide Grades

Select a grade to view:


Leading Cutting Tool Manufacturer
Highly balanced hardness and toughness
K44UF K20-K30 1.2-42.2 12.0 88.0 14.05 1690 ± 50 92.6 10.0 > 4000
A:  < 02
B:     00
C:     00
0.50
Leading Cutting Tool Manufacturer
Our toughest carbide for tough cutting conditions
K40XF K30-K40 1.2-42.2 10.0 90.0 14.45 1560 ± 50 91.7 11.5 3700
A:  < 02
B:     00
C:     00
0.80
Leading Cutting Tool Manufacturer
Hard and tough - our all-purpose grade
K40UF K30-K40 1.2-42.2 10.0 90.0 14.45 1620 ± 50 92.1 10.5 4000
A:  < 02
B:     00
C:     00
0.65
Leading Cutting Tool Manufacturer
Standard grade with wide range for solid carbide tools
K20F K20-K30 1.2-40.2 8.0 92.0 14.60 1720 ± 50 92.7 9.5 3200
A:  < 02
B:     00
C:     00
0.70
Leading Cutting Tool Manufacturer
The milling specialist for hard materials
K88UF K10-K20 1.2-42.2 10.0 90.0 14.35 1770 ± 50 93.0 9.8 > 4000
A:  < 02
B:     00
C:     00
0.50
Leading Cutting Tool Manufacturer
Premium carbide grade for special applications, preferred grade for diamond coating.
K6UF K05-K10 1.2-42.2 6.0 94.0 14.80 1870 ± 50 93.6 9.3 3900
A:  < 02
B:     00
C:     00
0.65
Leading Cutting Tool Manufacturer
Very hard carbide grade for special performance
K55SF K05-K10 1.2-32.2 9.0 91.0 14.35 1920 ± 50 93.7 9.3 3800
A:  < 02
B:     00
C:     00
0.20
Leading Cutting Tool Manufacturer
For challenging applications in composite materials
K5UF K05-k10 1.2-42.2 5.0 95.0 14.94 2010 ± 50 94.0 9.3 3600
A:  < 02
B:     00
C:     00
0.50

Berlin Carbide Grades

Select a grade to view:


Leading Cutting Tool Manufacturer
Fine grain type. Toughness and high hardness, recommended for diamond coatings.
DK 120 K15-K20 N/A 6.0 94.0 14.95 1620 ± 50 92.0 9.9 3200
A:  < 02
B:     00
C:     00
1.2

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Leading Cutting Tool Manufacturer
Ultra-fine grain type. Extremely high hardness and wear resistance.
DK 120 UF K10 N/A 7.0 93.0 14.70 1850 ± 50 93.0 9.6 3500
A:  < 02
B:     00
C:     00
0.7

Content also avaliable in PDF form:

Leading Cutting Tool Manufacturer
Fine grain type. High hardness and wear resistance, medium toughness.
DK 255 F K20 N/A 8.0 92.0 14.55 1720 ± 50 92.6 9.5 3800
A:  < 02
B:     00
C:     00
0.7

Content also avaliable in PDF form:

Leading Cutting Tool Manufacturer
Fine grain type. High hardness and toughness. Increased tensile strength for cutting edge stability.
DK 400 N K20-K40 N/A 10.0 90.0 14.5 1580 ± 50 91.7 11.0 4100
A:  < 02
B:     00
C:     00
0.7

Content also avaliable in PDF form:

Leading Cutting Tool Manufacturer
Ultra-fine grain type. High toughness, hardness and wear resistance. Increased tensile strength for cutting edge stability. Universal grade.
DK 460 UF K20-K40 N/A 10.0 90.0 14.45 1620 ± 50 92.0 10.6 4100
A:  < 02
B:     00
C:     00
0.6

Content also avaliable in PDF form:

Leading Cutting Tool Manufacturer
Ultra-fine grain type. Very high hardness and high toughness.
DK 500 UF K20-K30 N/A 12.0 88.0 14.05 1690 ± 50 92.4 10.4 4200
A:  < 02
B:     00
C:     00
0.5

Content also avaliable in PDF form: