The high hardness (2000 HV 30 or 93.2 HRA respectively) and the extreme bending strength (4000 N/mm²) make these types of carbide especially well-suited for the drilling of electronic boards and other fibreglass-reinforced plastics as well as the milling of difficult materials with mini millers made of K55 SF special. These difficult materials also include titanium-carbon sandwich structures, hardened steel, titanium alloys and stainless steels.

Areas of application:

• Fibreglass-reinforced plastic
• Carbon fibre-reinforced materials
• Stainless steels
• Hardened steels
• Titanium alloys
• Graphite composite materials

The extremely high resistance to wear and the important hardness of this carbide depend upon the use of superfine grain tungsten carbide powder. The specially-adapted sinter hip procedure ensures the high toughness with optimised hardness at the same time.

Grade		K20F
ISO-Classification		K10-K30
Diameter	[mm]	1.2 - 32.2
Co	[%]	9.0
WC+Cr3C2+VC	[%]	91.0
Spec. weight	[g/cm³]	14.40 ± 0.15
HC	[kA/m]	35.0 ± 2.5
4πσ	[μTm³/kg]	14.5 ± 1.5
HV30	[kg/mm²]	1920 ± 50
KIC	[MNmm-3/2]	9.3
Bending strenght (TRS)	[N/mm²]	> 4000
Porosity	A	≤ 02
	B	00
	C	00
WC grain size - Ø	[μm]	0.2 - 0.5
Binding phase		Uniform Distribution
Mixed Carbide		-
Eta-Phase		-
Applications		Drilling and Milling applications, e.g. for high wear resistance materials, for stainless steels, for composite materials like Kevlar and GRP. For high speed cutting, for dry cutting.
Dimensions		Ø 1.5+0.1 mm x 365+5.0 mm Ø 3.25+0.1 mm x 395+5.0 mm Ø 3.4 - 32.2 mm, cf. main catalog
© Konrad Friedrichs GmbH & Co. KG