Fine-grained WC-based cemented carbides
The composition of the fine-grained WC-based cemented carbides for rotary cutting tools (RCT) is virtually identical to that of the standard cemented carbides for tribological and wear applications. The RCT grade differs from the standard one by containing small additions of Cr and V carbides that serve as WC grain growth inhibitors.
Fine-grained cemented carbides surpass the conventional grades in hardness, toughness, and bending strength. The fine-grained grades also demonstrate excellent resistance to diffusion wear and buildup of the workpiece material.
Structural, low-alloyed steel
Grey, malleable, high-strength cast iron grades
Hardened steels Refractory,
|Chemical analysis, wt%||WC-90, Cr3C2/VC-1, Co-9||WC-87, Cr3C2/VC-1, Co-12|
|Microstructure feature size, micron||0.6 - 0.8||0.4 - 0.6|
|Transverse rupture strength, MPa||≥ 4000
|Rockwell hardness, HRA||92.5||92.5|
|Vickers’ hardness HV30, GPa||16.4||17.1|
|Fracture toughness, MPa m½||12.0 - 15.0||12.0 - 15.0|