Super-fine twist drill (ultra micro-grain quality carbide/High-grade high cobalt powder steel)
(K10/HRF10/NRB10£ŕ/NRB10/MR11/PR40/PRA5/NRA61/VRA201/VWA441/VWA431/SKH4C/SKH55A/ASP60C/HSS-Co10.5)
VRA201: Imported ultra micro-grain quality carbide, with excellent impact-resistance and general wear-resistance. Generally applied in worse or general equipment to machine materials of lower hardness £®HRC°‹25°„£©, discontinuous cutting and worse part fixture. Conforming to ISO K25, can replace machining of materials like M42, ASP60, MPM, HSSCo10 etc, and can get 4-6 times lifetime, it has higher performance/price ration. Comparing with SKH51, it has 15-25 times lifetime and durability.
HRF10: ultra micro-grain quality carbide, has excellent wear resistance, but its impact resistance is not so good. It is applicable for medium and low speed cutting of high hardness materials(HRC45°„-65°„) requiring thermal refining and quenching or for various materials having higher wear resistance and non-ferrous metal. Generally it is applied in good working condition\stable cutting\excellent part fixing and continuous light machining. Corresponding to ISO K10.