End mill formed of tungsten carbide-base sintered hard alloy

摘要

An end mill formed of a tungsten carbide-base sintered hard alloy comprising a binder phase including a Co-base alloy, and a hard disperse phase consisting essentially of WC in proportions of: binder phase: 6-23 wt. %, and hard disperse phase: 77-94 wt %, the binder phase having a composition of: Cr: 1-15 wt. %, W: not more than 5 wt. %, and the balance of Co and inevitable impurities, the hard disperse phase having a mean grain size of 0.5-2 mu m.