HIGH STRENGTH TUNGSTEN CARBIDE GROUP SUPERHARD ALLOY-MADE MINIATURE DRILL

摘要

PURPOSE: To provide a WC group cemented carbide alloy-made miniature drill having high strength. CONSTITUTION: A miniature drill has a composition of containing by wt.% 4 to 25% Co, 0.1 to 5% V and/or Cr, 0.005 to 0.1% ZrCO and the rest of WC and unavoidable impurities, and further WC is constituted of WC group superhard alloy having a 0.7μm or less mean grain size.