公开(公告)号：US20200030886A1

公开(公告)日：2020-01-30

申请号：US16337388

申请日：2017-09-25

Applicant: SANDVIK INTELLECTUAL PROPERTY AB

Inventor： Malin MARTENSSON ,  Ioannis ARVANITIDIS ,  Krystof TURBA

IPC: B23B27/14 ,  B22F9/04 ,  B22F9/02 ,  B22F3/15 ,  B22F3/24

Abstract: A rock drill insert made of cemented carbide having hard constituents of tungsten carbide (WC) in a binder phase including Co, wherein the cemented carbide includes 4-18 mass % Co and a balance of WC and unavoidable impurities. The cemented carbide also includes Cr in such an amount that the mass ratio Cr/Co is within the range of 0.04-0.19, and the difference between the hardness at a 0.3 mm depth at any point of the surface of the rock drill insert and the hardness of the bulk of the rock drill insert is at least 40 HV3.