Patent ID: 7427310

Claim:
A cemented carbide tool insert/button for mining and construction comprising: a cemented carbide body comprising hard constituents in a binder phase of Co and/or Ni, and at least one surface portion and an interior portion, wherein the surface portion has a WC grain size smaller than the interior portion, wherein the surface portion with the smaller WC grain size has a lower binder phase content than the interior portion, wherein the surface portion contains Cr, and a ratio of parameter A to parameter B is greater than 3.0, where parameter A=[(wt-% Cr/wt-% binder phase)+0.01] in the surface portion and parameter B=[(wt-% Cr/wt-% binder phase)+0.01] taken at a part of the cemented carbide body having the lowest Cr content, wherein a maximum in Co-content occurs at a location in the cemented carbide body between an outermost surface of the surface portion and an outermost region of the interior portion, and wherein the Co-content in a region inward of the location of the maximum in Co-content is lower than the maximum.