Patent ID: RE40026

Claim:
A cemented carbide insert provided with a thin wear resistant coating with excellent properties for machining of steels and stainless steels comprising WC, 5-12.5 wt-% Co and 0-10 wt-% cubic carbides such as TiC, TaC, NbC or mixtures thereof wherein the WC-grains have an average grain size in the range 1.0-3.0 μm the WC grains have a narrow grain size distribution in the range 0.5-4.5 μm the W-content in the binder phase expressed as the “CW-ratio” defined as CW-ratio=M s /wt%Co*0.0161 CW ⁢ - ⁢ ratio = M s ( wt . ⁢ % ⁢ ⁢ Co × 0.0161 ) where M s is the measured saturation magnetization of the sintered cemented carbide insert in kA/m hAm 2 /kg and wt % Co is the weight percentage of Co in the cemented carbide, is 0.86-0.96.