Patent ID: 7938878

Claim:
WC-Co cemented carbide comprising a composition of from about 3 to about 15 wt-% Co and Cr such that the Cr/Co-ratio by weight is from about 0.05 to about 0.15, from about 0.01 to about 0.10 wt-% N, and balance WC and in addition ppm levels of: one of the following additional elements V, Nb, Zr, Ta then with a grain size of WC of from about 0.1 to about 2.0 μm or mixtures of at least two of Ti, V, Nb, Zr, Ta, then with a grain size of the WC of more than about 0.3 up to about 2.0 μm, the ratio of Me/Co=(at-% Ti+at-% V+at-% Nb+at-% Zr+at-% Ta)/at-% Co is lower than or equal to about 0.014-(CW_Cr)*0.008 and higher than about 0.0005, with a CW_Cr ratio of from about 0.79 to about 0.95, with CW_Cr=(magnetic-% Co+1.13*wt % Cr)/wt % Co where magnetic-% Co is the weight percentage of magnetic Co and wt-% Co is the weight percentage of Co in the cemented carbide.