Sandvik Intellectual Property Ab

Kerstin Lundin

Susanne Norgren

Malin Mårtensson

The present invention relates to a cuffing insert for turning in heat resistant superalloys and stainless steels comprising a very fine grained hard substrate and a coating. The substrate comprises WC from about 5 to about 8 wt % Co and from about 0.3 to about 1.5 wt % Cr. In addition to that ppm levels of Ti and Ta are present. The ratio of Me/Co=(at-% Ti+ at-% Nb+ at-% Ta)/at-% Co is lower than or equal to about 0.014&#x2212;(CW_Cr)*0.008 and higher than about 0.0005. The average sintered WC-grain size is from about 0.5 to about 0.95 &#x3bc;m and CW_Cr from about 0.75 to about 0.95. The cemented carbide body is coated with a PVD TiAlN-coating with an average composition of x being greater than about 0.4 but less than about 0.9, present as a single or multilayer coating with a total thickness of from about 1 to about 6 &#x3bc;m.

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Stockholm, Sweden

Kerstin Lundin