Abstract: An oxide coated cutting tool including a body coated with refractory single- or multilayers one of which consists of single-phase .kappa.-Al.sub.2 O.sub.3 characterized by controlled microstructure with crystal planes preferably grown in the (210)-direction with respect to the exposed sure of the coated body. The oxide coated cutting tool exhibits increased wear properties when machining ball bearing steel.

Abstract: There is disclosed a coated cutting insert particularly useful for cutting in cast iron materials. The insert is characterized by a straight WC-Co cemented carbide body having a highly W-alloyed Co binder phase, a well-defined surface content of Co and a coating including an innermost layer of TiC.sub.x N.sub.y O.sub.z with columnar grains, a layer of a fine-grained, textured Al.sub.2 O.sub.3 layer and a top layer of TiC.sub.x N.sub.y O.sub.z that has been removed along the cutting edge line.

Abstract: There is provided a coated cutting insert particularly useful for finishing operations in milling of grey cast iron. The insert has a fine-grained WC-Co cemented carbide body and a coating of multiple layers of TiC.sub.x N.sub.y deposited at conditions aiming to minimize the decarburization of the cutting edge without any negative effects on the substrate. There is also disclosed a method of applying a TiC.sub.x N.sub.y layer by CVD technique on a cemented carbide cutting insert without eta phase formation and without etching of the binder phase.

Abstract: An oxide coated cutting tool including a body coated with refractory single- or multilayers one of which consists of single-phase .kappa.-Al.sub.2 O.sub.3 characterized by controlled microstructure with crystal planes preferably grown in the (210)-direction with respect to the exposed surface of the coated body. The oxide coated cutting tool exhibits increased wear properties when machining ball bearing steel.