Coated Cemented Carbide Tool for Steel Roughing Applications

A steel roughing grade coated cemented carbide cutting tool comprises WC grains equal to or less than 70 w/o of the tool substrate, from about 5 to about 10 w/o of a cobalt bonding phase and the remainder being metal carbide grains selected from the group TiC, TaC, NbC, HfC and combinations thereof. The average WC grain size is from about 0.9 to about 1.3 microns and less than 10% of the WC grains have a size less than 0.5 microns. The coated cemented carbide tool is coated with an adherent refractory coating layer. The coated cemented carbide cutting tool for the steel roughing applications can be  machining steel at rough and heavy rough cutting conditions.

The new and improved coated cemented carbide cutting tool as previously described comprises the following steps:a steel work piece on a lathe is turned at an effective speed of up to about 275 surface feet per minute for rough cutting and up to about 130 surface feet per minute for heavy rough cutting. The new and improved coated cemented carbide cutting tool is moved across the surface of said steel work piece at a feed rate from about 0.01 to about 0.04 inches per revolution for rough cutting and from about 0.050 to about 0.080 inches per inches per revolution for heavy rough cutting. The steel workpiece is cut with the new and improved coated cemented carbide cutting tool to effect a depth of cut of about 0.125 to about 0.500 inches for rough cutting and about 0.150 to about 0.500 inches for heavy rough cutting.

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