Patent ID: 6220797
Filing Date: 2001-04-24
Classification: C23C,Y10T

Abstract:
A surface treated steel cutting tool made from a base material and comprising a cutting part having a chamfered cutting edge and formed with a surface hardening layer, and (a) with a hard coating film layer formed on the surface hardening layer, and the hard coating film layer being made from at least one member selected from the group of nitrides, carbides and carbonitrides of at least one member selected from the group of Al, Ti, Zr, Hf, V, Nb, Ta and Cr metals and their alloys, or (b) with an intermediate hard coating film layer formed on the surface hardening layer, and with a hard coating film layer formed on the intermediate hard coating film layer, the intermediate hard coating film layer being made from at least one member selected from the group of nitrides, carbides and carbonitrides of at least one member selected from the group of Ti, Zr, Hf, V, Nb, Ta and Cr metals and their alloys, and the hard coating film layer being made from at least one member selected from the group of nitrides, carbides and carbonitrides of a Ti--Al alloy.