COVERING TOOL FOR WARM AND HOT WORKING EXCELLENT IN LUBRICANT ADHESIVE PROPERTY AND ABRASION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a covering tool for warm and hot working excellent in seizure resistance and abrasion resistance.;SOLUTION: In the tool for warm and hot working, whose base material is a hot die steel or a high-speed steel and which is provided with a covering layer at least on its working face, the surfacemost layer of the covering layer is a layer a with surface roughness Rz: 4-15 μm, a layer b being a sulfide existing immediately below the layer a, and a layer c consisting of one or more kinds of a nitride, a carbide and a carbonitride whose principal composition is one kind or more than two kinds of metal element selected from Ti, V, Cr, Al and Si, existing immediately above the base material. The layer a consists of one or two or more kinds of Ti, V, Cr, Al, Si and Cu as a principal composition, and may preferably be provided with a 2-15 μm layer thickness. And the layer b may preferably consist of, in terms of atomic % of only metallic composition, 50% or below in total of one kind or two kinds of Ti, Cr, substantially a residual Mo, and be provided with the 0.5-10 μm layer thickness. The covering layer may preferably be covered by means of a physical deposition.;COPYRIGHT: (C)2002,JPO