HIGH PERFORMANCE TOOL COATING FOR PRESS HARDENING OF COATED AND UNCOATED ULTRAHIGH STRENGTH STEEL SHEET METALS

摘要

Coated tool for hot stamping of coated or uncoated sheet metals, in particular for hot stamping of AlSi-or Zn-coated sheet metals_[KM2], comprising a coated substrate surface to be in contact with the coated or uncoated metal sheet, wherein the coating in the coated substrate surface is a multi-layer coating comprising one or more inferior layers and one or more superior layers, where the inferior layers are deposited closer to the substrate surface than the superior layers, whereas: -the inferior layers are designed for providing load bearing capacity, -the superior layers are designed for providing galling resistance, -at least one superior layer (layer 5) is deposited having a multi-nanolayer structure formed by sublayers of the type A, B and C, said three kind of sublayers being nanolayers deposited alternate one on each other forming a sequence of the type...A/B/C/A/B/C/A..., wherein at least two sequences of one A nanolayer, one B nanolayer and one C nanolayer are deposited forming the multi-nanolayer structure -wherein: - the nanolayer of type A is composed in at least 90 at.-% of chromium and nitrogen, - the nanolayer of type B is composed in at least 90 at.-% of titanium, aluminum and nitrogen, - the nanolayer of type C is composed I at least 90 at.-% of vanadium carbon and nitrogen, and -the layer thickness of the at least one superior layer (layer 5) is not lower than 0.5 µm and not higher than 15 µm.