Panzer, S.S.PanzerReichmann, A.A.ReichmannSchiller, S.S.Schiller2022-03-082022-03-081995https://publica.fraunhofer.de/handle/publica/303273Paper knife for the perforation cut for paper-processing machines are disposable knives and are made of tempered and hardened steel in the wear-prone part of the cutting edge or the teeth are hardened using electron or laser radiation so that a much greater hardness is available in this region. There is also a more finely distributed martensite in this region. The process according to the invention is executed in such a way that the wear-prone part of the paper knife is treated by applying an electron or laser beam in a short-term hardening process with self-quenching.de608667670620patent1993-4328961