We performed the ball-on-disk tribological test for tool steels nitrided by the atmospheric-pressure pulsed-arc plasma jet to investigate improvement of the wear resistance. The test with an alumina ball proved that the plasma-jet nitriding decreases the wear rate approximately by half. Moreover, the friction coefficient, as well as the wear rate, is reduced drastically when the compound layer has been formed on the outermost steel surface. In addition, we examined the tribological properties of the locally oxidized spot undesirably formed on the steel surface during the relevant nitriding treatment. As a result, the oxidized spot can be readily removed in a few minutes even by relatively a small load.
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