Bending Fatigue Test of Quenched and Tempered Chromium Molybdenum Steel(SCM435) under High Pressure Gaseous Hydrogen Environment

Abstract

We developed new testing machine that enables fatigue testing in the high pressure hydrogen gas environment.And, we investigated the fatigue strength of quenched and tempered chromium molybdenum steel (SCM435) with this Machine. As a result, it was confirmed that the endurance limit of this steel has almost no influence by hydrogen gas though fatigue strength at low cycle side was remarkably decreased. We think that this fatigue testing will become a powerfulmeans of materials selection of the high pressure hydrogen system components of fuel cell vehicle.