Failure　of　pump　shaft　(P116-1)　of　high-pressure　water　pump　occurred　during　coke　removal.　Shaft　material　(3Cr13)　demonstrated　yield　and　tensile　strength　of　737　and　910　MPa,　respectively.　Failure　analysis　was　performed　to　determine　the　cause　of　failure,　which　was　a　fracture　at　the　pump　shaft　located　at　the　journal.　Macroscopic,　metallographic,　chemical　composition,　hardness,　SEM,　and　EDS　analyses　were　used　in　the　failure　analysis.　Metallographic　and　SEM　analyses　revealed　that　fatigue　cracks　are　related　to　corrosion　and　geometrical　shape.　Fatigue　crack　initiation　at　the　disconnected　area　of　the　chromium　plating　layer　weakened　fatigue　resistance.　Causes　of　incomplete　chromium　plating　at　the　shaft　journal　and　keyway　should　be　investigated　further.　©　2021,　ASM　International.