This　study　investigates　the　effect　of　semi-solid　processing　on　the　microstructures,　mechanical　properties　of　low　carbon　Fe-B　cast　alloy.　The　as-cast　microstructure　of　Fe-B　cast　alloy　consists　of　the　eutectic　boride,　pearlite,　and　ferrite.　Compared　with　the　coarse　eutectic　borides　in　the　ordinary　alloy,　the　eutectic　boride　structures　in　the　semi-solid　alloy　are　greatly　refined.　Moreover,　the　boride　area　fraction,　Rockwell　hardness,　impact　toughness,　etc.,　before　and　after　heat　treatment　under　different　casting　methods　are　also　investigated　systemically.　The　wear　behaviors　of　low　carbon　Fe-B　cast　alloy　are　studied　by　three-body　abrasive　wear　tester.　The　wear　weight　loss　of　semi-solid　Fe-B　cast　alloy　is　lower　than　that　of　the　ordinary　Fe-B　cast　alloy　because　of　the　lower　average　boride　area　for　semi-solid　specimen.　Meanwhile,　the　wear　mechanism　of　the　low　carbon　Fe-B　cast　alloy　under　different　casting　process　is　depicted　and　analyzed　by　using　the　physical　models.