The　effect　of　heat　treatment　on　the　microstructure,　hardness　and　wear　resistance　of　modified　hypereutectic　high　chromium　cast　iron　(HCCI)　was　investigated.　The　results　show　that　the　quenching　treatment　partially　dissolves　the　edges　of　the　primary　carbides,　and　the　sharp　corners　become　rounded　and　blunt.　As　the　quenching　temperature　increases,　the　carbide　re-dissolves　into　the　matrix,　and　the　hardness　and　wear　resistance　first　increase　and　then　decrease.　The　hardness　and　wear　resistance　are　the　best　when　quenched　at　1000　°C.　After　tempering,　the　martensite　is　transformed　into　tempered　martensite,　and　the　precipitation　of　secondary　carbides　increases.　As　the　tempering　temperature　increases,　the　secondary　carbides　gradually　become　coarser.　When　the　tempering　temperature　is　500　°C,　the　hypereutectic　HCCI　shows　the　highest　hardness　and　the　best　wear　resistance.　When　tempered　at　400　°C,　hypereutectic　HCCI　shows　the　best　erosion　and　wear　resistance.　©　2021　Walter　de　Gruyter　GmbH,　Berlin/Boston.