Abstract: The self-developed new type ADVANS 450W martensitic wear resistant steel was heated to 900,1 050 and 1 200 ℃ for 30 min for austenization respectively,then oil quenched and tempered at 300 ℃ for 2 h,then aircooled.The impact abrasive wear resistance of the steel relative to high manganese steel ZGMn13 was investigated on MLD-10 type impact abrasive wear tester under 3.5 J impact energy,brown corundum abrasive and quartz sand abrasive respectively.The volume fraction of retained austenite in the wear surface of steel was measured by using X-ray diffraction before and after wear test,the wear mechanism was analyzed by SEM.The results show that a higher hardness and good matching of strength and toughness were able to achieved in the steel after austenitizing at 900 ℃,then quenching and tempering.The impact abrasive wear resistance of the steel was always superior to that of high manganese steel under different abrasive and conditions.The hardness of worn surface on all the steel samples was obviously heightened after wear test,the certain depth plastic deformation layer was observed on worn surface,the retained austenite transformed to martensite.The primary wear mechanism was micro-cutting under the condition of brown corundum abrasive,and which was plastic deformation and micro-fatigue under the condition of quartz sand abrasive.