Abstract: Erosive wear resistance of precipitation hardening steel 0Cr17Ni7Al was investigated via self-made solid-liquid two-phase-flow erosive wear tester,and the effect of heat treatment on the erosive wear resistance of the steel was studied. Furthermore,through comparison with H₁₃ steel which has the similar hardness with the steel,its erosive wear mechanism was also discussed. The experimental results show that the specimens undergone solid solution treatment at 1 040℃ and aged at 520℃ present the best erosive wear resistance. As erosive time increases,the weight loss ratio of steel 0Cr17Ni7Al increases first and then keeps at a stable value,showing a noticeable influence by work hardening rate and erosive angle. As the erosive angle increases from 15° to 90°,the weight loss due to erosive wear increases first and then decreases with the maximum value at 45°. Steel 0Cr17Ni7Al has better wear-resistant properties at small angles than H₁₃ steel while they have basically the same erosion maximum. Based on surface morphology observation,the erosive wear mechanism of slurry on materials in the research is mainly extrusion. Therefore,higher strength and hardness is beneficial for improving erosive wear resistance.