Abstract: Al2O3 was used to test the frictional properties of GC2025 high hardness alloy, and TC4 and 9 CrSi were compared to analyze the effect of load on the sliding wear behavior of GC2025 high hardness tools in non-consumable vacuum smelting.The results show that when the load increases from 2.5 N to 20 N,the friction coefficient of GC2025 high hardness alloy decreases.After increasing the load, the GC2025 high hardness alloy and the contrast alloy show a linear increase in wear.Compared with TC4 alloy and 9 CrSi alloy, GC2025 high hardness alloy is more suitable for a large load environment.When treated with a small 2.5 N load, furrows parallel to the sliding direction are formed on the wear marks.After increasing the load gradually, more attachments are formed on the surface of the sample and the furrows are covered over a larger area.After increasing the load, irregular exfoliations with a size of 5 μm are formed in wear debris.In the load range of 2.5-10 N,the wear mark depth of GC2025 high hardness alloy increases linearly.When the load continues to increase from 10 N to 20 N,the depth of wear marks formed on the surface remains basically constant.Compared with TC4,The GC2025 high hardness alloy has a lower wear rate.