In turning of alloy steels, the tool wear generally increases with the increase of the cutting speed. In order to find out the effective tool materials for the high speed turning of the alloy steels, SCr420 was turned with the coated cemented carbide tools and ceramics tools. The tool wear was experimentally investigated at the cutting speed from 5.0m/s to 20.0m/s, the feed rate 0.05mm/rev and the depth of cut 0.1mm. Furthermore, the influence of the chamfer honed edge width and angle of the Al₂O₃ ceramics tool on the tool wear was also investigated. The main results obtained are as follows: (1) The Al₂O₃ ceramics tool showed the slowest wear progress at the cutting speed 20.0m/s. (2) The tool wear progress at the chamfer honed edge angle 25°became slow with the decrease of the chamfer honed edge width at the cutting speed 20.0m/s. (3) The cutting force decreased with the decrease of the chamfer honed edge width.