In order to suppress the formation of built-up edge and scale and improve the surface quality, when using carbide tools for processing, the cutting amount should be slightly lower than that of turning general carbon steel workpieces, especially the cutting speed should not be too high. Generally, the recommended cutting speed Vc=60~80m/min, the cutting depth ap=4~7mm, and the feed rate f=0.15~0.6mm/r are appropriate.