Machinability of Deoxidized Steel

Abstract

The machinability should be evaluated by the combination of cut steels and cutting tools. Tool life by turning with combinations of various deoxidized steels and various tools are studied.Si killed, Ca-Si killed, Si-Al killed, Ca-S:-Al killed constructional steels were selected.P20 type of sintered carbide and SKH 4 A type of high speed steel were tested as tools.
Non-metallic inclusions are different from each other corresponding to the killing process and affect the cutting process. The cutting process by the sintered carbide tool is distinguished from that by high speed steel tool.The sintered carbide being used, sometimes nonmetallic inclusion of Ca-silicate or Mn-silicate adheres on the surface of tool, works effectively and prolongs the tool life.Usually, it affects adversely the cutting process by high speed steel.Non-metallic inclusions of Al₂O₃ gives some bad effects on the both tools.Sulphide inclusion improves the life of high speed steel tool more than that of sintered carbide tool.