Other

Toshimitsu Fujii

Kiyohito Ishida

Katsunari Oikawa

Kozo Ozaki

Takayuki Shimizu

Yukinori Matsuda

Seiji Kurata

A free-cutting tool steel is provided containing Fe and C in an amount of 0.1 to 2.5 wt %, Ti and or Zr where W &plus;0.52W constitutes 0.03 to 3.5 wt %, and W represents Ti content and W represents Zr content, at least any one of S, Se and Te where W &plus;0.4W &plus;0.25W constitutes 0.01 to 1.0 wt %, and (W &plus;0.52W )/(W &plus;0.4W &plus;0.25W ) constitutes 1 to 4, and W represents S content, W represents Se content and W represents Te content; and dispersed therein a texture thereof from 0.1 to 10% in terms of area ratio in a section of a machinability improving compound phase of a metallic element component of Ti and/or Zr as major components, and a binding component for the metallic element component containing C and any one of S, Se and Te.

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Nagoya, Japan

Toshimitsu Fujii