Patent Number: 6,761,853

Title: Free-cutting tool steel

Abstract: 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.sub.Ti +0.52W.sub.Zr constitutes 0.03 to 3.5 wt %, and W.sub.Ti represents Ti content and W.sub.Zr represents Zr content, at least any one of S, Se and Te where W.sub.S +0.4W.sub.Se +0.25W.sub.Te constitutes 0.01 to 1.0 wt %, and (W.sub.Ti +0.52W.sub.Zr)/(W.sub.S +0.4W.sub.Se +0.25W.sub.Te) constitutes 1 to 4, and W.sub.S represents S content, W.sub.Se represents Se content and W.sub.Te 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.

Inventors: Ishida; Kiyohito (Sendai-shi, Miyagi, JP), Oikawa; Katsunari (Shibata-gun, Miyagi, JP), Fujii; Toshimitsu (Nagoya, JP), Matsuda; Yukinori (Nagoya, JP), Ozaki; Kozo (Nagoya, JP), Kurata; Seiji (Nagoya, JP), Shimizu; Takayuki (Nagoya, JP)

Assignee: Ishida; Kiyohito

International Classification: C22C 38/52 (20060101); C22C 38/42 (20060101); C22C 38/06 (20060101); C22C 38/00 (20060101); C22C 38/18 (20060101); C22C 38/12 (20060101); C22C 38/16 (20060101); C22C 38/10 (20060101); C22C 38/48 (20060101); C22C 38/44 (20060101); C22C 38/50 (20060101); C22C 38/14 (20060101); C22C 38/46 (20060101); C22C 038/60 (); C22C 038/14 (); C22C 038/50 ()

Expiration Date: 07/12012