Other

Daido Tokushuko Kabushiki Kaisha

Seiji Kurata

Kiyohito Ishida

Shigeki Ueta

Tetsuya Shimizu

Katsunari Oikawa

Kozo Ozaki

Yukinori Matsuda

Takayuki Shimizu

Toshimitsu Fujii

Tomomi Yamamoto

The invention provides a hard-particle powder for sintered body, which contains, by mass %, 2% to 3.5% of Si, 6% to 10% of Cr, 20% to 35% of Mo, 0.01% to 0.5% of REM, and the remainder being Co and unavoidable impurities. The invention further provides a sintered body obtained through a mixing step of mixing the above-mentioned hard-particle powder for sintered body with a pure iron powder and a graphite powder to obtain a powder mixture, a forming step of compacting the powder mixture to obtain a compact, and a sintering step of sintering the compact. The hard-particle powder according to the invention has the effect of giving a sintered body having improved wear resistance without substantially impairing powder characteristics and sintering characteristics. Additionally, the sintered body according to the invention has the effect of having excellent wear resistance.

Hard-particle powder for sintered body and sintered body

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.

Free-cutting tool steel

Growing community of inventors

Nagoya, Japan

Seiji Kurata