Other

Daido Tokushuko Kabushiki Kaisha

Tohoku Techno Arch Co., Ltd.

Tohoku Tokushuko Kabushiki Kaisha

Japan Industrial Technology Association

Takashi Ebata

Kiyohito Ishida

Katsunari Oikawa

Tetsuya Shimizu

Toshiharu Noda

Michio Okabe

Shigeki Ueta

Koichi Ishikawa

Takayuki Inoguchi

Provided is free cutting alloy excellent in machinability, preserving various characteristics as alloy. The free cutting alloy contains: one or more of Ti and Zr as a metal element component; and C being an indispensable element as a bonding component with the metal element component, wherein a (Ti,Zr) based compound including one or more of S, Se and Te is formed in a matrix metal phase. The free cutting alloy is more excellent in machinability, preserving various characteristics as alloy at similar levels to a conventional case. The effect is especially conspicuous, for example, when a compound expressed in a chemical form of (Ti,Zr)C(S,Se,Te)as the (Ti,Zr) based compound is formed at least in a dispersed state in the alloy structure.

Free cutting alloy

A free-cutting Ni-base heat-resistant alloy excellent in the high-temperature strength and corrosion resistance was proposed. The alloy contains Ni as a major component, 0.01 to 0.3 wt % of C and 14 to 35 wt % of Cr, and further contains at least one element selected from Ti, Zr and Hf in a total amount of 0.1 to 6 wt %, and S in an amount of 0.015 to 0.5 wt %. The alloy has dispersed in the matrix thereof a machinability improving compound phase, where such phase contains any one of Ti, Zr and Hf as a major constituent of the metal elements, essentially contains C and either S or Se as a binding component for such metal elements. The alloy also satisfies the relations of W &plus;0.53W &plus;0.27W >2W &plus;0.75W and W >0.37W , where W represents Ti content (wt %), W represents Zr content (wt %), W represents Hf content (wt %), W represents C content (wt %) and W represents S content (wt %). This successfully suppresses the amount of free S residing in the alloy, which results in an improved machinability while preventing the hot workability from being degraded.

Free-cutting Ni-base heat-resistant alloy

Disclosed is a corrosion resistant steel having good machinability with sufficient corrosion resistance in the ordinary indoor circumstances and suitable for manufacturing shafts of various small motors and OA-machines. The steel comprises, by weight %, C: 0.005-0.200%, P: up to 0.05%, Cu: up to 2.0%, Ni: up to 2.0%, Cr: 2.0-9.0%, one or both of Ti and Zr: in such an amount as &lsqb;Ti %&rsqb;&plus;0.52&lsqb;Zr %&rsqb;: 0.03-1.20%, one or both of S: 0.01-0.50% and Se: 0.01-0.40%, N: up to 0.050% and O: up to 0.030%, the balance being Fe and inevitable impurities. The steel is characterized by the inclusion therein, which are Ti-based, Zr-based or Ti-Zr-based compound or compounds containing C and one or both of S and Se.

Corrosion resistant steel

Growing community of inventors

Miyagi, Japan

Takashi Ebata