Other

National Institute of Advanced Industrial Science and Technology

Japan Science and Technology Agency

Daido Tokushuko Kabushiki Kaisha

Tohoku Techno Arch Co., Ltd.

Tohoku Tokushuko Kabushiki Kaisha

Japan Industrial Technology Association

Honda Motor Co., Ltd.

Jfe Bars & Shapes Corporation

Katsunari Oikawa

Kiyohito Ishida

Takashi Ebata

Ryosuke Kainuma

Tetsuya Shimizu

Toshiharu Noda

Michio Okabe

Masahiro Ohta

Jun Sato

Toru Sukigara

Shigeki Ueta

Yuji Sutou

Ikuo Ohnuma

Kozo Ozaki

Koichi Ishikawa

Yuuki Tanaka

Toshiyuki Murakami

Takayuki Shimizu

Yukinori Matsuda

Tetsuo Shiraga

Seiji Kurata

Takeshi Kanomata

Toshihiro Ohmori

Takayuki Inoguchi

Toshimitsu Fujii

A low carbon free cutting steel can be obtained by allowing the steel to contain 0.02 to 0.15 mass % of C, 0.05 to 1.8 mass % of Mn, 0.20 to 0.49 mass % of S, more than 0.01 mass % and not more than 0.03 mass % of O, 0.3 to 2.3% of Cr, and the balance consisting of Fe and inevitable impurities, the Cr/S ratio falling within a range of between 2 and 6.

Free cutting steel

A ferromagnetic shape memory alloy comprising 25-50 atomic % of Mn, 5-18 atomic % in total of at least one metal selected from the group consisting of In, Sn and Sb, and 0.1-15 atomic % of Co and/or Fe, the balance being Ni and inevitable impurities, which has excellent shape memory characteristics in a practical temperature range, thereby recovering its shape by a magnetic change caused by a magnetic-field-induced reverse transformation in a practical temperature range.

Ferromagnetic shape memory alloy and its use

An iridium-based alloy which has L1-type intermetallic compounds dispersedly precipitated therein and has a basic composition including, in terms of mass proportion, 0.1 to 9.0% Al, 1.0 to 45% W, and Ir as the remainder. The component system containing 0.1 to 1.5% Al has L1-type intermetallic compounds dispersedly precipitated therein. The component system containing 1.5 to 9.0%, excluding 1.5%, Al has L1-type and B2-type intermetallic compounds dispersedly precipitated therein. Part of the Ir may be replaced with an element (X) (Co, Ni, Fe, Cr, Rh, Re, Pd, Pt, or Ru) and part of the Al and W may be replaced with an element (Z) (Ni, Ti, Nb, Zr, V, Ta, Hf, or Mo). The iridium-based alloy, which contains L1-type intermetallic compounds [1r(Al,W) and [(Ir, X)(Al, W, Z)] dispersedly precipitated therein, has a high melting point. The lattice constant mismatch between the L1-type intermetallic compounds, i.e., [Ir(Al, W)] and [(Ir, X)(Al, W, Z)], and the matrix is small and, hence, the iridium-based alloy is excellent in high-temperature strength and structural stability.

Iridium-based alloy with high heat resistance and high strength and process for producing the same

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 shape memory alloy comprises Co, Ni and Al with a two-phase structure comprising a &#x3b2;-phase having a B2 structure and a &#x3b3;-phase having an fcc structure, at least 40% by area of crystal grain boundaries of the &#x3b2;-phase being occupied by the &#x3b3;-phase. The shape memory alloy can be produced by a first heat treatment step comprising heating at 1200 to 1350&#xb0; C. for 0.1 to 50 hours and cooling at 0.1 to 1000&#xb0; C./minute, and a second heat treatment step comprising heating at 1000 to 1320&#xb0; C. for 0.1 to 50 hours and cooling at 10 to 10000&#xb0; C./minute.

Shape memory alloy and method for producing same

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

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

Shibata-gun, Miyagi, Japan

Katsunari Oikawa