Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Waseda University

Jcr Pharmaceuticals Co., Ltd.

Tokyo Metropolitan Institute of Medical Science

Atsushi Mizuno

Manabu Kubota

Masayuki Hashimura

Kei Miyanishi

Shuji Kozawa

Hiroshi Hagiwara

Kenichiro Naito

Hajime Saitoh

Hiroshi Hirata

Kohichi Isobe

Shinji Takeoka

Tatsuro Ochi

Manabu Ito

Toshiharu Aiso

Kenichiro Miyamoto

Yosuke Obata

Shoji Tajima

Natsuko Nishiyama

Yoshito Takeuchi

Seiji Ito

Jun Aoki

Katsuji Ohta

The present invention is steel for surface hardening for machine structural use which contains, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 0.35 to less than 1.5%, and Al: 0.01 to 0.5%, is restricted to B: less than 0.0003%, S: 0.0001 to 0.021%, N: 0.003 to 0.0055%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, has a ratio Mn/S of Mn and S satisfying 70 to 30,000, has a balance of Fe and unavoidable impurities, and, when nitrided, then induction hardened, has a surface hardenability of a Vicker's hardness when tempered at 300&#xb0; C. of 650 or more.

Steel for surface hardening for machine structural use and part for machine structural use

Steel for machine structure use excellent in tool lifetime in a broad range of cutting speeds regardless of continuous machining, intermittent machining, or other systems and further in various machining environments such as use of a cutting fluid or a dry, semidry, and oxygen enriched environment, having a chemical composition containing, by mass %, C: 0.01 to 1.2%, Si: 0.005 to 3.0%, Mn: 0.05 to 3.0%, P: 0.0001 to 0.2%, S: 0.0001 to 0.35%, N: 0.0005 to 0.035%, and Al: 0.05 to 1.0%, satisfying [Al %]&#x2212;(27/14)&#xd7;[N %]&#x2267;0.05%, and having a balance of Fe and unavoidable impurities and forming an AlOcoating on the surface of a cutting tool by machining using a cutting tool coated on the surface contacting the machined material by metal oxides with a value of a standard free energy of formation at 1300&#xb0; C. of that value of AlOor more, and a machining method of the same.

Steel for machine structure use excellent in cutting tool lifetime and machining method of same

Steel for machine structure use for surface hardening containing, by mass %, C: 0.3 to 0.6%, Si: 0.02 to 2.0%, Mn: 1.5% to 3.0%, W: 0.0025 to 0.5%, Al: 0.001 to 0.5%, N: 0.003 to 0.02%, S: 0.0001 to 0.025%, P: 0.0001 to 0.03%, and O: 0.0001 to 0.0050%, having an Mn/S of 70 to 30000, and having a balance of substantially Fe and unavoidable impurities.

Steel for machine structure use for surface hardening and steel part for machine structure use

Provided is a hot-working steel excellent in machinability and impact value comprising, in mass %, C: 0.06 to 0.85%, Si: 0.01 to 1.5%, Mn: 0.05 to 2.0%, P: 0.005 to 0.2%, S: 0.001 to 0.35%, and Al: 0.06 to 1.0% and N: 0.016% or less, in contents satisfying Al&#xd7;N&#xd7;10&#x2266;96, and a balance of Fe and unavoidable impurities, total volume of AlN precipitates of a circle-equivalent diameter exceeding 200 nm accounting for 20% or less of total volume of all AlN precipitates.

Hot-working steel excellent in machinability and impact value

The present invention provides a gear, continuously variable transmission, constant velocity joint, hub, or other steel part superior in surface fatigue strength compared with the past and method of production of the same, that is, provides a carbonitrided induction hardened steel part made of steel comprised of a specific composition of chemical ingredients and carbonitrided, then treated by induction hardening, the steel part characterized in that a surface N concentration is 0.1 to 0.8 mass %, a sum of an N concentration and C concentration is 1.0 to 2.0 mass %, an amount of surface residual austenite is less than 15 vol %, a depth of the incompletely hardened layer from the surface is less than 5 &#x3bc;m, and a surface X-ray diffraction half width is 6.0 degrees or more, and a method of production of the same.

Carbonitrided induction hardened steel part superior in surface fatigue strength at high temperature and method of production of same

The present invention provides an amphiphilic molecule having a plurality of zwitterionic functional groups in its hydrophilic moiety and a molecular assembly comprising the amphiphilic molecule as a constituent lipid. The molecular assembly of the present invention forms a stable vesicular structure under a physiological pH environment to carry a substance of interest in the vesicular structure, and can release the substance of interest to the outside of the vesicular structure when it is deformed under an acidic pH environment. The molecular assembly of the present invention can be used as a carrier for a drug, a probe, a nucleic acid, a protein or the like.

Amphiphilic molecule, molecular assembly comprising the amphiphilic molecule, and use of the molecular assembly

The present invention provides steel superior in machinability comprised of, by wt %, C: 0.005 to 0.2%, Si: 0.001 to 0.5%, Mn: 0.2 to 3.0%, P: 0.001 to 0.2%, S: 0.03 to 1.0%, T.N: 0.002 to 0.02%, T.O: 0.0005 to 0.035%, and the balance of Fe and unavoidable impurities, said steel satisfying one or both of Mn/S in the steel being 1.2 to 2.8 or an area ratio of pearlite over a grain size of 1 &#x3bc;m in a microstructure of the steel being not more than 5%.

Method of production of steel superior in machinability

Superior in machinability and method of production of same

Growing community of inventors

Tokyo, Japan

Atsushi Mizuno