Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Fujitsu Corporation

Fine Sinter Co., Ltd

Hitachi, Ltd.

Honda Motor Co., Ltd.

Aisin Aw Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Sanyo Special Steel Co., Ltd.

Aisin Corporation

Eisai R&d Management Co., Ltd.

Manabu Kubota

Tatsuro Ochi

Shinya Teramoto

Kei Miyanishi

Shuji Kozawa

Suguru Yoshida

Hideo Kanisawa

Taketo Maejima

Kazuhisa Obuchi

Akira Shiga

Akihide Otonari

Yoshinori Soejima

Shinya Okamoto

Chiaki Shinohara

Miki Yamasaki

Hajime Hasegawa

Masayuki Hashimura

Tatsuya Koyama

Toshimi Tarui

Hiromasa Takada

Takeshi Nakano

Toshiharu Aiso

Koji Tanabe

Yoshiharu Tajima

Kazutaka Asabe

Hideki Matsuda

Katsumi Yoshida

Koji Obayashi

Tadashi Ohya

Takashi Koyama

Hiroshi Kuroda

Atsushi Sakaguchi

Shigeto Negi

Takanori Kato

Motoichi Murakami

Naoyuki Shimomura

Yorihisa Hoshino

Susumu Kato

Daisuke Hirakami

Takahisa Suzuki

Makiko Ito

Takahiro Fujimoto

Yasuhiro Kiyofuji

Masakazu Ishikawa

Yuichiro Kajiki

Toshikazu Shimizu

Manabu Sasho

Atsushi Mizuno

Kiichiro Tsuchida

Hideo Mizukami

Isao Shimazoe

Tatsuyuki Ootani

Tatsuhiko Abe

Tokitake Okahira

Koki Mizuno

Atsushi Murakami

Yuki Ichikawa

Naruo Miyabe

Yusuke Morita

Koji Adachi

Keisuke Chiba

Masao Ishida

Takeshi Fukui

Kazuaki Okada

Norimasa Tsunekage

Naomitsu Mizui

Tetsushi Chida

Keita Taguchi

Yasuyuki Furuta

Satoru Nakano

Hajime Saitoh

Takashi Tanaka

Osamu Kada

Ryuichi Seki

Satoru Okawa

Motohiro Nishikawa

Atsushi Nishioka

Hisashi Terae

Takenori Kasahara

Keisuke Matsuzaka

Kazumichi Kawasaki

Koichi Banno

Kazuhiro Nomoto

Kazuhiro Fujimura

Satoshi Koganemaru

Shuuji Kozawa

Yuji Adachi

Hirokazu Sato

Syuichi Nagayama

Fujiya Kawawa

Hidechiyo Tanaka

Masashi Sakakibara

Fumio Ishimoto

Osamu Kanda

Yusuke Inukai

Ryuuichi Seki

Hirotsugu Miyamoto

Yoichi Taniguchi

Junichi Nakatsuka

A crankshaft with improved fatigue strength and machinability is provided. The crankshaft includes a pin and journal, having a chemical composition of, in mass %: 0.40 to 0.60% C; 0.01 to 1.50% Si; 0.4 to 2.0% Mn; 0.01 to 0.50% Cr; 0.20 to 0.50% Al; 0.001 to 0.02% N; up to 0.03% P; 0.005 to 0.20% S; 0.005 to 0.060% Nb; 0 to 0.060% Ti; and balance Fe and impurities, wherein, for each of the pin and journal, the hardness measured at a position at a depth of ¼ of the diameter from the surface is higher than HV 245, the microstructure at that position is mainly composed of ferrite/pearlite, and the fraction of ferrite is not lower than 16%.

Crankshaft and method of manufacturing forged material for crankshaft

A crankshaft with improved seizure resistance is provided. A crankshaft () is a crankshaft including journals () and pins (), having a chemical composition of, in mass %: 0.35 to 0.40% C; up to 0.70% Si; 1.00 to 2.00% Mn; up to 0.50% Cr; up to 0.050% Al; up to 0.020% N; up to 0.020% P; 0.005 to 0.200% S; and balance Fe and impurities, each of the journals () and pins () having a surface microstructure containing tempered martensite in not less than 80 volume % and a surface hardness not higher than HV 450.

Crankshaft

Provided is a railway wheel which has excellent toughness even if the C content is as high as 0.80% or more. The chemical composition of the railway wheel of the present embodiment consists of: in mass %, C: 0.80 to 1.60%, Si: 1.00% or less, Mn: 0.10 to 1.25%, P: 0.050% or less, S: 0.030% or less, Al: 0.010 to 0.650%, and N: 0.0030 to 0.0200%, with the balance being Fe and impurities, and wherein, in a microstructure of the web part of the railway wheel, an area fraction of pearlite is 85.0% or more, an area fraction of pro-eutectoid cementite is 0.90 to 15.00%, and an average value of a width W of the pro-eutectoid cementite defined by Formula (3) is less than 0.70 μm:=½×(/2−((/2)−4))  (3)

Railway wheel

The railway wheel according to the present embodiment has a chemical composition consisting of: in mass %, C: 0.80 to 1.15%, Si: 0.45% or less, Mn: 0.10 to 0.85%, P: 0.050% or less, S: 0.030% or less, Al: 0.200 to 1.500%, N: 0.0200% or less, Nb: 0.005 to 0.050%, Cr: 0 to 0.25%, and V: 0 to 0.12%, with the balance being Fe and impurities, wherein at least in the microstructure of the rim part and the web part, the amount of pro-eutectoid cementite defined by Formula (1) is 2.00 pieces/100 μm or less:Amount of pro-eutectoid cementite(pieces/100 μm)=a total sum of the number of pieces of pro-eutectoid cementite which intersect with two diagonal lines in a square visual field of 200 μm×200 μm/(5.66×100 μm)×100  (1).

A plant control system and communication method are capable of immediately dealing with wrong address settings created due to a human error during the execution of an opening procedure. In the plant control system, a higher-level device and a plurality of communication terminal devices are connected to each other through a communication path. Prior to the start of communication, a communication opening process of sequentially transmitting a call signal from the higher-level device to the terminal devices and acknowledging response signals therefrom is executed, which is followed by sequentially transmitting a call signal from the higher-level device to the terminal devices and receiving response signals from the terminal devices. The communication terminal devices compare addresses of the response signals returned from the other terminal devices to the higher-level device against an address set for local terminal devices. If a duplicate address exists, communication from the local terminal device is locked.

Communication device and communication method for plant control system

A railway wheel having, in mass %, C: 0.80 to 1.15%, Si: 1.00% or less, Mn: 0.10 to 1.25%, P: 0.050% or less, S: 0.030% or less, Al: 0.025 to 0.650%, N: 0.0030 to 0.0200%, Cr: 0 to 0.60%, and V: 0 to 0.12%, with the balance being Fe and impurities. The railway wheel has a hub part, a rim part including a tread and a flange, and a web part disposed between the hub part and the rim part. The area fraction of pearlite in the hub, web, and rim parts is 95% or more, and the amount of pro-eutectoid cementite is not more than 1.0 pieces/100 &#x3bc;m. The amount of pro-eutectoid cementite is calculated as (pieces/100 &#x3bc;m)=a total sum of the number of pieces of pro-eutectoid cementite which intersect with two diagonal lines in a square visual field of 200 &#x3bc;m&#xd7;200 &#x3bc;m/(5.66&#xd7;100 &#x3bc;m).

Method for producing railway wheel and railway wheel

A crankshaft with improved seizure resistance is provided. A crankshaft includes a journal and a pin, each of the journal and pin having such a surface geometry that the arithmetical mean height of the primary profile, Pa, is 0.090 &#x3bc;m or smaller and the reduced peak height Rpk is 0.070 &#x3bc;m or smaller. As used herein, arithmetical mean height of a primary profile Pa is defined in JIS B 0601 (2001), and reduced peak height Rpk is defined in JIS B 0671 (2002).

Crankshaft and method of manufacturing the same

There is provided a sintered friction material for railway vehicles that has excellent frictional properties and wear resistance even in a high speed range of 280 km/hour or more. The sintered friction material for railway vehicles is a green compact sintered material containing, in mass %, Cu: 50.0 to 75.0%, graphite: 5.0 to 15.0%, one or more selected from the group consisting of magnesia, zircon sand, silica, zirconia, mullite, and silicon nitride: 1.5 to 15.0%, one or more selected from the group consisting of W and Mo: 3.0 to 30.0%, and one or more selected from the group consisting of ferrochromium, ferrotungsten, ferromolybdenum, and stainless steel: 2.0 to 20.0%, with the balance being impurities.

Sintered friction material for railway vehicles and method for producing the same

There is provided a brake lining for a railway vehicle that can reduce brake squeal in braking. A brake lining for a railway vehicle is used for a disc brake system of a railway vehicle. This brake lining includes a base plate, a sintered friction material, and a friction material supporting mechanism. The friction material supporting mechanism is disposed between the base plate and the sintered friction material and supports the sintered friction material in such a manner that the sintered friction material can move with respect to the base plate. The sintered friction material has a Young's modulus of 35.0 GPa or more.

Brake lining for railway vehicle, disc brake system for railway vehicle including same, and sintered friction material to be used for brake lining for railway vehicle

A sintered friction material is formed by pressure sintering mixed powder at 800&#xb0; C. or above, the mixed powder consisting of, in mass %, Cu and/or Cu alloy: 40.0 to 80.0%, Ni: 0% or more and less than 5.0%, Sn: 0 to 10.0%, Zn: 0 to 10.0%, VC: 0.5 to 5.0%, Fe and/or Fe alloy: 2.0 to 40.0%, lubricant: 5.0 to 30.0%, metal oxide and/or metal nitride: 1.5 to 30.0%, and the balance being impurity.

Sintered friction material

A railway wheel is capable of suppressing formation of pro-eutectoid cementite even if the C content is high. The railway wheel has a chemical composition consisting of: in mass %, C: 0.80 to 1.15%; Si: 0.45% or less; Mn: 0.10 to 0.85%; P: 0.050% or less; S: 0.030% or less; Al: 0.120 to 0.650%; N: 0.0030 to 0.0200%; Cr: 0 to 0.25%; and V: 0 to 0.12%, with the balance being Fe and impurities, wherein an amount of pro-eutectoid cementite, which is defined by Formula (1), in a microstructure of the railway wheel is not more than 1.50 pieces/100 &#x3bc;m: Amount of pro-eutectoid cementite (pieces/100=a total sum of the number of pieces of pro-eutectoid cementite which intersect with two diagonal lines in a square visual field of 200 &#x3bc;m&#xd7;200 &#x3bc;m/(5.66&#xd7;100 &#x3bc;m) (1).

To provide a railway wheel which is excellent in corrosion fatigue resistance. The railway wheel according to the present embodiment has a chemical composition consisting of: in mass %, C: 0.65 to 0.80%, Si: 0.10 to 1.0%, Mn: 0.10 to 1.0%, P: not more than 0.030%, S: not more than 0.030%, Cr: 0.05 to 0.20%, Sn: 0.005 to 0.50%, Al: 0.010 to 0.050%, N: 0.0020 to 0.015%, Cu: 0 to 0.20%, Ni: 0 to 0.20%, Mo: 0 to 0.20%, V: 0 to 0.20%, Nb: 0 to 0.030%, and Ti: 0 to 0.030%, with the balance being Fe and impurities. A plate portion has a matrix structure composed of pearlite.

A steel for cold forging has a predetermined chemical composition, satisfies d+3&#x3c3;&#x2264;10.0 and SA/SB&#x3c;0.30, includes 1200/mmor more of sulfides having an equivalent circle diameter of 1.0 to 10.0 &#x3bc;m in a microstructure, and has an average distance between the sulfides of less than 30.0 &#x3bc;m. Here, d is an average value of equivalent circle diameters of sulfides having an equivalent circle diameter of 1.0 &#x3bc;m or more, &#x3c3; is a standard deviation of the equivalent circle diameters of the sulfides having an equivalent circle diameter of 1.0 &#x3bc;m or more, SA is the number of sulfides having an equivalent circle diameter of 1.0 &#x3bc;m or more and less than 3.0 &#x3bc;m, and SB is the number of the sulfides having an equivalent circle diameter of 1.0 &#x3bc;m or more.

Steel for cold forging and manufacturing method thereof

In this steel component, the concentration of C in a surface layer is 0.85 mass % or more to 1.2 mass % or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remainder of the surface layer is a martensitic structure, the area fraction of grain boundary carbides in the surface layer is lower than 2%, a layer inside the surface layer is higher than the surface layer in a volume ratio of a retained-austenite structure, and in the layer inside the surface layer, the remainder is a martensitic structure.

Steel component, gear component, and producing method for steel component

There is provided a hot forging steel including, by mass %, C: more than 0.30% and less than 0.60%, Si: 0.10% to 0.90%, Mn: 0.50% to 2.00%, S: 0.010% to 0.100%, Cr: 0.01% to 1.00%, Al: more than 0.005% and 0.100% or less, N: 0.0030% to 0.0200%, Bi: more than 0.0001% and 0.0050% or less, Ti: 0% or more and less than 0.040%, V: 0% to 0.30%, Ca: 0% to 0.0040%, Pb: 0% to 0.40%, and a remainder including Fe and impurities, in which P and O in the impurities are respectively P: 0.050% or less and O: 0.0050% or less, an expression d+3&#x3c3;&#x3c;20 is satisfied, and a presence density of MnS having an equivalent circle diameter of smaller than 2.0 &#x3bc;m is 300 pieces/mmor more in a cross section parallel to a rolling direction of a steel.

Hot forging steel and hot forged product

Growing community of inventors

Tokyo, Japan

Manabu Kubota