Nkk Corporation

Jfe Steel Corporation

Jfe Bars & Shapes Corporation

Other

Sony Corporation

Jtekt Corporation

Nhk Spring Co., Ltd.

Kunikazu Tomita

Toshiaki Urabe

Akihiko Nishimoto

Masaharu Jitsukawa

Yoshihiro Hosoya

Takashi Iwamoto

Keisuke Ando

Yasuyuki Takada

Ichiro Saito

Yoshihiko Oda

Nobuo Yamagami

Akira Tange

Kaoru Sato

Yoshimasa Funakawa

Kozo Harada

Takaaki Toyooka

Yasunobu Nagataki

Akio Kobayashi

Kazukuni Hase

Hideki Matsuoka

Tetsuo Yamamoto

Tatsuhiko Hiratani

Takanobu Saito

Tsuyoshi Shiozaki

Masao Goto

Hiroaki Kato

Hiroshi Nakata

Kenji Tahara

Kimihiro Nishimura

Fusato Kitano

Teruo Takeuchi

Kiyoshi Uwai

Shinji Mitao

Kanji Inoue

Tomio Aoki

Yasuhiro Omori

Hideto Kimura

Toru Inazumi

Eiji Maeda

Masayuki Kasai

Kiyoshi Kurimoto

Shogo Sato

Shiro Kenmotsu

Minoru Suwa

Hisashi Harada

Yurika Goto

Toshiyuki Murakami

Hisato Nishisaka

Tetsuo Shiraga

Katsumi Nakajima

Kazuaki Fukuoka

Chohachi Sato

Shunsaku Node

Yutaka Tamai

Kazuaki Hattori

Norihiko Mori

Yasuhiro Murao

Katsuhiko Kikuchi

Yoshihara Hosoya

A component comprising a core part and a surface layer is provided. The core part contains C: 0.01%≤ and <0.20%, Si: ≤1.0%, Mn: 1.5%≤ and ≤3.0%, P: 0.02% or less, S: ≤0.06%, Cr: 0.30%≤ and ≤3.0%, Mo: 0.005%≤ and ≤0.40%, V: 0.02%≤ and ≤0.5%, Nb: 0.003%≤ and ≤0.20%, Al: 0.010%≤ and ≤2.0%, Ti: 0.005%< and <0.025%, N: ≤0.0200%, Sb: 0.0005%≤ and ≤0.02%, and the balance consisting of Fe and incidental impurities; and a steel microstructure that contains bainite phase in an area ratio of more than 50%. The surface layer has high nitrogen and carbon contents relative to the chemical composition of the core part.

Steel for nitrocarburizing and nitrocarburized component, and methods of producing same

A case hardening steel having excellent fatigue resistance is provided at relatively low production cost. A case hardening steel has a chemical composition containing C: 0.10% to 0.30%, Si: 0.10% to 1.20%, Mn: 0.30% to 1.50%, S: 0.010% to 0.030%, Cr: 0.10% to 1.00%, B: 0.0005% to 0.0050%, Sb: 0.005% to 0.020%, and N: 0.0150% or less in a predetermined range, and further containing Al: 0.010%&#x2264;Al&#x2264;0.120% in the case where B&#x2212;(10.8/14)N&#x2265;0.0003%, and 27/14[N&#x2212;(14/10.8)B+0.030]&#x2264;Al&#x2264;0.120% in the case where B&#x2212;(10.8/14)N&#x3c;0.0003%.

Case hardening steel

A case hardening steel suitable as raw material for producing a mechanical structural part having high rotating bending fatigue strength and pitting fatigue strength at relatively low cost and a method of producing the case hardening steel are provided. A case hardening steel comprises a chemical composition containing, in mass %, C, Si, Mn, P, S, Cr, Mo, Al, N, and O in a predetermined relationship, with a balance being Fe and inevitable impurities, wherein &#x221a;I&#x2264;80 (where I denotes an area (&#x3bc;m) of an oxide-based inclusion located in a fish eye central portion at a fracture surface after subjecting the case hardening steel to carburizing-quenching and tempering and then performing a rotating bending fatigue test).

Case hardening steel, method of producing case hardening steel, and method of producing gear part

The present invention provides a steel for nitrocarburizing having excellent mechanical workability before nitrocarburizing, and showing excellent fatigue properties after nitrocarburizing, which is suitable for applying in mechanical structural components for automobiles etc. prepared by adjusting the composition so that it contains in mass %, C: 0.01% or more and less than 0.10%, Si: 1.0% or less, Mn: 0.5% to 3.0%, P: 0.02% or less, S: 0.06% or less, Cr: 0.3% to 3.0%, Mo: 0.005% to 0.4%, V: 0.02% to 0.5%, Nb: 0.003% to 0.15%, Al: 0.005% to 0.2%, and Sb: 0.0005% to 0.02%, and the balance including Fe and incidental impurities, and setting the area ratio of bainite phase to the whole microstructure to more than 50%.

Steel for nitrocarburizing and nitrocarburized component, and methods for producing said steel for nitrocarburizing and said nitrocarburized component

A low carbon resulfurized free cutting steel consisting of 0.04 to 0.15% of C, more than 0.10% and 0.70% or less of Si, 0.85 to 1.50% of Mn, 0.040 to 0.120% of P, 0.250% or more and less than 0.400% of S, less than 0.005% of Al, more than 0.0020% and 0.0120% or less of O, and more than 0.0070% and 0.0150% or less of N, all by mass percentage, and the balance of Fe and inevitable impurities, and satisfying a formula (1) and a formula (2), as follows:0.15%&#x2266;Si %+2&#xd7;P %&#x2212;(5&#xd7;Al %+10&#xd7;O %+3&#xd7;N %)&#x2266;0.75%&#x2003;&#x2003;(1), and([Mn %])/15&#x3c;S %&#x3c;([Mn %])/2&#x2003;&#x2003;(2).

Low carbon resulfurized free cutting steel

According to one embodiment, a high-strength stabilizer steel for vehicles having excellent corrosion resistance and low-temperature toughness, containing 0.07 to 0.20% C, more than 0.6% and 1.5% or less Si, 1 to 3% Mn, 0.1 to 1.0% Cr, 0.005 to 0.080% sAl, 0.005 to 0.060% Ti, 0.005 to 0.060% Nb, 0.070% or less Ti+Nb, 150 ppm or less N, 0.035% or less P, 0.035% or less S, 0.01 to 1.00% Cu, 0.01 to 1.00% Ni, the remainder being Fe, and unavoidable impurities, wherein a structure before molding a stabilizer is any one of a bainite, a martensite, and a mixed structure of bainite/martensite and an original austenitic crystal grain size number after a heat treatment of the stabilizer is Gh 9 or more.

High-strength stabilizer steel for vehicles having excellent corrosion resistance and low-temperature toughness, method of producing the same, and stabilizer

A steel part having a long rolling contact fatigue life and capable of further increasing the life of a bearing under severer using condition than usual conditions. The steel part includes steel having a composition containing 0.7% by mass to 1.1% by mass of C, 0.5% by mass to 2.0% by mass of Si, 0.4% by mass to 2.5% by mass of Mn, 1.6% by mass to 5.0% by mass of Cr, 0.1% by mass to less than 0.5% by mass of Mo, 0.010% by mass to 0.050% by mass of Al, less than 0.0015% by mass of Sb as an impurity, and the balance composed of Fe and inevitable impurities, the steel being hardened and tempered. In the steel structure of a portion from the surface to a depth of 5 mm, residual cementite has a grain diameter of 0.05 to 1.5 &#x3bc;m, prior austenite has a grain diameter of 30 &#x3bc;m or less, and the ratio by volume of the residual austenite is less than 25%.

Method for producing steel part having long rolling contact fatigue life

The present invention relates to a high strength hot rolled steel sheet containing 0.15% or less C, 0.02 to 0.35% Ti, and 0.05 to 0.7% Mo by weight percentage and consisting essentially of a matrix of ferrite structure single phase and fine precipitates with a grain size of smaller than 10 nm dispersed in the matrix, for example, a high strength hot rolled steel sheet which consists essentially of 0.06% or less C, 0.5% or less Si, 0.5 to 2.0% Mn, 0.06% or less P, 0.005% or less S, 0.1% or less Al, 0.006% or less N, 0.02 to 0.10% Ti, 0.05 to 0.6% Mo by weight percentage, and the balance being Fe, wherein fine precipitates with a grain size of smaller than 10 nm are dispersed in a matrix of ferrite structure single phase at a number per unit volume of 5&times;10 /&mgr;m or higher. This steel sheet, which has tensile strength of not lower than 550 MPa, high elongation and excellent stretch flangeability, is suitable for intricately shaped automotive chassis parts such as a suspension arm.

High strength hot rolled steel sheet

A steel sheet for preparing a heat shrink band effective for preventing the color drift is provided by a steel sheet having 24 kg/mm or higher of yield stress and 400 or higher of the product between the permeability &mgr; under a magnetic field of 0.3 Oe and the sheet thickness.

Steel sheet for heat shrink band effective for preventing color drift

A hot-dip galvanized steel sheet is produced by rough rolling a steel, finish rolling the rough rolled steel at a temperature of Ar3 point or more, coiling the finish rolled steel at a temperature of 700&deg; C. or less, and hot-dip galvanizing the coiled steel at a pre-plating heating temperature of Ac1 to Ac3. A continuous hot-dip galvanizing operation is performed by soaking a pickled strip at a temperature of 750 to 850&deg; C., cooling the soaked strip to a temperature range of 600&deg; C. or less at a cooling rate of 1 to 50&deg; C. per second, hot-dip galvanizing the cooled strip, and cooling the galvanized strip so that the residence time at 400 to 600&deg; C. is within 200 seconds. The steel sheet has a structure consisting essentially of ferrite and martensite.

Hot-dip galvanized steel sheet and method for producing the same

A heat shrink band steel sheet of the present invention comprises on the basis of percent in weight C: 0.1% or less, Si: 0.1% or less, Mn: 0.1 to 2%, P: 0.15% or less, S: 0.02% or less, sol Al: 0.08% or less, and N: 0.005% or less, or C: 0.005% or less, Si: 0.1% or less, Mn: 0.1 to 2%, P: 0.15% or less, S: 0.02% or less, sol Al: 0.08% or less, N: 0.005% or less, Ti: 0.02 to 0.06%, and B: 0.0003 to 0.005%, wherein the product of a magnetic permeability at the magnetic field of 0.3 Oe after heat shrinking treatment and a thickness (mm) is at least 350. A color CRT having a sufficient magnetic shielding characteristic and a less amount of color deviation can be realized by the steel sheet.

Heat shrink band steel sheet and manufacturing method thereof

A steel sheet for a heat-shrink band, which is to be thermally expanded and fitted over the outer periphery of the panel portion of a cathode ray tube, which has at least a 20% elongation at an ambient temperature and at least a 40 kg/mm.sup.2 stress of yielding point after the heating and cooling, in particular one comprised by a dual phase cold rolled steel sheet comprising a ferrite phase and a martensite phase or a cold rolled steel sheet containing a retained austenite.

Steel sheet for heat-shrink band

Method of making non-oriented electrical steel sheets

Method of making non-oriented electrical steel sheets having excellent

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Tokyo, Japan

Kunikazu Tomita