Jfe Steel Corporation

Sugatsune Kogyo Co., Ltd.

Kazuma Mori

Reiko Sugihara

Yoshimasa Funakawa

Yoshihiko Ono

Nobusuke Kariya

Kenji Kawamura

Tadashi Iijima

Shinjiro Kaneko

Hidekazu Minami

Kazunori Tahara

Takuma Komoto

A hinge devicecomprises a damper hingeand a gravity hinge. The gravity hingecomprises a rotational force imparting mechanismfor converting gravity of the doorto rotational force to a closing direction when the doorrotates to the closing direction. The damper hingecomprises a damper mechanismfor reducing the rotational force to the closing direction of the door. The damper mechanismincludes a linear damperdisposed to the first hinge memberand a first cam memberand includes a second cam memberdisposed to the second hinge member. The linear damperis positioned far from the shaft memberin an orthogonal direction to a shaft line of the shaft memberand is positioned along the shaft member. When the doorrotates to the closing direction and goes down, the linear damperis shortened along with a cam action of the first cam memberand the second cam member

Hinge device

Provided is a sliding door device which can move a support shaft attached to a sliding door along an inclined portion of a rail by using a pull-in device. The rail () is provided with the straight portion () for linearly guiding the support shaft attached to the sliding door () and the inclined portion () which is inclined with respect to the straight portion () and obliquely guides the support shaft. The straight portion () of the rail () is provided with the pull-in device () which can capture a trigger () provided on the straight portion () of the rail () and linearly move along the straight portion () of the rail () when the sliding door () is closed. A pull-in force transmission part () for moving the support shaft along the inclined portion () of the rail () is coupled to the pull-in device ().

Sliding door device

A high-strength steel sheet having a TS of 780 MPa or more, excellent stretch flangeability, and excellent in-plane anisotropy of TS is provided. A high-strength steel sheet comprises: a predetermined chemical composition; a steel microstructure including, in area fraction, ferrite: 20% or more and 50% or less, lower bainite: 5% or more and 40% or less, martensite: 1% or more and 20% or less, and tempered martensite: 20% or less, and including, in volume fraction, retained austenite: 5% or more, the retained austenite having an average grain size of 2 &#x3bc;m or less; and a texture having an inverse intensity ratio of &#x3b3;-fiber to &#x3b1;-fiber of 3.0 or less.

High-strength steel sheet and production method therefor

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 30% or more of a ferrite phase, 40% to 65% of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 &#x3bc;m from the surface in the thickness direction, the area ratio of a ferrite phase is 40% to 55% and the total area ratio of a bainite phase having a grain diameter of more than 5 &#x3bc;m and/or a martensite phase having a grain diameter of more than 5 &#x3bc;m is 20% or less, and a tensile strength is 980 MPa or more.

High-strength steel sheet and method for manufacturing the same

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 &#x3bc;m from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 MPa or more.

A high-strength, cold-rolled steel sheet having a tensile strength of 980 MPa or more, the steel sheet having a chemical composition containing, by mass %, C: 0.070% to 0.100%, Si: 0.50% to 0.70%, Mn: 2.40% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N: 0.0050% or less, Nb: 0.010% to 0.060%, Ti: 0.010% to 0.030%, B: 0.0005% to 0.0030%, Sb: 0.005% to 0.015%, Ca: 0.0015% or less, Cr: 0.01% to 2.00%, Mo: 0.01% to 1.00%, Ni: 0.01% to 5.00%, Cu: 0.01% to 5.00%, and the balance being Fe and inevitable impurities, a metallurgical microstructure including a ferrite phase in an amount of 30% or more in terms of area fraction, at least one selected from a bainite phase and a martensite phase in an amount of 40% to 65% in total in terms of area fraction, and a cementite in an amount of 5% or less in terms of area fraction at a position located at &#xbc; of the thickness from the surface of the steel sheet, and a metallurgical microstructure including a ferrite phase in an amount of 40% to 55% in terms of area fraction at a position located at 50 &#x3bc;m in the thickness direction from the surface of the steel sheet and a method for manufacturing the steel sheet.

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Chiba, Japan

Kazuma Mori