Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Tokyo Electric Power Company Holdings, Inc.

Hitoshi Furuya

Yasunori Takahashi

Naoki Saitoh

Motohiro Okushima

Kentaro Watanabe

Keisuke Mori

Ryuji Uemori

Kouichi Onodera

Yoshiaki Suematsu

Hideo Mizuochi

Shuuji Ueno

Fumio Ishige

Takehiro Inoue

Katumi Yamada

Masayuki Ichida

Masakazu Asaba

Kenjiro Kase

Keijiro Shibui

Naohiro Minamide

Takumi Miyake

Norimasa Kawabata

Fumitoshi Takamine

A nickel-containing steel plate according to an aspect of the present invention has a chemical composition within a predetermined range, in which an average coarse grain size of prior austenite which is defined as a simple average value of maximum values of equivalent circle diameters of prior austenite grains in each of ten visual fields having an area of 200 &#x3bc;m, measured at a &#xbc;t position of the steel plate in a section formed by a rolling direction of the steel plate and a thickness direction of the steel plate is 20 &#x3bc;m or less, and a tensile strength is 690 MPa to 900 MPa.

Nickel-containing steel plate

An information processing system includes a specifying unit specifying an electric facility to be an inspection target based on: information indicating positions of a plurality of electric facilities included in a line map including information indicating the positions of the plurality of electric facilities and information indicating a connection route between the electric facilities; and information indicating a position of an information processing terminal. The system further includes a display controller to: control the information processing terminal to display information indicating that the electric facility is finished with inspection on the line map based on information indicating an inspection result of the electric facility to be the inspection target specified by the specifying unit; and change a display state of the connection route displayed on the information processing terminal in the case where an adjacent electric facility connected to the electric facility by the connection route is finished with inspection.

Information processing system, information processing method, and storage medium

A Ni-added steel plate includes, by mass %, C: 0.04% to 0.10%, Si: 0.02% to 0.12%, Mn: 0.3% to 1.0%, Ni: more than 7.5% to 10.0%, Al: 0.01% to 0.08%, T.O: 0.0001% to 0.0030%, P: limited to 0.0100% or less, S: limited to 0.0035% or less, N: limited to 0.0070% or less, and the balance consisting of Fe and unavoidable impurities, in which a Ni segregation ratio at an area of &#xbc; of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of austenite after a deep cooling is 0.5% or more, an austenite unevenness index after the deep cooling is 3.0 or less, and an average equivalent circle diameter of the austenite after the deep cooling is 1 &#x3bc;m or less.

Ni-added steel plate and method of manufacturing the same

A Ni-added steel plate contains, by mass %, C: 0.03% to 0.10%, Si: 0.02% to 0.40%, Mn: 0.3% to 1.2%, Ni: 5.0% to 7.5%, Cr: 0.4% to 1.5%, Mo: 0.02% to 0.4%, Al: 0.01% to 0.08%, T.O: 0.0001% to 0.0050%, P: limited to 0.0100% or less, S: limited to 0.0035% or less, and N: limited to 0.0070% or less with a remainder composed of Fe and inevitable impurities, in which a Ni segregation ratio at a position of &#xbc; of a plate thickness away from a plate surface in a thickness direction is 1.3 or less, a fraction of austenite after deep cooling is 2% or more, an austenite unevenness index after deep cooling is 5.0 or less, and an average equivalent circle diameter of austenite after deep cooling is 1 &#x3bc;m or less.

The present invention provides a steel plate that exhibits excellent low-temperature toughness in a base material and a weld heat-affected zone and has small strength anisotropy, wherein the steel includes, by mass, C: 0.04%-0.10%; Si: 0.02%-0.40%; Mn: 0.5%-1.0%; P: 0.0010%-0.0100%; S: 0.0001%-0.0050%; Ni: 2.0%-4.5%; Cr: 0.1%-1.0%; Mo: 0.1%-0.6%; V: 0.005%-0.1%; Al: 0.01%-0.08%; and N: 0.0001%-0.0070%, with the balance including Fe and inevitable impurities, a Ni segregation ratio at a portion located at one-fourth of a thickness of the steel plate in a steel-plate thickness direction from a surface of the steel plate is 1.3 or lower, a degree of flatness of a prior austenite grain is in a range from 1.05 to 3.0, an effective diameter of crystal grain is 10 &#x3bc;m or lower, and a Vickers hardness number is in a range of 265 HV to 310 HV.

Steel plate that exhibits excellent low-temperature toughness in a base material and weld heat-affected zone and has small strength anisotropy, and manufacturing method thereof

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Tokyo, Japan

Hitoshi Furuya