Nippon Steel Sumitomo Metal Corporation

Sumitomo Metal Industries, Inc.

Nippon Telegraph and Telephone Corporation

Akihiro Yamanaka

Naoki Tajima

Kenji Taguchi

Sei Hiraki

Seiji Kumakura

Yoshitaka Nakamura

Nobuhiro Okada

Toshihiko Murakami

Kazuo Okamura

Keitaro Horikawa

Toshiya Yamada

Masato Sawada

Kouji Takatani

Hidetoshi Suwa

Nobuaki Takahashi

Kazuhiro Shimoda

Tomio Yamakawa

Shingo Tsukada

Masahiko Hamada

Toshiro Anraku

Kouji Nakaike

Masakazu Koide

Hideo Mizukami

Shuji Okaguchi

Manabu Adachi

Ryuji Itoyama

Tadao Watanabe

Yuji Nonomura

Hiroyasu Simizu

Takasi Kanazawa

Isamu Takeuchi

Sachie Suzuki

Takashi Kanazawa

Sadamichi Kaseda

Hirofumi Onishi

Ichirou Seta

Tomoaki Sera

Hideyoshi Yamaguchi

Norikazu Koga

Shinji Nagai

A wearable device attached to a subject includes an accelerometer that measures acceleration information, and a biological sensor that measures biological signal information of the subject. From the measured acceleration information and biological signal information, first feature data corresponding to a first predetermined period and second feature data corresponding to a second predetermined period are extracted. By machine learning based on the first feature data, a dynamic/static activity identification model, a dynamic-activity identification model, and a static-activity identification model, for the subject, are generated. By combination of results of determination based on each of the identification models, a posture and an activity of the subject are identified and correspondence information, which associates the identified posture and activity with the biological signal information of the subject, is generated.

Device and method for sequential posture identification and autonomic function information acquisition

A wearable device attached to a subject includes an accelerometer that measures acceleration information, and a biological sensor that measures biological signal information of the subject. From the measured acceleration information and biological signal information, first feature data corresponding to a first predetermined period and second feature data corresponding to a second predetermined period are extracted. By machine learning based on the first feature data, a dynamic/static activity identification model, a dynamic-activity identification model, and a static-activity identification model, for the subject, are generated. By combination of results of determination based on each of the identification models, a posture and an activity of the subject are identified, and correspondence information, which associates the identified posture and activity with the biological signal information of the subject, is generated.

A primary object of this invention is to provide a continuous casting method by which a slab of excellent internal quality can be obtained even if the casting speed is changed. In this invention, upon continuous casting with two pairs of the reduction rolls arranged along a casting direction and support rolls arranged between the reduction rolls, when a casting speed is reduced compared to a state where combination of reduction with reduction rolls at a first stage on an unsolidified portion of the slab and reduction with reduction rolls at a second stage on a solidified portion thereof is employed, the combination is switched to combination of reduction with the reduction rolls at the first stage on a portion of the slab at an end of solidification and the reduction with the reduction rolls at the second stage on the solidified portion thereof.

Method for continuous-casting slab

A method for manufacturing a forged steel roll comprises: casting, by the ESR method, a steel ingot which contains, by mass %, C: 0.3% or more, Si: 0.2% or more, Cr: 2.0-13.0% and Mo: 0.2% or more, and further contains Bi at 10-100 ppm by mass; and forging the steel ingot to manufacture the roll. According to this method, since freckle defects can be sealed near the center of the steel ingot, the roll can be stably used over a long period of time.

Method for manufacturing forged steel roll

A primary object of the present invention is to provide a method for continuous casting with which slabs for heavy gauge steel plate in which porosities are decreased can be manufactured. In the present invention, when a slab for heavy gauge steel plate is continuously cast, two pairs of reduction rolls that are arranged separately from each other with a roll-interval in a range from 3 m to 7 m, between which a support roll is arranged, are used, reduction is carried out on the slab by 3 to 15 mm with the reduction rolls at the first stage under the condition where the slab includes an unsolidified portion with the solid-phase ratio in a range from 0.8 to less than 1, and reduction is further carried out on the slab with the reduction rolls at the second stage under the condition where the slab is completely solidified.

Method for continuously casting slab for heavy gauge steel plate

An electromagnetic stirrer for stirring molten steel of the liquid core in a width-wise direction of the slab includes an iron core disposed with its length-wise axis along a width-wise direction of slab, and a plurality of exciting coils wound around the outer circumference of and about a length-wise axis of the iron core, wherein two-phase or three-phase alternating current is passed through the coils. The phases of the current in the exciting coils are distributed to impart a stirring flow to the molten that includes flow from the minor sides to the center of the slab or from one minor side to the other minor side with a reversing flow at predetermined time intervals.

Method for continuous casting of steel and electromagnetic stirrer to be used therefor

In a high-tensile steel plate according to the invention, the carbon equivalent Pcm represented in Expression (1) is from 0.180% to 0.220%, the surface hardness is a Vicker's hardness of 285 or less, the ratio of a Martensite Austenite constituent in the surface layer is not more than 10%, the ratio of a mixed structure of ferrite and bainite inside beyond the surface layer is not less than 90%, the ratio of the bainite in the mixed structure is not less than 10%, the thickness of the lath of bainite is not more than 1 &#x3bc;m, the length of the lath is not more than 20 &#x3bc;m, and the segregation ratio as the ratio of the Mn concentration in the center segregation part relative to the Mn concentration at a part in a depth equal to &#xbc; of the thickness of the plate from the surface is not more than 1.3. Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B . . . (1) where the element symbols in Expression (1) represent the % by mass of the respective elements. In this way, the high-tensile steel plate according to the invention has a yield strength of at least 551 MPa and a tensile strength of at least 620 MPa as well as high toughness, high propagating shear fracture and high weldability.

High-tensile steel plate, welded steel pipe or tube, and methods of manufacturing thereof

Disclosed is a continuous casting in which an electromagnetic stirrer is installed upstream, in the casting direction, of the reduction rolling position of a slab, and in which a slab with a liquid core is reduced in thickness, wherein by imparting a collision flow forming-type stirring and a uni-directional alternating flow forming-type stirring, molten steel with concentrated segregation elements is stirred and diffused in a width-wise direction of slab, whereby a slab stabilized in center segregation qualities can be produced over long-time casting operation. Since the stirring flowing pattern is selectively imparted by means of the same electromagnetic stirrer, it is effective to decrease facility and equipment costs, improve maintainability, and extensively cope with various casting conditions. The continuous casting method stably ensures excellent center segregation qualities over a long time in casting of high-strength steel with high crack susceptibility or steel grade for extremely thick plate product.

A continuous casting method is demonstrated, in which a slab including a liquid coreis bulged and then reduced in its thickness with a reduction roll pairin which case, the uppermost surface of the lower rollin the reduction roll pairis located at a higher level than the lower pass lineof the slab. With this method, the slab can be efficiently reduced in its thickness without any loss of reduction force and the generation of segregation can be suppressed at the center area of the slab in the thickness direction. A continuous casting apparatus according to the invention is suitable for carrying out the continuous casting method according to the invention. A slab produced by the method according to the invention has good quality, since the segregation at the center area can be improved over the entire width in which the liquid coreis included.

Continuous casting method, continuous casting apparatus and continuously cast steel slab

Process for continuously casting thin slabs

Method and apparatus for continuous casting of a thin slab

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Tokyo, Japan

Akihiro Yamanaka