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公开(公告)号：DE69938407T2
公开(公告)日：2009-04-23
申请号：DE69938407
申请日：1999-08-11
Applicant: JFE STEEL CORP
Inventor： HASHIMOTO TATSUYA , IIZUKA YUKINORI , MATSUFUJI YASUHIRO , SHIMIZU TAKEO
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公开(公告)号：DE60132389T2
公开(公告)日：2009-02-19
申请号：DE60132389
申请日：2001-11-29
Applicant: JFE STEEL CORP
Inventor： IIZUKA YUKINORI , AWAJIYA YUTAKA , NAKADA MASAYUKI , SUZUKI MAKOTO , TSUTSUMI KOICHI
Abstract: A manufacturing method for a continuously cast product of steel comprising the steps of: detecting a position of crater end of product by using a method for measuring a solidification state of continuously cast product by a sensor arranged so as to be in non-contact with said product; and controlling at least one condition selected from the conditions of the casting speed and the quantity of secondary cooling water based on said detected position of crater end, said method for measuring a solidification state of continuously cast product comprising the steps of: transmitting transverse waves of burst-like electromagnetic ultrasonic waves, in which at least one selected from frequency, amplitude, and phase is modulated within a pulse width that has a magnitude of 50 to 150 % of the maximum time width not exceeding a time of flight for propagating in said product, to said product as a transmitting signal; receiving a signal after said transmitting signal propagates in said product as a receiving signal; and judging the solidification state of said product by performing correlation operation of said receiving signal by using a reference signal of a waveform that is the same as or similar to said transmitting signal.
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公开(公告)号：AT383215T
公开(公告)日：2008-01-15
申请号：AT06001406
申请日：2001-11-29
Applicant: JFE STEEL CORP
Inventor： IIZUKA YUKINORI , AWAJIYA YUTAKA , NAKADA MASAYUKI , SUZUKI MAKOTO , TSUTSUMI KOICHI
Abstract: A manufacturing method for a continuously cast product of steel comprising the steps of: detecting a position of crater end of product by using a method for measuring a solidification state of continuously cast product by a sensor arranged so as to be in non-contact with said product; and controlling at least one condition selected from the conditions of the casting speed and the quantity of secondary cooling water based on said detected position of crater end, said method for measuring a solidification state of continuously cast product comprising the steps of: transmitting transverse waves of burst-like electromagnetic ultrasonic waves, in which at least one selected from frequency, amplitude, and phase is modulated within a pulse width that has a magnitude of 50 to 150 % of the maximum time width not exceeding a time of flight for propagating in said product, to said product as a transmitting signal; receiving a signal after said transmitting signal propagates in said product as a receiving signal; and judging the solidification state of said product by performing correlation operation of said receiving signal by using a reference signal of a waveform that is the same as or similar to said transmitting signal.
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公开(公告)号：CA3013438C
公开(公告)日：2020-07-14
申请号：CA3013438
申请日：2014-12-24
Applicant: JFE STEEL CORP
Inventor： ONO HIROAKI , KODAMA TOSHIFUMI , KOSHIHARA TAKAHIRO , OGAWA AKIHIRO , IIZUKA YUKINORI
Abstract: A surface defect detecting method is a surface defect detecting method of optically detecting a surface defect of a steel pipe P, and includes an irradiation step of irradiating the same examination target part with illumination light beams L from different directions by using two distinguishable light sources 2a and 2b, and a detection step of obtaining images by reflected light beams of the respective illumination light beams L and detecting a surface defect in the examination target part by executing subtraction processing between the obtained images. Thereby, the surface defect is able to be accurately distinguished from scale or a harmless pattern.
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公开(公告)号：CA2679123C
公开(公告)日：2015-11-24
申请号：CA2679123
申请日：2007-05-18
Applicant: JFE STEEL CORP
Inventor： IIZUKA YUKINORI , KENMOCHI KAZUHITO , YOKOYAMA HIROYASU , INOUE TOMOHIRO , SAKASHITA SHIGETO
Abstract: Ultrasonic flaw detection at the welded portion (2) of a tubular body (1) is performed at least in the axial direction of the tubular body, a defect judgment threshold is determined based on the difference of signal strength between the total area of defects existing in the region of an ultrasonic beam on the welded surface and an artificial defect, and then quality control of the tubular body is performed by the defect judgment threshold. From the defect density on the welded surface at the welded portion in the axial direction of tubular body determined from a desired quality level and the area of the ultrasonic beam on the welded surface, an equivalent defect diameter is determined based on the total area of defects existing in the region of the ultrasonic beam and then the defect judgment threshold is determined based on the difference of signal strength between the equivalent defect diameter and the artificial defect.
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Patent Agency Ranking
公开(公告)号：CA2677770C
公开(公告)日：2015-04-07
申请号：CA2677770
申请日：2008-02-08
Applicant: JFE STEEL CORP
Inventor： INOUE TOMOHIRO , SAKASHITA SHIGETO , YUASA DAIJIRO , YOKOYAMA HIROYASU , KENMOCHI KAZUHITO , IIZUKA YUKINORI
Abstract: A method for manufacturing an electric resistance steel pipe having a good toughness at a welded portion is provided, the method being capable of stably manufacturing an electric resistance welded steel pipe having a desirable toughness at a welded portion although a steel strip serving as a base material has a dimensional variation. Groove shapes 5a and 5b are applied to edges 4a and 4b of an open pipe 4, an edge shape monitor 11 continuously captures images of the edges 4a and 4b immediately before electric resistance welding, and the captured images are input to an arithmetic processing unit 14 for image processing. Thus, a groove height h is measured, an optimum welding electric power is calculated on the basis of the measurement result, and the welding electric power from electric power generating equipment 6 is adjusted. Furthermore, an ultrasonic flaw detector 15 continuously measures an oxide distribution at the welded portion after the electric resistance welding. The optimum welding electric power is calculated on the basis of the measurement result, and the welding electric power from the welding power generating equipment 6 is adjusted.
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公开(公告)号：CA2679293C
公开(公告)日：2013-12-10
申请号：CA2679293
申请日：2007-05-18
Applicant: JFE STEEL CORP
Inventor： IIZUKA YUKINORI , KENMOCHI KAZUHITO , YOKOYAMA HIROYASU , INOUE TOMOHIRO , SAKASHITA SHIGETO
Abstract: The present invention has a structure capable of detecting the scattered-type penetrator having oxides each with the size of several m sparsely and widely dispersed. Specifically, the structure includes a wave transmission unit 6 for transmitting an ultrasonic wave to the welded surface of the welded portion 2 in a pipe axial direction of the pipe 1 such that the beam width of a transmission beam 8 is brought into a range from 0.5 mm to 2.5 mm, and a wave reception unit 7 for receiving at least a portion of the reflection wave (reception beam 9) at the welded surface. The wave transmission unit 6 and the wave reception unit 7 include transmission/reception units formed of different groups of transducer elements on at least one or more array probes 5 arranged in the circumferential direction of the pipe.
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公开(公告)号：CA2679060C
公开(公告)日：2013-09-24
申请号：CA2679060
申请日：2007-05-18
Applicant: JFE STEEL CORP
Inventor： YOKOYAMA HIROYASU , KENMOCHI KAZUHITO , OKABE TAKATOSHI , IIZUKA YUKINORI
Abstract: An electric resistance welded steel pipe for line pipe excelling in weld part toughness, exhibiting an area fraction of microdefects of less than 50 µm maximum length in a projection plane of electric resistance weld part ranging from 0.000006 to 0.035 and exhibiting an absorbed energy at -40°C, as measured by a metal material impact testing method, of 100 J or greater.
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公开(公告)号：CA2679123A1
公开(公告)日：2008-09-04
申请号：CA2679123
申请日：2007-05-18
Applicant: JFE STEEL CORP
Inventor： YOKOYAMA HIROYASU , INOUE TOMOHIRO , IIZUKA YUKINORI , KENMOCHI KAZUHITO , SAKASHITA SHIGETO
Abstract: Ultrasonic flaw detection at the welded portion (2) of a tubular body (1) is performed at least in the axial direction of the tubular body, a defect judgment threshold is determined based on the difference of signal strength between the total area of defects existing in the region of an ultrasonic be am on the welded surface and an artificial defect, and then quality control of the tubular body is performed by the defect judgment threshold. From the defect density on the welded surface at the welded portion in the axial dire ction of tubular body determined from a desired quality level and the area o f the ultrasonic beam on the welded surface, an equivalent defect diameter i s determined based on the total area of defects existing in the region of th e ultrasonic beam and then the defect judgment threshold is determined based on the difference of signal strength between the equivalent defect diameter and the artificial defect.
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公开(公告)号：CA2677770A1
公开(公告)日：2008-08-21
申请号：CA2677770
申请日：2008-02-08
Applicant: JFE STEEL CORP
Inventor： IIZUKA YUKINORI , YOKOYAMA HIROYASU , YUASA DAIJIRO , SAKASHITA SHIGETO , KENMOCHI KAZUHITO , INOUE TOMOHIRO
Abstract: A method for stably manufacturing a seam-welded steel pipe whose welded p ortion has a desired good tenacity even if the dimensions of the steel band used as a base metal vary. Groove shapes (5a, 5b) are given to the edges (4a , 4b) of an open pipe (4). The edges (4a, 4b) are continuously imaged by an edge shape monitor (11) immediately before seam welding. The captured image is inputted into a computing device (14) and subjected to image processing. Thus, the groove depth h is measured. According to the determination result, an optimum welding power is computed, and the welding power from a welding power generating device (6) is adjusted. Further, after seam-welding, the di stribution of oxides in the welded portion is continuously measured by means of an ultrasonic flaw detector (15). According to these measurement results , an optimum welding power is computed, and the welding power from the weldi ng power generating device (6) can be adjusted.
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