JPS57106855A - Ultrasonic detection of flaw in ingot during continuous casting - Google Patents

Ultrasonic detection of flaw in ingot during continuous casting

Info

Publication number
JPS57106855A
JPS57106855A JP55183415A JP18341580A JPS57106855A JP S57106855 A JPS57106855 A JP S57106855A JP 55183415 A JP55183415 A JP 55183415A JP 18341580 A JP18341580 A JP 18341580A JP S57106855 A JPS57106855 A JP S57106855A
Authority
JP
Japan
Prior art keywords
ingot
flaw
ultrasonic wave
cast iron
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP55183415A
Other languages
Japanese (ja)
Other versions
JPS649582B2 (en
Inventor
Hiroyuki Kimura
Shoji Murase
Akihiko Kusano
Tomoharu Shimokasa
Makoto Murata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP55183415A priority Critical patent/JPS57106855A/en
Publication of JPS57106855A publication Critical patent/JPS57106855A/en
Publication of JPS649582B2 publication Critical patent/JPS649582B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/11—Analysing solids by measuring attenuation of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects

Landscapes

  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE:To detect inner cracks by an on-line system, by catching a returning signal of reflective ultrasonic wave after projecting an ultrasonic wave on an ingot. CONSTITUTION:When the inner nonflat-flaw in an ingot of cast iron, in the operation of contineous casting for molten steel, is detected by using a ultrasonic wave flaw detecter, the ultrasonic wave with frequency 0.5-0.2MHz is projected to the ingot of cast iron, and then the component value equivalent to the inner nonflat-flaw existing at the inside of the ingot is extracted from the detected value. (T indicates a transmitting signal, R is receiving signal, F1 is reflection from flat flaw and B1 is returning and damping signal value from rear face of the ingot. The most suitable frequency for the ingot of cast iron necessary to detect each flaw is in the area of 0.5-2.0MH2 under the use of an on-line system for the ingot, in consideration of S/N being high and the small area of damping constant.
JP55183415A 1980-12-24 1980-12-24 Ultrasonic detection of flaw in ingot during continuous casting Granted JPS57106855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55183415A JPS57106855A (en) 1980-12-24 1980-12-24 Ultrasonic detection of flaw in ingot during continuous casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55183415A JPS57106855A (en) 1980-12-24 1980-12-24 Ultrasonic detection of flaw in ingot during continuous casting

Publications (2)

Publication Number Publication Date
JPS57106855A true JPS57106855A (en) 1982-07-02
JPS649582B2 JPS649582B2 (en) 1989-02-17

Family

ID=16135373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55183415A Granted JPS57106855A (en) 1980-12-24 1980-12-24 Ultrasonic detection of flaw in ingot during continuous casting

Country Status (1)

Country Link
JP (1) JPS57106855A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6896035B2 (en) * 2001-04-25 2005-05-24 Nkk Corporation Manufacturing method for continuously cast product of steel
EP1980345A1 (en) * 2006-02-22 2008-10-15 JFE Steel Corporation Production method for steel continuously cast piece and system for caring surface defect of cast piece
DE102013223083A1 (en) 2013-11-13 2015-05-13 Sms Siemag Ag Method and device for contactless checking of the condition of a metallurgical cast product
CN105264368A (en) * 2012-12-27 2016-01-20 Sms集团有限公司 Continuous casting device with detecting device for detecting surface defects in cast metallurgical products, and method
CN109254081A (en) * 2018-10-24 2019-01-22 贵州省分析测试研究院 The method and apparatus for measuring graphite attribute inside gray cast iron

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5470882A (en) * 1977-11-16 1979-06-07 Sumitomo Electric Ind Ltd Detection of internal flaw in continuous casting material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5470882A (en) * 1977-11-16 1979-06-07 Sumitomo Electric Ind Ltd Detection of internal flaw in continuous casting material

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6896035B2 (en) * 2001-04-25 2005-05-24 Nkk Corporation Manufacturing method for continuously cast product of steel
US7156148B2 (en) 2001-04-25 2007-01-02 Nkk Corporation Manufacturing method for continuously cast product of steel
US7448430B2 (en) 2001-04-25 2008-11-11 Nkk Corporation Manufacturing method for continuously cast product of steel
EP1980345A1 (en) * 2006-02-22 2008-10-15 JFE Steel Corporation Production method for steel continuously cast piece and system for caring surface defect of cast piece
EP1980345A4 (en) * 2006-02-22 2012-05-23 Jfe Steel Corp Production method for steel continuously cast piece and system for caring surface defect of cast piece
CN105264368A (en) * 2012-12-27 2016-01-20 Sms集团有限公司 Continuous casting device with detecting device for detecting surface defects in cast metallurgical products, and method
DE102013223083A1 (en) 2013-11-13 2015-05-13 Sms Siemag Ag Method and device for contactless checking of the condition of a metallurgical cast product
WO2015071018A1 (en) 2013-11-13 2015-05-21 Sms Siemag Ag Method and device for contactless testing of the quality of a metallurgical casting product
CN109254081A (en) * 2018-10-24 2019-01-22 贵州省分析测试研究院 The method and apparatus for measuring graphite attribute inside gray cast iron

Also Published As

Publication number Publication date
JPS649582B2 (en) 1989-02-17

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