JPS5746148A - Detecting method for flaw on hot surface of steel material - Google Patents

Detecting method for flaw on hot surface of steel material

Info

Publication number
JPS5746148A
JPS5746148A JP12212780A JP12212780A JPS5746148A JP S5746148 A JPS5746148 A JP S5746148A JP 12212780 A JP12212780 A JP 12212780A JP 12212780 A JP12212780 A JP 12212780A JP S5746148 A JPS5746148 A JP S5746148A
Authority
JP
Japan
Prior art keywords
width direction
steel material
temperature
distribution data
smooth
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
JP12212780A
Other languages
Japanese (ja)
Other versions
JPS6355658B2 (en
Inventor
Kunio Iwai
Nobuyoshi Ishikawa
Hitoshi Chiba
Toshiro Ouchi
Yoshiaki Nakamura
Yoshio Ite
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 JP12212780A priority Critical patent/JPS5746148A/en
Publication of JPS5746148A publication Critical patent/JPS5746148A/en
Publication of JPS6355658B2 publication Critical patent/JPS6355658B2/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
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE:To detect flaws on the surface of hot steel materials precisely by heating the descaled surface of hot steel materials quickly and detecting the temperature of the surface in the direction along the surface. CONSTITUTION:Since an induction heating coil 1 is arranged in the direction of the width of a steel material 2, the distance between each part in the width direction on the surface of the steel material 2 and the induction heating coil 1 varies according to the width direction and thus the value of induction current, as well as the rise in temperature of the surface, varies with each part of the surface in the width direction, and the relative level of a peak P in relation to the smooth level thereof also varies according to the width direction. Therefore, smooth temperature distribution data (wherefrom the point P is omitted) is obtained from data on measured temperature, and based on the smooth temperature distribution data and on temperature distribution data including the flaw peak P, compensation in accordance with the form of the surface is applied by means of an electric circuit or an electronic device, whereby the flaws are detected automatically.
JP12212780A 1980-09-03 1980-09-03 Detecting method for flaw on hot surface of steel material Granted JPS5746148A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12212780A JPS5746148A (en) 1980-09-03 1980-09-03 Detecting method for flaw on hot surface of steel material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12212780A JPS5746148A (en) 1980-09-03 1980-09-03 Detecting method for flaw on hot surface of steel material

Publications (2)

Publication Number Publication Date
JPS5746148A true JPS5746148A (en) 1982-03-16
JPS6355658B2 JPS6355658B2 (en) 1988-11-04

Family

ID=14828277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12212780A Granted JPS5746148A (en) 1980-09-03 1980-09-03 Detecting method for flaw on hot surface of steel material

Country Status (1)

Country Link
JP (1) JPS5746148A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58187253A (en) * 1982-04-27 1983-11-01 Nippon Steel Corp Method for detecting abnormality and evaluating surface of ingot in continuous casting
ES2108616A1 (en) * 1994-11-14 1997-12-16 Daido Steel Co Ltd Method and apparatus for detecting defects.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51147379A (en) * 1975-06-13 1976-12-17 Nippon Steel Corp Surface flaw detecting method of continuous casting materiais
JPS53126977A (en) * 1977-04-12 1978-11-06 Ishikawajima Harima Heavy Ind Crack detecting method in high temperatures

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51147379A (en) * 1975-06-13 1976-12-17 Nippon Steel Corp Surface flaw detecting method of continuous casting materiais
JPS53126977A (en) * 1977-04-12 1978-11-06 Ishikawajima Harima Heavy Ind Crack detecting method in high temperatures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58187253A (en) * 1982-04-27 1983-11-01 Nippon Steel Corp Method for detecting abnormality and evaluating surface of ingot in continuous casting
ES2108616A1 (en) * 1994-11-14 1997-12-16 Daido Steel Co Ltd Method and apparatus for detecting defects.

Also Published As

Publication number Publication date
JPS6355658B2 (en) 1988-11-04

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