FR2310566A1 - Detecting defects or stress across cold rolled steel strip - by feeding strip over roller contg magnetic search coils - Google Patents

Detecting defects or stress across cold rolled steel strip - by feeding strip over roller contg magnetic search coils

Info

Publication number
FR2310566A1
FR2310566A1 FR7613733A FR7613733A FR2310566A1 FR 2310566 A1 FR2310566 A1 FR 2310566A1 FR 7613733 A FR7613733 A FR 7613733A FR 7613733 A FR7613733 A FR 7613733A FR 2310566 A1 FR2310566 A1 FR 2310566A1
Authority
FR
France
Prior art keywords
magnetic
sheet
contg
stress
rolled steel
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
FR7613733A
Other languages
French (fr)
Other versions
FR2310566B3 (en
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.)
British Steel Corp
Original Assignee
British 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 British Steel Corp filed Critical British Steel Corp
Publication of FR2310566A1 publication Critical patent/FR2310566A1/en
Application granted granted Critical
Publication of FR2310566B3 publication Critical patent/FR2310566B3/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

Appts. for the magnetic testing of a moving sheet, comprises a hollow roller made of a material (I) with ferromagnetic properties. Inside the roller, near to the surface on which the sheet is stretched, are control devices responding to variations in a magnetic characteristic of the sheet. Material (I) has a magnetic permeability selected so that sufficient inductive coupling occurs between the sheet and the control devices to detect the variations in the magnetic characteristic. Material (I) pref. has max. magnetic permeability 1.5 mu, and is esp. stainless steel to specification ASTM 321. The control devices pref. consist of magnet yokes with 3 legs. Used for example, after cold rolling of continuous steel strip prior to coiling, for detecting local stresses, non-magnetic inclusions or fissures or scale.
FR7613733A 1975-05-08 1976-05-07 Detecting defects or stress across cold rolled steel strip - by feeding strip over roller contg magnetic search coils Granted FR2310566A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1944775 1975-05-08

Publications (2)

Publication Number Publication Date
FR2310566A1 true FR2310566A1 (en) 1976-12-03
FR2310566B3 FR2310566B3 (en) 1979-03-16

Family

ID=10129538

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7613733A Granted FR2310566A1 (en) 1975-05-08 1976-05-07 Detecting defects or stress across cold rolled steel strip - by feeding strip over roller contg magnetic search coils

Country Status (3)

Country Link
BE (1) BE841621A (en)
DE (1) DE2620070A1 (en)
FR (1) FR2310566A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0469158A1 (en) * 1990-02-22 1992-02-05 Nkk Corporation Magnetic flaw detector for thin steel belt

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3139491A1 (en) * 1981-09-29 1983-04-07 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Eddy-current test device for detecting surface defects
US5089776A (en) * 1989-09-25 1992-02-18 Nkk Corporation Apparatus for detecting defects in a moving steel strip with a magnetizing yoke and a sensor placed on opposite sides of the strip

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0469158A1 (en) * 1990-02-22 1992-02-05 Nkk Corporation Magnetic flaw detector for thin steel belt
EP0469158A4 (en) * 1990-02-22 1992-06-24 Nkk Corporation Magnetic flaw detector for thin steel belt
US5235275A (en) * 1990-02-22 1993-08-10 Nkk Corporation Magnetic inspection apparatus for thin steel strip having magnetizer and detection coil within a hollow roller rotated by the steel strip

Also Published As

Publication number Publication date
BE841621A (en) 1976-09-01
DE2620070A1 (en) 1976-11-25
FR2310566B3 (en) 1979-03-16

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Legal Events

Date Code Title Description
ST Notification of lapse