Magnetic leakage flux flow detection method and mfg. method of hot rolled steel plate using same

A technology of hot-rolled steel plate and flaw detection method, which is applied in the direction of material magnetic variable, electromagnetic measuring device, electric/magnetic roughness/irregularity measurement, etc., and can solve problems such as difficulty in accurately detecting defects, magnetic flux disorder, and leakage
CN1373852AInactive Publication Date: 2002-10-09JFE STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JFE STEEL CORP
Publication Date
2002-10-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to the invention of the magnetic flux leakage flaw detection method. The strong magnets such as steel plates are magnetized in multiple magnetic fields of different strengths, and the magnetic probes are used to detect the magnetic flux leakage of the magnetized strong magnets, or the strong magnets are magnetized in a certain magnetic field. A plurality of magnetic probes arranged at different positions along the magnetization direction are used to detect the magnetic flux leakage of the magnetized strong magnet, and the output signal of the magnetic probe after the detected magnetic flux leakage is subjected to the calculation of highlighting the signal generated by the internal defect of the strong magnet. In addition, the magnetic flux leakage flaw detection method can be used to detect defects with high precision, so the hot-rolled steel sheet after hot rolling is inspected by this method, and the detected defect is calibrated on the position of the defective steel sheet, so that the correct defect can be grasped in advance. Scaled or descaled hot-rolled steel sheet with location information.
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Description

technical field

[0001] The present invention relates to a magnetic flux leakage flaw detection method that applies a magnetic field to a strong magnet, detects the magnetic flux leakage from the strong magnet, and checks its internal inclusions, and uses it to produce hot-rolled steel sheets and descaled steel sheets. Background technique

[0002] As a method of detecting defects such as inclusions inside a strong magnet such as a steel plate, a magnetic flux leakage flaw detection method is widely used.

[0003] As an example, figure 1 Shows the structure of a magnetic flaw detection device using a magnetic probe incorporated in a steel plate inspection line. A magnetic flaw detection device 4 is installed on the product inspection line along the transfer route of the transferred steel plate 1 (strong magnet) using the transfer rollers 2 and 3 at a substantially constant speed V. This magnetic flaw detection device 4 is composed of a magnetizer 5 that magnetizes the steel...

Claims

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