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This report examines the nondestructive testing of the surface of hot CC billets which is an important method of inspection in the earliest possible stages of steel products processing. In the near surface zone billets are examined for surface defects (longitudinal and transverse cracks or punctual defects) and sub-surface defects (small bubbles and slag inclusions). The aim is an inspection where the billet is over 1000 C. For surface defects, classical eddy currents are used. Two probes are required. For sub-surface defects, 2 techniques allow the detection of holes to a 3 mm depth in a stainless steel plate simulating hot steel : low frequency eddy currents and pulsed eddy currents. Pulsed eddy currents appear to be more promising, since they allow a multiparameter analysis. An industrial prototype integrating these 3 probes has been put online in UNIMETAL Normandie, operating satisfactorily, mechanically and electronically

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Authors: MAYOS M, IRSID, Saint Germain-en-Laye (FR);TURON J M, IRSID, Saint Germain-en-Laye (FR);ALEXANDRE G, IRSID, Saint Germain-en-Laye (FR);CLAESSEN P, IRSID, Saint Germain-en-Laye (FR);VINCENT F, IRSID, Saint Germain-en-Laye (FR)
Bibliographic Reference: EUR 15583 FR (1996) 59pp., FS, ECU 10.00
Availability: Available from the (2)
ISBN: ISBN 92-827-5556-8
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