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The standard clean steel assessment has been improved by the counting of argon bubbles. The counting of large clusters has been improved. The draw-back of the method is that large bubbles and large single inclusions cannot be reliably detected. It was therefore concluded that the method is best fit for process control rather than quality control. In 3 mm thick slab samples microfocus radiography is only capable of detecting argon bubbles. Clusters cannot be detected. Neutron radiography is capable of inspecting large volumes of steel. When this method is applied to slab samples no clusters are indicated, only large argon bubbles are detected. With ultra sound the inclusion band in slabs is found in non-rolled samples with a thickness of approximately 5 mm. However it is not possible to relate the indications to the number of clusters or argon bubbles as counted with the standard method in neighbour samples. The magnetic particle method cannot be used on rolled and non-rolled slab samples of approximately 5 mm thickness. Inspection of hot rolled coils with the magnetic particle method gives conflicting results. The Magnaflux is suitable for the characterization of cold rolled sheet. The magnetic sensor gives inferior results compared to the Magnaflux.

Additional information

Authors: ABBEL G, Koninklijke Hoogovens NV, IJmuiden (NL)
Bibliographic Reference: EUR 17993 EN (1998) 64pp., ECU 11.50
Availability: Available from the (2)
ISBN: ISBN 92-828-4136-7
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