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Control and Measuring Devices
ArticleName Evaluation of material properties of flat rolled products improves process control
ArticleAuthor M. Stolzenberg, F. van den Berg, W. Dürr, U. Hoffmann, G. Moninger.

Salzgitter Mannesmann Forschung GmbH (Salzgitter, Germany):

Stolzenberg M., Dr. Nat., Expert in Non-Destructive Testing


Tata Steel Research Development and Technolohy (Ijmuiden, Netherlands):

van den Berg F., Dr., Principal Scientist


Thyssen Krupp Steel Europe AG (Duisburg, Germany):

Dürr W., Dr. Nat., Team coordinator, Testing Equipment, Research and Development


AG der Dillinger Hüttenwerke (Dillingen, Germany):

Hoffmann U., Mag. Eng., Head of Sales Dept. and Non-Destructive Testing


Steel Institute VDEh (Düsseldorf, Germany):

Moninger G., Mag. Eng., Head of Specialized Committee of Non-Destructive Testing and Measuring Devices, gü


Exact holding of the technological process in production of steel strip and sheets is considered as decisive factor for manufacturing high-quality products with the same properties along the length. To confirm it, it is necessary to determine different material parameters along its length, not only points in the end parts of a strip. Therefore, contact-free methods of non-destructive testing that can be incorporated in production lines should be applied. For this purpose, the work group of the Specialized Committee for Non-Destructive Testing and Measuring Devices of the Steel Institute of the German Union of Metallurgists (VDEh) has conducted investigations of the most important methods described in this paper. Used methods of non-destructive control are examined, among them ultrasonic control and electromagnetic processes. Different systems for estimation of material properties, such as Impoc process, Hacom measuring system, MFIA system and 3MA system, are analyzed. For each of them measuring and operating principles, data evaluation, state and task of equipment, improvement potential as well as area of usage of the results are presented in details. It is shown that laser and ultrasonic methods make it possible and acceptable to conduct measurements in high-temperature area above Curie point. It is connected with definite advantages in the cases when structural properties should be determined as soon as possible during technological process. Therefore, consequent improvement of ultrasonic devices can be an essential step in the direction of further development of the methods for on-line estimation of material properties and improvement of product quality.

keywords Non-destructive testing, sheet metal, strip, ultrasionic testing, electromagnetic methods, material properties, high-temperature area, Steel Institute

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3. Kebe, T. et al.: Einsatz des Impoc-Verfahrens zur Bestimmung mechanischtechnologischer Eigenschaften von Stahlband, DGZfP-Jahres tagung, Bremen, Juni 2011.

4. Kroos, J.; Stolzenberg, M.; Evertz, T.; Westkäm per, G.; Angerer, G.; Reimche, W.; Heutling, B.; Krys, A.; Grube, L.; Stock, M.; Borsutzki, M.; Wolter, B.; Kern, R.; Kopp, H.; Meilland, P.: Combined measuring system for an improved non-destructive determination of the mechanical/technological materials properties of steel sheet, EU-Berichte, Bd. EUR 21339, 2005, Luxembourg, Office f. Official Publ. of the EC, ISBN 92-894-9631-2.

5. Yin, W.; Peyton, A. J.; Strangwood, M.; Davis, C. L.:  Exploring the relationship between ferrite fraction and morphology and the electromagnetic properties of steel, J Mat Sc. 42 (2007) Nr. 16, S. 6 854/61.

6. Hao, X. J.; Yin, W.; Strangwood, M.; Peyton, A. J.; Morris, P. F.; Davis, C. L.: Modelling the electromagnetic response of two-phase steel microstructures, NDT&E Intern. 43 (2010) Nr. 4, S. 305/15.

7. Anm.: Einsatzort: IJmuiden, Niederlande.

8. Hofmann, U.; Dobmann, G.; Wolter, B.; Kern, R.; Schneider, E.; Meil land, P.; Buchholtz, O.-W.; Malingraux, M.; Gutteck, U.: Non-destructive evaluation (NDE) of quality characteristics of heavy plates, RFCS re port EUR 21436 EN, Luxemburg, Luxemburg, 2005.

9. VDI/VDE-Richtlinie 2616, Blatt 1, 07.2012.

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