Control of Mechanical Properties by Monitoring Microstructure

  1. Prof. Dr. P. Neumann4,
  2. Dr. D. Allen5 and
  3. Prof. Dr. E. Teuckhoff6
  1. Hans Ulrich Löffler1,
  2. Rüdiger Döll1,
  3. Bernhard Lang1,
  4. Günter Sörgel1,
  5. Udo Holtheuer2 and
  6. Gustav Zouhar3

Published Online: 5 JAN 2006

DOI: 10.1002/3527606181.ch10

Steels and Materials for Power Plants, Volume 7

Steels and Materials for Power Plants, Volume 7

How to Cite

Löffler, H. U., Döll, R., Lang, B., Sörgel, G., Holtheuer, U. and Zouhar, G. (2000) Control of Mechanical Properties by Monitoring Microstructure, in Steels and Materials for Power Plants, Volume 7 (eds P. Neumann, D. Allen and E. Teuckhoff), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606181.ch10

Editor Information

  1. 4

    Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany

  2. 5

    ABB Asltom Power UK Ltd., Cambridge Road, Whetstone, Leicester LE9 GLH, United Kingdom

  3. 6

    Siemens AG, Postfach 3240, 91050 Erlangen, Germany

Author Information

  1. 1

    Siemens AG, Germany

  2. 2

    Hoesch Hohenlimburg GmbH, Germany

  3. 3

    Technical University of Dresden, Germany

Publication History

  1. Published Online: 5 JAN 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301959

Online ISBN: 9783527606184



  • steels for power plants;
  • materials for power plant;
  • control of mechanical properties;
  • monitoring of micro structure


The microstructure monitor involves a method to compute mechanical properties of hot rolled steel from process data and the chemical composition of the steel. The underlying microstructure model monitors grain size and degree of recrystallization at each point in the mill. The physical model is complemented by an artificial neural network for the calculation of mechanical properties. The evolution of microstructure during finishing and cooling is described in the model. Processes such as static and dynamic recrystallization, grain growth and austenite-ferrite transformation are all part of the calculation.

Results from hot rolling mills are presented. A comparison of measured and calculated values for the tensile strength of low-carbon manganese and niobium microalloyed steels illustrate the accuracy of the microstructure monitor.

Several major advantages result from the on-line application of the monitor system. In addition to the facility of quick release of strips after rolling and the saving of costs involved in quality control measurements, even process parameters could be changed to achieve desired mechanical properties of the product.