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Warmflachwalzwerke
Hot Rolling Mills Division
Modern Plate Levellers
(Abstract of the presentation at the AISE Conference 1997)
Modern Plate Levellers
(Abstract of the presentation at the AISE Conference 1997)
Gerhard Horn, Manfred Dingenotto
Mannesmann Demag Metallurgy - Casting and Hot Rolling, Duisburg/Germany
1. General Aspects
High requirements for plate quality have led to new developments in the design and
operation of levellers which have to ensure a broad levelling range, high plate flatness
and minimum internal residual stresses. The leveller concepts have been influenced by
new market requirements, such as
thermomechanically rolled and/or intensively cooled high strength steels with low
levelling temperatures,
high strength steel qualities produced, for example, by quenching and tempering or
wedge plates with variable thickness over the length.
The demands of the plate-processing industry on the dimensional and shape accuracy of
rolled plates are constantly increasing.
Among other things, customers require the plate to be straight and flat as well as free
from any internal stresses which might prejudice the application.
Internal stresses as well as waves and unevenness are attributable to:
Heterogeneous plastic deformations through the cross section such as can be found in
rolling,
Irregular cooling of rolled material through the cross section following temperature
controlled or t
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