EOW May 2007

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EuroWire – May 2007 17
english corporate news
Second hot-strip rolling
mill for China
Metals Technologies (MT), a division of
the Siemens Group Industrial Solutions
and Services (I&S), received another order
from Tangshan Guofeng Co Ltd, China,
to equip its second hot-strip rolling mill
at the Tangshan location with automation
technology.
This includes all basic and process
automation as well as the visualisation
system.
A new strip-cooling model, which is
also part of the scope of supply, enables
the efficient production of high-quality
steels.
Commissioning of the automation
equipment of the new rolling mill is
scheduled for January 2008 and the
first coil is to be produced at the end of
March 2008.
Tangshan Guofeng Co Ltd, located in
Hebei province around 200km to the
east of Beijing, operates a production
complex the capacity of which is to
be doubled from a current 4.4 million
metric tons of crude steel to 8.8 million
metric tons in the next few years.
A new rolling mill will be installed with
a rolling capacity of up to three million
metric tons of hot strip per year and
will be capable of rolling strip with
thicknesses up to 1,430mm.
Siemens is supplying the basic and
process automation for the reversing
roughing stand equipped with a
hydraulic edger, a coil box, the seven-
stand finishing train with work-roll
shifting and bending equipment, the
laminar-cooling section and the two
coilers, including coil conveyor.
The technological control systems and
the process models for the individual
mill sections are also included in the
scope of supply.
Integrated HMI (human machine
interface) systems with easy-to-use
process and plant diagnostic functions
will facilitate plant operation.
A central feature of the automation
solution is the new strip-cooling model
of Siemens, which is based on a physical
description of the thermodynamic
processes during cooling.
The calculation of temperature
characteristic curves and phase
components along the entire strip is
carried out in real time.
The current data is sent to a model-
predictive cooling-line control system.
As a result, precise monitoring of the
entire strip cooling procedure over time
is possible.
This not only ensures constant quality for
the whole strip, the required metallurgical
properties of the steel can also be reliably
achieved within tight tolerances. This
enables the efficient production of high-
quality steel grades.
All of the components and systems to be
used are part of the integrated Siroll HM
solution for hot-rolling mills.
The automation system is characterised
by its high degree of standardisation.
This ensures rapid production start-up
and high plant availability. Siemens is
also responsible for the installation of the
supplied systems.
The mechanical equipment and the
drives – mainly Siemens components – for
the hot-rolling mill will be provided by
domestic Chinese companies.
Siemens – Austria
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