Mathematical models and specific applications
EAF Thermal model
This model estimates the temperature of the steel in the final phase of the EAF process.
The operator takes a sample temperature, which is used as the starting point,
then the model uses the values of energy, mass, o2, exhaustion gases to estimate the time when the steel will reach
a setpoint temperature and the operator must take the final sample before tapping.
For the EAFs that use DRI, the model can be adapted to control the flow of DRI in order to sustain a determined specific heat
throughout the melting phase.
Installed in: Sidor Venezuela.
LMF Thermal model
Starting from the first temperature sample,
the model calculates the current temperature of the steel in the ladle taking into account electric energy, exhaust gases, ladle condition,
additions (especially aluminum) and stirring.
The parameters of each of these components are adaptive
using the subsequent temperature samples to correct the parameters and improve the precision.
Installed in: Siderar Argentina, Sidor Venezuela
Secondary Metallurgy and Caster synchronization model
This calculation takes into account the size and speed of the strands on the caster,
the remaining steel in the casting ladle and tundish and desired superheat temperature for the next heat.
With all these inputs, it calculates a proper temperature and time for the next ladle to be in the turret,
information that is needed by the LMF/VTD operator.
Installed in : Siderar Argentina , Sidor Venezuela
BOF Level 2
The BOF Level 2 comprises a heat management subsystem, combined blow (top/bottom) patterns and a pre-existing static model that was updated to
be installed in new servers.
The static model managed the scrap / hot metal mix, O2 Volume to blow and target C, Temperature and tapping time.
Installed in : Siderar Argentina
Material Additions Model
Based on an initial chemistry and a set of alloys materials,
the model calculates the amount of each alloy to add in order to make the proper grade chemistry while minimizing the alloys costs.
Has many adjustment options such as grade/practice allowed alloys, minimum alloy weight, etc.
Can be used as an offline model to pre-calculate grade costs based on typical initial samples.
Installed in : Siderar Argentina , Sidor Venezuela, AK Steel Ashland.
Caster Tracking Model / Cut Optimization
This model acquires several signals such as mold level fluctuations,
water flows and temperatures, mold temperatures, width changes, heat changes etc.
from the PLCs and has predetermined conditions that mark slabs/billets with events as they are being casted.
The model assigns the defects or events to metallurgical lengths and when the products are cut in the torches,
the events are assigned to the proper products,
determine what slabs/billets belong to which heats and can suggest changing cut lengths
to minimize the amount of scrap steel due to grade intermix and/or tundish changes.
Installed in : Siderar Argentina , Sidor Venezuela.
RH Degasser model
Calculates the chemistry and temperature of the steel being treated,
especially useful to estimate the degassing time to reach certain level of Carbon.
The value can be correlated by the CO / CO2 measurement if the plant has an exhaust gas analyzer.
Installed in : AK Steel Ashland.