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Metallurgical Monitoring

Software package HRRM for prediction of final mechanical properties of hot rolled products with connection to on-line process data

HHot Rolling Metallurgical Monitoring (HRMM) means the off-line prediction of final mechanical properties of hot rolled steel products based on process data receiving on-line from the Level 2 and Cooling Control System of the rolling mill.

The HRMM system consists of three basic software modules:

  • »HRMM Predictor – calculation of temperature curves not delivered by L2 or Cooling Control System and prediction of final mechanical properties of rolled product,
  • »HRMM Corrector – calculation of corrections of the HRMM Predictor based on results of quality control tests,
  • »HRMM Database – database contains records of process data created by the control system for each rolled piece necessary for the HRRM Predictor calculations.
Metallurgical Monitoring

Basic structure of the Hot Rolling Metallurgical Monitoring System

HRRM Predictor

The Metallurgical Monitoring Predictor is the crucial part of the monitoring system. It consists of the following three basic software modules:

  • »MetaROLL Module – calculation of microstructure changes occurring in deformed austenite during deformation in every pass and during inter-pass delay,
  • »TempC Module – calculation of deformed austenite transformation and final mechanical properties of steel after the final cooling,
  • »Modul TempC – vcalculation of temperature curves which were not delivered by L2 or CCS (e.g. temperatures during final cooling of strip in coil, bars on cooling bed or temperatures during subsequent heat treatment).
Metallurgical Monitoring

Basic chart of the Hot Rolling Metallurgical Monitoring Predictor

Limits of chemical composition

The HRRM software is delivered for the following steel groups and limitations of chemical composition:

  • »CARBON - low and middle alloyed carbon steels (sum of alloying additions < 10%)
  • »MICRO - microalloyed steels (C-Mn, Cr, Mo steels, Ti+Nb+B > 0)
  • »ULC - ultra low carbon steels (0.001% < C < 0.06%)
Metalurgický monitoring

Metallurgical Monitoring Implementation

Today we can offer the following two types of Metallurgical Monitoring implementation:

  • »Metallurgical Monitoring as the module of the Level2
    Metallurgical Monitoring in full automatic regime calculates on-line mechanical properties after each rolled piece. Metallurgical calculations are based on the data delivered by the Level2 and on internally calculated cooling curves if they were not delivered by the Level2. This prediction is, together with corresponding technological input parameters, saved in the Level2 database and reported in standard Level2 reports. Metallurgical Monitoring can be used in off-line regime as well when the data saved in the Level2 Database for selected coil can be recalculated anytime if necessary.
  • Metalurgický monitoring

    Temperature distribution in specified time across the coil

    Metalurgický monitoring

    CCT diagram and final cooling curve in specified point of the strip

  • »Off-line Implementation of the HRMM Predictor
    The HRMM Predictor is technology independent so it can be implemented into various off-line hot rolling simulation tools. Such off-line implementations are for example the software SPP (Strip Properties Predictor), DLPP (Danieli Long Products Properties Predictor) or QTSteel (Quenching and Tempering of Steels).

Benefits

Main benefits resulting from implementation of the Metallurgical Monitoring module are following:

  • »Sophisticated assistance in commissioning of new steel grades
    Commissioning of new steel grades using only process testing and trial-and-error method is not only time-consuming but also expensive. A very useful tool in optimizing this process is a computer simulation.
  • »Sophisticated assistance in solving quality problems of hot rolled production
    Knowledge of real process history of each product coupled with the possibility of quick computer simulation of main technological influences helps significantly in solving of metallurgical quality of hot rolled production.