ArcelorMittal April 2008 ArcelorMittal, The Global Champion of Steel


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ArcelorMittal

  • April 2008


ArcelorMittal, The Global Champion of Steel

  • ArcelorMittal is the world’s number one steel company with 330 000 employees

  • Representing 10% of the world steel production

  • Present in more then 60 countries

  • Leader in all major global markets including automotive, construction, household appliances and packaging

  • Leader in technologically advanced products

  • Benefiting from sizeable supplies of raw material and unrivalled distribution network



Leading position in the most attractive markets



Global assets overview



ArcelorMittal Global Research and Development Maizières Process



ArcelorMittal Maizières

  • 3 Research Centers (since June 2005)

  • 550 people (250 research engineers)

  • 40,000 m² of laboratories and pilot plant on a 240,000m² site

  • budget: ~65 M€



ArcelorMittal Maizières 4 Research Centres Devoted to Markets & Industrial Operations



Industrial Operations R&D Centre

  • Activities

  • Contribution to cost reduction by improved control of processes (productivity, flexibility, reliability)

  • Design and evaluation of sustainable process technologies, especially to drastically reduce CO2 emissions

  • Evaluation of raw materials quality (coals, scraps, ores,…) for increased flexibility and cost performance

  • Development of off Line and on line measurement tools

  • Process and processing route modeling

  • Life cycle assessment of our products

  • Support to plants for quality, cost, reliability improvements …



Industrial Operations R&D Centre



Facilities dedicated to water cooling

  • Neptune pilot

    • Gas heating, control of the atmosphere
    • Horizontal
    • Thick product
  • Lotus pilot

    • Induction heating
    • Vertical/horizontal
    • Thin strip (max. 2mm)


NEPTUNE: combined water cooling and descaling pilot for hot rolling process

  • Neptune is a multipurpose "heat transfer" full scale pilot, used

    • to characterise all water cooling technologies in HSM: run-out-tables, interstand cooling rows, skin cooling, descaling


Demonstration



LOTUS: new pilot to study water cooling

  • Surface: vertical or horizontal

  • Width: max. 1000mm

  • Strip (150m/min) or roll

  • Mainly spray cooling



Motivations of ArcelorMittal



Sprays

  • Widely used in steelmaking for cooling applications to cool products and tools

    • Continuous casting
    • Hot rolling
    • Cold rolling
    • Galvanizing line
  • In other industry?

    • Cooling of electronic components (air cooling: free forced  solid jet cooling  spray cooling)
    • Combustion (engines)
  • No real intersection between industries: steelmaking has specifities



Our objectives

  • Reduction of the costs

    • Less pressure
    • Less water
    • Less pumping
    • Less maintenance
  • Better reliability of our processes

  • Be more neutral from the environmental point of view

    • Water is not a common product


Reduction of the costs

  • We are already working

    • Roll cooling (Florange HSM)
      • Amount of water divided by 1.7 (1999-2004)
      • Pressure: 2.25 bars instead of 8 bars
      •  Energy consumption divided by 6
    • Descaling (Florange HSM)
      • Pressure: 140 to low pressure
      •  Energy consumption divided by 15
  • A significant step is already done

  • We are deploying these solutions in ArcelorMittal

  • It is not sufficient!



Better reliability of our processes

  • Reduction of the thermal heterogeneities

  • Reduction of the mechanical heterogeneities

  • Better prediction of the cooling efficiency

    • Literature: Heat Transfer Coefficient as a function of
      • Flow rate  not sufficient to estimate the cooling efficiency
      • Specific flow rate (l/min/m2)  not sufficient to estimate the cooling efficiency
    • Specific flow rate, droplet velocity, droplet diameter, flux of droplet.
    •  We need more physics.


Next steps

  • Next steps

    • Exploit at the limit our tools while minimizing the energy consumption
    • Better prediction of the cooling efficiency
  •  Better understanding of what we are doing

  •  Relevant academic partners and industrial partners





Specific flow rate or flow rate

  • Increasing flow rate (specific flow rate) ≠ increasing HTC or cooling efficiency!




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