EDSGN Kick Off Meeting - PowerPoint PPT Presentation

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EDSGN Kick Off Meeting

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EDSGN Kick Off Meeting 2/27/2012 Steelmaking Basics and Project Overview R. Zellers Steelmaking Process Map - Iron Steelmaking Process Map - Refining Basic Oxygen ... – PowerPoint PPT presentation

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Title: EDSGN Kick Off Meeting


1
EDSGN Kick Off Meeting 2/27/2012 Steelmaking
Basics and Project Overview
  • R. Zellers

2
Steelmaking Process Map - Iron
3
Steelmaking Process Map - Refining
4
Basic Oxygen Furnace Raw Materials
Fluxes Coolant Fuel
5
BOF - Reactions
  • Decarburization
  • 2C O2 ? 2CO (reaction occurs in bath, CO to off
    gas)
  • 2CO O2 ? 2CO2 (reaction occurs above bath, CO2
    to off gas)
  • Silicon Oxidation
  • Si O2 ? SiO2 (reaction occurs in bath, SiO2 to
    slag)
  • Manganese Oxidation
  • Mn O2 ? MnO
  • Aluminum Oxidation
  • 4Al 3O2 ? 2Al2O3 HEAT!

6
Chemistry of Open Steel
  • C 0.04
  • Mn 0.1
  • Cr 0.01
  • Cb 0.00
  • Al 0.00

7
BOF Order of Reactions Ellingham Diagram
2Fe O2 ? FeO2
Cr 1/2
C O2 ? CO2
Mn 1/3
Si All
Energy
2C O2 ? CO2
4Cr 3O2 ? 2Cr2O3
Al All
2Mn O2 ? 2MnO
Si O2 ? SiO2
Ca All
2Ca O2 ? 2CaO
4Al 3O2 ? 2Al2O3
Temperature
8
Alloying Why Where?
  • Aluminum Deox, aluminum-nitride grain refining
  • Carbon Strengthener
  • Calcium Inclusion modification, castability
  • Chrome Hardening, corrosion resistance
  • Columbium (Niobium) Grain refining
  • Manganese Strengthener, heat treatment
    hardening
  • BOF during tap Good mixing, allows for
    settling
  • Ladle met facility Greater control

9
Alloy Calculation Example LCAK Mn addition
  • Aim 0.2
  • Already in steel from BOF 0.1
  • Needed from alloy 0.1
  • Heat Size 440,000 lb
  • HC Mn 78 Mn, 90 Recovery (note pure alloy
    in project)
  • Calculation (0.1 Mn/steel) (440,000 lb steel)
    440 lb Mn
  • (440lb Mn) / (78 Mn/HC Mn 90 Recovery) 627
    lb HC Mn

10
Project
  • Part 1 No Off Chemistries
  • Separate advanced high strength steel (AHSS) from
    scrap autos
  • Use mix of AHSS and low carbon aluminum-killed
    (LCAK) scrap to make LCAK heat
  • Part 2 Cost Savings
  • Utilize AHSS scrap to make line pipe heat
  • Calculate addition alloys needed
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