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SECONDARY What is the secondary steelmaking?
STEEL MAKING
PROCESS METALLURGY Ali ALTUN 060110292
Bilal DEMİR 060100281
Doğan ARSLAN 060130301
CÜNEYT ARSLAN Gamze H. TERZİ 060120420
Güney AKDAŞ 060100349
10.04.2015 Mammadhuseyn MAMADZADA 060100912
Reha SAVAŞERİ 060120525
Selin BULUT 060110327
Semih GÜRSOY 060110317
Tolga EKER 060100326
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REACTIONS TAKES PLACE IN SECONDARY STEELMAKING
GENERAL OVERVIEW
1. de-oxidation ,
• Secondary steelmaking is a 2. vacuum degassing,
step between steel production
and primary processes. 3. alloy addition,
4. inclusion removal,
5. inclusion chemistry modification,
6. de-sulphurisation
7. homogenisation
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SECONDARY STEELMAKING STIRRING
Ladle stirring is an essential operation during secondary steelmaking in
order to:
LADLE ARC • homogenize bath composition;
STIRRING
FURNACE • homogenize bath temperature;
• facilitate slag-metal interactions essential for processes such as
desulfurization;
LADLE DEGASSING • accelerate the removal of inclusions in the steel
INJECTION In practice, stirring is achieved by:
• Argon bubbling through the liquid steel, either via a submerged lance,
or by porous plugs in the bottom of the ladle;
• Electromagnetic Stirring - EMS
CAS-OB
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TOP LANCE INJECTION OF ARGON BASAL INJECTION OF ARGON
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ELECTROMAGNETIC STIRRING (EMS) LADLE ARC FURNACE
• Purpose of ladle arc furnace is heat to steel
• Elelectrods
• Alloy Chute
• Cooling parts
• Fume extraction
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LADLE INJECTION DEGASSING
1. Tank Degasser
• The aim of powder injection in ladle furnace is to
reduce sulphur content in molten steel
• Used mainly to remove sulfur and other impurities
• This is achieved through slag – metal reacitons and
favored by the argon bubbling in a vacuum chamber
Why it is necessary?
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DEGASSING DEGASSING
• 2. Recirculating Degasser :
• 3. Stream Degasser :
• Used mostly to assist • Used mainly to remove hydrogen
decarburization. content
• Argon is injected through one and • Molten steel is poured into another
vessel which is under vacuum
forces the steel to circulate out
• Degasssing occur during the fall of
through the other snorkel. molten stream
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CAS-OB (Composition Adjustment by Sealed Argon SCIENTIFIC BACKGROUND
Bubbling - Oxygen Blowing)
Allows • Deoxidation
• Alloy additions
• The simultaneous addition
Used for chemical reheating
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SCIENTIFIC BACKGROUND SCIENTIFIC BACKGROUND
• Decarburization • Desulfurization
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SIMULATION SIMULATION
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SIMULATION SIMULATION
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SIMULATION SIMULATION
RESULTS :
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SIMULATION SIMULATION
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REFERENCES
1. Turkdogan, ET, Fundamentals of Steelmaking, The Institute of Materials, 1 86125 004
2. ISE, The Making, Shaping and Treating of Steel - Steelmaking and Refining Volume,
The AISE, Steel Foundation, 0-930767-02-0
3. AISE, The Making, Shaping and Treating of Steel - Steelmaking and Refining Volume, The
AISE Steel Foundation, 0- 930767-02-0
4. Turkdogan, ET, Fundamentals of Steelmaking, The Institute of Materials, 1 86125 004
5. http://steelx.org/content/html/eng/default.asp?catid=26&pageid=1027690347
6. www.steeluniversity.org
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