High-class continuous annealing and hot-dip galvanizing lines

18 Pages·2011·3.18 MB·English

High-class continuous annealing and hot-dip
galvanizing lines for a growing market
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Markus Jaenecke H
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Senior Project Manager Sales al ·
Strip Processing Lines Division enti
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SMS Siemag AG onfi
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MINERALS METALS METTALLURGY & MATERIALS - 8th International Conference 2011 13 February, 2011 1
Growing market
Steel consumption in India will increase enormously
(cid:1)
Consumption per capita in India only 10% compared to China
(cid:1)
Estimations forecast an increase of Indias steel consumption by 14% compared to a
global increase of 5%
(Source: FAZ, 01.02.2011)
Steel consumption per capita (in kg/capita) Total production of crude steel (in mio. t)
450 600
405
400
500
350
300 400
250
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200
150 200 H
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2000 2003 2006 2009 2000 2003 2006 2009 ntial ·
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Europe China India Source: Worldsteel Association, Steel Statistical Yearbook 2010 nfi
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Rising demand of high strength steel
High-strength steels are required for modern small and light vehicles
Use of high-strength steel grades in compact Percentage of steel grades in the overall
cars weight of a vehicle
6% 4%
10%
17%
22%
50%
94%
90%
74%
33%
1980 1990 2000 2005
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Ultra-high strength steels M
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High-strength steels al ·
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High-class processing lines for a growing market
Different line types for galvanizing and annealing
(cid:1)
Continuous Annealing Lines
(cid:1)
Combined Annealing or Galvanizing Lines
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Hot-dip Galvanizing Lines
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Hot-strip Continuous Galvanizing Lines (Heat-to-Coat)
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Galvanized and Annealed steel strip
Important process steps for manufacturing high-quality steel strip
Post-treatment
Galvanizing
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Cleaning Comprehensi ve production know -how al ·©SMS Holdi
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MINERALS METALS METTALLURGY & MATERIALS - 8th International Conference 2011 13 February, 2011 5
New developments
New developments & optimized concepts
Cleaning Annealing Galvanizing Post Treatment
Cleaning section Ultra Fast Cooling Air-knife Nickel-Flash
DFI Oxyfuel Water-Quench Strip Stabilization Roll-Coater
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Comprehensive production know-how di
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Cleaning section
Efficient cleaning section vertical spray and electrolytic cleaning cells,
horizontal brush cleaning and cascade rinsing
(cid:1)
Simple roll change possible during production
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Energy saved through low evaporation losses
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Heated by exhaust gas of furnace section
Cleaning section in a Continuous Annealing Line
Brush cleaning Brush rinsing Cascade rinsing unit
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Spray cleaning Electrolytic cleaning Dryers nfid
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REBOX® DFI Oxyfuel
Installation of a REBOX® DFI oxyfuel system in a continuous annealing line
Process Advantages when used in proceesing lines
(cid:1) (cid:1)
Gaseous fuel is burnt with pure oxygen Extremely efficient heat transfer
(cid:2)
Reduction in furnace length
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To preheat the strip, the flame is directed
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Increase in furnace output for
specifically at the steel strip.
modernization projects
(cid:1)
DFI = Direct Flame Impingement
(cid:1)
Residual oils and solid particles are
removed from the strip
(cid:2)
Simplification of the pre-cleaning
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REBOX® DFI Oxyfuel
Effects on the design of a continuous annealing line
(cid:1) Thanks to REBOX® DFI, a strip processing line can be set up much more economically
(cid:1)
Lower investment and operating costs
(cid:2)
In the furnace, the preheating zone and a part of the heating zone can be replaced
(cid:2)
In the cleaning zone, certain sections can be removed (electrolytic cleaning, brushes)
(cid:1)
Nitrogen oxide emissions are reduced through combustion with pure oxygen
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The production capacity can be increased by 30% if the plant is modernized
Simplified cleaning section of a CAL CAL furnace with REBOX® DFI syste,
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Ultra Fast Cooling System
Producing high-strength steel grades with high cooling rates
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Production of high-strength steel grades up to 980 MPa (TRIP & DP)
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Cooling rates of up to 130 K/s/mm are attained
(cid:1)
Direct supply of hydrogen into the cooling chamber enables a hydrogen content
of 20 to 30% in the cooling area without increased hydrogen consumption
(cid:1)
Natural diffusion of hydrogen in the adjoining furnace sections
- No complicated separation between cooling zone and neighboring zones
- No additional hydrogen consumption compared to the traditional operation with
5% hydrogen in the shielding gas (forming gas)
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