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TRANSCRIPT
Development opportunities of spring
steel with innovative hot rolling
technology
7th International Congress of Springs
Berlin – September, 21st 2013 Dr.-Ing. Peter Janßen
2
Gliederung
1. ArcelorMittal Duisburg2. Design New Wire Rod Mill3. Capabilities New Wire Rod
Mill4. Product Improvement5. New Products6. Opportunities for Spring
steel7. Conclusions
3
ArcelorMittal in Germany
Hamburg
Bremen
Eisenhüttenstadt
Duisburg (2)
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ArcelorMittal Ruhrort
Continuous Casting Steel Mill Billet Mill
New Wire Rod Mill
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New Wire Rod Mill (Ruhrort)Layout
billet charging grid
roller table
walking beam furnace 110 t/h
roughing mill (4 stand)
insulated roller table (58 m)
intermediate mill (6 CL-stands)
rod feed line (6 CL-stands)
2 CL-stands
loopcooling conveyer (104,5 m)
coil handling
pinch rolllaying head
finishing block 2(4 stand)
finishing block 1(6 stand)
Finishing block 2
One family rolling
All final sizes in the last stands
increased flexibility
increase of utilization
decrease of consumables
Target production
450 kt/a = 14 production shifts/ week650 kt/a = 20 production shifts/ week
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Furnace, Roughing Mill and Intermediate Mill
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Second Finishig Block, Water Cooling and Air Coolin g line
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Air Cooling line
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Central Control Room
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Tolerances Single line rolling with only H-V-stands will ensure best tolerances (≤ ¼ of DIN)
Advanced cooling technology in water cooling and Stelmor line will allow an optimised scale formation
Twist-free, single-line rolling with fast roughing train is best available technology for an excellent surface
New furnace technology guaranties lowest wire rod decarburisation
Furnace technology, thermomechanical rolling and the 104 m long Stelmore cooling line will result in best wire rod properties for advanced application
Quality Improvement
Surface quality
Micro structure
Decarburization
Scale formation
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Thermomechanical Rolling
400
500
600
700
800
900
1000
1100
1200
1300
Time
Tem
pera
ture
[°C
]
Roughing mill
Intermediate mill
Wire rod block
Air cooling
LOOP
Conventional rolling
TM-rolling
Development Opportunities 54SiCr6
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Temperature development without cooling Temperature development with cooling
September 21 st 2013 Dr. Peter Janßen
3-fan LCC®
nozzle deck arrangment with individual blowing
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3 Fan Technology – Air Cooling Line
Hochfeld New Wire Rod Mill
� Smaller Scatter Band of Temperature – Air Cooling 1 3mm Spring Steel
Air Cooling of 12mm Spring Steel Wire Rod
September 21 st 2013 Dr. Peter Janßen
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First Results - Grainsize
CHQ, 13 mm Ø, ASTM > class 8
Wire Rod Mill
Hochfeld
CHQ, 13mm Ø, Korngröße > 10
New Wire Rod Mill -Optimized Cooling
Without Thermomechanical Rolling
First Results - Mechanical Properties Scatter Band on a loop 54SiCr6
September 21 st 2013 Dr. Peter Janßen
40
50
60
70
80
90
100
800
850
900
950
1000
1050
1100
0 2 4 6 8 10
RO
A [%
]
UT
S [
MPa] UTS [MPa] ROA [%]
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Decarburization - 13mm 54SiCr6
Hochfeld: 151 µm New wire rod mill: 61 µm
Bainitic SteelsSOLAM B 1200 / SOLAM B 1100
• Registered Trademark• SOLAM = Steel
Solution of ArcelorMittal
• B = Bainite• 1200 = UTS 1200
MPa• Mechanical properties
comparable to quenched and tempered steelSeptember 21 st 2013 Dr. Peter Janßen
19 mm Wire Rod as rolled
SOLAM B 1200
• As rolled condition• Bainite with small
amounts of Ferrite and Martensite
• No heat treatment required
• Just calibration instead of drawing
September 21 st 2013 Dr. Peter Janßen
Development of New Products
� Bainitic Steel
� TRIP Steel
� Multi Phase Steel
� New high strength steel
� Ultra Fine Grain Steel
� Customer Tailored Products
� New products fit for final use products
September 21 st 2013 Dr. Peter Janßen
Conclusion
• Innovative mill design• Promising first results• Significant quality improvement can be expected• Huge development potential• Wire rod with controlled cooling up to 25 mm• First new steel type already available (Bainitic steels)• Several steel types under develoment
September 21 st 2013 Dr. Peter Janßen
Dr. Peter Janßen
Thank you!