Sollac Fos sur Mer Dofasco 2 Hot Strip Mill 3 Reheat Furnaces Rougher Finishing Mill Runout Table Coilers Slab 216 mm Transfer Bar 30 mm Strip 1216 mm thick 5081600 mm wide Advanced Hot Mills ID: 653435
Download Presentation The PPT/PDF document "Hot Rolling Mill 2 Fig. 16 – General l..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1Slide2
Hot Rolling Mill
2
Fig. 16 – General layout of a large capacity hot strip mill (
Sollac
Fos sur Mer)Slide3
Dofasco #2 Hot Strip Mill
3
Reheat Furnaces
Rougher
Finishing Mill
Runout Table
Coilers
Slab
216 mm
Transfer Bar
~30 mm
Strip
1.2-16 mm thick
508-1600 mm wideSlide4
Advanced Hot Mills
4Slide5
Gallatin Steel (CSP)
5Slide6
Thin Strip Casting
6Slide7
Reheating Furnaces
7
Figure 3.8 Walking beam furnace at SSAB, Domnarvet.
Figure 3.9 Evaporative cooling system on walking-beam furnace at SSAB, Domnarvet.Slide8
Reheating Furnaces
8
Figure 3.7 Sketches illustrating operation of a walking-beam furnaceSlide9
Slab Reheating
9
Figure 3.5 Heating time as a function of slab thickness
Figure 3.6 Furnace heating capacity as a function of slab thicknessSlide10
Hot Mill Layout
10
Stand or Unit
Stand Type
Roll Sizes (in.)
Speed (fpm)
Drive Power (hp)
Remarks
Vertical edger
First rougher
2-hi
46
48 x 68
250
220
1500 ac
4500 ac
Back-passing
provision
hydraulic roll changing
Second rougher with 33 inch vertical edger
2-hi
48
x
68
220
4500 ac
Space available for future back passing
Third rougher
with 33 inch vertical edger
4-hi
42 & 56 x 68
330
8000 ac
Gear drive and pinion stand. Gear
type spindles and hydraulic roll changer
Fourth rougher
4-hi
42 & 56 x 68
330
dc drive for speed
Foundations only for future installation
Fifth rougher
Crop shear
Scale breaker
4-hi
42 & 56 x 68
658
250/500
8000 ac
Six finishing stands (F1-F6)
4-hi
28 & 56 x 683240 out of F67000 (each)Rapid work-roll changing electric loopers, AGCSeventh stand3740 out of F7Future installationTwo X-ray gages Width gage Runout tableTwo coilers500 eachAbout 500 ft long 3-blocker roll type
Table 3.3 Basic Data For 68-Inch Hot Strip
MillSlide11
Roll Stack
11
Bending system
Four-high millSlide12
Mill Stand
12
4 high mill system in Mae West designSlide13
Mill Housing
13Slide14
Mill Stand
14
Figure No. 3 Mill Stand ElevationSlide15
Strip Edge Drop
15
Edge drop compensation
Elastic deformation of roll assembly under rolling conditionSlide16
Strip Shape
16
Shape CalculationSlide17
CVC Crown Control
17
Continuously Variable Crown (CVC)Slide18
Pair Cross Mill
18
Figure 7.1 Construction of PC mill (Tsukamoto and Matsumoto)Slide19
Roll Bite Forces
19
Physical Forces within the Roll BiteSlide20
Sims Diagram
20Slide21
Cold Mill Layout
21
Typical layout and material flow of a cold rolling millSlide22
Pickling Line
22
Table 6.3 Design Characteristics of a Modern Pickling Line
DIMENSIONS
LINE SPEEDS
Strip thickness: 1 to 6
mm
Strip width 1000 to 1850 mm
Coil
OD maximum: 2200
mm
Coil ID entry: 620 to 850
mm
Coil ID exit: 600 mm
Coil
weight: 39 tons
Entry speed: 600 m/minSpeed in pickling: 220 m/minExit speed: 350 m/min
Acceleration time: 10 SecondsEmergency stop: 5 secondsLine length: 200 metersSlide23
Cold Rolling Mill
23
4-high reversing cold rolling and temper millSlide24
Tandem Cold Mill
24
Main equipment of tandem cold millSlide25
Gauge Control
25
Thickness control for tandem cold rolling millSlide26
Cleaning Line
26
Figure 23.1 Schematic arrangement of a typical electrolytic cleaning lineSlide27
Batch Annealing
27
Figure
23.29 Single-stack coil-annealing
furnace with base, fan, inner cover and fan coils with convectors (
Rao
et al.).
Figure
23.12 Time-temperature cyclesSlide28
AlN Precipitation During
Coiling
28
Role of AlN precipitation during subsequent annealing
:
Batch annealing
: AlN precipitation during annealing
preferred
Continuous annealing
: AlN precipitation during coiling preferredSlide29
Continuous Annealing
29Slide30
Continuous Annealing
30
Table 23.19 Fukuyama Works No. 1 Continuous Annealing Line*
Material
Thickness
Width
Entry and delivery coils
ID and OD
Weight
Line speed (cold rolled strip)
Entry section
Furnace section
Delivery section
Line speed (black plate for tinning)
Entry section Furnace section
Delivery section Capacity Cold rolled strip Black
plate for tinning
Cold rolled mild steel strip0.15 to 0.8 mm457 to 1067 mm508
x 2440 mm 32,000 kg max
188 m/min
150 m/min
188 m/min
572 m/min
457 m/min
572 m/min
24 tonnes/hr (0.6 mm
x
800 mm)
44 tonnes/hr (0.254 mm
x
813mm)
Table 23.20 Mechanical Properties, 0.8 mm Strip
Continuous annealing
Batch annealing
Yield stress (kg/mm
2
)
Tensile strength (kg/mm
2
)
Elongation (%)
Erichscn value (mm)
r-value
CCV, mm
22.0
32.9
45.0
10.1
1.51
37.8
22.2
32.046.510.41.2637.9Table 23.21 Properties of soft tinplate, 0.32 mm thick Continuous annealingBatch annealingYield stress (kg/mm2)Yield point elongation (%)Tensile strength (kg/mm2)Elongation (%)Erichscn value (mm)Hardness (hr 30T)ATC (µA/cm2)IYV (µg/3 in2)PLT (s)28.12.134.336.68.954.80.023.5333.05.436.437.09.355.00.077.75*Note: Capacity for cold sheet can be increased through additional heat input of the accelerated over-aging zone.Slide31
Microstructure Evolution During Cold
Rolling
31
Deformation
Work hardening
Ferrite (
a
) / PearliteSlide32
Microstructure Evolution During
Annealing
32
Preheat
Soaking
Cooling
Over-aging
Final Cooling
Recovery
Recrystallization
Grain growthSlide33
Temper Rolling
33
Figure
24.3 Yield strength variation with elongation
Figure
24.2 Stress-strain curves: (a) box-annealed rimmed deep-drawing steel; (b) diagram illustrating offset method for determining yield strengthSlide34
Temper Mill
34
Figure 24.10 Layout of temper and processing line (TPL) facility (Fujiwara et al.).Slide35
Tinning Line
35
Fig. 18 - Layout of an electrolytic tinning lineSlide36
Hot Dip Galvanizing
36
General characteristics
Material:
cold rolled mild steel strip
Entry YS 800 MPa maxi-200 MPa mini
Exit YS 140 MPa mini
Strip width:
Mini 750 mm
Maxi 1850 mm
Strip thickness:
Mini 0.30 mm Maxi 1.6 mm (2 mm with allowance)
Coil dimension Entry Exit
Line speed
Engagement 0 to 60 m/mm
Entry 20 to 200 m/mm (240)
Treatment 40 to 150 m/mm (180) Exit 20 to 200 m/mm (240)
Commissioned in 1991
Outside diameter mini 1200 mm mini 1200 mm maxi 2100 mm maxi 2100 mm
Inside diameter
610 mm 506-610 mm
Weight
31000 kg
31000 kg
Fig. 4 - Schematic layout of a hot dip galvanizing line