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8/2/2019 Multimetals Presentation on Annealing and Pickling
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Submitted By:
VISHESH VIJAY
7th SEM. ECE
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ORGANISATION PROFILE
Founded - 1962
Founder - MIKE JOHNSON
Headquarter s - U.S.A.
Products - Copper Tubes , 95/5 CuNi
&Cunifer Tubes 90/10 CuNi
Tubes 70/30 CuNi TubesRevenue - US $2.210 billion
Income - US$ 154 million
Employees - 3012 (2010)
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STEPS FORSTEPS FOR
MANUFACTURINGMANUFACTURING
INDUSTRIAL COPPERINDUSTRIAL COPPERUncoiling of CRFH
Coil at uncoilerWelding Degreasing
Entry looperAnnealing
in furnaceCooling section
Pickling Exit looper Skin pass mill
Tension levelerCreep looperRecoiling of
CRFH coil
at exit
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WELDING SECTIONWELDING SECTION Type -Guild Model QMM 125-54, Quick lap Seam Welder Material 200,300,400 CRSS Max. Strip Width 1300mm Min. Strip Width 600 mm Max. Strip Thickness 3.0mm
Min. Strip Thickness 0.3mm Electrics 415/3/50Weld Process Continuous Seam
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Degreasing sectionDegreasing section (i) First degreasing stage - Spray degreasing
machine (ii) Second degreasing stage - Chemical scrub brush (iii) Rinsing section - 3 Stage cascade rinsing
(iv) Length of degreasing section 18.15 meters (approx)
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ANNEALING FURNACEANNEALING FURNACEAnnealing is done to:
1. To regain grain structure
2. To increase malleability and ductility.
3. To attain mechanical properties.
ANNEALING STAGES
1. Recovery
2. Recrystallization
3. Grain growth
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Cooling Furnace section
Length of Section is 135 m
10 Air Jet Cooling Chamber
2nd & 9th Jet Cooling chamber is havingMist cooling also to assist avoiding carbide
precipitation..
Length of Cooling Section 52.5 m
6 burner control Zone
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Jet cooling section
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PICKLINGPICKLINGThe function of pickling is to dissolve/ remove/ peel off oxide layer on surface
of strip.
Such oxide layers are formed during hot rolling and incase of cold rolled strip during annealing operation.
Pickling is done in three sections:-
Neolyte electrolytic pickling section
Nitric Electrolytic Pickling Section
Mixed Acid Pickling Section
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COIL AFTER PICKLINGCOIL AFTER PICKLING
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Skin Pass MillSkin Pass MillSkin passing is done to
1. To improve strip shape.
2. To impart the desired surfacefinishto steel.
3. To produce desired mechanicalproperties.
4. To eliminate minor surfaceblemishes.
5. Masking of yield point
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Tension LevelerTension LevelerThe purpose of tension leveling is to bring all the fibers
in the metal to equal length
To achieve Desired strip elongation(0-2%) and strip flatness
Tension leveler consists of Entry bridle, Tension leveler wettype process, Exit bridles
Type wet type.
Design One set of bending roll cartridge
Two sets of anti cross bow roll cartridge
Tension 350 KN (max.)
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DCS Hardware
Controller card
Input cards (4-20mA,Thermocouple,RTD ,Digital,SOE).
Output cards(4-20 mA
,digital)Power supply module.
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Benefits of DCS are:High reliability.
Improved response time.
Improve operator interface to plant.Improve accessibility of plant data to
engineering & management personals.
Historical storage and retrieval system.
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Programmable logic
controllerA programmable
logic controller (PLC)or programmable
controller is a digitalcomputer used forautomation ofelectromechanical
processes, such ascontrol of machineryon factory assemblylines.
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Difference b/w DCS and PLCsDCS PLCs
Wide Range of
communication.Used for the entire plant
It is redundant
Response time is higherSettings can be change
Does not have wide
range of communicationUsed for particular unit
Not redundant
Very less response timeOnly vendor can change
the setting
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SCADA
SCADA stands forSupervisory Control And Data
Acquisition.
It generally refers to industrial control systems:
computer systems that monitor and control
Industrial infrastructure or facility-based processes,
include those of manufacturing, production, power
generation,Fabrication and refining.
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Transducers
Installed in furnaces to measure, monitor and
regulate the temperature
There are so many type of transducers:
Temperature transducer
Pressure transducer
Flow transducer etc.
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Resistive TemperatureDetectorRTD: Probably the most common temperature sensor
is the metal RTD or Resistive Temperature
Detector, which responds to heat by increasing
its resistance to electric current. The freezing
temperature of water is used as the reference
temperature.
R = R0 (1+T) for +ve temp coeff.
R = R0 (1-T) for -ve temp coeff.
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Characteristic curve of RTD
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Characteristic curve of Thermocouple
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3. Strain gauges:
strain gaugesare sensors that measuredeformation due to pressure. the strain
gauge is stretched; the conductorreduces its cross-sectional area and thuscan carry less current. the change inresistance is small and so requires a
reference resistance and compensatingcircuitry to compensate for other sourcesof resistance changes (such as temp.)
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