56´´ WIDE HOT STRIP MILL (USED)
Inventory #: VX-17360

Specifications

General Specifications:
Nominal Capacity: 2,300,000 TPY
Maximum Undelayed Rate: 350 TPH
PIW: 575
Products: Low Carbon, High Carbon, HSLA, Scalp
Slab Size Maximum: 9.45" x 52" x 216" (15 Tons)
Coil Width Maximum: 52"
Coil O.D. Maximum: 60"
Coil I.D. Maximum: 30"
Coil Weight Capacity Maximum: 30,000 Lbs
Finished Gauges (Nominal): 0.5" to 0.056" in widths 20" to 51"
Descale Pressure: 2000 psi, 1964
Descale Stations: 4
Furnaces: 5 - Furnaces. 3 Zone Pusher type
Rolling temperatures up to 2350 Deg F.
Coke oven gas, natural gas and oil fired
No 1 Rust Furnace Co., 1940 (Rebuilt 1980)
No 2 Rust Furnace Co., 1946
No 3 Rust Furnace Co., 1952
No 4 Salem Brosius, 1965
No 5 Salem Industries, 1972

Line Includes:

Vertical Edger: Dominion Engineering, 1957
29" to 33" Diameter x 108" Rolls
1500 HP Single Motor Drive

110" Roughing Mill: Mesta, 1941
Four - Hi Reversing Mill
48" to 52" diameter x 108" Backups
35" to 39" diameter x 110" Work Rolls
5000 HP Single motor drive
Operated @ 7200 HP RMS with active cooling
Back Up Roll Chocks - 8 (ie: 2 Per Roll, Enough for 2 Top Rolls and 2 Bottom Rolls)
Work Roll Chocks - 8 (ie: 2 Per Roll, Enough for 2 Top Rolls and 2 Bottom Rolls)

Coil Box: Stelco / Mesta, 1980

Crop Shear: Dominion Engineering
1-3/8 " cut capability @ 52" wide
275 HP / 550 HP

Scale Breaker: Mesta, 1945
16" Diameter x 56" Wide
75 HP
Roll Chocks - 8 (ie: 2 Per Roll Enough for 2 Top Rolls and 2 Bottom Rolls)

56" Finishing Stands: (6) Stands, Mesta, 1945
4 - HI Mills
47" Diameter x 55" Backups
23" Diameter x 58" Work Rolls
Backup Roll Chocks - 48 (ie: 2 Per Roll, Enough for 12 Top Rolls and 12 Bottom Rolls)
Work Roll Chocks - 44 (ie: 2 Per Roll, Enough for 11 Top Rolls and 11 Bottom Rolls)

Stands 1 to 5 have 3500 HP single motor drives
Stand 1 upgraded to 5000 HP, 1980
(Nameplate remains 3500 HP)
Stand 2 upgraded with a 5000 HP Armature, 1970s
(Nameplate remains 3500 HP)
Stand 6 has a 3000 HP single motor drive

Width Gauge: (1) Kelk Accuband - 5, 1988

Thickness Gauges: (2) DMC IGGI Sentinal 500, 1986
Continuously profiling

Laminar Cooling: (4) Banks, 14,000 usg per min (Maximum)

Downcoilers/Upenders: (2) Dominion Engineering, 1964
1/2" Thick (Maximum)
2300 FPM (Maximum)
375 HP Mandrel

Weigh Scales: Systems Association Inc. 7000 (Rebuilt 1995)

Cooling Conveyor / Downender: Eye Vertical Javis B. Webb pallet style, 1964
400 Ft long

Banding / Marking: Manual

The original install dates for the mill are:
1941 for: Furnace 1
110" Roughing Mill
1945 for: 6 Stand Finisher

There have been significant improvements to the mill and the controls through the years.

Furnace Area:
Furnaces 2 through 5 were built between 1946 and 1972. All of the controls for the furnace movement remain CP
type control. In 1996 the Operator controls were replaced and consolidated to one pulpit. This was accomplished
using a new computer scheduling system, new mill feedback devices and PLC interfaces to the existing CP
controls. The furnace heating controls were also upgraded though the 1990s replacing the pneumatic controls
with modern electronic controllers. New flame safety systems were installed in the late 1980s.

Rougher Area:
The Descale systems were upgraded to 2000 psi pumps in 1964. New operator controls for these systems were
installed in 1996 implemented through PLC interface and new mill feedbacks.

The Rougher Entry and Exit tables were re-powered in 1996 with new SCR base drives with a digital control on
the front end. Their speed and direction are controlled automatically. In 1996 all new Operator controls were also
included.

The Rougher Side Guards were re-powered in 1996 with new SCR base drives with a digital control on the front
end. New digital feedbacks were included and the cross shafts were removed. The system is fully position
regulated.

The Rougher Screw Downs were re-powered in 1996 with new SCR base drives with a digital control on the front
end. The motors were increase in size to 100 HP per side. New digital feedbacks were included and the cross
shafts were removed. The system is fully position regulated.

The Edger Gap Adjust was re-powered in 1996 with new SCR base drives with a digital control on the front end.
New digital feedbacks were included and the cross shafts were removed. The system is fully position regulated.

Although the main motor supplies remain M-G set the field supplies for the Generators and the Main mill motors
for the Rougher and Edger were replaced in 1996 with new SCR base drives with a digital control on the front
end. New digital feedbacks and Speed regulated controls were included.

In 1996 all new Operator controls were included with an automation system on mill set-up and operation. Under
normal operation the operator is in control of the speed and direction of the mill. All other operations are
automatic.

The transfer table power supplies were replaced in 1980 with GE solid state SCR packages and control. In
1996 the operator interface to these packages was upgraded and automated through a PLC and Digital
control and new interfaces.

Finisher Entry Area:
The Coil Box (CB) was installed in 1980. All controls for this are Solid state. The drives for the CB are SCR
based. The CB PLC was upgraded in 1996. The CB can operate in a fully automated mode. A new
monitoring and fault analysis system was installed in 1996. With the exception of monitoring, the CB
operator controls remain from 1980.

The Crop Shear was refurbished in 1980. The crop shear control was replaced in 1985 with Solid state
GE control. The MG set remains as the main supply. In 1996 all new Operator controls were included
with an automation system. This interfaced into the existing 1985 controls using digital controllers and
PLC control.

The Scale Breaker generator and motor field supply and control were replaced in 1980 with Solid state
GE control. The MG set remains as the main supply. In 1996 all new Operator controls were included with
an automation system. This interfaced into the existing 1985 controls using digital controllers and PLC
control.

Finisher Area:
The Finishing Mill (FM) has an original common bus power supply fed by four 3500 kW DC generators.
Stands 3 through 6 main mill motors are original. They have been well maintained. In the 1970s
Stand 2 armature was replace with a new 5000 HP unit. In 1980 Stand 1 motor (Armature and Field
frame) was replace by a 5000 HP unit. The nameplates on these motors remain at 3500 Hp. In 1980
the Voltage control for the bus was changed to GE solid state. In 1980 a solid state Water Cooled SCR
power supply was added to bus increasing the available power by more than 10,000 kW.

In 1994 the Side Guard motors and control were changed to AC with VF drive control through a PLC.
New position feedbacks were installed and a new position regulation and setup control was installed.

In 1987 a new Kelk stereoscopic width gauge was installed. In 1998 the X-Ray gauges were rebuilt.

In 1996 the following was replaced or added:
All new Operator controls in a new pulpit
An automation system including automated Mill Set-up. The new system consisted of Computer based
set-up and digital operator screens. PLCs for the digital setup and control and a Digital Controller
system for the regulators and drive controllers. The mill sets automatically after an operator command.
There is a feed forward model to adjust the setup bar to bar. A new auto level on setup system was included.
New Screw Down Drives and motors for Stands 3 through 6 increasing the HP by 50%.
New Screw Down Position Regulation and Feedback with a split East West control.
New Auto Gauge (BISRA) controls on Stands 1, 3 and 5. A width and X-Ray feedback loop is also incorporated.
New force measurement feedback on all stands.
New field packages for the Main Mill motors
New speed feedbacks and regulation system for the Main Mill motors.
New Armature and field packages, regulators, feedbacks and controls for the Loopers.
New mill floor displays and controls.
New radio control for the mill equipment (Screws and Side Guards)
All new operator controls and new PLC system for the laminar flow models and loop controllers.

This mill is operated tight with the loops down. The loopers are only used if there is slack between stands.
The control loops for the loopers to operate in a regulation mode were added in 1996. The mill is not
operated in this way because of the mechanics of the loopers and the common bus control.

A new computer and PLC based mill monitor and annunciation system was added in 1996. This includes
the drive systems and the Oil Cellar systems. A full logging system was implemented in 1996 following
most mill parameters recording any change by the operator or the system logging the date time and the
amount of change on the equipment from the furnace to the Laminar Sprays.

Down Coiler Area:
The Down Coilers were replaced in 1964. For the most part the controls remain the same from that time.





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