Hot Strip Mill

Hot Strip Mill

Consists of:
Single Slab Reheat Furnace
• Type: Walking Beam
• Manufacturer: Davy
• Capacity: 150 t/h
• Inside Refractory Width: 8,35 m
• Effective Length: 32,6 m
• Slab Thickness: 160 mm
• Slab Maximum Length: 7,5 m
• Primary Fuel: mixed BFG and COG
• Alternate Fuel: N°6 Fuel Oil
• Commissioned in 1995

Water Descalers
• Primary descaler at slab reheat furnace run out table
• Front and back 3 Hi Rougher Mill descalers.
• Finishing Mill descaler at run-in table.

Water Descaling Pumps
• Manufacturer: Union Pump Company
• N° of Pumps: Two (one operating, one stand by.)
• Power: 5.000 HP (3.730 kW)
• Pump Speed: 4.500 rpm
• Discharge Pressure: 127 barg (1.840 psig)

Rougher Mill
• Type: 3 Hi, one stand 22" x 34" x 100" Reversing Mill
• Manufactured by Blaw-Knox in 1923.
• Main Motor : Synchronous type
• Main Motor Power: 6000 HP
• Motor Speed: 250 rpm
• Maximum Rolling Force: 700 t
• Maximum Edger Force: 100 t
• Edger Motor Power: 300 HP (224 kW)
• Transfer Bar Speed: 2,9 m/s

Crop Shear
• Drum Type Rotary Crop Shear
• Manufacturer: United
• Maximum Transfer Bar Section: 32 x 1575 mm at 940 °C, 0,4%C Carbon Steel
• Maximum Transfer Bar Speed: 2.5 m/s

Finishing Mill
• Type: 4 Hi 6 Stands
• Mechanical Manufacturer: United
• Electrical Manufacturer: General Electric
• Roll Barrel: 1.727 mm (68”)
• Work Rolls Diameter: 699 mm (27,5”)
• Back-Up Roll Diameter: 1.380 mm (54”)
• Maximum Rolling Force Stands 1 to 4: 2.400 t
• Maximum Rolling Force Stand 5: 2.000 t
• Maximum Rolling Force Stand 6: 1.600 t
• Electromechanical Screw down Stands 1 to 4
• Electromechanical Screw down & hydraulic capsules in Stands 5 & 6.
• 40 t per chock work roll bending per stand.
• Main Drives Stands 1 and 2: 6.000 HP (4.476 kW)
• Main Drives Stands 3 to 5: 5.000 HP (3.730 kW)
• Main Drive Stan 6: 4.000 HP (2.984 kW)
• All main drives are DC with thyristor speed control.
• Maximum Finishing Speed: 830 m/min
• Two X-Ray Gages
• Commissioned in 1970 (Stands 3 to 6) and revamped in 1995 (Adding Stands 1 & 2)

Laminar Cooling
• Seven Cooling Sections
• Three Control Zones
• Total Water Flow: 5.270 m³/h
• Upper Face Cooling: 4.100 m³/h
• Bottom Face Cooling: 1.170 m³/h
• Water Pressure: 2,5 barg

Single Downcoiler
• Two Wrapper Rolls pneumatically activated.
• Maximum Coil Width: 1.575 mm (62”)
• Maximum Coil Weight: 20 t
• Maximum Coil Diameter: 1.727 mm (68”)
• Mandrel Diameter: 724 mm (28.5“)
• Strip Thickness: 1,8 to 12,7 mm