6-Hi cold reversing mill Mfc.: Hitachi Type: 6-Hi reversing mill Built: 1976 Shut down: 2014 Revamped: 2010 Control system – changed DC to AC motors Load cells were replaced in March 2005 & thickness gauge in March 2009 Roll coolant cooler was replaced in July 2009 Control boards of hydraulic screw down & electromagnetic valves were replaced in 2009. Strip width: 610 – 1330 mm Thickness Entry: 1.6-4.5 mm Exit: 0.15 – 2.3 mm Coil weight: 21 Ton Entry Coil ID: 550-630 mm Exit Coil ID: 610/508 mm Coil OD: 2050/2050 mm Capacity: 31,000 t/month Roll diameters: Work rolls: 405-440 mm Length: 1420 mm Intermediate rolls: 460-510 mm Length: 1395 mm Back-up rolls: 1220 – 1345 mm Length: 1420 mm Ordinary rolling load: 20 MN Mill speed: 550-1450 mpm Mill motor AC New in 2010 Power: 5000 kW, 1160/430 RPM Gear ratio: 1:1 Response capability of mill motor: 10 rad/sec. Type of mill drive Single drive Pay off reel Single type mandrel Power: 450 kW, 850/310 RPM Gear ratio: 2.2:1 Entry tension reel Single type mandrel Power: 2900 kW, 840/235 RPM Gear ratio: 1:1 Delivery tension reel Single type mandrel Power: 2900 kW, 840/235 RPM Gear ratio: 1:1 Entry guide Vertical roller Screw down Hydraulic type Mill modulus: 4707 kN/mm Response capability: 25 Hz Bearings Work & Intermediate rolls: Taper rolling bearings Lubrication: Oil mist Back-up rolls: Roller bearings Lubrication: Oil mist Roll changing type: Hydraulic drives Roll bending Work rolls Max. load of INC and DEC 255(INC), 0(DEC) kN/chock Intermediate rolls Max. load of INC 0 kN/chock Intermediate shift Pressure gauge Mfc.: ABB Type: Load Cell Thickness gauge Mfc.: Toshiba Type: X-ray Location: Entry & Exit Control system Mfc.: Hitachi Type: R700 Rolling oil System: recirculation Desity measurement: Supersonic Wave Method Roll coolant Dirty tank: 22 m³ Clean tank: 42 m³ Pump capacity Max. pressure: 0.8 MPa Discharge volume: 2.8 m³/min. Installed 3 pumps Operating 2 Filter Type: Magnetic Separator Exhaust fan Motor power: 300 kW 2500 m³/min Cellar ventilation fan Motor power: 30 kW 600 m³/min. Fire fighting Cellar Type: Carbon dioxide, sprinkler Mill Type: sprinkler (water)
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