Zenica Blooming With Continuous Billet

MAIN MILL PARAMETERS:
Blooming with Continuous Billet Mill Year of commissioning: 1952 shutdown 2004
Main suppliers: \"CONTINENTAL\" company, USA
Annual mill capacity: 800.000t/per year.

RAW MATERIAL:
Ingots :
- OK 660 dimensions (660/610x590/540x2.200mm), mass 5,4t.
- V 5,2 dimensions (590/700x480/600x2.150mm), mass 5,2 t.

FINISHED PRODUCTS :
Blooms of square section: 135mm to 320mm
Blooms of rectangular section 220-270 x 280-320 mm.

HEATING FURNACES
7 pit furnaces, made according to project of \"SALEM\" company, USA; Charge is

65 t.
8 tangential burners and central gas main. Natural gas or possible with mixed

gas and masut. Air for combustion is preheated in recuperators.

Characteristics:
- Light diameter of upper ring 4.880mm
- Light diameter of lower ring 6.070mm
- Height of upper ring 1.050mm
- Height of lower ring 800 mm
- Height of cone ring 870 mm
- Total height of work area 2.720mm
- Distance of burners axis from furnace floor 550mm
- Diameter of aperture for gas main 1.020mm
- Chimney height 26.000mm

BLOOMING-BLOCK STAND
One duo-reverse stand with basic roll diameter of 950mm and work length

2.134mm driven with two co-directional engines of power 2.500 HP.
Horizontal Closed Rolling stand; Maximal opening of rolls is 920mm.
Electromechal Vertical moving of upper roll, with two electric engines.
Hydraulic Balancing of upper roll by Axial moving of rolls
Over screws Rolls of block stand :
Semi-steel hardness 240-320HB and forged rolls.
Cradles for rolls bearing:
Forged steel, situated in two post openings of rolling stand.
Rolling bearings: textolite and cooled by water.
Reserve block stand rolls: 5 linings