The construction of Compact Strip Process Plant started in early 1997 and was completed in late 2003.
Compact strip plant description:
The production of hot-rolled sheet takes place using electric arc furnace and continuous casting method.
Sheet 1.5 – 12.5 millimeters in thickness and 800 – 1560 millimeters in width with the capacity of 700.000 ton per year
Commercial, drawing, deep drawing, with high weldabilitiy, structural grades for engineering and 409-ferrite anti-rust.
Special Features of Compact Strip Process Plant
A.Production of thin slabs with maximum thickness of 50 millimeters
B.Connection of the thin slab casting machine and rolling mill
C.Enjoying secondary metallurgical facilities such as vacuum oxygen decarburizing vessel and ladle furnaces
The Total Volume of Construction Operations:
Earthmoving: 5.55 cubic meters
Reinforcement lacing: 19.2 thousand ton
Formwork volume: 375,000 cubic meters
Concrete casting (both meager and reinforced): 286.000 cubic meters
Metallic skeleton siding and roofing: 2.15 thousand ton (97.1 thousand cubic meters)
Production Method & Technology Used in Compact Strip Process Plant
The required liquid steel is made with a charge of sponge iron and scrap into a 150-ton electric arc furnace followed by secondary metallurgy operations by means of a ladle furnace and a vacuum oxygen decarburizing vessel. These facilities make possible the production of making clean molten with various alloys. After the molten has been made and the adjustment of the alloy content of it was adjusted, the liquid steel is converted to thin slabs. After scarfing and conditioning, the thin slab enters the tunnel furnace and goes through the six-stand hot strip mill to change into the final product. The product is sent to the market in the form of packaged coils or sheets. The thin slab production line and finishing lines of the hot strip mill are connected and production takes place in a continuous process.
Main Workshops Projected for Compact Strip Process Plant
Material handling and dedusting plant
Electric arc furnace with the scrap storehouse
Ladle furnace (L.F.)
Vacuum Oxygen decarburizing vessel
Thin slab caster
Hot strip mill
Steel Making Plant
Raw materials storage
Scrap yard, DRI storage bins, Ferroalloy storage
150-ton 125-MVA electric arc furnace
Ladle furnace, slag rake, vacuum degassing station, vacuum oxygen decarburizing vessel and trimming station
Fume dedusting facilities
Thin Slab Casting Unit
Ladle turret, tundish car, submerged casting method of casting
Funnel type die for the production of thin slabs with the exit thickness of 60 millimeters
0 -7 segment series
Rotary descaler, shear pendulum
Segments are responsible for bending, directing and final smoothing out of the thin slab, as well as the reduction of the slab thickness, this is done with the slab still molten inside (soft reduction), thus the slab thickness reduces down to 45 – 50 millimeters on one hand, and on the other it improves the quality of the slab and give it a consistent chemical composition and crystalline structure.
Hot Strip Mill
Heating shuttle with the length of 250 meters
Aseries of 6 rolling stands of 4-roll type with hydraulic system consisting of AGC, bending, Shifting units for ensuring a suitable profile of the sheet as well as saving rolls.
Cooling bed with gentle stream of water, coiler , coil carrier assembly, edge trimmer, packaging, engraving and weighing equipment
Cut-to-length line (CTLL) equipped with the straightener device, edge trimmer, cut-to-length device, packaging, and engraving for the production of sheets with precise dimensions and measurements.
In comparison with the conventional methods, the sheet that exits from the casting enters directly in the shuttle and heats up to 1150 degrees centigrade. There is profound energy saving due to the obviation of cooling down and reheating of the slab. Furthermore, the low thickness of the slab, in comparison with the 200-m thickness of the conventional slabs, saves rolling costs significantly due to low roll consumption.