 |
 |
ABS is equipped with two melting lines. The older (EAF) consists of a 90 ton electric arc furnace, placed in a dog-house (for noise containment and for fumes suction and abatement). The new (Danarc) consists of a 100 ton electric arc furnace.
The melting process is fed by charges of scrap selected on the basis of the NFA cards (Norma Fabbricazione Acciaieria, that is the steelworks making standard) coded according to the various steel grades. The addition of additives and
ferroalloys is performed by automated plants connected
to the process monitoring supervision system, which
constantly keeps under control all the production parameters (technical, metallurgical and about consumption).
Depending on the different cycles, production can be completed
with refining process outside the Melting Furnace and with
vacuum degassing in order to guarantee particularly low hydrogen
content. At the end of the melting phase, after check of correspondence with metallurgical parameters, the liquid steel is directed to the Casting
Lines.
| MELTING FURNACES |
| EAF, Tagliaferri
(revamped by DANIELI in 1991) |
|
|
|
| Type
of Furnace: |
three-phase alternate current (AC) |
| Rated capacity: |
90
ton |
| Transformer: |
65 MVA |
| Furnace dia : |
5.4 m |
| Tapping system: |
siphon |
|
|
|
|
|
| DANARC Plus
M2 (DANIELI 1998) |
|
|
|
| Type
of Furnace: |
direct
current (DC) |
| Rated capacity: |
100
ton |
| Transformer: |
103 MVA |
| Furnace dia : |
5.8 m |
| Tapping system: |
EBT |
|
|
|
|
|
|
| REFINING FURNACES |
| LF1
(DANIELI in 1991) |
|
|
|
| Transformer: |
18 MVA |
| Heating capacity: |
5° C/min |
| Ladle dia : |
3 m |
| Electrodes dia : |
350 mm |
| Bubbling system: |
Argon |
|
|
|
|
|
| LF2 (DANIELI 1999) |
|
|
|
| Transformer: |
33 MVA |
| Heating capacity: |
6° C/min |
| Ladle dia : |
3 m |
| Electrodes dia : |
350 mm |
| Bubbling system: |
Argon |
|
|
|
|
|
|
| DEGASSING |
| VD 1
(DANIELI in 1991) |
|
|
|
| Dia: |
5.5 m |
| Height: |
6.6 m |
| Volume: |
250 m³ |
| Liquid ring pumps: |
2 |
| Air ejectors : |
4 in series - 1 in parallel |
| Wire inoculation system : |
5 automatic lines |
|
|
|
|
|
| VD 2 (DANIELI 1999) |
|
|
|
| Dia: |
5.5 m |
| Height: |
6.8 m |
| Volume: |
270 m³ |
| Liquid ring pumps: |
2+1 |
| Air ejectors : |
4 in series - 2 in parallel |
| Wire inoculation system : |
6 automatic lines |
|
|
|
|
|
|
