Optimization of Electromagnetic Parameters for the 3rd-generation FC MOLD
The No.8 caster of Benxi Steelmaking Plant is equipped with the 3rd Flow Control Mold （ hereafter abbreviated as FC MOLD G3）. In order to reduce inclusions in slabs， the steel plant used the standard deviation of liquid level fluctuation in the mold to evaluate the amplitude of liquid level fluctuat...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Special Steel
2025-02-01
|
| Series: | Teshugang |
| Subjects: | |
| Online Access: | https://www.specialsteeljournal.com/fileup/1003-8620/PDF/2024-00161.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The No.8 caster of Benxi Steelmaking Plant is equipped with the 3rd Flow Control Mold （ hereafter abbreviated as FC MOLD G3）. In order to reduce inclusions in slabs， the steel plant used the standard deviation of liquid level fluctuation in the mold to evaluate the amplitude of liquid level fluctuation， and used nail board test to detect the flow velocity of liquid level. Through industrial experiments， the operating parameters of FC MOLD G3 were optimized. After optimization， the parameters of the combined mode of stirring and braking are： upper DC current is 68% full current of upper coil， upper AC current is 26% full current of upper coil， and lower DC current is 48% full current of lower coil. The parameters for the high-speed braking mode are： upper DC current is 72% full current of upper coil， upper AC current is 12% full current of upper coil， and lower DC current is 100% full current of lower coil. The parameters for the wide section stirring mode are： upper DC current is 20% full current of upper coil， upper AC current is 25% full current of upper coil， and lower DC current is 0 A. The results showed that compared with not using FC MOLD G3， the liquid level fluctuation in mold decreased by 30%-35%. In the compound mode of stirring and braking， the precision of liquid level was controlled within ± 3 mm， exceeding 95%. The reasonable range of surface flow velocity of molten steel in the mold reached 80% in the range of 0.2 m/s-0.4 m/s. Moreover， the standard deviation of surface flow velocity in the mold decreased individually： it decreased by 64.1% in the standard stirring+braking mode， and it decreased by 12.8% in the high speed braking mode， and it decreased by 40% in the wide-section stirring mode.The results of the EM scan showed a 26% decrease in the number density of inclusions above 10 μ m in the surface layer of the slab. Industrial production practice shows that the degradation rate of cold rolled coil caused by inclusion defects also decreased by 25%-30%. |
|---|---|
| ISSN: | 1003-8620 |