The Calderys cast-in-situ and precast QD (Quick Dry) solutions installed at our German customer’s plant allowed them to optimise the performance of their steel ladles with a focus on the lip ring zone.
The destruction of the ladle lip zone during the production process or during the cleaning of the top ladle ring with an excavator machine creates a risk of disassembling the slag line (made of MgO-C bricks) so there is a clear need to avoid safety incidents.
It is important to find a solution for optimising performance with a material allowing a good compromise between thermal shock, corrosion, and mechanical resistance, while also allowing for a heating-up of the ladle that does not need to be slowed during preheating.
Calderys has developed a new generation of CALDE® CAST QD (Quick Dry) materials, which do not contain cement and allow to significantly reduce preheating by reducing dry-out and heating-up time by 50% vs. standard cement-containing materials.
The key benefits which convinced our existing customers in Germany to choose QD refractory materials:
- Ease of installation
- Fast heating-up rate
- Good general performance
CALDE® CAST NA 55 QD (andalusite based) and CALDE® CAST NB 82 QD (bauxite based) are particularly well-adapted for the lip ring zone for standard processing.
In case of heavy corrosion like with a vacuum tank degasser, CALDE® CAST NT 92 QD (tabular alumina based) is recommended.
Top stresses successfully confronted at the steel ladle lip:
- Splashing during tapping of steel from the converter and consequent deposits of steel scrap
- Corrosion from slag during the secondary metallurgy process
- High thermo-mechanical stresses from the thermal expansion of the refractory wall
- High mechanical stress during cleaning with a machine
For more details, please contact our Steel experts!