RSD
Residual Steel Detection
Safe Tundish Drain with Residual Steel Detection
RSD 300
The RSD 300 measuring system is specifically designed for use in tundishes on continuous casting lines in steelworks to monitor low steel levels. It is used where the existing tundish scale is inadequate for accurately measuring the remaining steel quantity.
Key Purposes for Accurate Steel Level Measurement
- Emptying as completely as possible without slag carryover, ensuring maximum discharge
- Optimizing steel grade changes due to minimized mixing zones
- Maximizing strand length for efficient casting
- Closing the tundish at the optimum steel level, allowing for easy removal of the cooled skull
- Enabling automatic closure at the end of the sequence for improved operational efficiency
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Your contact partner
Dipl.-Ing. Benjamin Ruf
Technical Sales Manager
Pierre Bacher
Technical Sales Manager
The benefits
Reliable
The electromagnetic measuring principle combined with the fully digital signal transmission and a well protected sensor installation on the tundish bottom below the permanent lining raise the system to a new level of relialbility.
Safe
Due to the exact determination of the height of the residual steel in the tundish the steel level can be safely lowered closer to the critical threshhold without risking slag transfer into the mold.
Reproducible
The RSD system directly measures the distance of the steel/slag interface, providing a much higher precision compared to indirect weight-based measurements.
Efficient and cost-effective
Draining your tundish with RSD leads to significantly lower steel levels resulting in maximized yield at sequence end and minimzed mixing zones during grade changes.
01
Maximized Yield
By using the RSD, tundish skulls are minimized at the end of the sequence through optimized tundish drainage, ensuring the steel level is lowered just above the critical height where slag carryover becomes possible.
02
Less Downgrading
Minimizing residual steel levels during a grade change reduces mixing zones, resulting in less downgrading and higher profitability.
03
Safety
There is no risk of uncontrolled tundish emptying, which could lead to slag carryover into the mold and create hazardous situations.
Measurement and Working Principle
The sensor contains a transmitting coil and a receiving coil. The transmitting coil generates an alternating electromagnetic field that causes eddy currents in the liquid steel. These eddy currents affect the voltage induced in the receiving coil. As soon as slag enters the measuring range of the sensor, the eddy currents change and consequently the induced voltage. The RSD measuring system records these voltage changes and uses them to calculate the remaining height of steel in the tundish.
The sensor is installed on the tundish steel shell at the bottom, securely protected from direct contact with molten metal by the refractory lining. As the steel/slag boundary layer enters the RSD sensor’s measuring field—within a range of 0 to 20 cm above the refractory lining—the system detects the remaining steel height in the tundish based on a characteristic signal curve.
When the predefined critical level is reached, just before slag flow occurs into the mold, the RSD system triggers an alarm. This signal is used to close the tundish via a stopper, preventing slag transfer.
