Determining the powder thickness – measuring the true steel level in closed casting

In the production of high-quality steel alloys, closed casting plays a decisive role. During this process, the molten steel is covered by a layer of casting powder that prevents oxidation, slows surface cooling, and acts as a lubricant between the oscillating copper mould and the steel.
Traditional radiometric mould level detectors, however, cannot distinguish between the molten steel level and the powder layer — a challenge that can compromise accuracy and process control.

Innovation through partnership

Together with SMS Concast, Berthold Technologies has developed the LB 6755 CONGAUGE detector — a breakthrough solution for true level measurement in closed casting.
The device combines ten scintillation crystals with an advanced software algorithm, enabling precise differentiation between the molten steel surface and the casting powder thickness — all within a single measuring unit.

Maximum process reliability

Knowing the exact powder layer thickness allows operators to monitor the real liquid steel level with exceptional precision. This ensures:

• Automated, accurate dosing of casting powder via a feeder system

• Reduced manual intervention in hazardous areas

• Consistent powder layer and stable mould conditions

The LB 6755 CONGAUGE uses silicon photomultiplier (SiPM) technology for outstanding resistance to interference from electromagnetic stirrers and brakes, combined with superior temperature stability.

Benefits for steel producers

Accurate measurement and control of powder thickness offer clear process advantages:
■ Fewer strand breakages
■ Higher mould level stability
■ Improved steel quality
■ Full process automation through feeder integration

Advantages of Berthold’s powder layer measurement technology

■ Dual signal detection – steel and powder in one unit
■ Consistently high steel quality
■ Reliable under extreme process conditions
■ Low maintenance requirements
■ Easy retrofit of LB 6752 and LB 6652 systems without mechanical modifications
■ Robust against electromagnetic fields, heat, and vibration

For more information, visit: www.berthold.com/powder-thickness

Source and Photo: Berthold