Mainstrip Twin Roll Casting

Mainstrip

Efficient Twin Roll Casting
Low Cost, Low Energy, Low CO2

Mainstrip Production Potential

Operating Window
Roll Diameter
Process Potential

Operating Window

For the formation of the desired steel strip, imposed constraints of the process are to be recognized.

Mainstrip Production Potential, Operating Window

Example Case 1m diameter roll,
1250mm wide

Imposed physical constraints:

  1. Casting speed < 30 m/min
  2. Cast thickness < 1 mm
  3. Casting speed > 120 m/min
  4. Cast thickness > 3 mm
  5. Copper sleeve temperature > 350 °C
  6. Heat flux < 5 MW/m2

The “window” diagram shows an example case for 1 m diameter roll, 1250 wide, imposed by the physical constraints. The volume can be changed by different roll diameter and casting width.

Casting Roll Diameter

The maximum realistic potential output depends on the cast strip thickness and roll diameter.

Mainstrip Production Potential, Casting Roll Diameter

The “window” diagram shows an example case for 1 m diameter roll, 1250 wide, imposed by the physical constraints. The volume can be changed by different roll diameter and casting width.

The shown potential is based on a casting width of 1250 mm. Production increases with strip width.

Smaller casting roll diameters offer thinner strip at lower volume.

Large rolls are operating at relatively low heat extraction to the maximum possible. Therefore large roll developments have significant strategic opportunities to lift casting output and offer a better geometry between the rolls for crystallization.

The maximum realistic production rate potential increases with the roll diameter.

Future Process Potential

Twin Roll Casting on the base of the Mainstrip Concept has substantial potential to increase the production in future, by enlarging the casting width of up to 3 m and over. Such a solution allows matching converter cycles. The costs of metal delivery (submerged entry nozzles) and side dams in this way decrease. The strip width can be slit to the order book. The yield is to increase substantially.

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