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Shougang Jingtang United Iron & Steel, China: inline and offline DCR mills

DCR mills for continuous and batch operations

In 2011, Shougang Jingtang Iron & Steel ordered an annealing line with an integrated inline DCR mill and an additional offline DCR mill for their works on Caofeidian Island. Both the 4-high mills have been operating since 2013.

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Arrangement of the inline DCR mill in the exit of the annealing line.

Inline DCR mill
Suitable for both wet and dry skin-passing, the twin-stand inline DCR mill adjusts the mechanical and technological strip properties. It rolls the strip with reductions of up to 42 percent and applies a specified roughness to the strip surface. To ensure continuous operation, a push-through mode is implemented for work roll changeover. Finally, after passing through the DCR mill, the strip is air-dried.

Offline DCR mill
Furthermore, SMS group supplied a twin-stand offline DCR mill for the discontinuous production of tinplate in a second production route. Downstream from a batch annealing furnace, carbon steel strip is skin-passed down to gages of as little as 1.00 millimeters. Here again, 42 percent reductions are possible and the mill ensures the required strip surface roughness.

Main technical data

Inline DCROffline DCR
MaterialsCQ, T1, T2, T2.5, T3,
T4, T5, DR7M, DR8,
DR9, DR10
T1, T2, T2.5, T3-T5,
DR7-DR10, DDQ,
Strip width700 - 1,280 mm
Strip thicknessEntry: 0.15 - 0.55 mm
Exit: 0.12 - 0.55 mm
Entry: 0.15 - 0.55 mm
Exit: 0.12 - 1.00 mm
Rolling speedmax. 1,100 m/min.max. 1,800 m/min.
Capacity436,500 t/y420,000 t/y
Technical features
  • CVC®plus
  • Work roll bending
  • Multizone cooling
  • DS System
  • CVC®plus
  • Work roll bending
  • Multizone cooling
  • DS System
  • Automatic work roll change
  • Semi-automatic backup roll change
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Entry-side view of the offline DCR. In the foreground: coil handling equipment