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.
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 DCR||Offline DCR|
|Materials||CQ, T1, T2, T2.5, T3,|
T4, T5, DR7M, DR8,
|T1, T2, T2.5, T3-T5,|
EDDQ, CQ, DQ
|Strip width||700 - 1,280 mm|
|Strip thickness||Entry: 0.15 - 0.55 mm|
Exit: 0.12 - 0.55 mm
|Entry: 0.15 - 0.55 mm|
Exit: 0.12 - 1.00 mm
|Rolling speed||max. 1,100 m/min.||max. 1,800 m/min.|
|Capacity||436,500 t/y||420,000 t/y|