(1) Overview

1700 double-stand skin passing unit is two four-high tandem rolling mill, using German Siemag double skin passing process. It is mainly used for flat tinning raw plate and sheet and super thin sheet less than 1.0mm, and for secondary cold rolling production. The main task is to eliminate the yield platform of the very thin strip steel after cold rolling and annealing, and improve the subsequent forming performance, plate shape and surface quality. The main rolling mill adopts hydraulic pressing, with electric auxiliary pressure adjustment. After the transformation in 1998, the DC transmission adopts AEG company's ISA-D system, and the corresponding LOG system is hydraulic. The auxiliary drive is all controlled by PLC except for the pump control in the 2# oil depot. The PLC adopts Quantum series PLC. The annual design output is 120,000 tons.

The 1700 double-stand skin passing unit was put into production in 1978 and discontinued in December 2013.

(2) Process and equipment description

Strip thickness:

General plate: 0.15-0.8mm

Tin plate: 0.15-0.5mm

Strip width:

Common plate: 550-1270mm

Tin plate: 550-1100mm

Inner diameter of steel coil:

Common plate: 450-610mm

Tin plate: 450mm

Steel coil outer diameter:

Common plate: 900-1850mm

Tin plate: 800-1800mm

Coil weight:

General plate: 12-25 tons

Tinplate: less than 20 tons

Maximum rolling speed: 2000m/min

Maximum rolling pressure: 1800KN

Annual rolling capacity: 275,000 tons