Global Steel Wire – iron and steel company
CelsaGroup CelsaBarcelona


Manufacturing Process


Rolling mill

The process begins with entry of the 180-mm cross section square billets with a weight varying from 2500 to 3250 kg, heated in a water-cooled walking beam furnace with a capacity of 170 t/hour, with bottom and top heating. Once heated, they are rolled in a 4-pass blooming mill, a mill with one horizontal/vertical channel, down to 140-mm square crosssection billets.

These billets are kept hot in a pusher furnace arranged to continue the rolling in a continuous wire rod mill with two strands. The first 11 passes are common, and starting from the intermediate mill, the two rolling strands are separated with a total of 4 knot twist shapers.

Line for diameters from 5.5 mm to 24 mm:

The steel goes to the preparation and intermediate mill, with nodular cast rollers. The last 18 passes are made with tungsten carbide rollers in 3 mini-blocks with a no-twist, 8 passes finisher blocks with automatic cropping shears at the entry, and finally the 4-pass Reducing Sizing Mill (RSM).

Having the RSM enables the adjustment of the roundness tolerance to +/- 0.10 mm, manufacturing diameters from 5.5 mm to 24 mm and rolling at speeds of 105 m/s.

Before and after the RSM, we have entry and exit cross-section control systems that use laser heads. Likewise, we have Eddy Current equipment for surface control of defects along the length of the coil.

Subsequently, the wire rod is subjected to a cooling process controlled by water and air, ?Stelmor Optifl ex High Capacity?. Optionally, the retarded cooling system can be used. The entire cooling process is controlled continuously in a closed computer loop.

Coils are shaped vertically with an orbital lap distribution system.

Line for diameters from 22 to 52 mm:

A line connected to a ?Garret? type intermediate mill. It has water boxes for rolling at a temperature of up to 850o C, automatic cropping and sampling shears, a Bar Reducing Sizing Mill for obtaining a roundness tolerance of +/-0.10 mm, the Garret winder itself, fans for cooling the coils, a walking beam conveyor and a transfer car for connecting the coils to the compacting machines.

This production line also has two diameter metering units that use lasers and continuous defect control by Eddy Current.

Finally, the coils coming from the two lines are compacted by 40 t presses and automatically fastened using four, 6.5-mm diameter wire rod ties.

Poligono Industrial Nueva Montaña S/N, 39011 Santander, Cantabria   -   Phone +34 942 200 200   -   Fax +34 942 200 252
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