Two separate rolling mills are employed to process the raw steel blooms into rebars and high-quality steel bars to be used in the automotive industry or in machine construction. To this end, the blooms are once again heated up in a pusher-type or in a walking-beam furnace respectively prior to hot-rolling into the size requested by the customer.
Rolling mill I – Rebars
In the first rolling mill the manufacturing of rebars takes place. The blooms, coming directly from the casting machine in order to reduce power consumption, are heated up to rolling temperature in a pusher-type furnace. In the final rolling stand the typical ribs and the registered LSW logo are rolled in by a calibrated gauge. After reduction the hardened strand ends its run on a rake-type cooling bed for tempering. Immediately after this last step it is cut to length and the resulting bars are bundled up.
- methane-heated pusher-type furnace for hot and cold use
- 18 rolling stands in continuous order
- controlled cooling from rolling temperature using the Thermex process
rake-type cooling bed, cold shears, automatic bundling system.
Rolling mill II - High-quality and special steel bars
In the second rolling mill high-quality and special steel bars are manufactured whose subsequent further processing takes place mainly in the automotive industry or in machine construction. Here the blooms are heated up to a temperature ranging from 1150 to 1200 °C in a walking-beam furnace. After high-pressure descaling they are hot-rolled into the size requested by the customer. High precision laser measurements check that the prescribed size tolerances are not exceeded. The hot-rolled bars are finally laid on the rollover cooling bed to guarantee a controlled cooling.
- Rolling mill for steel bars and billets
- Methane-heated walking-beam furnace, 16 two-high-stands in semi-continuous order
- Rake-type cooling bed, hot-cutting machine and bundling system for steel bars
Hot-cutting machine and rollover cooling bed for steel billets
- Normalising rolling process
- In-process checks: size monitoring using laser optics