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Along with coal and limestone, the primary concentrate (ironsand) is heated and dried in one of four multi-hearth furnaces. It is then fed into the four reduction kilns, where it is converted to 80% metallic iron. Two melters then convert this into molten iron. The iron, at around 1480°C, is transferred to the Vanadium Recovery Unit (VRU), where vanadium-rich slag is recovered for export and further processing into a steel strengthening additive. The Ironmaking Plant at Glenbrook has the capacity to produce 650,000 tonnes of molten iron.

Molten iron is a key ingredient in the steelmaking process which takes place in the Slabmaking Plant. This Plant consists of an oxygen steelmaking furnace (KOBM) and a continuous slab casting machine. To produce steel, the KOBM uses a mixture of scrap steel and molten iron from the melters. Further refining occurs at the Ladle Treatment Station (LTS), where ferro-alloys are added to bring the steel composition up to its required specification. The molten steel from the LTS is then transferred to the continuous caster, where it is cast into slabs.

The slabs cool outside before being reheated in the reheat furnace. The slab (210 mm thick and weighing over 10 tonnes) is then transferred into the reversing rougher mill and is reduced in thickness with each pass. The steel is rolled down to about 25 mm when it is coiled in the coil box (to retain heat). It then passes through the finishing mills to achieve its final thickness. The steel is water cooled and coiled ready for further processing.