Molten material is either poured into cast iron moulds (INGOTS) or into sand moulds (CASTINGS). A considerable proportion of the ingot production of carbon and low-alloy steel with the highest claims for quality of material is intended for the Forge Shop.
The steel works can produce bottom-poured ingots up to the size I 195 (200 t) poured in controlled Ar atmosphere.
The raw materials for steel production include steel scrap, selected recyclable waste, various grades of pig iron and alloying additions. Crude steel is first smelted in an electric arc furnace and subsequently refined in the ASEA ladle (a duplex process). This method makes it possible to attain the following limits of impurities:
|phosphorus||max. 0.007% |
|sulphur||max. 0.005% (0.002%) |
|hydrogen||max. 1.0 ppm |
|oxygen||max. 25 ppm |
|nitrogen ||max. 50 ppm |