Investment decision in integrated steel plants under uncertainty

Steel is an alloy composed of iron and carbon for which there are two main large-scale production processes: using iron ore and coal as raw materials through a method known as integrated plants with blast furnaces and using iron scrap melted in electrical furnaces, also known as mini-mills or semi-integrated plants. The production in integrated plants typically implies greater investment, but is more cost-competitive as it provides greater economies of scale. The disadvantage of this method is that the furnaces basically need to work almost continuously through their life span, thus reducing the flexibility of production adjustment to market demands. To attenuate this problem, huge investments in lamination assets are commonly made, generating the possibility of production diversification and valuable switch options. This work values an output switch option in a hypothetical integrated steel plant composed of a blast furnace and a hot laminator. Results show that this option can generate a significant increase in the NPV of blast furnace plants. Results also emphasize the importance of correctly choosing the stochastic process for the underlying uncertainty and the effect it may have on the switch option value. ► Investment decisions in steel plants are taken in an uncertain environment. ► Investment in lamination assets enables production of different steel products. ► This work values a product switch option output in a hypothetical steel plant. ► Results show that this option can increase the NPV of blast furnace plants. ► Choice of stochastic process of steel prices model is important for option value.