Selection of Materials in The Oxidation Process Caused By Vapors From the Granulation of Metal Slag From the Blast Furnace

Objective: This study aims to evaluate the mechanical behavior and corrosion resistance of coated and uncoated steels, aiming at a longer use of the equipment and metal structures of a blast furnace exposed to specific corrosive environments. Theoretical Framework: The slag cooling process generates many gases and vapors with various chemical components that contribute to equipment corrosion. Identifying these corrosive agents is important for preventing corrosion and extending the useful life of industrial assets. Method: The work was developed with a selection of steels by applicability and by resistance to oxidation and temperature, the test specimens in triplicate were placed in two locations, the dry pit, and the silo, over 35 days with mapping of the environment, calculation of mass loss and x-ray diffraction. Results and Discussion: The results demonstrate the behavior of the specimens and the corrosion rates over time. The agents iron oxides (Fe2O3) and calcium carbonate (CaCO3) had a greater mass loss in ASTM A-36 steel, with a value of 9.1446±3.6503 mm/year in the dry pit. The AISI 310S steel had the lowest mass loss, with a value of 0.0014±0.0004 mm/year in the silo. Originality/Value: This study contributes to the literature in understanding the corrosive process of slag granulations from a blast furnace. The relevance and value of this research are evidenced by the gain in knowledge of the oxidation mechanisms of the medium, enabling the use of materials and control methods.