Investigation of high temperature oxidation of low-alloy steel

Purpose: This paper presents results of investigates the formation of scales in the temperature range from 1000°C to 1300°C in the oxidation atmosphere without deformation process. Design/methodology/approach: Oxidized samples were examined by means of EDX Analysis using SEM. Findings: It was found that the oxidation temperature influences the occurrence of the Si-rich phase (Fayalite). Fayalite formed only in the samples oxidized at 1300°C and 1250°C. Oxidation temperatures of 1000°C led to formation of scale enriched with chromium, silicon and nickel in the metal/oxide interface without formation of a new phase. Research limitations/implications: In this study the oxidation behavior in a rotary hearth furnace, which has low oxygen content, is investigated. Furthermore, the formation of scale in high oxygen content (dry air) was explored. Originality/value: The descaling process during the hot rolling of steel alloyed with Si is difficult due to pockmark type surface. Therefore the surfaces quality of the hot rolled products depends on the formation and removal of scales during the production process.