Effect of Steel Composition on the Scale Layer Composition in Continuous Casting

Wang, Nan; Wen, Han; Huang, Weijun; Dou, Naiyuan; Chen, Min

doi:10.1002/9781118792148.ch92

Cited by 2 publications

(2 citation statements)

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“…Oxide scales usually reveal phases such as wüstite, magnetite, and hematite [5,6,9,25]. Wüstite (FeO) forms as a first layer closest to the substrate with the highest Fe concentration, while magnetite (Fe 3 O 4 ) forms as the second phase with a higher oxygen concentration than wüstite.…”

Section: Phases In Oxidesmentioning

confidence: 99%

“…Wüstite (FeO) forms as a first layer closest to the substrate with the highest Fe concentration, while magnetite (Fe 3 O 4 ) forms as the second phase with a higher oxygen concentration than wüstite. Finally, hematite (Fe 2 O 3 ) forms at the oxide/air interface controlled by the inward diffusion of oxygen, where the self-diffusion of iron and oxygen is slow [19][20][21][22][23][24][25][26]. The microstructure of oxides is also dependent on the alloying elements containing the steel.…”

Section: Phases In Oxidesmentioning

confidence: 99%

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Scale Formation on HSLA Steel during Continuous Casting Part I: The Effect of Temperature–Time on Oxidation Kinetics

Huitron

López

Vuorinen

et al. 2020

Metals

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The findings in this work enhance the understanding of oxidation mechanisms and scale growth at high temperatures of a high strength low alloy (HSLA) steel for improving surface quality during continuous casting. The oxidation phenomenon was investigated under dry air and water vapor atmospheres by heating specimens at 1000, 1100, and 1200 °C at different holding times. Temperature and time had great effects on the kinetics, where faster (i.e., parabolic) oxidation rates were present under water vapor when compared with the dry air condition. Temperature strongly influenced the number of defects, such as pores, voids, gaps and micro-cracks, formed in the oxide scale. A phase analysis confirmed the presence of FeO as the first phase formed at the steel surface, Fe3O4 as the middle and thicker phase, and Fe2O3 as the last phase formed in the oxide/air interface. The micromechanics of the oxides demonstrated that a combination of phases with high (wüstite) and low plasticity (magnetite and hematite) could also have been the reason for the uneven cooling during Continuous Casting (CC) that resulted in the undesired surface quality of the steel slabs. This work gives a good look at the oxide scale effect on the surface quality of steel slabs through an understanding the kinetics during oxidation.

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Section: Phases In Oxidesmentioning

confidence: 99%