Numerical Analysis of the Irreversible Behavior of Corundum Castable Purging Plugs During Service

Tan, Fangguan; Jin, Shengli; He, Zhu; Li, Yawei

doi:10.1007/s11837-021-04838-0

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…Purging plugs play a crucial role in secondary refining processes to produce highquality steel; their functions include facilitating reactions, discharging harmful gases, separating impurities from molten steel, and stirring the molten steel in steel ladles via flowing argon gas [1,2]. Unfortunately, the service life of purging plugs is dramatically shorter in comparison to that of steel ladle linings because of their severe working environment, including thermal stress derived from a larger temperature gradient, corrosion by slag and molten steel, and severe erosion wear by the oxygen cleaning process [3][4][5]. To meet the strict requirements, corundum-spinel castables containing Cr 2 O 3 have been widely used to fabricate purging plugs due to their impressive slag resistance and excellent hot strength [6], but their poor thermal shock resistance (TSR) results in thermal spalling and fracture, thereby reducing their service life [7].…”

Section: Introductionmentioning

confidence: 99%

Effects of Alumina Bubble Addition on the Properties of Corundum–Spinel Castables Containing Cr2O3

Chen,

Shi,

Chen

et al. 2024

Materials

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Purging plugs made of corundum–spinel castables containing Cr2O3 have been widely utilized in secondary refining process. However, their poor thermal shock resistance has greatly limited the improvement of their service life. Aiming to enhance their properties, we introduced alumina bubbles (ABs) to corundum–spinel castables, and the effects of the AB addition on the properties of the castables are studied in this manuscript. The results indicate that the apparent porosity, permanent linear change, cold strength, and hot strength all increased with an increasing AB amount. The thermal shock resistance of the samples with the AB addition was improved; the residual strength and residual strength ratio of the sample with 4 wt% ABs was the best. The effects of ABs on the tabular alumina aggregate distribution and relationship between the cold strength of the samples and the AB content was evaluated via the box dimension method. With the increments of AB content, the box dimension value of the tabular alumina within the samples significantly decreased, indicating that the tabular alumina aggregate distribution was related to the amount of ABs. In addition, the relationship between the box dimension and the strength was also established.

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