《ECCC-58连铸超低碳钢中Ti和P对水口堵塞影响的研究》.pdf

Formation of non metallic compounds in the solidification processes Session 17 1 Investigating the influence of Ti and P on the clogging of ULC steels in the continuous casting process 1 2 1 * 2 2 Authors : C. Bernhard , G. Xia , A. Karasangabo , M. Egger , and A. Pissenberger 1) M²CC, Chair of Metallurgy, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria 2) voestalpine Stahl GmbH, Voestalpine-Straße 3, 4020 Linz, Austria Abstract In the casting of Ti-bearing ULC steels, clogging of the submerged entry nozzle (SEN) affects both the productivity of the caster and the quality of cast products. The plant experience shows a negative influence of increasing Ti and P contents on the clogging tendency of ULC steel grades. Analytical investigations on samples from the process and laboratory experiments have been carried out in order to gain a better understanding of the influence of Ti and P on the clogging phenomenon of ULC steel grades. After casting Ti and P alloyed ULC steels, the deposits from clogged SEN have been analysed. The results indicate that the particles consist mainly of alumina (Al O 90 mass%), while the Ti content makes up only a very small 2 3 portion (0.58 – 3.58 mass%). An automated inclusion analysis by OES-PDA shows that the size of oxide inclusions decreases with increasing Ti content. The determination of the influence of Ti and P solutes on the wetting in the liquid Fe/Al O system by the sessile drop method indicates that both ele