caa a22 4500 46322163X CHVBK 20180405153214.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1482-9 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1482-9 Hot corrosion mechanism of tundish plaster with steel slags in continuous casting [Elektronische Daten] [B. Moshtaghioun, Ahmad Monshi] This study concerns the chemical reactions involved and the phases formed during penetration of slags of variable composition into porous plaster structure of tundish. Tundish plaster is mainly composed of MgO with minor amounts of SiO2 and impurities, with a grain size of less than 1mm, inorganic or organic fibers in order to decrease density and provide porosity for insulation, plasticizers and stiffening agents and some other additions. Tundish slag analysis for different grades of steel (7176D and 1191D, according to DIN standard) at different sequences, indicated a very variable composition of CaO (11-42%), SiO2 (28-46%), Al2O3 (6-12%), MgO (11-20%), MnO (0-13%) and some minor variations of Fe, FeO and TiO2. Experimental work indicated that slag when penetrated into pores of plaster, develop the phases of Monticellite (CaO·MgO·SiO2) and Merwinite (CaO1.5·MgO0.5·SiO2) around MgO particles and decrease the liquidus temperature from 2,800°C to about 1,500°C and provide dissolution of MgO grains in steel making process. Calculation based on two kinetic equations developed for diffusion controlled dissolution, indicated that the dissolution of MgO in tundish plaster is not a diffusion controlled process and is affected by turbulent flow parameters. Phase diagram of CaO-SiO2-MgO indicates that decreasing SiO2 to below 20% and increasing CaO content to as high as possible, increases the liquidus temperature to above 2,000°C. Sources of SiO2 in the process are the rice husk addition, which is used as an insulating material on top of the melt, and the slag flux addition. These sources should be reduced to as low a level as possible. This fact does not affect the fluidity of slag which is required for inclusion removal. Fluidity of slag comes from low melting point eutectics in CaO-Fe2O3 and CaO-FeO (about 1,200°C) due to iron oxide on top of the steel melt. Springer Science+Business Media, LLC, 2007 Moshtaghioun B. Department of Materials Engineering, Isfahan University of Technology (IUT), 84156, Isfahan, Iran aut Monshi Ahmad Department of Materials Engineering, Isfahan University of Technology (IUT), 84156, Isfahan, Iran aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/16(2007-08-01), 6720-6728 0022-2461 42:16<6720 2007 42 10853 https://doi.org/10.1007/s10853-006-1482-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1482-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Moshtaghioun B. Department of Materials Engineering, Isfahan University of Technology (IUT), 84156, Isfahan, Iran aut NATIONALLICENCE 700 1- Monshi Ahmad Department of Materials Engineering, Isfahan University of Technology (IUT), 84156, Isfahan, Iran aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/16(2007-08-01), 6720-6728 0022-2461 42:16<6720 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer