Scrap is increasingly used as a raw material in the steel industry in response to the generation of large quantities of scrap in industrialized countries. This means that scrap is becoming an industrial product, which will be processed more and more by effective preparation equipment and which should be controlled for quality in terms of iron content, level in tramp elements and density following methods and standards under development.
Seven industrial dolorna refractory samples, coming from three European suppliers, and with different carbon, or graphite, or binder content, are subjected to the action of a slag required for the desulfurization of the steel in the secondary metallurgy at 1600 DC. Three tests have been carried out within two induction furnaces. The corrosion depth, at the slag-steel interface, has been measured; the graphite-containing samples display a better resistance than the graphite-free pitch or resin-bonded refractories. Among the graphite-containing samples correlations have been found with the carbon content and with the resistance to oxidation by CO-C0 2 at 1100-1200 DC. The slag-refractory interface has been investigated by X-ray diffraction, optical microscopy and electron microprobe analysis; the observed phases are CaO, MgO, Ca~i04, Ca3SiOs and Ca,2AI,4033 (outside graphite and iron). The corrosion mechanism is linked to the reaction of slag with lime, followed by infiltration of the refractory and dispersion of periclase grains in the slag.
Schlackenkorroslon vonDolomit-Kohlenstoff-Stelnen. Sieben industrielle Dolomit-Feuerfestproben mit verschiedenen e-, Graphitund Bindergehalten, die von drei europaischen Feuerfest-Herstellern stammten, wurden dem Angriff einer Schlacke, wie sie in der Sekundarrnetallurqie zur Stahlentschwefelung erforderlich ist, bei 1600 D C ausgesetzt. Drei Versuche wurden in zwei Induktionsoten durchgefOhrt. Die Korrosionstiefe an der Schlacke/Stahl-Grenzflache wurde gemessen. Graphithaltige Proben weisen einen besseren Widerstand auf als die graphitfreien teer-oder harzgebundenen Feuerfeststoffe. Bei den graphithaltigen Proben wurden Korrelationen mit dem C-Gehalt und dem Oxidationswiderstand gefunden. Die Grenztlache Schlacke/Feuerfest wurde mit Rontgenbeugung, Lichtmikroskopie und Mikrosondenanalyse untersucht. Die beobachteten Phasen waren CaO, MgO, Ca~i04' Ca3SiOs und Ca,2AI14033' Der Korrosionsmechanismus ist mit der Reaktion der Schlacke mit dem Kalk verbunden; weiterhin ist er abhi=i.ngig von der lmpraqnierunq des Feuerfestmaterials und der Verteilung der Perlklaskorner in der Schlacke. steel research 61 (1990) No. 12
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