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Distribution of boron between oxide slag and steel

Content Provider	Springer Nature Link
Author	Sychev, A. V. Salina, V. A. Babenko, A. A. Zhuchkov, V. I.
Copyright Year	2017
Abstract	The influence of silicon (0.1–0.8%), aluminum (0.005%), and carbon (0.1%) in steel on the reduction of boron from slag (basicity 5) at 1400–1700°C is studied by thermodynamic analysis on the basis of HSC 6.1 Chemistry software (Outokumpu). Experiments on the boron distribution between CaO–SiO$_{2}$–MgO–Al$_{2}$O$_{3}$–B$_{2}$O$_{3}$ slag and steel are conducted in a high-temperature Tamman resistance furnace. Low-carbon steel with different silicon content is employed. According to the thermodynamic modeling and the experiments, direct microalloying of steel with boron is possible on the basis of its reduction by the silicon present in the steel. The reduction of boron from slag by silicon is theoretically analyzed and experimentally confirmed. The results of thermodynamic modeling indicate that boron may be reduced from CaO–SiO$_{2}$–MgO–Al$_{2}$O$_{3}$–B$_{2}$O$_{3}$ slag by silicon despite its low content in the steel (0.1–0.8%). With increase in the initial Si content in the steel, the boron concentration in the steel also increases. The influence of the Si content and the steel temperature on the final boron content is studied. When steel is held under slag containing 4.3% B$_{2}$O$_{3}$, the boron is reduced, mainly by silicon, whose content in the steel is 15–22% lower after the experiment. More boron is present in the steel sample with an elevated Si content. The degree of assimilation of boron is 5.8–6.9%; this is consistent with the thermodynamic modeling. The boron content in the metal may be regulated by adjusting the temperature and the silicon content of the steel. On the basis of the results, a technology for the direct microalloying of steel with boron may be developed.
Starting Page	105
Ending Page	107
Page Count	3
File Format	PDF
ISSN	09670912
Journal	Steel in Translation
Volume Number	47
Issue Number	2
e-ISSN	19350988
Language	English
Publisher	Allerton Press
Publisher Date	2017-05-26
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	steel slag boron thermodynamic modeling experiments phase distribution of boron direct alloying Materials Science
Content Type	Text
Resource Type	Article
Subject	Materials Science

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