Abstract
A new smelting technology for IIIX15CΓ-B electrosteel is described. In this technology, the steel undergoes treatment in a ladle-furnace unit and a vacuum system. The output of bar batches of all five size groups is analyzed for the content of nonmetallic inclusions according to State Standard GOST 801-78 and the ASTM E-45 standard (method A). The phase-mineral composition of furnace slag on smelting steel in a DSP-60 arc furnace is studied by X-ray microstructural analysis. The change in chemical composition of oxide-fluoride slag when the steel passes through the ladle-furnace unit and the vacuum system is analyzed, along with the influence of CaF2 on the activity of FeO in oxide-fluoride slag and on the durability of the ladle lining. In conclusion, the need for environmental improvements is noted, in the light of the use of fluorspar; research into means of reducing fluorspar consumption must be activated.
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