The roof of electric arc furnaces for steel smelting (EAF) are exposed to very demanding operational conditions and its service life is shorter than that of the other parts of the lining. The durability of the roof can be improved by modifying its design.Compared with the sector-arch type of roof currently used on most electric arc furnaces, the advantages of a roof of annular masonry are as follows: more uniform distribution of the stresses in the crown, significantly lower labor intensity and time consumption in the laying of the masonry, more scope for efficient intermediate cold patching, and the need for fewer different types of brick.The types of brick produced to the correct dimensions for the annular masonry of roof of the 100-ton EAFs of the Chelyabinsk Metallurgical Plant were the magnesite --chromite (periclase-spinel) types MKhS (PShS)-40, MKhS (PShS)-41, and MKhS (PShS)-42, and the magnesite --chromite types MKhS-41, MKhS-42, and MKhS-43 ( Fig. 1 and TaMe 1).Bricks Nos. 40 and 41 (see Fig. 1A) were intended for the construction of the annular masonry by laying them on their edges (relative to the roof ring), bricks No. 42 for the construction of the annular masonry by laying them on their fiats (see Fig. 1B), and on their edges in conjunction with bricks No. 41 (see Fig. 1C), and bricks No. 43 (see Fig. 1D and E) for the construction of the circular electrode openingsand the annular center part of the roof.In 1973-1974 the Magnezit Combine produced three experimental batches of these bricks. The first batch was produced in magnesia brick Section No. 2 (MBS-2) by the technology for periclase --spinel roof brick. The batch consisted of PShS-40 and PShS-42 types. The second and third batches were produced in MBS-1 by the technology for magnesite--chromite roof brick. The second batch consisted of MKhS-41, MKhS-42, and MKhS-43 types, and the third batch of MKhS-41 and MKhS-43 types.
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