BOTTOM BLOWING TUYERES FOR 175-TON STEEL LADLES
IN SERVICE AT AN OPEN-HEARTH FURNACE SHOP (MISW JSC)
S. P. Lobanov,
V. G. Ovsyannikov,
G. A. Voronov,
and A. V. Sarychev
Translated from Novye Ogneupory, No. 1, pp.9–11,January, 2005.
Original article submitted November 30, 2004.
Test results for porous and slotted blowing tuyeres for 175-ton steel-teeming ladles in service at an
open-hearth furnace shop (MISW JSC) are reported.
Since 2003, comprehensive modernization has been un
der way at an open-hearth furnace shop, Magnitigorsk Iron
and Steel Works (MISW) JSC, aimed at the changeover to
advanced metallurgical technologies — extra-furnace treat-
ment of steel in the steel ladle of a ladle furnace and steel
teeming using continuous casting machines (CCM).
Currently, two 175-ton double-bath steel-making units
are in service at the MISW open-hearth furnace shop. The
metal is tapped out into steel-teeming ladles equipped with
two bottom blowing facilities through which an inert gas is
injected. The gas blowing makes it possible to minimize the
content of nonmetallic inclusions (subsequently removed by
flotation), to establish a uniform temperature field, and to
provide conditions for an optimal distribution of alloying el
ements and additives. The molten metal is poured out in
molds, or a CCM is used for that purpose.
Therefore several types of blowing facilities available
from domestic manufacturers were tested. They differed in
the chemical composition of refractory materials used and in
the number and arrangement of blowing slots. The major
suppliers were Dinur JSC (Pervouralsk) and Terg-K Re
search and Production Enterprise (Chelyabinsk). Blowing
tuyeres available from the Dinur JSC were fabricated by the
vibrocasting method using low-cement thixotropic castables
of corundum-spinel composition; these materials display suf
ficient mechanical strength, high thermal stability, low po
rosity, and good resistance to attack by molten metal and
slag. The tuyeres available from the Terg-K RPE were fabri
cated by the conventional technology (press-molding +
In 2003 – 2004, two types of blowing facilities were
tested: porous tuyeres and tuyeres with directional channel
porosity (slotted tuyeres). Sketch designs of these tuyeres are
shown in Fig. 1.
Porous tuyeres have found application in the production
of high-purity alloyed steels. Four sets of porous tuyeres
were fabricated to be tested for their utility in the
open-hearth furnace technology. The porous blowing tuyere
was housed within a metallic shell and fitted tightly into a
nested block (Fig. 1a ). The physicomechanical characteris-
tics of porous tuyeres are given in Table 1.
The bottom blowing tuyeres were tested on a double-
bath steel melting unit, a steel refining unit (SRU), and a la
Refractories and Industrial Ceramics Vol. 46, No. 2, 2005
1083-4877/05/4602-0085 © 2005 Springer Science+Business Media, Inc.
Magnitogorsk Iron and Steel Works (MISW) Joint-Stock Co.,
Fig. 1. Schematic diagrams of the blowing tuyeres tested: a ) slotted
tuyere; b ) tuyere assembled from ceramic plates; c ) slotted tuyere;
1 ) working section; 2 ) working section (gauged plates); 3 ) slot
channels; 4 ) vertical gas channels.