MODERN HIGH-TEMPERATURE THERMAL INSULATION
FOR STEEL-POURING LADLES
V. A. Kononov
and I. I. Zemskov
Translated from Novye Ogneupory, No. 5, pp. 20 – 25, May, 2012.
Original article submitted April 18, 2012.
This article examines aspects of the thermal insulation of small steel-pouring ladles with the use of
periclase-carbon products in the working layer of the lining. Modern thermal insulation must be used for se
vere service conditions. It is proposed that mullite-silica board and panels based on fibrous materials with a
high service temperature be used for this purpose. Their use makes it possible to not only conserve thermal re
sources, but also prolong the service life of the metal shell of steel-pouring ladles.
Keywords: high-temperature thermal insulation, heat-insulating board and panels, protective cover, stand for
heating linings, temperature field.
The service conditions of steel-pouring ladles have be-
come considerably more severe in recent years because the
introduction of alloying additions, out-of-furnace treatments
of the steel, the injection of inert gases, and other operations
have been transferred from the steelmaking furnace (electric
furnace, open-hearth furnace) to the ladle. The length of time
that aggressive molten steel is in the ladle has increased sev
eral-fold, which has heightened the melt’s effect on the lin
ing. A new class of periclase-carbon refractories has been in
troduced in ladle metallurgy, and these materials have not
only made it possible to satisfy the demanding conditions for
casting steel but have also proven very durable (>100 heats).
A conventional modern lining for a steel-pouring ladle con
sists of three layers composed of different classes of
– a working layer made up of periclase-carbon products
with an MgO content of 90 – 98%;
– a reinforcing layer comprised of high-alumina materi
als (70 – 83% Al
– a heat-insulating layer formed with modern fibrous
Figure 1 presents a diagram of a modern lining for
steel-pouring lades. The lining is designed with allowance
for the local effects of the molten steel and slag. For exam
ple, a refractory that is resistant to aggressive slag is chosen
Refractories and Industrial Ceramics Vol. 53, No. 3, September, 2012
1083-4877/12/05303-0151 © 2012 Springer Science+Business Media New York
”Shiber” Company, Moscow, Russia.
OOO “Teplopromproekt”, Moscow, Russia.
Fig. 1. Lining of steel-pouring ladle: 1) protective cover; 2) slag
zone; 3) walls; 4) bottom; 5) reinforcing layer; 6) heat-insulating
layer; 7) injection lance; 8) well block; 9) starting mixture;
10) steel-pouring nozzle; 11) slide-gate slab; 12) nozzle-collector.