NEW PLASTIC REFRACTORY LININGS FOR PROTECTING
A METAL STREAM DURING POURING INTO A CBCM
K. N. Vdovin,
V. V. Tochilkin,
O. A. Marochkin,
and V. I. Umnov
Translated from Novye Ogneupory, No. 7, pp. 41 – 43, July 2014.
Original article submitted January 27, 2014.
Construction of a lining with a collar is developed excluding reaction of molten steel with air during operation
of a section CBCM and makes it possible to provide rational parameters for feeding argon into a refractory
pipe annular recess. There is an improvement in pouring stability and poured metal quality.
Keywords: continuous billet casting machine (CBCM) protective pipe, nozzle-collector, protective lining,
In spite of extensive application of plastic and other
chemical synthesis products steel continues to remain the
main structural material. The value of steel is due to its uni-
versality, making it possible to create numerous mechanical
and other properties, geometric shapes, and object dimen-
sions. Nonetheless, with all of the achievements of steel it is
necessary to improve steadily finished product quality. A so-
lution of this problem is provision of a nitrogen content of
0.004 – 0.007% for different grades of electric steel.
In a CBCM reaction of molten metal with air mainly oc
curs in the section of the steel-pouring ladle – tundish
(Fig. 1). The area has three zones. In zones 0–0and 2–2
molten steel surface is protected by special covering materi
als (slag-forming and heat-insulating mixes) preventing mol
ten steel reaction with air. Zone 1–1includes refractory ele
ments (Fig. 2): a nozzle-collector 1, closely set in the bottom
of a steel-pouring ladle; a protective tube 2 with an opening
for argon supply into the inner circular cavity; a special lin
ing 3 made of ductile refractory .
During passage of a steel stream in the area of the
steel-pouring ladle–tundish there is erosion of refractory ele
ments in zone 1–1 due to occurrence of a gap, through which
air penetrates into the internal cavity of protective tube. The
thickness of the gap may be determined from formation con
ditions: with thermal expansion of a quartz protective tube,
with burning of a plastic refractory lining, and as a result re-
fractory object erosion.
Thermal expansion of a quartz protective tube is gov-
erned by the LTEC:
l = l
(1 + at ), (1)
where l is specimen length after action of temperature; l
specimen initial length; a is LTEC; t is specimen tempera-
In calculating thermal expansion over the inner diameter
of a protective tube in it upper part Eq. (1) takes the form
Refractories and Industrial Ceramics Vol. 55, No. 4, November, 2014
1083-4877/14/05504-0318 © 2014 Springer Science+Business Media New York
FGBOU VPO G. I. Nosov Magnitogorsk State Technical Univer
sity, Magnitogorsk, Russia.
FGBOU VPO Irkutsk State Technical University, Irkutsk, Russia.
Fig. 1. Zones of nitrogen and molten steel reaction in the section of
a steel-pouring ladle (I ) – tundish (II ).