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Sommaire du brevet 1070476 

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  • lorsque le brevet est émis (délivrance).
(12) Brevet: (11) CA 1070476
(21) Numéro de la demande: 275631
(54) Titre français: CUVES METALLURGIQUES
(54) Titre anglais: METALLURGICAL VESSELS
Statut: Périmé
Données bibliographiques
Abrégés

Abrégé anglais




ABSTRACT OF THE DISCLOSURE
A tundish is described which consists of an outer
metal casing with a base of generally arcuate section and
generally upstanding sidewalls, a permanent lining of re-
fractory material located adjacent the sidewalls and the
base of the casing, and an inner expendable lining of
refractory heat insulating material located adjacent the
permanent lining. The inner expendable lining is made
up of a plurality of elongate slabs having a flexible cen-
tral portion and two end portions, the central portion
being deformed to fit the generally arcuate base and the
two end portions being located adjacent the tundish side-
walls. The impact area of the tundish is lined with a
highly erosion-resistant or sacrificial material.


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Revendications

Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.


The embodiments of the invention, in which an
exclusive privilege or property is claimed, are defined
as follows:
1. In a tundish comprising an outer metal casing formed
of a base of generally arcuate section and generally upstan-
ding sidewalls, the impact area of the tundish being lined
with a material selected from the class consisting of highly
erosion-resistant and sacrificial materials, a permanent
lining of refractory material located adjacent the sidewalls
and the base of the casing, and an inner expendable lining
of refractory heat insulating material located adjacent the
permanent lining, the improvement which comprises forming
the inner expendable lining of a plurality of elongate slabs
having a flexible central portion and two end portions, the
central portion being deformed to fit the generally arcuate
base and the two end portions being located adjacent the
tundish sidewalls.

2. The tundish of claim 1 wherein the central portion
of each slab is formulated from fibre-containing refractory
heat insulating material of inherent flexibility.

3. The tundish of claim 1 wherein the central portion
of each lining slab is made up of a plurality of transverse
sections extending across the slab connected together by
reduced thickness portions to give the slab an ability to
fold.

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4. The tundish of claim 1 wherein the central portion
of each slab is made up of a plurality of transverse sec-
tions connected together by a reinforcement.
5. The tundish of claim 4 wherein the reinforcement
in each section is an internal wire mesh.


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Description

Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.


1C~7~ 4 7 ~

The invention relates to metallurgical vessels ofthe type used in continuous casting of steel and known as
tundishes.
British Patent Speci~ication 1,364,655 describes a
tundish having an outer metal casing ~nA a permanent
lining of refractory material ad~acent the casing and
an expendable lining made up of a set of slabs of re-
fractory heat insulating material, the impact area of
the tundish being lined with highly erosion resistant
or sacriiicial materlal, The tundish there disclosed
has a generally flat base lined with refractory bricks
upon which is super$mposed a lining of slabs as de-
fined. Nozzle wells are set into the base and these
are also lined in such a way as to leave the nozzle
ltself open.
Certain tundishes have curved bases and for these
it is not readily possible to use slabs as disclosed
in the ~ritish Speclflcatlon noted unless they are
~ccurately cut to size which is time-consuming and ex-

. .
pensive. Cur~ed slab~ can be manufactured, albeitwith difflculties. However~ in order to make curved
slabs, curved formers are needed, made to close toler-
ances. In practice, these neYer fit the curve of
the tundish lining exactly, especially once the latter
i~ not new, which can lead to fitting difficulties
and brea~ages. m e present ~n~ention concerns an

. 'i1
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.

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107047~j -

alternati~e and superior way of lining the floor of such
a tundish.
According to the present in~ention there is provi-
ded a tundish comprising an outer metal casing formed
of a base of generally arcuate section and generally
upstanding ~idewalls, the impact area of the tundish
being lined with a highly erosion-resistant or a
sacrificial material, a permanent lining of refractory
material being located ad~acent the sidewalls and the
base of the casing, an inner expendable lining of
refractory heat-insulating material being located
ad~acent the permanent lining, wherein the inner expen-
dable lining is made up of a plurality of elongate
slabs hau~ga ~lexible central portion and two end
portions, ths central portion being deformed to fit
the generally arcuate base and the two end portions
being located ad~acent the tundish sidewalls.
me reguired degree of n exibility of the central
portion Or each slab can be obtained by suitably for-
mulating the composition of which the lining is made,
but this may be un~atisfactory from the point of view
of the performance of the lining material. Flexibi-
lity can be conferred by suitably formulating the
composition used to make the lining to include suitable
organic and/or inorganic fibres, e.g. asbestos, cal-
cium silicate, and alum~nium silicate fi~res, paper

-- 3 --

` 1Cr7~ 47

fibres and wood pulp.
Preferably, however, the central portion of the
slab is made up of a plurality of trans~erse sections
extendlng across the slab and either connected to-
gether by thin webs of the material of the slab so
giving the slab an ability to fold or connected to-
gether by a suitable internal or external reinforce-
ment. A particularly preferred type of slab is one
in which the centrsl area comprises a plural1ty of
transverse slabs of re~ractory heat insulating
material ~oined to each other and to the end portions
of the slab by an internal wire mesh reinforcement.
The use of such slabs to line tundishes is ad-
vantageous as it makes for rapid and easily carried
out lining installation with a minimum of ~oins to
be sealed agalnst metal penetration; the gaps between
the slabs close up when the lining slab i8 put into
position, The ease and speed Or installing the
expendable lining of the lnvention is highly advan-
tageous and leads to substantial steelwork~ economies.
An embodiment oi the invention is illustrated
in the accompanying diagrammatic drawings, in which
Figure 1 is a tran~verse sectional view oi a
tundish incorporating an expendable l~n~ng;
Figure 2 i3 an end ele~ation o~ a llning slab
for use in the tundish o~ F~gure 1, and

.
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., .
:;


'
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1070~76

Figure 3 is a sectional view of Figure 1 showing
the slab during its insertion into the tundish.
me tundish shown in the Figures comprises an
outer metal casing 1 comprising integrally formed
opposite sidewall~ 2 Joined by an arcuate base 3.
Reinforci~g flanges 4 are located on the outside of
the casing, together with lifting hooks and like parts,
not shown. The side walls and base of the casing
are lined with a permanent refractory lining 5,
formed of one or more layers of refractory brick or
cast retractory concrete,
An expendable lining comprise~ a row of rela-
tively flexible heat-insulating slabs 6, one of which
is shown in Figure 2. The slab is formed o~ a
composition comprising, parts by weight
silica sand 87.5
paper 3.0
urea formaldehyde resin 2.5
phenol formaldehyde resin 2.0
asbestos fibre 5.0
by making an aqueous slurry of the ingredients and
then dewatering that slurry by pressure or vacuum
ag~inst a perforate former of a suitable shape. In
forming the slab a web 7 of wire mesh is located with-
in the thickness of the slab and grooves 8 are formed
in one face in the longitudinal central area of the

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1(~7047~i

slab and extending from the face of the slab towards
the mesh. The presence of the groo~es 8 ensures that
the central part of the slab may be ~lexed while the
presence of the mesh tends to prevent such flexure
from rupturing the slab.
The slab 6 is preferably 30 mm thick and its
length will depend on the dimensions of the tundish
into which it is to be fitted. Pre~erably for a
slab ~0 mm thick the grooves 8, which generally will
be of -V- cross-sectional shape, extend into the
thickness to a depth o~ about 14 mm. The slab formed
from the composition specified above will be a rela-
tively high heat-insulating reiractory material having
a relatively low heat capaclty.
In use, a slab 6 i8 taken from the flat condi-
tion shown in Figure 2, folded longitudinally into
generally -U- ehape and is then inserted into the
tundi~h to line the permanent lining 5~ The folded
lining is then urged lnto tight engagement with the
permanent lining 5 and where necessary any gaps are
sealed by a re~ractory mortar, AS the slab bends
to take up its final position, the V-section grooves
close up and accordingly a~ter the slab is installed,
these grooves do not provtde areas of possible metal
penetration. It will be appreciated that some o~
the slab3 6 rill overlio ~ornatlons in the tundigh



,

.,

1070476
wall~ e.g. nozzles, pouring pad, and apertures may be
made in those slabs for such formations, either during
forming or by cutting out from a formed slab.
The presence of slab 6 enables one to achieve
in relation to tundishes having an arcuate base, the
advantages listed in British Patent Specification
1,364,655 for flat base tundishes~

Dessin représentatif

Désolé, le dessin représentatatif concernant le document de brevet no 1070476 est introuvable.

États administratifs

Pour une meilleure compréhension de l'état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , États administratifs , Taxes périodiques et Historique des paiements devraient être consultées.

États administratifs

Titre Date
Date de délivrance prévu 1980-01-29
(45) Délivré 1980-01-29
Expiré 1997-01-29

Historique d'abandonnement

Il n'y a pas d'historique d'abandonnement

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Description du
Document 
Date
(yyyy-mm-dd) 
Nombre de pages   Taille de l'image (Ko) 
Description 1994-03-25 6 197
Dessins 1994-03-25 1 19
Revendications 1994-03-25 2 53
Abrégé 1994-03-25 1 24
Page couverture 1994-03-25 1 14