Patent EP0620062B1 successfully refreshed from Google Patents.
EP0620062B1
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EP
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Process for continuous casting of metals using a hot top, and method used therefor
Assignee: Unimetal SA
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Filing: 1994-03-28
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Granted: 1998-06-03
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Expires: 2014-03-28
Abstract
Abstract The (ingot) mould according to the invention is provided with a thermo-insulating hot top (2) made from rigid refractory material implanted on the tube element made from chilled copper (1) and means (8, 18, 12, 12, 13, 10) are provided for injecting, through the wall, a pressurised gas which emerges in the casting space 3 in the form of anular jets (streams) which cut through any solidification skin (crust) already formed by the cast metal (4) in contact with the refractory hot top (2). The invention makes it possible to distance the meniscus (7) from the solidification front of the cast metal in the copper element by eliminating the risks of incipient solidification between the two. <IMAGE>
Inventors
- 👤 Eric Perrin
- 👤 Jacques Spiquel
- 👤 Jean-Marc Jolivet
- 👤 Jacques Legoff
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:51
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/04; B22D11/0401
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
Process for the continuous casting of molten
metals, especially steel, in a vertical or curved mould,
comprising an intensely cooled tubular metal element (1)
defining a passage (3) for the cast metal (4) and
intended to initiate, upon contact with it, the solidification
(15) of the cast metal, in which process a
thermally insulating pouring bush (2) is placed on the
said element (1), which pouring bush extends the said
passage upwards and is made of a rigid refractory in
order to be capable of containing the cast molten metal
and on which are likely to form spurious solidifying
skins (14), characterized in that a gas is injected level
with this pouring bush, or at least at its base, this gas
emerging as jets distributed annularly at the surface of
the pouring bush (2) into the passage (3) for the cast
metal (4) so as to obtain a shearing effect of the said
spurious solidifying skins (14).
Claim 2
Dependent Claim
23 words
Process according to Claim 1, characterized in
that a gas which is chemically inert with respect to the
cast molten metal is used.
Claim 3
Dependent Claim
40 words
Process according to Claim 1, characterized in
that the said gas is injected under an outlet pressure at
the surface of the pouring bush which is at least 20%
greater than the ferrostatic pressure at the point of the
outlet.
Claim 4
Dependent Claim
24 words
Process according to Claim 1, characterized in
that a lubricant is injected into the said passage (3)
through the said tubular metal element (1).
Claim 5
Dependent Claim
120 words
Vertical or curved mould for the continuous
casting of molten metals, especially steel, comprising: an intensely cooled tubular metal element (1)
defining a passage (3) for the cast product (4) and
intended to cause, upon contact with it, the start of the
solidification (15) of the cast metal, a pouring bush (2) made of a rigid refractory
having thermally insulating properties, which is fitted
directly on the tubular element (1), extending it
upwards, characterized in that the mould furthermore
includes means (8, 13, 12, 10) for injecting a gas under
pressure through the wall of the mould, which gas emerges
as jets distributed annularly at the surface of the said
pouring bush into the passage (3) for the cast metal.
Claim 6
Dependent Claim
32 words
Mould according to Claim 5, characterized in that
the said injection means comprise a single slot (8) made
at the interface between the pouring bush (2) and the
cooled metal element (1).
Claim 7
Dependent Claim
21 words
Mould according to Claim 5, characterized in that
the said injection means comprise staged slots made in
the pouring bush (2).
Claim 8
Dependent Claim
24 words
Mould according to Claim 6 or 7, characterized in
that the slots have a thickness of from one to three
tenths of a millimetre.
Claim 9
Dependent Claim
25 words
Mould according to Claim 6 or 7, characterized in
that the said slots are continuous annular slots all
around the perimeter of the pouring bush.
Claim 10
Dependent Claim
33 words
Mould according to Claim 5, characterized in that
the thermally insulating refractory pouring bush (2) is
made of a mixture of alumina and silica in respective
proportions of 90 and 10% by weight.
Claim 11
Dependent Claim
75 words
Mould according to Claim 5, characterized in that
the injection means furthermore comprise a box (10),
provided with a pressurized-gas inlet pipe (11) and
mounted in a sealed manner (17) around the pouring bush
(2) and of which the external surface (16) of the said
pouring bush constitutes a wall of the box and is
provided with means (12, 13, 8, 18) for conducting the
gas from the box right into the casting space (3).
References Cited (Backward Citations)
No citation records indexed.
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