Dispensing – Molten metal dispensing – With subjacent flow guide
Patent
1989-09-19
1994-05-24
Kastler, Scott
Dispensing
Molten metal dispensing
With subjacent flow guide
222591, 164337, B22D 4150
Patent
active
053140990
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a casting spout for metallurgical vessels particularly for a tundish arranged upstream of a mold for continuous casting and more particularly to a casting spout fastened to such a tundish, for purposes of casting thin ingots, the spout is assumed to have an upper portion of tubular shaft configuration and lower portion which widens conically in downward direction.
The basic body of such a casting spout is comprised of alumina or clay material mixed with graphite and being highly wear resistant with respect to liquid steel and the graphite component is protected against burn-off or going in solution with the steel. Discharge pipes constructed as casting spouts for so-called slab ingots whose cross sections have dimensions of about 300 mm by 2600 mm. These discharge pipes require a particularly suitable geometric configuration concerning casting throughput. The so called jumbo casting spouts have an internal cross section for maintaining the desired throughput which is so large that any alumina deposits will have no reducing effect on the casting speed. For smaller mold cross sections e.g. cross sections (having a width of for example 50 mm,) the dimensions necessarily have to be reduced and consequently the flow cross section for such a casting spout is reduced accordingly.
It is known through German patent 21 05 881 to reduce the inflow speed from the casting spout into the mold for continuous casting and in casting direction through a conically widened discharge pipe configuration and to make uniform that flow in the cross section of the mold. Such a discharge pipe is however preferred only for small or medium casting configurations and smaller slab ingots with dimensions such as 350.times.250 mm or 1000.times.300 mm.
DESCRIPTION OF THE INVENTION
It is an object of the present invention to provide a casting spout of the kind referred to above such that on continuous casting flat slab ingots of large width, a favorable distribution of flow into the mold is attainable for high casting throughput.
This objective is attained in accordance with the invention through the following features the casting spout widens in down direction conically in one plane only and is narrow in a plane transverse to the one plane, and that a still lower portion below the conical arm offers a lengthwise cross-section that extends over its height with an outlet zone having a length width ratio from 20:1 to 80:1.
The inventive casting spout makes it possible for the given length to width ratio of 20:1 to 80:1 to maintain the previous casting throughput but now also for very narrow continuous casting molds. Another advantage is to be seen in the cooperation with a smooth wall for the molds for continuous casting having low manufacturing cost.
A favorable distribution of flow is moreover attained in that the upper portion in cross section is round and that the lower long portion is rectangular whereby between the two sections there is provided the conical transition.
Further improvements of the invention provide that the wall thickness of the lower spout portion is at the most 10 mm. Another improvement of the invention provides that the lower spout portion is at least partially made of a fireproof, thermostock resisting material which is also resistant against casting powder slag while the main components are ZrO with additives or graphite and/or silicon carbide and/or boron nitride and/or a high melting metal and/or a high melting metal compound.
A feature concerning the professional manufacturing of the discharge pipe is to be seen in that the upper portion and the lower portion can be manufactured by means of partitionable core segments. In particular, extremely narrow lower casting spout portions have a throughflow opening that is correspondingly narrow and may be as narrow as 10 mm or less. For this purpose one will preferably establish a hollow space by means of combined core segments, which space is configured preferably in a manner that favors flow conditions.
In the case of wall thickness of about
REFERENCES:
patent: 3991815 (1976-11-01), Fastner et al.
patent: 4210264 (1980-07-01), Kondo
patent: 4220618 (1980-09-01), Pierson, Sr. et al.
patent: 4852633 (1989-08-01), Teshima et al.
patent: 4904626 (1990-02-01), Shaffer
l
Butz Hans
Diederich Gerd
Ehrenberg Hans-Juergen
Lohse Dietmar
Parschat Lothar
Kastler Scott
Mannesmann AG
Siegemund Ralf H.
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