Vessel for metallurgical purposes

Details Vessel for metallurgical purposes Vessel for metallurgical purposes

1999-08-05

2000-08-29

Kastler, Scott

Metallurgical apparatus

Means for melting or vaporizing metal or treating liquefied...

Bessemer-type treating vessel

266275, 266280, C21C 550

Patent

active

061104140

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a vessel for metallurgical purposes, for transporting molten metals.


DISCUSSION OF THE PRIOR ART

Vessels of this nature are used not only to transport molten metals, such as for example pig iron, from the blast furnace to the pig iron mixer or from the pig iron mixer to the converter, but may also be a metallurgical treatment vessel. In particular, as the demands imposed on the level of purity increase and the levels of dissolved gases are reduced, vacuum treatment has become increasingly important. In this method, the thermal load on the treatment vessel is particularly high, since the process involves a high overheating temperature.
To solve this problem, a vessel for metallurgical purposes has been proposed (DE 195 38 530 C1) in which, in contrast to the conventional design, the reinforcement rings are not welded onto the outside of the circumferential surface, but rather are integrated in the metal casing. Furthermore, the plate which supports the vessel bearing lugs is at a short distance from the metal casing, the upper and lower peripheral areas, which are of rim-like design, of the plate are connected to the adjoining reinforcement rings. The vessel bearing lug which is attached to the plate only extends outward. With regard to the thickness of the reinforcement rings, the thickness of the reinforcement ring which is closer to the base is greater by a factor of up to 4, and the thickness of the second reinforcement ring, which lies further away from the base, is greater by a factor of up to 6, than the thickness of the adjoining metal casing, the axial extent of the first reinforcement ring being greater than or equal to that of the second. If the vessel is being used as a steel-casting ladle, the vessel edge is connected to a lid attachment, which is preferably frustoconical in cross section. The arrangement of a further reinforcement ring at the edge of the vessel is provided for in order to reinforce this area.
This known vessel, when subjected to combined load and heat stress, is stressed uniformly and is able to withstand being heated to a temperature of up to 400.degree. C. A drawback of this design is that the weld joints between the reinforcement rings and the plate are exposed to high levels of load and the transition from the reinforcement ring to the plate is unfavorable in terms of its lines of force.


SUMMARY OF THE INVENTION

Starting from the known vessel, the object of the invention is to improve the design in such a way that the above-mentioned drawbacks are avoided and production of the vessel is simplified.
The essential novel modification to the design which is known per se relates to the design of the reinforcement rings in the area of the plate, which is designed as a shield segment. Both reinforcement rings have an extension in the form of a projection, one extension being directed upward and the other being directed downward. The shield segment is welded in between the two extensions. In this way, the connecting weld seams are placed in a zone which is subject to lower loads, so that the fatigue strength of this area is increased. Secondly, the transition from the reinforcement ring to the shield segment is highly rounded, this rounding continuing in the shield segment. This type of design improves the lines of force so that a virtually isotensoid design is produced. The particular shape and position of the two reinforcement rings, in conjunction with the shield segment, makes it possible to dispense with the reinforcement ring arranged on the vessel edge which is otherwise customary. Even in the case of vessels without an annular cover, the vessel is strong enough in the upper peripheral area for the arrangement of a boundary angle plate to be sufficient.
A further feature relates to the nature of the connection between the vessel bearing lug and the shield segment. In contrast to the known prior art, the bearing lug is not welded onto a plate, but rather is welded into a hole in the shield segment. In order also to

REFERENCES:
patent: 909655 (1909-01-01), Palmer
patent: 1861946 (1932-06-01), Wilhelmi
patent: 2165066 (1939-07-01), Needham et al.

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