Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
1998-11-06
2001-04-17
Lin, Kuang Y. (Department: 1722)
Metal founding
Process
Shaping liquid metal against a forming surface
C029S081010, C072S039000
Reexamination Certificate
active
06216770
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of improving the surface quality of a continuously cast slab, particularly a thin slab having a maximum cast thickness of 100 mm, wherein the slab is covered with a casting slag film and a layer of scale, and wherein the slab is descaled after casting and is rolled in a finishing train.
2. Description of the Related Art
After rolling thin slabs in a finishing train, the rolled hot strip very frequently has stripes or streaks on its surface. In many types of later applications of the hot strips, these stripes can be tolerated. However, when the quality requirements are particularly high, these stripes or streaks cannot be tolerated. Therefore, in these types of applications, thick slabs having a cast thickness of at least 150 mm are still being used. However, this is comparatively expensive and cumbersome.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a method of improving the surface quality of the continuously cast slab in which stripes and streaks no longer occur on the surface or are at least significantly reduced, so that thin slabs can also be used as the initial material for applications with high quality requirements.
In accordance with the present invention, a reaction agent, which is different from water, is applied onto the slab prior to descaling or during descaling.
The application of the reaction agent may be preceded by a conventional hydraulic, mechanical or pneumatic removal of the layer of scale which covers the slab.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
REFERENCES:
patent: 5131126 (1992-07-01), Katsuki et al.
patent: 5964275 (1999-10-01), Flick et al.
patent: 53-5031 (1978-01-01), None
patent: 54-58630 (1979-05-01), None
patent: 56-9001 (1981-01-01), None
patent: 57-70019 (1982-04-01), None
patent: 59-28578 (1984-02-01), None
patent: 5-17888 (1993-01-01), None
patent: 5-25666 (1993-02-01), None
Hensger Karl-Ernst
Kolakowski Manfred
Rintoul David J.
Schuster Ingo
Kueffner Friedrich
Lin Kuang Y.
SMS Schloemann--Siemag Aktiengesellschaft
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