Stock material or miscellaneous articles – All metal or with adjacent metals – Surface feature
Patent
1991-09-11
1993-07-13
Lin, Kuang Y.
Stock material or miscellaneous articles
All metal or with adjacent metals
Surface feature
164480, 164428, B23P 900
Patent
active
052272516
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thin continuous cast plate manufactured through the use of a casting apparatus, such as a movable casting mold, for example, a twin drum system wherein use is made of a pair of cooling drums equipped with an internal cooling mechanism, a single drum system wherein use is made of a single cooling drum, or a drum-belt system wherein a pouring basin is formed between a cooling drum and a belt.
BACKGROUND ART
In recent years, in the field of continuous casting of a metal, various proposals have been made describing a technique for casting a thin cast plate having a thickness (2 to 10 mm) close to that of a final article by means of a continuous casting apparatus wherein use is made of a cooling drum provided with an internal cooling mechanism for the purpose of reducing the production cost and creating a new material.
In the above-described casting techniques, it is important to stably maintain the surface appearance of a cast plate on a high level. For this reason, proposals have been made on a casting technique wherein casting is conducted in the presence of an inert gas atmosphere for the purpose of preventing the formation of scum in a pouring basin (see Japanese Unexamined Patent Publication (Kokai) No. 62-130749), a roll brush technique wherein an oxide or the like deposited on the surface of a cooling drum is removed for the purpose of uniformly forming a solidified shell by means of a cooling drum (see Japanese Unexamined Patent Publication (Kokai) No. 62-176650), a technique as another means for achieving uniform formation of a solidified shell wherein a number of dimples are provided on the peripheral surface of a cooling drum so as to form an air gap serving as a heat insulating layer between the cooling drum and a solidifying shell (see Japanese Unexamined Patent Publication (Kokai) No. 60-184449), and other techniques.
Even in the above-described conventional casting techniques, it was difficult to stably prepare a cast plate having good surface appearance, and longitudinal and transversal cracks often occurred.
DISCLOSURE OF INVENTION
Under the above-described circumstances, an object of the present invention is to prevent the occurrence of cracking on the surface of a cast plate through the positive provision of a predetermined pattern on the surface of a cast plate as opposed to the prior art wherein the surface of the cast plate is made as even as possible. More specifically, an object of the present invention is to provide a cast plate having a tortoise shell pattern surrounded by a dimple on the surface of a thin continuous cast plate.
Another object of the present invention is to provide a process for producing said cast plate by means of a movable casting mold.
The present inventors have made various studies and, as a result, have found that the formation of a tortoise shell pattern having a circle equivalent diameter of 5 to 200 mm surrounded by a dimple having a depth of 5 to 30 .mu.m on the surface of a cast plate is very effective for preventing the occurrence of surface cracking of the cast plate.
Further, the present inventors have proved that the above-described object can be attained by a casting process wherein the overheating temperature, .DELTA.T, of a molten metal poured into a pouring basin of a casting mold of a movable mold type continuous casting machine is regulated to 15.degree. C. or below as a means for forming the above-described pattern.
The term"circle equivalent" used herein is intended to mean a value obtained by converting the area A surrounded by a groove of a closed curve to the circle area .pi.d.sup.2 / 4 (d=.sqroot.4A/.pi.).
Further, the term "tortoise shell pattern" is intended to means an irregular pattern substantially surrounded by a dimple.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a diagram showing the relationship between the overheating temperature, .DELTA.T (.degree. C.), of a molten metal within a pouring basin and the dimple depth (.mu.m) of the tortoise shell pattern;
FIG. 2 is a diagram sh
Suichi Isao
Tanaka Shigenori
Lin Kuang Y.
Nippon Steel Corporation
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