JPS58103942A - Mold for continuous casting of platelike ingot - Google Patents

Abstract

PURPOSE:To facilitate parting of ingots by providing pinnaclelike or wedgelike projecting lines by which notches deeper than specific depth are obtained on the short sides of the ingot after casting respectively in the transverse central parts on the short sides on both sides of the inside walls of a mold. CONSTITUTION:Projecting lines 4, 4' having pinnaclelike or wedgelike cross sections in such a way that >=3mm. notched parts 8, 8' are obtained on the short sides 5 of an ingot after casting are provided respectively in the central parts of the inside walls 3, 3' on the short sides of the inside wall of a mold 1. Laminar segregation 6 exists in the central part in a platelike ingot 5 cast by such mold 1. If the ingot 5 is parted along the segregation 6, the ingot is easily parted and the clean surfaces are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention solves the problem of segregation formed inside a slab obtained by continuous casting by cutting the slab to expose it to the outside of the slab and producing a slab with an internally clean surface. Regarding the technology to obtain.

magma, which attempts to expose the outer MK and obtain a clean inner steel slab by dividing the segregation found in the center of the slab obtained by continuous casting, *For example, % 41'S 1982 This is disclosed in Japanese Patent No.-27104. This is related to OJl construction of small square steel pieces, and the segregated areas are crushed by rolling after casting to form the outer periphery, and the steel pieces are divided into two pieces.

However, in the case of small rectangular steel slabs, the above method can solve the problem, but when the cross-sectional shape of the slab is essentially a long rectangle, the above means cannot be practically applied. This relates to the technique of cutting two slabs along the segregated area found in a thin layer at the center of the thickness direction*, and provides the shape of the casting mold as a preliminary measure to make the cutting smooth. It is something.

Sunawa! ), the gist of which is that for continuous casting INK of Fi plate-shaped slabs, a notch depth of at least 43 mm can be obtained at the width center 111 of both short sides of the inner wall of the hook part on the short sides of the slab at the casting ridge. In some cases, a tower-shaped or horizontal protrusion was provided.

This will be explained in detail below using illustrated examples.

Figure 1 is a conceptual diagram of the accelerated mold according to the present invention, where 1 is power saving, 2. 2' is the inner wall on the long side, a, s' Fi is the inner wall on the short side, Tos, and Tos on the short side on both sides. Protrusions 4, 4' in the center
is provided.

The wcz diagram shows a cross-sectional view of a plate-shaped slab 5 cast by the mold IK, and a layered segregation 6 remains in the center of the plate. f7 (, both short sides 7.7'Kti of the slab 5 are formed by the projections 4, 4', and a nine notch 8.8' is located in the center of the short side 7.7I.

That is, the surface where the brittle segregation 6 is located and the notch 8.degree. 8' are created in a state in which it is easy to break the slab, which will be described later, and is an aggregate existing on the same surface.

For the above reasons, the protrusions 4, 4' for forming the notches 8, 8' have a spire-like or horizontal shape, and their sieves are HF.
From the viewpoint of the purpose, the larger the diameter, the more advantageous it is, but if it is too large, the resistance during casting will be large and breakage and wear will be severe. Therefore, in practice, a diameter of about 7 to 15 mm is selected, but for purposes of use, at least 43 mm must be ensured, and this protrusion must be provided continuously over the entire length in the height direction of the mold.

In the post-processing of the SFi slab cast using the mold according to the present invention and containing nine nozzles, it is driven by known means, for example, as shown in FIG. The cutting mechanism 10 and 10' are used for cutting into 10' rubs.

In addition, when inserting the notch into the slab 5, another way of thinking is 1. For example, as disclosed in JP-A No. 51-83023, etc., after the plate-shaped slab is cast, a rolling roll with protrusions is used. There is a technique to create grooves for cutting. However, this method divides the plate-shaped slab into two parts in the width direction, that is, the long press side. Due to the structure of the continuous casting machine, it is not possible to make a notch on the short side of a slab-like slab using a rolling roll method, and even if it were done, the shape of the roll surface would be too deep and have a sharp tip. Not possible due to restrictions.

The present invention is not only suitable for manufacturing steel materials that require a high degree of homogeneity, but also can be expected to have the following effects.

(1) To reduce the slab thickness by half, making it possible to reduce the fuel consumption rate during reheating in the hot rolling process.

(Rolling using public hot rolling KII) Rolling productivity can be dramatically improved because the number of mills can be reduced.

(3) The ninth rolling yield, which maintains a good shape during rolling, is improved.

(4) II! i VCill! It is possible to omit the intensive desulfurization and degassing processes that were conventionally employed mainly to prevent hydrogen defects in steel materials that do not require uniformity of i l.

(5) First, in the method of forced cooling of steel plates after rolling, which has been rapidly implemented in the steel industry in recent years, intensive degassing treatment is required, but this is no longer necessary.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of a mold according to the present invention, Fig. 3 is a cross-sectional view of a slab cast by casting 11 of Fig. 1, and Fig. 8 is a rear ball of a slab cast by casting 11 of the present invention. It is a reference diagram showing the state of cutting processing in sK. The parts shown in each figure are as follows. 1---Electricity saving, 4---Protrusion, 5---Slab, 6---Engagement part, 8---Notch part. Replacement patent attorney Masaaki Akizawa Mitsuyuki 2 people

Claims (1)

[Claims] (1) At the center of the width of both short sides of the inner wall of the cast iron, protrusions with a tower-like or horizontal cross section are installed so that a notch depth of at least 3 mm is obtained in each short piece after casting. Energy saving for continuous casting of plate-shaped slabs.