SU1537355A1 - Continuously-cast ingot - Google Patents

Abstract

The invention relates to metallurgy, namely to continuous casting of metals. The aim of the invention is to increase the expenditure ratio of the metal in the production of thin slabs. The ingot contains the central part of a circular or regular polygonal section, to which thin cases, one above the other at an angle of less than 180 °, are poured by their narrow edges. At the same time, the intersection angles of the wide faces of two adjacent thin slabs are inside the central part of the ingot. 3 il.

Description

This invention relates to metallurgy, specifically to the continuous casting of metals.

The aim of the invention is to reduce the expenditure ratio of the metal in the production of thin slabs.

FIG. Figure 1 shows an ingot comprising a central part in the form of a circle and thin radial adjacent to it in the radial directions, cross section; in fig. 2 - the central part in the form of a square; in fig. 3 - thin layers with a stepwise change in thickness.

In accordance with FIG. 1, the central part 1 is circular. The thin layers 2 poured to it are oriented so that their planes of symmetry, parallel to their wide faces and crossing their narrow edges, pass through the center of the circle. The vertex of the intersection angle of the wide faces of two adjacent thin slabs is located inside the contour of the circle, near its center. Thin layers of 2 would be fan-shaped around the central part 1. There are 12 of them. The angle between the wide faces of the adjacent thin slabs is 30 °. Their wide faces are normal to the tangent to part 1 at the intersection points by the corresponding planes of symmetry.

With a thin slab thickness of 20 mm, a width of 1600 mm, the slab is intended for an immediate task in the finishing mill group of the 1700 wide-strip mill, mine is a draft group. In this case, based on the analysis of the possibility of a constructive solution of the block of molds, the diameter of the round thickened profile is assumed to be 190 mm.

Calculations by known methods show that the solidification time of a circle with a diameter of 190 mm is 13 minutes.

The solidification time of slab with a thickness of 20 mm is 7.15 s, i.e., at the rate of pulling of the ingot from the crystallizer, in the order of 2-2.5 m / min, the thin slab will completely solidify already in the crystallizer.

The flow rate of the molten metal along the crust in the crust of the thin slab during its formation does not depend on the speed of the ingot extraction from the crystallizer (so

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as with a change in speed, the depth of the channel accordingly varies) and according to calculations less than 0.45 m / s, which guarantees a steady flow of metal and, accordingly, the surface quality of the thin slab (fluid flow disturbances begin at speeds of the order of 5-6 m / s) .

An ingot consisting of the central part of a round profile with a diameter of 190 mm and thin slabs with a thickness of 20 mm and a width

The arrangement of thin slabs 2 with wide edges oriented normally to the edges of the central part corresponds to the shrinking directions of these faces.

It is possible to obtain 5 standard sizes of thin slabs of different thickness (Fig. 3). Three thin slabs 2 adjoin the central part 1 of the round shape in radial directions, and on the side of their narrow edges removed from the large-sized lead of 1600 mm, at casting speeds of 2-2.5 m / s l, even thinner ones adjoin them / min, is produced by pouring through a bottler 3, whose wide edges also

oriented in the same radial directions as in slab 2. The angle between the cup 50 mm in diameter at the height of the metal level in the tundish is about 500 mm.

do the broad faces of settled thin slabs 2 or 3 120 °.

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Due to the fact that the depth of the liquid phase of the thin slab is significantly less than the height of the mold (its height is usually about one meter), immediately after the ingot exit from the mold block, it is possible to separate the thin bar from the central part of the ingot section 20 parts, bending them (for example, by cooling one wide face and heating the other) and winding into rolls with appropriate winders, and further processing of the central part to lead as on curvilinear-type bar machines.

The proposed ingot ensuring the performance of the disagreement of the mass fraction of thin with discontinuous ingot during one expansion of the range of profiles

Claims (1)

Invention Formula 25 The continuous cast ingot, the immaterial part and the narrow edges adjoining them are characterized by the fact that, with the purpose of the expenditure ratio of metal thin slabs, the center of the ingot has in section Due to the fact that the speed of the task of the metal in the first stand of the finishing group A continuous cast ingot having a central part and slab profiles adjacent to it with narrow faces, characterized in that, in order to reduce the expenditure ratio of the metal in the production of thin slabs, the central part of the ingot has a regular section of a wideband mill section that is also equal to 30 COAL or round the shape rather wide 30 m / min (0.5 m / s), then pouring from the half-face of the slab readings of the proposed ingot adjacent to it allows the axes to be arranged to each other to co-ordinate the technological scheme in the form: scrap less than 180 °, and with their continuation one single-strand machine - one short-intersect inside the central part valuable broadband rolling lables. The arrangement of thin slabs 2 with wide edges oriented normally to the edges of the central part corresponds to the shrinking directions of these faces. It is possible to obtain thin slabs of various sizes and thickness (Fig. 3). Three thin slabs 2 are adjoined to the central part 1 of a round shape in the radial directions, and from their narrow faces, remote from the large-sized profile, they are joined by even thinner slides 3, whose broad edges also do the broad faces of settled thin slabs 2 or 3 120 °. the barite part of the ingot section The proposed ingot provides an increase in the productivity of casting and an increase in the mass fraction of thin slabs in an unbroken cast ingot while simultaneously expanding the range of profiles of the ingot section. Invention Formula the barite part of the ingot section Continuous cast ingot, having a central part and adjacent profiles adjacent to it with narrow faces, characterized in that, in order to reduce the expenditure ratio of the metal in the production of thin slabs, the central part of the ingot has Phie. one FIG. 2