SU1687364A1 - Device for steel teeming - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used to protect the metal stream from secondary oxidation, mainly when steel is cast into ingots. The purpose of the invention is to more effectively protect a metal jet and simplify the maintenance of the device. In a device for protecting a jet with gas containing a refractory body, the base of which is a tangentially located branch pipe for introducing shielding gas, the body is made of two truncated cones that are connected It does not create a directed head-on jet of metal covering its flow of argon. The upper cavity of the refractory body prevents the device from being poured with metal when opening and closing the slide gate. The bottom cavity seals the center sprue. An annular nozzle for supplying argon is mounted on the upper end of the housing. On the upper wall of the lower cavity from the periphery to the center are plates 3 Il., 1 tab. cl

Description

The invention relates to ferrous metallurgy and can be used to protect the metal stream from secondary oxidation, mainly when steel is cast into ingots.

The purpose of the invention is to more effectively protect the metal jet and simplify the maintenance of the device.

Figure 1 presents the scheme of the device, a general view; figure 2 - section aa in figure 1; on fig.Z section bb on .1

The device for protection of the metal jet consists of a refractory body 1 made of two truncated cones connected with smaller bases and forming cavities 2, 3 and clamped 4. The diameter of the base of the upper cone is dB, the pinch diameter is dn. and the angle of inclination of the generatrix of the cone to the axis n is 15 °. The refractory body 1 is mounted on a cylindrical stand 5 having a tangentially dissipated / tubular nipple 6 and plate 7. An annular manifold 8 with an annular nozzle 9 and a manifold 10 is located on the vertical end of the body 1. integrally by frame 11 and mounted on receiving hopper 12 of the gating system

13 and sealed with sand shutter

14 A metal discharge from the collector 15 has a diameter of die.

The device works as follows.

but

00

vj s about

10–20 s before the start of the metal casting, argon is fed through the nozzle 6 at a flow rate of 97.2 Nm3 / h and the gating system 13 and the lower cavity 3 are flushed. Then the steel outlet collector 15 (, 07 m) is centered about the axis of symmetry of the device.

When metal appears in the collector 15, argon (230 Nm3 / h) is fed through the pipe 10, the collector 8 and the annular nozzle 9. preventing air from entering the upper cavity 2. The upper cavity 2 of the refractory body 1 prevents the device from being poured with metal during opening and closing the slide valve, inaccurate centering of the collector 15 relative to the device and isolates the melt stream from the ambient air in the main flight section and in the receiving funnel 12 of the gating system 13.

wearing

In the experiments varied

oY

The results of the experiments are shown in the table.

0

five

0

five

Optimum ratio - - 1,8, kodk

The second provides the oxygen content in the area of the melt stream of less than 1% without the formation of walling on the bottom of the ladle and the annular manifold.

Claims (1)

The invention is a steel casting device containing a steel outlet collector, centering, at the upper end of which a device for protecting a metal stream is fixed, in the form of a refractory material body with a tangential gas inlet located in its lower part, characterized in that more efficient protection of the metal jet and simplified maintenance of the device; a device for protecting the metal jet is provided with a ribbed bushing and an annular manifold for gas supply located on the upper side The ring of the said case, and the latter is made in the form of two hollow truncated cones connected by smaller bases with a diameter of 1.4-2.3 times the diameter of the steel outlet collector, with the ribbed sleeve fixed inside the lower truncated cone. 60 FIG. 2 ft &