CN1067610C

CN1067610C - Feed reservoir intended for retaining molten metal and in particular steel

Info

Publication number: CN1067610C
Application number: CN97125370A
Authority: CN
Inventors: 埃尔维·塔维尼耶; 艾蒂安·哈维特
Original assignee: Ugine Savoie SA; USINOR SA
Current assignee: Youjina - Ian Savoy, Vladimir; Ugine Savoie SA
Priority date: 1996-12-11
Filing date: 1997-12-10
Publication date: 2001-06-27
Anticipated expiration: 2017-12-10
Also published as: EP0847821A1; MX9709533A; TW429179B; ZA9710810B; FR2756762B1; KR19980064013A; FR2756762A1; ID18867A; CN1190039A; JPH10175046A; BR9705611A; CA2217434A1; AU4541197A

Abstract

Feed reservoir intended for retaining a molten metal and in particular a steel, the reservoir comprising a refractory bottom, refractory walls, at least one nozzle provided in the refractory bottom, for discharging, as an outflow, the molten metal in the reservoir, and a refractory buffer, having a cavity, placed on the bottom of the reservoir and intended for receiving a jet of molten metal coming from a ladle which is moved above the said reservoir, characterized in that the cavity in the buffer is formed by a buffer bottom and by an approximately vertical wall, the surface of the buffer bottom defining a convex volume.

Description

Be used for preserving the feed reservoir of molten steel

The present invention relates to a kind of feed reservoir that is used for preserving molten steel, holder has fire-resistant Di Hebi, on the fire-resistant end, have at least one cast gate so that the molten steel discharging in the holder is outflowed, on the fire-resistant buffer of a band cavity is placed at the bottom of the holder in addition, so that be used for being received in the molten steel jet of the pouring ladle that moves the holder top.

The production routine of steel in the downstream comprises the molten steel in the pouring ladle is vented in the feed reservoir that is called as distributor or tundish, by feed reservoir liquid metal provided to watering mold again.

Feed reservoir is formed in pouring ladle and waters transferance device between the mold, and its function is:

Molten steel transferred to from pouring ladle water mold;

Molten steel is assigned on each bar casting line;

With state of disturbance not molten steel is supplied to mold;

Finish pouring operation in order;

For example eliminate the coarse field trash that molten steel contains under certain conditions with lining or foaming bar.

Adopt lining for example shock plate be placed on the straight operation that can improve feed reservoir down that makes its position jet sleeve pipe under pouring ladle at the end of holder.This shock plate is also referred to as " buffer ".

The major function of buffer generally is to reduce the energy of the liquid metal jet of vertical landing on shock plate, reduces disturbance thereby make from pouring ladle and the liquid metal jet that enters holder.

In some cases, it is the time interval that buffer can limit short circuit, and first steel flow is just left holder after this time interval, and/or can to increase the time of staying be that steel flow rests on the time in the holder.

The objective of the invention is an exclusive district band will be provided so that reduce the energy that molten steel enters jet, in buffer, guarantee the wearing and tearing that the refractory material deposit causes owing to the fierce impact of the molten steel jet that enters holder as a means of compensation simultaneously.

The feed reservoir that is used for preserving molten steel that themes as of the present invention, holder is provided with a band cavity and buffer on being placed at the bottom of the holder, purpose is the molten steel jet that will be received in the pouring ladle that moves said holder top, it is characterized in that, cavity in the buffer be by at the bottom of the buffer and upright substantially wall constitute, the surface at the bottom of the buffer is convex shape.

Of the present invention other are characterized as:

The convex shape that surface at the bottom of the buffer forms, its top axis near the deposite metal jet;

Surface at the bottom of the buffer forms a pyramid;

Surface at the bottom of the buffer forms a circular cone;

Buffer has at least one discharge orifice;

The inwall of cavity has at least one peripheral extension of accepting level;

The periphery extension has at least one part at the bottom of buffer of turning down;

The inwall of cavity has a series of peripheral extension near level, forms the inwall of a band fold.

Explanation and the accompanying drawing that provides with regard to non-limiting example can make the present invention clearly be understood below.

Fig. 1 illustrates the production routine of steel in the downstream.

Fig. 2 is the profile according to an embodiment of fire-resistant buffer of the present invention.

Fig. 3,4 and 5 is the profile according to the other embodiment of fire-resistant buffer of the present invention.

During particularly the downstream of steel produces, there is a pouring ladle 1 will expect to supply with the feed reservoir 2 that is also referred to as distributor or tundish at metal, by feed reservoir 2 liquid metal is poured into connection and waters in the mold 4.

Feed reservoir 2 has the fire-resistant end 5 and wall 6, and purpose is to preserve the deposite metal within it, is provided with at least one cast gate 7 so that make the deposite metal discharging outflow of holder 2 on the fire-resistant end 5.Fire-resistant buffer 8 with cavity 9 is placed at the end of holder 2, its objective is the deposite metal jet 10 that will be received in the pouring ladle 1 that moves holder 2 tops.

In the production field of steel, first form of the present invention as shown in Figure 2, the cavity 9 of buffer 8 by at the bottom of the buffer 11 and approximately perpendicular wall 12 form.According to a feature of the present invention, 11 surface forms the volume of a projection at the bottom of the buffer, and that is to say, take up an official post 2 the formed volume of arbitrary line segment of this surface is included in this volume continuously.

Having at the bottom of the buffer of convex shape 11 forms an angle with the approximate upright sidewall of cavity 9 and can significantly reduce the energy that enters the interior molten steel jet 10 of buffer 8 cavitys 9.

By the approximate upright formed acute angle of wall of 11 shape at the bottom of the buffer and cavity 9 be district band can be used to reduce liquid metal enter the energy of jet and impel it along said wall 12 in being contained in feed reservoir metal and the surface of slag blanket rise, it mainly is hole by above the buffer that metal comes out from buffer.

In other words, wall 12 has at the bottom of the function of barrier metal and the buffer 11 sealing process and combines, and the energy of jet is calmed down.

The attenuation of energy is represented with the arrow of band spiral in circle.

Another advantage of the present invention is, the end 11 constitutes a bigger refractory material deposit, and this deposit can reduce owing to molten steel enters the wearing and tearing that the fierce impact of jet causes, particularly when pouring ladle 1 is opened.

Buffer 8 is a part of being made by refractory concrete, and it can be made into independent one, is fixed on to be made into independent one at the end 5 of holder, is fixed at the end 5 of holder and is placed on the straight below that pouring ladle 1 is provided the sleeve pipe of jet 10.

Buffer can have any geometry, but parallelepiped or columnar preferably.The most handy method of molding of buffer is made.Approximate upright wall is provided with gradient makes the easy demoulding of buffer.

Compare with the size at the end, wall 12 is higher, so just can gather the metal from pouring ladle, reduces its energy and it is risen to scum silica frost along wall 12.

Because its height, wall 12 can prevent that molten steel from directly flowing to consent.In addition, this wall can make the time of staying of metal in feed reservoir prolong.

In the example of Fig. 2, when buffer was parallelepiped, the end 11 of cavity 9, preferably became pyramid and combines with four approximate planes and upright sidewall.In this form, buffer forms four district's bands between its end and wall can significantly reduce the energy that molten steel enters jet.

When buffer was cylindrical shape, the end 11 of cavity 9, was preferably conical and combines with the upstanding sidewall of approximate circle tubular.In this form, buffer forms an annulus and can be used to significantly reduce the energy that molten steel enters jet between its end and wall.

In above-mentioned example, basal surface all form one top, it can be placed on the vertical axis of jet or from jet axis and slightly offset to one side.Rotating damper can make steel flow produce and rotatablely move, and rotatablely moving also helps to reduce the energy that molten steel enters jet.

In all cases, the formed top height of basal surface is always much smaller than the height of wall 12.

Buffer 8 must get out at least one discharge orifice 12 on its wall 12, be that molten steel can be flowed out at the end 5 of holder on the one hand, particularly also is not full of buffer can't overflow the time at molten steel; When making the inclusion of the cavity 9 of said buffer when finishing, casting can be drained.

As shown in Figure 3, in another kind of form of the present invention, the inwall 12 of cavity 9 has at least one peripheral extension 13 near level, surrounds whole or the part cavity.In other words, extension 13 can be located at wall 12 the surface with respect on any height of 11 at the bottom of the buffer, for example can be located at the middle cavity is separated into two parts.

The part reduces the space in cavity, for example in the cavity exit, can make steel flow jet to around return to the central axis of jet again after impacting, can strengthen the effect that reduces energy like this.

As shown in Figure 4, in another kind of form of the present invention, peripheral extension 13 has at least a part 14 to turn down at the bottom of buffer 11.In this example, steel flow is turned down at the end towards cavity, so that strengthen the effect that reduces energy.

As shown in Figure 5, this depends on the height of buffer, and the inwall of cavity preferably has a series of peripheral extension near level, forms the inwall of a band fold.These folds reduce angle together with the gradient of bottom protrusion shape, can significantly reduce the energy of steel flow after the molten steel jet impulse is on earth on 11, not only at the bottom of metal accumulates in buffer on the time, but also when molten steel when sidewall rises.

Have at buffer under the situation of one or more extensions, said extension can be made into single-piece for example annulus be fitted on the wall 12.This is because these one-piece unit just form an enclosure space with opposite slope, the not cause of easy molding together.

The holder that is proposed is provided with according to buffer of the present invention, owing to have district's band that can significantly reduce energy, thereby can make the minimizing optimization of molten steel disturbance in holder impact zone band.And the short circuit duration and the time of staying are optimized, thereby improve the clean-up performance of the steel of producing.

The deposit of the refractory material at the bottom of the formation cavity can make prolong the service life of buffer.

In addition, also can promote plug flow and reduce fringe time according to buffer of the present invention, promptly be converted to the cast required time of grade B from cast grade A, or such a period of time, in this time, the ending of the existing cast grade of holder A has the beginning of cast grade B again.

A kind of like this buffer of easy production itself can be placed in the holder, therefore just can add the lining of similar Ba Yan in holder in addition.

Claims

1. be used for preserving the feed reservoir of molten steel, this holder has fire-resistant Di Hebi, on the fire-resistant end, have at least one cast gate so that the molten steel discharging in the holder is outflowed, on the fire-resistant buffer of a band cavity is placed at the bottom of the holder in addition, be used for accepting the molten steel jet of the pouring ladle that moves from said holder top, it is characterized in that, the cavity in the buffer be by at the bottom of the buffer and upright substantially wall constitute, the surface at the bottom of the buffer is convex shape.

2. according to the holder of claim 1, it is characterized in that the convex surfaces that the surface at the bottom of the buffer forms, its top axis near the molten steel jet.

3. according to the described holder of claim 1, it is characterized in that the surface at the bottom of the buffer forms a pyramid.

4. according to the described holder of claim 1, it is characterized in that the surface at the bottom of the buffer forms a circular cone.

5. according to the described holder of claim 1, it is characterized in that buffer has at least one discharge orifice.

6. according to the described holder of claim 1, it is characterized in that the inwall of cavity has at least one peripheral extension near level.

7. according to the described holder of claim 6, it is characterized in that peripheral extension has at least one part at the bottom of buffer of turning down.

8. according to the described holder of claim 1, it is characterized in that the inwall of cavity has a series of peripheral extension near level, form the inwall of a band fold.