CN1171752A

CN1171752A - Tundish impact pad

Info

Publication number: CN1171752A
Application number: CN95197120.4A
Authority: CN
Inventors: D·R·扎卡赖亚斯
Original assignee: Foseco International Ltd
Current assignee: Foseco International Ltd
Priority date: 1994-11-09
Filing date: 1995-10-24
Publication date: 1998-01-28
Anticipated expiration: 2015-10-24
Also published as: BR9509706A; FI971968A0; DK0790873T3; CN1069243C; TW321615B; CA2162551C; WO1996014951A1; DE69502838D1; JP4007429B2; EP0790873A1; EP0790873B1; TR199501393A2; FI971968A; AU692622B2; ES2104525T3; MX9703352A; DE69502838T2; CA2162551A1; ES2104525T1; FI110312B

Abstract

A tundish impact pad (20) to reduce turbulence in the tundish comprises a body of refractory material capable of withstanding contact with molten steel in a tundish (10), the body comprising a base (22) having an impact surface (24), an outer sidewall (26, 40) extending upwardly from the impact surface (24), a top surface (32) connected to the sidewall (26, 40) and defining an opening (30) therein, in which the top surface (32) has an inner annular portion (42) substantially parallel to the impact surface (24), and the sidewall (26, 40) has an interior face (28) which is substantially perpendicular to the impact surface (24) and wherein a substantially right angle corner (24A) is provided between the sidewall (28) and the impact surface (24) and a substantially right angle corner is provided between the sidewall (28) and the top surface inner annular portion (42).

Description

The tundish impact pad

The present invention relates to a kind of tundish impact pad, promptly a kind of tundish bottom that is configured in is to accept to inject from ladle the resistant material backing plate of the motlten metal injection stream of tundish.

United States Patent (USP) 5169591 discloses a kind of impact pad that is used for the tundish of continuous casting steel machine, it comprises a pedestal, an annular top surface and the discontinuous sidewall that extends between pedestal and annular top surface, this sidewall has a recessed inner surface, and this surface can be an arc.

United States Patent (USP) 5358551 discloses a kind of impact pad, and it comprises a pedestal and the sidewall around the pedestal extension, and this inside surface of side wall has an inside upwardly extending part.Described inner surface can be recessed.

Although the design of aforementioned two kinds of impact pads all is the turbulent flow that is used for reducing in the tundish, the discovery that we are surprised: can further reduce turbulent flow by a kind of impact pad that has interior angle is provided, described interior angle is limited between pedestal, annular wall and the upper surface of liner.Thereby, we find to provide this interior angle to have superiority and can reduce surface turbulence, reduce to obtain improvement aspect the situation that reoxidizes that slag is mingled with, prevents the breaking of tundish flux cover, molten steel as far as possible, and can guarantee molten steel suitable flow channel in tundish.

Therefore, the invention provides on the one hand a kind of tundish impact pad, it comprise one can bear with tundish in the contacted refractory material of body of molten steel; This main body comprises that a pedestal with shock surface, one link to each other with sidewall and top surface, this top surface of determining opening therein has one and be arranged essentially parallel to the annular inner portion of shock surface and this sidewall has an inner surface that is substantially perpendicular to shock surface from the upwardly extending annular outboard wall of shock surface, one, are wherein forming a rectangular basically bight respectively between sidewall and the shock surface and between the annular inner portion of sidewall and top surface.

The molten steel that flows into and contact with shock surface by opening outwards flows, and it turns to interior stream under the effect of side wall inner surfaces then, flows out opening at last.

Sidewall is annular preferably, and promptly it extends continuously around shock surface.

Opening shape is preferably uneven, and promptly it has long size and a shorter size vertical with this longer size.For example, it can be rectangle or ellipse.

For simplicity, the outer surface of cupular part of liner also can be parallel to shock surface.

Impact pad of the present invention not only changes the flow direction of injecting molten steel, and can evenly disperse the steel flow injected.

Since use liner of the present invention and the liner that uses circular or other even profile mutually specific energy steel stream is dispersed on the bigger zone, therefore guarantee to reduce splash and turbulent flow in make mobile more even along the surface.Because the non-homogeneous profile of impact pad compares with the liner (as circular or square) of the equal even profile of width, it is one bigger " target " that described liner injects steel stream relatively, even, also can obtain required result so steel stream can not be ideally and impact pad center line centering.

The present invention is specially adapted to improve time of staying allocation of parameters when pour steel.Because the present invention simplified cavity shape, so it can reduce cost, and compares overall dimensions with existing impact pad and also correspondingly reduced.

Impact pad according to the present invention is made of a kind of can bearing with motlten metal, the particularly fire proofing composition with the molten steel Continuous Contact of the operation of continuous casting for example.In a kind of standard of common requirement use-and the high alumina monolithic refractory, its alumina content accounts for about 55% to 85% of weight.Because the chemical reaction of molten steel preferably adopts a kind of basic refractory, preferably adopts a kind of magnesium base monolithic refractory, its MgO accounts for 58% to 93% of weight.

On the other hand, the invention provides a kind of tundish that is used to hold a certain amount of molten steel, it has a bottom and sidewall, and described bottom and sidewall sealing form a shock zone and outlet, and impact pad of the present invention is configured in the impact zone of tundish bottom.

Form with embodiment is described embodiment of the present invention with reference to the accompanying drawings, wherein:

Fig. 1 is the tundish side cross-sectional view that comprises impact pad of the present invention, and impact pad is configured in the tundish bottom;

Fig. 2 is the vertical view of impact pad among Fig. 1, shows the position (I along the line is to I) of Fig. 1 cross section;

Fig. 3 is the cross-sectional view along Fig. 2 center line III-III;

Fig. 4 is the zoomed-in view of impact pad part among Fig. 3.

Figure 1 illustrates the tundish 10 of a routine, it comprises a liner 12 and a pair of cast gate or exports 14 that this outlet makes motlten metal (being commonly referred to as molten steel) continuously flow out tundish 10 from the molten bath 16 of tundish 10 and enters the crystallizer (not shown) that can form metal casting.Usually, fire-resistant sleeve 18 of ladle or the similar tundish equipment of filling in are configured in the top of tundish 10 and continuously motlten metal stream are introduced tundish 10.Generally be placed on the central authorities of tundish 10 bottoms 15 according to the tundish impact pad 20 of the present invention's structure.

To shown in Figure 4, the shape of tundish impact pad 20 is preferably rectangle as Fig. 1, and its long limit is parallel to the longitudinal axis of tundish.Liner comprises a pedestal 22 that has horizontal impact plane 24.Liner 20 also comprises the continuous circular shape

lateral wall

26,40 with inner wall surface 28.Impact pad 20 comprises that also one links to each other with

sidewall

26,40 and is parallel to the top surface 32 of shock surface 24, and forms a non-homogeneous opening 30 therein.So-called " non-homogeneous " refers to opening 30 is not circular or square, but have longer size a 30 ' (see figure 2) and one basically with this longer size 30 ' vertical shorter size 30 ".

From Fig. 1 to Fig. 4 as can be seen, inside surface of side wall 28 extends upward with vertical with shock surface 24 basically angle around the periphery of whole shock surface 24.The continuity Characteristics of inner surface 28 the best in Fig. 2 illustrates, and its continuity is shown in broken lines in Fig. 2.

As shown in Figure 3 and Figure 4, sidewall 28 forms two wedge angle 28A and 28B with the lower portion 42 of shock surface 24 and end face 32 respectively, and described wedge angle also extends continuously round the inside of impact pad.

As shown in Figure 1, lateral wall 26 can be inside taper to the direction of pedestal 22 from top surface 32, and forms two ears 27 at relative two sides.When using the tundish of some type, ear 27 helps impact pad 20 is connected on the pedestal or bottom 15 of tundish.Perhaps, only in a usual manner impact pad 20 is installed on the bottom of tundish.

The bottom that should be pointed out that top surface 32 has annular section 39,42 (see figure 3)s, and this annular section is parallel to shock surface 24.This annular overhanging surperficial 42 helps correct guide molten steel in the process of cast tundish 10.Should be pointed out that the longer size 30 of opening 30 ' and the longer size of tundish (promptly export the size between 14, alignment as shown in Figure 1), and the shorter size 30 of opening 30 " is alignd with the shorter size of tundish 10.

Lateral wall part 40 resembles with it and is inside back taper sidewall 26, not as preferably being slight outside back taper (for example tapering is 2 ° to 5 °), as shown in Figure 3.Perhaps, make

sidewall

26 and 40 become straight flange, and straight sidewall 26 can be equipped with ear 27 or do not adorn.

The refractory material of manufacturing impact pad 20 must bear the Continuous Contact with molten steel in the whole life cycle of tundish 10.This material must have enough fire resistances, can adopt usually a kind of standard in-the high alumina monolithic refractory.For example, can use the alumina content refractory material between 55% to 85% greatly.Because the chemical reaction of molten steel, preferably adopt a kind of basic refractory, specifically be a kind of be the monolithic refractory of substrate with MgO, wherein the content of MgO is preferably between 58% to 93%.

To shown in Figure 4, the configuration of impact pad 20 is rectangle preferably, also can select other non-homogeneous configuration as Fig. 1.For example, can use the polygon liner of ellipse or other type, as long as liner has an opening, the long size of this opening is alignd with the long size of tundish 10 and it is lacked size and aligns with the short size of tundish 10 and get final product.

When using tundish liner 20 shown in Figure 1, the molten steel of the position flow channel 34 above being arranged on liner 20 impacts described shock surface 24, and molten steel direction as shown in arrow 35 radially outwards moves then.When molten steel impacts inside surface of side wall 28, shown among Fig. 1 36, its inwardly upwards flows earlier again, shown in arrow among Fig. 1 37,38, totally radially outwards disperse at last, reduced molten bath 16 lip-deep turbulent flows so as far as possible and helped slag and other impurity are derived from steel stream 34.

The bight that dots in the plane of Fig. 2 is also nonessential to be such as shown in the figure fillet, and if desired, this bight also can be the right angle.

If desired, also less fillet can be arranged at sidewall with vertical bight between shock surface and/or the top surface annular inner portion.

Claims

1. an impact pad (20), it comprises that can be born a refractory material of body that contacts with molten steel in the tundish (10), this main body comprises a pedestal (22) with shock surface (24), one from the upwardly extending lateral wall (26 of shock surface (24), 40), one and sidewall (26,40) the continuous top surface (32) of also determining an opening (30) therein, it is characterized in that, top surface (32) has the annular inner portion (42) that is arranged essentially parallel to shock surface (24), sidewall (26,40) has vertical with shock surface (24) basically inner surface (28), wherein between sidewall (28) and shock surface (24), a rectangular basically bight (28A) is set, and between sidewall (28) and top surface annular inner portion (42), has rectangular basically bight.

2. the tundish impact pad according to claim 1 is characterized in that, described opening (30) has a longer size (30 ') and shorter size (30 ") vertical with this length size (30 ').

3. the tundish impact pad according to claim 2 is characterized in that, described opening (30) is rectangle or ellipse.

4. one kind according to claim 1,2 or 3 tundish impact pad, it is characterized in that the outer surface of cupular part of liner (32) is parallel to shock surface (24).

5. the tundish impact pad according to aforementioned each claim is characterized in that, sidewall (26,40) is annular.

6. the tundish impact pad according to aforementioned each claim is characterized in that, liner (20) is to be made by the monolithic refractory that a kind of alumina content accounts for weight 55% to 85%.

7. one kind according to each tundish impact pad in the claim 1 to 5, it is characterized in that, liner (20) is to comprise that magnesia and magnesia account for 58% to 93% monolithic refractory of weight.

8. tundish (10) that is used for a certain amount of molten steel of splendid attire (16), it has bottom (15) and sidewall (12), bottom (15) and sidewall (12) form a shock zone and outlet (14), it is characterized in that tundish (10) comprises one as the described impact pad of each aforementioned claim (20) at the impact zone of its bottom (15).

9. tundish according to claim 8, it is characterized in that, impact pad (20) has an opening (30) that receives motlten metal stream, described opening (30) has a longer size (30 '), and (30 "), the longer size (30 ') of opening (30) is alignd with the longer size of tundish with a shorter size vertical with this longer size (30 ').