CN202224648U

CN202224648U - Submersed nozzle for crystallizer for thick plate blanks and blooms

Info

Publication number: CN202224648U
Application number: CN201120322989XU
Authority: CN
Inventors: 徐海伦; 马春武; 邵远敬; 叶理德
Original assignee: Wisdri Engineering and Research Incorporation Ltd
Current assignee: Wisdri Engineering and Research Incorporation Ltd
Priority date: 2011-08-31
Filing date: 2011-08-31
Publication date: 2012-05-23
Anticipated expiration: 2021-08-31

Abstract

The utility model relates to a submersed nozzle for a crystallizer for thick plate blanks and blooms, which comprises side walls, a bottom, an inner cavity or a center hole and two side holes. The bottom is connected with the side walls, the side walls and the bottom encircle to form the vertical inner cavity or the vertical center hole, the two side holes which are symmetric left and right and connected with the inner cavity are arranged on the side walls, and upper and lower wall surfaces of the side holes are inclined relative to the horizontal direction. The submersed nozzle is characterized in that the left wall surface and the right wall surface of each side hole are inclined from inside to outside, and the side holes are in the shape of a horn extending outwards. The left wall surfaces and the right wall surfaces of the side walls extend outwards, molten steel flowing out from the side holes of the nozzle can move towards two sides, which are close to corners, of a narrow surface on a flow guiding effect of outwards extending inclinations, and accordingly the molten steel can be transversely uniformly distributed on the integral narrow surface. In addition, the submersed nozzle can prevent quality defects such as cracking or segregation and the like due to the fact that the transverse temperature and content of molten steel are uneven, simultaneously, the high-temperature molten steel can directly run to corners of the crystallizer, and problems of cold bonded steel, caking of covering slag and the like due to excessively cold temperature of the corners are effectively avoided.

Description

A kind of heavy slab and bloom crystallizer are used submersed nozzle

Technical field

The utility model belongs to continuous-casting of steel billet crystallizer submersed nozzle device; The submersed nozzle device of crystallizer used (the heavy slab here is meant the continuous casting steel billet of thickness greater than 250mm, and bloom generally is meant the continuous casting square billet of strand cross dimension greater than 200mm * 200mm) when relating generally to heavy slab and bloom continuous casting.

Background technology

In the continuous pouring process of steel, need the molten steel in the tundish continuously be delivered in the crystallizer through submersed nozzle device by the refractory material preparation.Submersed nozzle can prevent not only that molten steel is exposed to and produce oxidation in the air, can also regulate the flow pattern of molten steel in crystallizer, and molten steel is solidified with state preferably in crystallizer.The assurance of slab quality and the direct motion of continuous casting process all with crystallizer in the Molten Steel Flow behavior close contact is arranged, and the main means of Molten Steel Flow behavior are exactly to select suitable submersed nozzle physical dimension to satisfy the requirement of pouring conditions such as crystallizer cast section, pulling rate and steel grade in the crystallization control device.It is generally acknowledged; Whether rationally be exactly see when adopting this submerged nozzle whether crystallizer flow field satisfy following three points: the liquid fluctuating that (1) is suitable if weighing the submersed nozzle physical dimension; Can avoid problems such as covering slag turnup and meniscus destruction, again can the validation slag; (2) transversely even temperature and component distributing of crystallizer can prevent that excessive generation lobe of thermal stress and uneven components from producing segregation, can avoid the local overcooling crust again; (3) the molten steel thermal center (-tre) is moved on as far as possible, can promote initial solidification shell rationally grow and be mingled with, effective come-up of bubble.

Under the prior art, the heavy slab crystallizer mainly adopts the submersed nozzle cast of bilateral hole; Bloom requires difference can adopt the through-type mouth of a river, the mouth of a river, bilateral hole and the four side opening mouths of a river according to cast.The mouth of a river, the bilateral hole agent structure that heavy slab and bloom adopted is basic identical; All form with symmetrical two side openings that link to each other with inner chamber by the inner chamber of vertical direction; Side opening is aimed at crystallizer leptoprosopy center during cast, and the side opening shape can and be up and down that semicircle, centre are the nearly ellipse of rectangle for chamfering rectangle, circle, ellipse.An outstanding feature of the type side opening is, lower wall surface and horizontal direction are certain inclination angle on the side opening, but about two walls keep level, parallel with the wide face of crystallizer.When heavy slab crystallizer and bloom crystallizer adopt the cast of the existing mouth of a river, bilateral hole, because the width of crystallizer leptoprosopy width side opening much larger than the mouth of a river, and the side opening two side walls is vertical with leptoprosopy; Thereby; When molten steel moved to the crystallizer leptoprosopy from the mouth of a river, the position in the middle of can only jet to leptoprosopy can not be distributed to whole leptoprosopy in the horizontal; Make crystallizer temperature and composition transversely be difficult to evenly be easy to generate defectives such as longitudinal crack or component segregation.Particularly replenishing of high-temperature molten steel owing to itself be the two dimension cooling, flowed out less than the mouth of a river again in the bight, problems such as cold steel of knot or covering slag caking usually occur, had a strong impact on continuous casting process direct motion and continuous casting billet quality.

Summary of the invention

The technical problem that the utility model will solve is; Above-mentioned deficiency to prior art; Provide a kind of heavy slab and bloom crystallizer to use submersed nozzle, make to obtain Molten Steel Flow pattern preferably in heavy slab and the bloom crystallizer, obtain even temperature and component distributing in the horizontal; Effectively avoid the bight to tie production problems such as cold steel or covering slag caking, guarantee continuous casting process direct motion and slab quality.

For achieving the above object, the technical scheme of the utility model is:

A kind of heavy slab and bloom crystallizer are used submersed nozzle; Comprise sidewall, the bottom that links to each other with sidewall, mouth of a river opened upper end, sidewall and bottom surround the hollow ring intracoelomic cavity of vertical direction; Offer two shapes, big or small identical on the sidewall; With intracavity inter-connection and along lumen centers line side opening axisymmetricly, lower wall surface is the plane and is the angle of inclination with horizontal direction on the side opening, and two walls are the plane about side opening; It is characterized in that: about side opening two walls by interior outward-dipping, be extend out horn-like.

Two walls are 5 °～45 ° by interior outward-dipping, inclination angle scope about side opening.

Side opening up and down side tilts by the interior outside while and horizontal by-25 °～15 ° inclination angle downward or upward.

The intracavity section at the mouth of a river is circular, oval or pancake; The bottom, the mouth of a river of inner chamber lower end is sunken bottom, flat or concave bottom.

With respect to prior art, there is following beneficial effect in the bilateral hole submersed nozzle of the utility model:

Because side opening left and right sides wall has the inclination angle that extends out, the molten steel that flows out from mouth of a river side opening can make molten steel can be distributed to whole leptoprosopy uniformly in the horizontal extending out under the guide functions at inclination angle to two lateral movements of leptoprosopy near the bight.Can prevent mass defects such as crackle that molten steel transverse temperature and uneven components cause or segregation like this; Simultaneously; Can also make high-temperature molten steel directly move to the bight of crystallizer; Effectively avoid the bight because of cast problems such as the cold steel of knot of crossing cold generation and covering slag cakings, make the crystallizer flow field reach comparatively desirable state, thereby better meet the production demand.

Description of drawings

Fig. 1 is the structural representation of the utility model bilateral hole submersed nozzle;

Fig. 2 is that side opening A is to view;

Fig. 3 is that submersed nozzle B-B is to cutaway view;

Label is following in the accompanying drawing, 1-sidewall, 2-bottom, 3-inner chamber, 4-side opening.

The specific embodiment

Below in conjunction with embodiment and accompanying drawing 1-3 the utility model is described further, but does not limit the utility model.

Referring to Fig. 1～Fig. 3, a kind of heavy slab and bloom are used submersed nozzle, comprise mouth of a river sidewall 1, and said mouth of a river sidewall 1 is the bottom 2 of sealing bottom, and bottom 2 can be convex, flat shape or spill.Sidewall 1 is an inner chamber 3 with the central space that bottom 2 surrounds, and the cross sectional shape of said inner chamber can be circular, oval or platypelloid type.Bottom 2 upsides that are positioned at mouth of a river body 1 have a contralateral exposure 4, and two side holes 4 communicates with mouth of a river inner chamber 3, equal and opposite in direction, and along inner chamber 3 center lines axisymmetricly.Lower wall surface is simultaneously from inside to outside toward having a down dip on the side opening 4, and is-25 °～15 ° angle with horizontal direction, like lower wall surface level on 0 ° the time.There is certain angle beta (5 °≤β≤45 °) from inside to outside in said side opening 4 two side walls, form a kind of two side walls outward-dipping, be the horn-like side opening that extends out, specifically as shown in Figure 3.

The above disclosed preferred embodiment that is merely the utility model can not limit the interest field of the utility model certainly with this, so according to the equivalence variation that the utility model claim is done, still belong to the protection domain of the utility model.

Claims

1. heavy slab and bloom crystallizer are used submersed nozzle; Comprise sidewall, the bottom that links to each other with sidewall, mouth of a river opened upper end, sidewall and bottom surround the hollow ring intracoelomic cavity of vertical direction; Offer two shapes, big or small identical on the sidewall; With intracavity inter-connection and along lumen centers line side opening axisymmetricly, lower wall surface is the plane and is the angle of inclination with horizontal direction on the side opening, and two walls are the plane about side opening; It is characterized in that: about side opening two walls by interior outward-dipping, be extend out horn-like.

2. the mouth of a river according to claim 1 is characterized in that about side opening that two walls are 5 °～45 ° by interior outward-dipping, inclination angle scope.

3. the mouth of a river according to claim 1 and 2 is characterized in that side opening tilts by the interior outside while and horizontal by-25 °～15 ° inclination angle the side up and down downward or upward.

4. the mouth of a river according to claim 1 and 2 is characterized in that the intracavity section at the mouth of a river is circular, oval or pancake; The bottom, the mouth of a river of inner chamber lower end is sunken bottom, flat or concave bottom.

5. the mouth of a river according to claim 3 is characterized in that the intracavity section at the mouth of a river is circular, oval or pancake; The bottom, the mouth of a river of inner chamber lower end is sunken bottom, flat or concave bottom.