CN202591603U - Convectional submerged nozzle for plate blank continuous casting - Google Patents

Abstract

The utility model relates to a convectional submerged nozzle for plate blank continuous casting. The convectional submerged nozzle comprises a body of the submerged nozzle, wherein the body comprises an inner wall, a nozzle main passage and an upper part of the submerged nozzle; the body is provided with two pairs of discharge holes which are vertically arranged up and down and have opposite inclination angles; the discharge holes are upper discharge holes and lower discharge holes respectively; the distance from the lower discharge holes to the bottom of the body is 10-20 mm; the upper discharge holes are symmetrically distributed and have downward inclination angles; and the lower discharge holes are symmetrically distributed and have upward inclination angles. The convectional submerged nozzle has the advantages that kinetic energy can be neutralized after a steel flow flows through the two pairs of discharge holes which are vertically distributed and have opposite inclination angles, so that flotation of inclusions and bubbles is facilitated and the internal quality of a casting blank is improved, and the direction of the steel flow can be conveniently adjusted to meet technological requirements by adjusting the size and the inclination angle of the nozzle.

Description

A kind of sheet billet continuous casting convection immerses the mouth of a river

[technical field]

The utility model relates to the continuous casting steel machine technical field, specifically, is that a kind of sheet billet continuous casting convection immerses the mouth of a river.

[background technology]

Mostly the submersed nozzle of sheet billet continuous casting is bilateral single hole shape at present, adopts the hole that spues at downward 15-35 ° inclination angle.And in continuous casting is produced; Particularly in the casting process of high casting speed continuous casting or wide thickness plate continuous casting; Because the steel-passing amount of crystallizer is big, it is also bigger to need molten steel to pass through the flow of submersed nozzle, and the impact depth that causes getting into behind the crystallizer from the molten steel that submersed nozzle comes out is darker.In the casting blank solidification process, because having little time to float, field trash in the liquid molten steel and bubble just caught by the solidification front in the strand, cause the inner flaw detection of slab not conform to and exceed standard.And some steel grade need guarantee the strand internal soundness through low pulling rate, or because rhythm of production etc. need low pulling rate, but crystallizer molten steel surface comparatively " extremely " during low pulling rate is easy to generate casting billet surface and ties cold steel slag inclusion or disconnected slag etc. unusually.For reducing the big problem that produces of high pulling rate molten steel impact depth, at present methods that reduce pulling rate or electromagnetic braking that adopt more.The shortcoming of this method is: reduce the performance that pulling rate is unfavorable for production capacity, the electromagnetic braking equipment investment is big, and use and maintenance cost is high; And be to reduce the inactive problem that produces of crystallizer molten steel surface when hanging down pulling rate, the methods that adopt increase crystallizer argon gas amounts of being blown into or electromagnetism to quicken more.The shortcoming of this method is: increase argon gas and be blown into, it is unusual to cause crystallizer molten steel surface to seethe with slag inclusion, molten steel oxidation etc. easily.Equally, the investment of electromagnetism acceleration equipment is big, and use and maintenance cost is high.When reducing the molten steel impact depth, can improve again in the whole bag of tricks in mold liquid level flow field,, also not find with the steel passing hole form that changes submersed nozzle and the next relevant introduction that effectively improves that distributes according to the related patent U.S. Patent No. of domestic and international announcement.

[utility model content]

The purpose of the utility model is to overcome the deficiency of prior art, provides a kind of sheet billet continuous casting convection to immerse the mouth of a river; The utility model is in order to reduce molten steel bigger impact kinetic energy when submersed nozzle flows out; Fundamentally with single hole submersed nozzle structure; Be designed to the structure of diplopore convection submersed nozzle, reduce steel stream impact depth, improve field trash and bubble floating speed to reach; Optimize the crystallizer molten steel surface flow field, effectively reduce the purpose that investment also can improve slab quality.

The purpose of the utility model realizes through following technical scheme:

A kind of sheet billet continuous casting convection immerses the mouth of a river, and it comprises the body that the sheet billet continuous casting convection immerses the mouth of a river, and body comprises inwall, main channel, the mouth of a river, the top of submersed nozzle; On body, be provided with two pairs of vertical up and down layouts and the relative hole that spues, inclination angle, be respectively hole and the bottom hole that spues that spues, top, the distance that the bottom spues bottom the pitch-row body is 10～20mm.

The hole one that spues on being, hole that spues, top, on the hole two that spues, the hole that spues, bottom is the hole one that spues down, hole two time spues.

Described top spue the hole for be symmetrically distributed and the inclination angle for downwards.

Described bottom spues, and the hole is symmetrical distribution and the inclination angle is upwards.

Compared with prior art, the good effect of the utility model is:

(1) adopts this device, need not to carry out large-scale technological transformation and investment in fixed assets, on existing any slab caster, can both come into operation at once;

(3) steel stream spues after orifice flow goes out through vertical distribution and relative two couple in inclination angle, and kinetic energy obtains neutralization, helps the come-up of field trash and bubble, has improved the strand internal soundness;

(3) through the size and the inclination angle at the adjustment mouth of a river, the direction that can regulate steel stream easily is to satisfy the technological requirement of different casting machines.For example, can adopt the bigger inclination angle, hole that spues, make the impulsive force of steel stream near the hole that spues, obtain neutralization,, improve the uniformity and cast safety of base shell to reduce steel stream to the washing away of minor face base shell for light-gauge crystallizer.And for the wide thickness plate continuous casting base of the higher internal soundness of needs, the size that can increase the hole that spues down reduces steel and flows to the intensity of impacting down.

[description of drawings]

The structural representation of Fig. 1 the utility model.

Label in the accompanying drawing is: 1 inwall, and main channel, 2 mouth of a river, the top of 3 submersed nozzles, the last hole one that spues of 4-1, the last hole two that spues of 4-2, the hole one that spues under the 5-1, hole two spues under the 5-2.

[specific embodiment]

The utility model specific embodiment that a kind of sheet billet continuous casting convection immerses the mouth of a river below is provided.

Embodiment 1

In Baogang Stocks Trading Co.'s wide thickness plate continuous casting operation, because the casting size is the specification of 300mm * 2300mm to the maximum, steel-passing amount is bigger; After steel stream goes out from the orifice flow that spues; Impact depth is darker, field trash and bubble floating difficulty, and it is a main defective of slab continuous casting billet that flaw detection does not all the time conform to.In order to reduce the impact depth of molten steel, improve the come-up efficient of field trash and bubble, following reforming test is carried out at the mouth of a river of Baogang Stocks Trading Co.'s slab continuous casting working procedure.The main distinction of this submersed nozzle and general submersed nozzle is in two couple that vertical distribution is arranged hole that spues.The inwall 1 of other parts such as submersed nozzle, main channel, the mouth of a river 2, the top 3 of submersed nozzle is as good as with common submersed nozzle.Described top hole hole one 4-1 that spues on being that spues, on hole two 4-2 that spue, the hole that spues, bottom is hole one 5-1 that spues down, hole two 5-2 time spue.Hole one 4-1 that spues wherein, on the spue inclination angle of hole two 4-2 be downward 15 degree, be of a size of 65mm * 40mm, hole one 5-1 that spues down, the inclination angle of hole two 5-2 that spue down is 25 degree upwards, is of a size of 65mm * 45mm.Flow to the guide effect of upward flowing for increasing steel, mouth of a river inner bottom part is from the spacing of the Kong Youyi 10mm that spues down.During casting, after molten steel came out from the hole that spues that two symmetries are come out, momentum separately impacted neutralization mutually, and the kinetic energy that molten steel impacts downwards effectively reduces, and impact depth is controlled.5 cast of contrast statistics heat, after the use present technique, the slab flaw detection qualification rate has risen 65%.

The above only is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model design; Can also make some improvement and retouching, these improvement and retouching also should be regarded as in the protection domain of the utility model.

Claims (4)

1. a sheet billet continuous casting convection immerses the mouth of a river, and it comprises the body that the sheet billet continuous casting convection immerses the mouth of a river, and body comprises inwall (1), the top (3) of main channel, the mouth of a river (2) and submersed nozzle; It is characterized in that, on body, be provided with two pairs of vertical up and down layouts and the relative hole that spues, inclination angle, be respectively hole and the bottom hole that spues that spues, top, the distance that the bottom spues bottom the pitch-row body is l0～20mm.

2. a kind of sheet billet continuous casting convection as claimed in claim 1 immerses the mouth of a river, it is characterized in that, the hole one (4-1) that spues on being, hole that spues, described top, on the hole two (4-2) that spues, the hole that spues, bottom is the hole one (5-1) that spues down, hole two (5-2) time spues.

3. a kind of sheet billet continuous casting convection as claimed in claim 1 immerses the mouth of a river, it is characterized in that, described top spue the hole for be symmetrically distributed and the inclination angle for downwards.

4. a kind of sheet billet continuous casting convection as claimed in claim 1 immerses the mouth of a river, it is characterized in that, described bottom spues, and the hole is symmetrical distribution and the inclination angle is upwards.

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