CN207057616U - A kind of rare earth steel, Aluminum steel or the stainless steel tundish upper nozzle that prevents adhesion - Google Patents

Abstract

The utility model discloses a kind of rare earth steel, Aluminum steel or the stainless steel tundish upper nozzle that prevents adhesion, its internal structure includes upper and bottom section, and aditus laryngis forms upper part with upper bit；Upper part offers 5 100 Argon apertures, and a diameter of 1 30mm of Argon aperture, the normal direction of filling pipe end inner surface and the angle of the axis direction of Argon aperture are β, and the opening direction of Argon aperture is inclined upwardly, and β span is 0 °<β<90°；The bottom of aditus laryngis extends vertically downwards again after vertically making an angle alpha oblique upper extension laterally, formation lower part, 90 °<α<180°；The inside radius of lower part distance d, 5mm≤d≤100mm bigger than inside radius at aditus laryngis.The tundish upper nozzle is avoided in molten steel containing bubble so as to be adversely affected to the coagulation band of molten steel, can also be carried out the sequence casting of rare earth steel, Aluminum steel and stainless steel, not blocked the mouth of a river.

Description

A kind of rare earth steel, Aluminum steel or the stainless steel tundish upper nozzle that prevents adhesion

Technical field

Metallurgical industry production technical field is the utility model is related to, more particularly to a kind of rare earth steel, Aluminum steel or stainless The steel tundish upper nozzle that prevents adhesion.

Background technology

Multiple studies have shown that：The raising of RE Elements on Steel material performance is favourable.Rare earth can reduce the grain size of steel, carry The toughness and low temperature impact properties of high steel, improve the anti-lamellar tearing ability in slab thickness direction etc..It is but dilute due to being limited by Continuous casting sprue is blocked in native steel production process and hinders steel-making continuous production this key problem, the exploitation of rare earth steel and using by Greatly limitation, is nearly at dead state at present.

Aluminum steel is also common steel grade, but because Aluminum steel also easily blocks continuous casting sprue, influences the normal production of continuous casting, Therefore it is forced to pour time production (the stove number that company pours is few) using small, therefore adds the cost of steel-making.

Stainless steel blocking when using continuous casting process cast is more serious, and company is poured hardly more than 3 stoves.

The top of filling pipe end (on aditus laryngis, aditus laryngis is at filling pipe end diameter minimum) table in the mouth of a river often occurs for above-mentioned steel grade Face and molten steel adhesion phenomenon, this operation and control molten steel flow to stopper head all generate adverse effect.

Patent " the compound water mouth for casting rare-earth steel " (number of patent application applied according to Shanghai No.3 Iron ＆. Steel Plant Zhao institute treasure et al. For CN86200556U) to introduce, the utility model patent provides a kind of Compound Water that can prevent nozzle clogging for steel smelting Mouthful, be characterized in mouth of a river inwall be equipped with>95%SiO₂Vitreous silica is the bushing pipe of material.In rare earth steel casting process, by In the change of mouth of a river refractory material material, nozzle clogging physical property matter is changed, and improves re inclusion and mouth of a river inwall The interface energy of storeroom, so as to avoid the stagnant knot of re inclusion, it is therefore prevented that the generation of dross.

But due to the SiO in the above-mentioned mouth of a river₂Be easy to be washed off by steel fall into molten steel formed field trash and it is not extensive Use.

Patent " the conticasting technology for feeding rare-earth wires into tundish " (number of patent application applied according to Institutes Of Technology Of Nanjing Zhang Xuesong et al. 01127004.7) to introduce, the patent is the method for avoiding rare earth steel water blocking mouthh from using tundish feeding rare-earth wires, but due to the party The molten steel Rare-Earth Content of method is uneven and influences the normal production of continuous casting without being widely adopted.

According to patent " continuous casting pouring basket rare earth adding technology " (patent application for appointing newly-built et al. application of Baotou Iron and Steel Company Number for 200510053297.9) introduce, the patent also using tundish feeding rare earth technique, there is also content of rare earth for the patent The problem of uneven.

According to the utility model patent for being permitted Rongchang County et al. application of Laiwu Iron Co., Ltd., " one kind prevents Al₂O₃Attachment The continuous casting tundish apparatus of mouth of a river wall " (number of patent application 200820016118.3) is introduced, and tundish apparatus is that stopper can be with 0-10 ° of rotation, filling pipe end inner chamber is inverted tubaeform structure, and requires the inner wall roughness of filling pipe end inner chamber in 0-10 microns.

But because the patent does not take measures to the inner surface of filling pipe end top (on aditus laryngis), molten steel is easily adhered at the mouth of a river Inner surface on；And molten steel easily flows to filling pipe end the latter half along filling pipe end wall (in tundish) through aditus laryngis, adds blocking Risk.

In actual production, collector nozzle block due to and air contact, temperature reduce more (especially in the winter time), it is easily stifled Plug, after blocking, change the mouth of a river and bring many inconvenience to STEELMAKING PRODUCTION.Therefore, to prevent nozzle blocking, collector nozzle should be made first Do not contacted directly with molten steel, then filling pipe end carries out respective change again, and molten steel is not flowed down along filling pipe end wall.

In addition, it is more smooth better it is desirable to mouth of a river inwall, but be limited by refractory nozzle and required certain gas in itself Cell size improves mouth of a river thermal shock resistance, therefore is difficult to realize in actual production.

Utility model content

In order to solve the above technical problems, the utility model provides a kind of rare earth steel, Aluminum steel or stainless steel with preventing adhesion Tundish upper nozzle.

The utility model provides a kind of rare earth steel, Aluminum steel or the stainless steel tundish upper nozzle that prevents adhesion, its internal junction Structure includes upper and bottom section, and aditus laryngis forms upper part with upper bit；

The upper part offers 5-100 Argon aperture, a diameter of 1-30mm of Argon aperture, filling pipe end inner surface Normal direction and the angle of the axis direction of Argon aperture are β, and the opening direction of Argon aperture is inclined upwardly, β value model Enclose for 0 °<β<90°；The total flow of Argon aperture argon gas is 1-100l/min；

The bottom of aditus laryngis extends vertically downwards again after vertically making an angle alpha oblique upper extension laterally, shape Into lower part, 90 °<α<180°；

The inside radius of the lower part distance d, 5mm≤d≤100mm bigger than inside radius at aditus laryngis.

Further, the rare earth steel, Aluminum steel or stainless steel with the tundish upper nozzle that prevents adhesion suitable for small billet, big The cast of square billet, round billet, Hot Metal in Beam Blank and slab section.

Relative to prior art, rare earth steel, Aluminum steel or stainless steel provided by the utility model are with preventing adhesion on tundish The mouth of a river has advantages below：

Due to adding one layer of argon gas film between the mouth of a river inner surface and molten steel of the upper part in filling pipe end, and argon gas Flow direction is upward, and on the one hand this design avoids the adhesion phenomenon of mouth of a river inner surface and molten steel, on the other hand due to argon gas Flow up, avoid in molten steel containing bubble so as to be adversely affected to the coagulation band of molten steel.Due to avoiding table in the mouth of a river Face and the adhesion of molten steel, so as to be advantageous to the operation of stopper head and control MOLTEN STEEL FLOW.

Because the α angles that top surface and the vertical direction of the lower part of filling pipe end are formed are more than 90 °, therefore molten steel can not possibly be along upper Mouth of a river top wall flows to filling pipe end bottom through aditus laryngis and continues to flow down.The mouth of a river can carry out rare earth steel, Aluminum steel and stainless steel Cast, and sequence casting can be realized, not block the mouth of a river.Further, since rare earth steel, Aluminum steel and stainless steel do not block water Mouthful, the cast production of permanent pulling rate is realized, this quality to steel is highly beneficial, and very big benefit is also brought to organization of production.

Brief description of the drawings

Rare earth steel, Aluminum steel or the stainless steel that Fig. 1 provides for the utility model embodiment water on the tundish that prevents adhesion The structural representation of mouth.

Description of reference numerals：

1- upper parts

2- lower parts

3- Argon apertures

Embodiment

In order that those skilled in the art more fully understand the utility model, below in conjunction with the accompanying drawings and it is embodied The utility model is described in further detail for mode.

In a kind of specific embodiment, the utility model, which provides a kind of rare earth steel, Aluminum steel or stainless steel and used, to be prevented Adhesion tundish upper nozzle.Fig. 1 is refer to, rare earth steel, the Aluminum steel or not provided the figure shows the utility model embodiment The structure of the rust steel tundish upper nozzle that prevents adhesion.

Rare earth steel that the utility model embodiment provides, Aluminum steel or stainless steel with the tundish upper nozzle that prevents adhesion its in Portion's structure includes upper part 1 and lower part 2, and aditus laryngis forms upper part 1 with upper bit；

The upper part 1 offers 5-100 Argon aperture 3, a diameter of 1-30mm of Argon aperture 3, table in upper part 1 The normal direction OA in the face and axis direction OB of Argon aperture 3 angle is β, and the opening direction of Argon aperture 3 is inclined upwardly, β span is 0 °<β<90°；The total flow of the argon gas of Argon aperture 3 is 1-100l/min；

The bottom of aditus laryngis extends vertically downwards again after vertically making an angle alpha oblique upper extension laterally, shape Into 2,90 ° of lower part<α<180°；

Inside radius the distance d, 5mm≤d≤100mm bigger than inside radius at aditus laryngis of the lower part 2.

Further, above-mentioned rare earth steel, Aluminum steel or stainless steel with the tundish upper nozzle that prevents adhesion suitable for small billet, big The cast of square billet, round billet, Hot Metal in Beam Blank and slab section.

Rare earth steel, Aluminum steel or stainless steel provided by the utility model are applied to cast steel with the tundish upper nozzle that prevents adhesion The steel grade of aluminium content 0~25% (not including 0) and various stainless steels in the steel grade of Rare-Earth Content 0~10% (not including 0), steel Steel grade；The section of cast is：Small billet, bloom, round billet, Hot Metal in Beam Blank and slab.Rare earth steel provided by the utility model, containing aluminium The collector nozzle that steel or stainless steel is reduced with the tundish upper nozzle that prevents adhesion due to making molten steel be not particularly easy to temperature directly contacts, And molten steel is almost not directly contacted with filling pipe end, it is achieved thereby that the cast of rare earth steel, Aluminum steel and stainless steel, and continuous casting connects (including 22 stoves) mouth of a river non-nodulating is poured more than 22 stoves, the steel of rare earth steel, Aluminum steel and stainless steel is improved (mouth of a river does not block, Be advantageously implemented the permanent pulling rate of continuous casting, and permanent pulling rate is very necessary to the quality for improving strand), cost reduces and continuous production is non- Chang Youli.

Specifically cast implementation process is：

(1) molten steel unwraps beginning cast from centre；

(2) steel grade of content of rare earth 0~10%, the steel grade of aluminium content 0~25% or various type of stainless steel；

(3) upper part of filling pipe end has a 5-100 Argon aperture, a diameter of 1-30mm of aperture, upper part inner surface The axis direction OB of normal direction OA and argon blowing hole angle is β and the opening direction of aperture is inclined upwardly, and β span is 0 °~90 °, the total flow of Argon aperture argon gas is 1-100l/min；

(4) the lower part top surface (part of the bottom of aditus laryngis oblique upper extension laterally) of filling pipe end is formed with vertical direction Angle be α；The inside radius of lower part distance d, 5mm≤d≤100mm bigger than inside radius at aditus laryngis.

(5) molten steel is not contacted directly into certain continuous cast mold with the inwall and collector nozzle inwall of filling pipe end lower part.

(6) continuous casting even pours more than 22 stoves (including 22 stoves) mouth of a river non-nodulating (one heat steel production molten steel is smoothly opened and poured, subsequently Molten steel is normally poured into a mould).

Relative to prior art, rare earth steel, Aluminum steel or stainless steel provided by the utility model are with preventing adhesion on tundish The mouth of a river has advantages below：

Due to adding one layer of argon gas film between the mouth of a river inner surface and molten steel of the upper part in filling pipe end, and argon gas Flow direction is upward, and on the one hand this design avoids the adhesion phenomenon of mouth of a river inner surface and molten steel, on the other hand due to argon gas Flow up, avoid in molten steel containing bubble so as to be adversely affected to the coagulation band of molten steel.Due to avoiding table in the mouth of a river Face and the adhesion of molten steel, so as to be advantageous to the operation of stopper head and control MOLTEN STEEL FLOW.

Because the α angles that top surface and the vertical direction of the lower part of filling pipe end are formed are more than 90 °, therefore molten steel can not possibly be along upper Mouth of a river top wall flows to filling pipe end bottom through aditus laryngis and continues to flow down.The mouth of a river can carry out rare earth steel, Aluminum steel and stainless steel Cast, and sequence casting can be realized, not block the mouth of a river.Further, since rare earth steel, Aluminum steel and stainless steel do not block water Mouthful, the cast production of permanent pulling rate is realized, this quality to steel is highly beneficial, and very big benefit is also brought to organization of production.

In order to more fully understand such scheme, citing below is described in detail.

Embodiment 1

(1) ML08Al molten steel unwraps beginning cast from centre；

(2) steel Rare-Earth Content 0.08%, aluminium content 0.05% in steel；

(3) upper part of filling pipe end has 20 Argon apertures, a diameter of 2mm of aperture, the normal side of upper part inner surface Angle to OA and the axis direction OB of argon blowing hole is β and the opening direction of aperture is inclined upwardly, and β span is 30 °, is blown The total flow of argon aperture argon gas is 20l/min；

(4) the lower part top surface of filling pipe end and the angle that vertical direction is formed are 102 °；Filling pipe end bottom inside radius ratio (filling pipe end radius minimum at) inside radius big distance d, d=28mm at filling pipe end aditus laryngis；

(5) molten steel does not contact directly with the inwall and collector nozzle inwall of filling pipe end the latter half crystallizes into continuous small-billet casting Device；

(6) continuous casting even pours 23 stove mouth of a river non-nodulatings (other reasons stop pouring).

Embodiment 2

(1) 50W600 molten steel is unwrapped into beginning cast from centre；

(2) steel Rare-Earth Content 0.2%, aluminium content 0.3% in steel；

(3) upper part of filling pipe end has 35 Argon apertures, a diameter of 5mm of aperture, the normal side of upper part inner surface Angle to OA and the axis direction OB of argon blowing hole is β and the opening direction of aperture is inclined upwardly, and β span is 48 °, is blown The total flow of argon aperture argon gas is 25l/min；

(4) the lower part top surface of filling pipe end and the angle that vertical direction is formed are 107 °；Filling pipe end bottom inside radius ratio (filling pipe end radius minimum at) inside radius big distance d, d=35mm at filling pipe end aditus laryngis；

(5) molten steel does not contact directly with the inwall and collector nozzle inwall of filling pipe end the latter half crystallizes into sheet billet continuous casting Device；

(6) continuous casting even pours 23 stove mouth of a river non-nodulatings (other reasons stop pouring).

Embodiment 3

(1) Q355NH molten steel is unwrapped into beginning cast from centre；

(2) steel Rare-Earth Content 0.09%, aluminium content 0.03% in steel；

(3) upper part of filling pipe end has 45 Argon apertures, a diameter of 6mm of aperture, the normal side of upper part inner surface Angle to OA and the axis direction OB of argon blowing hole is β and the opening direction of aperture is inclined upwardly, and β span is 53 °, is blown The total flow of argon aperture argon gas is 30l/min；

(4) the lower part top surface of filling pipe end and the angle that vertical direction is formed are 109 °；Filling pipe end bottom inside radius ratio (filling pipe end radius minimum at) inside radius big distance d, d=43mm at filling pipe end aditus laryngis；

(5) molten steel does not contact directly with the inwall and collector nozzle inwall of filling pipe end the latter half crystallizes into casting for shaped blank continuous Device；

(6) continuous casting even pours 24 stove mouth of a river non-nodulatings (other reasons stop pouring).

Embodiment 4

(1) 20G molten steel is unwrapped into beginning cast from centre；

(2) steel Rare-Earth Content 0.09%, aluminium content is 0% in steel；

(3) upper part of filling pipe end has 55 Argon apertures, a diameter of 5mm of aperture, the normal side of upper part inner surface Angle to OA and the axis direction OB of argon blowing hole is β and the opening direction of aperture is inclined upwardly, and β span is 58 °, is blown The total flow of argon aperture argon gas is 39l/min；

(4) the lower part top surface of filling pipe end and the angle that vertical direction is formed are 113 °；Filling pipe end bottom inside radius ratio (filling pipe end radius minimum at) inside radius big distance d, d=51mm at filling pipe end aditus laryngis；

(5) molten steel does not contact directly with the inwall and collector nozzle inwall of filling pipe end the latter half crystallizes into round billet continuous casting Device；

(6) continuous casting even pours 23 stove mouth of a river non-nodulatings (other reasons stop pouring).

Embodiment 5

(1) molten steel 409L ferritic stainless steels are unwrapped into beginning cast from centre；

(2) steel grade is 409L ferritic stainless steel steel grades；

(3) upper part of filling pipe end has 40 Argon apertures, a diameter of 5mm of aperture, the normal side of upper part inner surface Angle to OA and the axis direction OB of argon blowing hole is β and the opening direction of aperture is inclined upwardly, and β span is 60 °, is blown The total flow of argon aperture argon gas is 55l/min；

(4) the lower part top surface of filling pipe end and the angle that vertical direction is formed are 126 °；Filling pipe end bottom inside radius ratio (filling pipe end radius minimum at) inside radius big distance d, d=58mm at filling pipe end aditus laryngis；

(5) molten steel does not contact directly with the inwall and collector nozzle inwall of filling pipe end the latter half crystallizes into sheet billet continuous casting Device；

(6) continuous casting even pours 22 stove mouth of a river non-nodulatings (other reasons stop pouring).

Embodiment 6

(1) U71Mn molten steel is unwrapped into beginning cast from centre；

(2) steel Rare-Earth Content 0.06%, aluminium content is 0% in steel；

(3) upper part of filling pipe end has 30 Argon apertures, a diameter of 3mm of aperture, the normal side of upper part inner surface Angle to OA and the axis direction OB of argon blowing hole is β and the opening direction of aperture is inclined upwardly, and β span is 50 °, is blown The total flow of argon aperture argon gas is 65l/min；

(4) the lower part top surface of filling pipe end and the angle that vertical direction is formed are 106 °；Filling pipe end bottom inside radius ratio (filling pipe end radius minimum at) inside radius big distance d, d=56mm at filling pipe end aditus laryngis；

(5) molten steel does not contact directly with the inwall and collector nozzle inwall of filling pipe end the latter half crystallizes into billet continuous casting Device；

(6) continuous casting even pours 23 stove mouth of a river non-nodulatings (other reasons stop pouring).

Rare earth steel provided by the utility model, Aluminum steel or stainless steel are carried out with the tundish upper nozzle that prevents adhesion above It is discussed in detail.Specific case used herein is set forth to principle of the present utility model and embodiment, and the above is real The explanation for applying example is only intended to help and understands method and its core concept of the present utility model.It should be pointed out that led for this technology For the those of ordinary skill in domain, on the premise of the utility model principle is not departed from, if can also be carried out to the utility model Dry to improve and modify, these are improved and modification is also fallen into the protection domain of the utility model claims.

Claims (2)

1. a kind of rare earth steel, Aluminum steel or the stainless steel tundish upper nozzle that prevents adhesion, it is characterised in that its internal structure includes Upper and bottom section, aditus laryngis form upper part with upper bit；

The upper part offers 5-100 Argon aperture, a diameter of 1-30mm of Argon aperture, the normal of filling pipe end inner surface Direction and the angle of the axis direction of Argon aperture are β, and the opening direction of Argon aperture is inclined upwardly, and β span is 0°<β<90°；The total flow of Argon aperture argon gas is 1-100l/min；

The bottom of aditus laryngis extends vertically downwards again after vertically making an angle alpha oblique upper extension laterally, under formation Part, 90 °<α<180°；

The inside radius of the lower part distance d, 5mm≤d≤100mm bigger than inside radius at aditus laryngis.

2. rare earth steel according to claim 1, Aluminum steel or the stainless steel tundish upper nozzle that prevents adhesion, its feature exist In it is applied to the cast of small billet, bloom, round billet, Hot Metal in Beam Blank and slab section.