CN201257513Y

CN201257513Y - Tundish breathable upper nozzle

Info

Publication number: CN201257513Y
Application number: CNU2008201260275U
Authority: CN
Inventors: 李有奇; 丰文祥; 寇志奇; 赵继增; 毛晓刚; 李洪波; 孔祥魁; 谢保卫
Original assignee: SHANGHAI LIRR REFRACTORY CO Ltd; Beijing Lier High Temperature Materials Co Ltd; Luoyang Lier Refractory Materials Co Ltd
Current assignee: SHANGHAI LIRR REFRACTORY CO Ltd; Beijing Lier High Temperature Materials Co Ltd; Luoyang Lier Refractory Materials Co Ltd
Priority date: 2008-06-20
Filing date: 2008-06-20
Publication date: 2009-06-17
Anticipated expiration: 2018-06-20

Abstract

The utility model discloses a ventilate filling water gap for a continuous casting tundish and a preparation method thereof. The water gap is mainly characterized by comprising an internal ventilate core body and an external dense article made of fireproof material, wherein the ventilate core body has larger porosity and favorable ventilation property and is formed through mechanical pressure, the dense article is formed through casting vibration and takes an airtight effect, and a gap-type air chamber made of combustible substances is arranged between the ventilate core body and the dense article and is connected with an external argon gas input device through a metal conduit. The utility model has the advantages of simple production technology and low production cost due to the improved structure; the external dense article adopts a self-tightness airtight mode to save the technology for wrapping a steel casing outside the water gap, and the favorable self-tightness property can ensure the flow and the back pressure of gas to be stable in a blowing process so as to have better effect of preventing non-metal impurities in molten steel from sticking and depositing.

Description

A kind of tundish ventilating filling pipe end

Technical field

The present invention relates to the filling pipe end of a kind of steel-making continuous casting tundish, particularly by being blown into the tundish ventilating filling pipe end that inert gas prevents that the steel inclusion deposition from stopping up with control steel stream.

Background technology

The mouth of a river is an important component part of steel-making continuous casting tundish, and in continuous casting was produced, the non-metallic inclusion in the molten steel was as Al ₂O ₃, SiO ₂With CaO etc., can produce and stop up in position, mouth of a river deposition, failure is watered by the company of causing, thereby has a strong impact on carrying out smoothly of continuous casting operation.In order to prevent Al ₂O ₃The service life of adhering to and stopping up and improve the mouth of a river Deng non-metallic inclusion, the current measure of mainly taking comprises: employing can jet inert gas ventilating filling pipe end, change gate structure, change mouth of a river material and improve the molten steel cleanliness factor, improve field trash state etc., wherein adopting the ventilating filling pipe end of the inert gas of can jetting is the most direct and cost-effective solution.

The gas-permeable nozzle of present industrial use such as mostly is at the static pressure global formation, and the patent No. is that the mouth of a river of bibliographical informations such as CN 1530193A, CN1726106, CN 2601764Y, CN 2609687Y all is the product that adopts this explained hereafter.This production technology has a series of shortcoming: the equal pressing equipment of this arts demand costliness of one side, and early investment is higher; On the other hand, isostatic compaction productivity ratio is comparatively low; Moreover, the both sides institutional framework was close inside and outside the steel hole was watered at the mouth of a river of this explained hereafter, it all is ventilative position, gas leaks in the use of the mouth of a river, must carry out Baogang's casing tech operation to mouth of a river integral body, thereby having increased complexity and the degree of difficulty and the production cost at the sealing mouth of a river, on-the-spot use result also shows the whole gas-permeable nozzle of this explained hereafter, and in use air-tightness is relatively poor; In addition,, cause the air pressure and the instability of flow of flowing gas in the mouth of a river, thereby do not have in effective inhibition molten steel field trash in the effect of mouth of a river surface adhesion and deposition because ventilative position, the mouth of a river of this explained hereafter area is bigger.

In order to improve the negative effect that the whole isostatic compaction in the mouth of a river is brought, the researcher improves gas-permeable nozzle from configuration aspects.The patent No. is that patent documentations such as CN 1203543A, CN 2928316Y, CN 2790636Y and CN 1694774A have been reported the gas-permeable nozzle that adopts the multi-part compound mode to produce, the different parts of this invention at the mouth of a river uses different materials to make each parts, then each parts made up.With respect to waiting static pressure integral forming technique, this technology has more reasonably been brought into play the effect of unlike material refractory material, and some parts at the combination mouth of a river can be taked to press or the mode of static pressure such as cast etc. is non-is produced as machine, thus do not influence or the less prerequisite that influences the product result of use under reduced the cost of product.But these technologies also have some comparatively significant disadvantages respectively: the combiner of some technology is more, is combined by the parts more than three even three, and this has brought bigger difficulty for the implementation process of producing; Some arts demand is inner at the mouth of a river installs long metal breather line, the explained hereafter trouble and owing to the expansion inconsistency of metal and refractory material can cause life-span or the air-tightness that crackle influences the mouth of a river appears in inside, the mouth of a river in the use; Because assembly is too much, in order to prevent gas leakage, most technology is still taked the means of whole Baogang shell or part Baogang shell; The air blowing position of some technology gas-permeable nozzles design is comparatively unreasonable or the air blowing position is less, and the effect that causes blowing is relatively poor, especially in reducing mouth of a river bottom hole aspect the adhesion of field trash and the deposition effect relatively poor.In a word, because above-mentioned a variety of causes adopts the gas-permeable nozzle of combined type production not obtain large-scale promotion and application in smelting iron and steel industry.

Summary of the invention

In order to overcome the different defectives that above-mentioned technology has, the present invention aims to provide that a kind of moulding process is simple, air permeable effect good, production cost is comparatively cheap, adopt and prevent in self-packing air tight manner, the use that the tangible continuous casting tundish of field trash deposition effect is with combination ventilating filling pipe end and preparation method thereof.

The technical measures that the present invention takes are: related tundish adopts the mode of inner ventilative core and outside fine and close part combination to be processed to form with ventilating filling pipe end, it is made of inside and outside two parts, inside is that the porosity is big, even aperture distribution, the good ventilative core body of mechanical pressing of permeability, and the raw material of ventilative core body is mainly comparatively high-grade zirconia material and the corundum material of containing; Outside for to take to pour into a mould the little fine and close pouring piece of compact structure, the porosity of vibration moulding, the raw material of outside fine and close part is mainly the more cheap a little corundum matter of price, chrome corundum or corundum spinelle material.Between inside and outside ventilative core body and fine and close part two parts is the clearance type air chamber, the formation method of air chamber is for twining or smear the combustibles of a layer thickness less than 3mm in ventilative core body outside, then in casting process and fine and close part form as a whole, combustibles after-flame in 1300 ℃～1650 ℃ high-temperature process and forming.Air chamber is connected with extraneous argon gas input unit by metallic conduit.Connect and sealing by chamotte between metallic conduit and the outside fine and close part.

Ventilative core body of the present invention partly has the high ventilation performance, and fine and close part partly has good air-tightness; Because self-packing air tight manner has been adopted at the mouth of a river, so saved the production cost that the box hat sealing is adopted at traditional mouth of a river; Because ventilative core body independently is embedded in inside, the mouth of a river, therefore the inert gas that is blown into is shorter in mouth of a river internal end of travel, has guaranteed the stability of gas flow and back pressure in the air blowing process; Whole gas-permeable nozzle has thermal shock resistance and anti-molten steel scouring performance preferably, and the opposing field trash sticks good and manufacture craft is simple with deposition effect.

Description of drawings

Fig. 1 is a kind of structural representation of the present utility model.

The ventilative core body of 1-among the figure, the fine and close part of 2-, 3-metallic conduit, 4-air chamber, 5-chamotte

The specific embodiment

The present invention is described in detail below in conjunction with accompanying drawing and embodiment.

Ventilative core body 1 is a key position of the present invention among the figure, and it is arranged in mouth of a river intersegmental part, and ring waters the steel hole and places, and is embedded in the inside of outside fine and close part 2.Ventilative core body 1 be a mechanical pressing spare, and the raw material that is adopted mainly contains zirconium material, corundum material and bond that some are suitable, has bigger apparent porosity and uniform pore-size distribution, and permeability is good, and intensity is bigger.Above-mentioned effect mainly reaches by the grain composition of adjusting different material and the method for adding some special components.

2 is fine and close part among the figure, and material is corundum matter, chrome corundum or corundum spinel refractory materials, adopts the mode moulding of vibrating casting.In forming process, at first twine or smear the combustibles of a layer thickness less than 3mm in the periphery of ventilative core body 1, the core body 1 of will breathing freely then is installed to the mould inside of fine and close part 2 in advance, fix after the ventilative core body 1, begin fine and close part 2 is carried out moulding by casting, ventilative core body 1 is as a whole with 2 one-tenth of outside fine and close parts after the moulding.Burn till after cast community's process maintenance drying well, firing temperature is 1300 ℃～1650 ℃.After burning till, because the combustibles after-flame forms slot-shaped air chamber between ventilative core body 1 and fine and close part 2.For guaranteeing that ventilative core body 1 and fine and close part 2 have good binding, can on the contact-making surface up and down of ventilative core body and outside pouring piece, form double buckle and connect.

Metallic conduit 3 burns till at fine and close part and finishes to install later among the figure, connects the integral body that makes it to constitute good seal by chamotte between pipeline 3 and the fine and close part 2.

The utility model uses on certain 18 tons of square billet tundish at home, be 900 minutes service time the highest, intact substantially with the ventilative core body 1 in back, there is not tangible erosion, there is not tangible field trash to stick to the inner surface of ventilative core body 1 yet, show that its anti-molten steel scouring is functional, and have good opposing field trash and stick and deposition effect; The steel phenomenon is not oozed at the position that combines between the higher and lower levels between ventilative core body 1 and the fine and close part 2; In use gas flow and back pressure are stable, show that fine and close part 2 air-tightness are good.

Claims

1, a kind of tundish ventilating filling pipe end is characterized in that the mouth of a river is made of ventilative core in inside and outside fine and close part, and ventilative core is embedded in the middle part of fine and close part; Have the clearance type air chamber between ventilative core and the outside fine and close part; Ventilative core is connected by the argon gas device for blowing of metallic conduit and outside, the mouth of a river; Connect by chamotte between the metallic conduit and the mouth of a river.

2, tundish ventilating filling pipe end according to claim 1, the core body that it is characterized in that breathing freely is taked mechanical pressing, and raw material is to contain zirconia material and corundum material.

3, tundish ventilating filling pipe end according to claim 1 is characterized in that outside fine and close part adopts the vibrating casting moulding, and material is corundum matter, chrome corundum or corundum spinel.