CN104032097A - Inserting pipe used for vacuum circulating degasification furnace and manufacturing method of inserting pipe - Google Patents

Inserting pipe used for vacuum circulating degasification furnace and manufacturing method of inserting pipe Download PDF

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Publication number
CN104032097A
CN104032097A CN201410311832.5A CN201410311832A CN104032097A CN 104032097 A CN104032097 A CN 104032097A CN 201410311832 A CN201410311832 A CN 201410311832A CN 104032097 A CN104032097 A CN 104032097A
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parts
upper layer
vacuum
layer
pouring layer
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CN104032097B (en
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李龙
杨大刚
陈永
张强
曾建华
王建
戈文荪
李扬洲
杨森祥
童贤强
李平凡
杜利华
王军
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to an inserting pipe used for a vacuum circulating degasification furnace and a manufacturing method of the inserting pipe, and belongs to the field of external refining of metallurgical production. The inserting pipe comprises a cylindrical steel structure, fire-resistant bricks stacked on the inner wall of the steel structure and a casting layer formed on the outer wall of the steel structure. The casting layer comprises a lower casting layer and an upper casting layer, wherein the upper casting layer and the lower casting layer make contact with each other, the upper casting layer makes contact with slag in a vacuum circulating degasification refining process, the lower casting layer makes contact with liquid steel in the vacuum circulating degasification refining process, the outer diameter of the lower casting layer is smaller than that of the upper casting layer, and a T-shaped structure is formed. Moreover, ingredients of casting materials of the lower casting layer comprise ZrO2 and TiO2, wherein the input amount of the ZrO2 accounts for two percent to five percent of the total weight of the casting materials of the lower casting layer, and the input amount of the TiO2 accounts for two percent to eight percent of the total weight of the casting materials of the lower casting layer. According to the inserting pipe and the manufacturing method of the inserting pipe, the outer diameter of the lower casting layer is smaller than that of the upper casting layer, and the T-shaped structure is formed, so that bonded slag making contact with the liquid steel of the casting materials is basically eliminated, and the removed slag amount is reduced.

Description

A kind of insert pipe for vacuum circulation degassing furnaces and preparation method thereof
Technical field
The present invention relates to a kind of insert pipe for vacuum circulation degassing furnaces and preparation method thereof, belong to the external refining field of metallurgical production.
Background technology
Nineteen fifty-seven Thyssen Iron And Steel Company invention vacuum circulation degassing-RH method, the seventies subsequently and the eighties, Japan has successively developed RH-OB method, RH-KTB method and RH-PB method, constantly improves the refining function of RH.Along with market the cleanliness factor of steel is required more and more higher, simultaneously to high-quality steel demand increase, domestic and international most steel mills have all configured RH a refining unit.In refining process, the outer mould material of RH tubular stinger, owing to bearing the washing away of high-temperature molten steel, the erosion of slag and the thermal shocking of rapid heat cycle, easily causes mould material generation melting loss and peels off.And after RH processing finishes, slag drips from the top down along mould material, along with temperature reduces, a part of slag just sticks to mould material surface, and must carry out scarfing cinder could spray repair.Like this, increase the scarfing cinder time on the one hand, the more important thing is that tubular stinger temperature loss is large, directly affect spray repair effect, cause the work-ing life of RH tubular stinger and production efficiency on the low side.
Patent CN102503449A is poor in order to solve existing mould material anti-scour property and heat-shock resistance, the serious problem of resistance to material dross, propose a kind of compound and additive that comprises aggregate and substrate material composition, in described substrate material, containing weight percent is 7.5-23.5%SiC.Patent CN101475385 is different from the corundum pouring material using at present, provides a kind of mould material of electric fused zirconium corundum matter for tubular stinger, has effectively improved anti-slag and has invaded and permeate, but had the problem of high expensive.Patent CN201110441219.1 introduces compact alumina, has developed a kind of RH vacuum oven tubular stinger corundum pouring material of non-cement combination, and work-ing life, cost increased to some extent than existing mould material 80 left and right.
In addition, in RH treating processes, the mould material contacting with slag easily occurs to corrode or dry slag, the method that reduces at present dry slag mainly contains 1, coating processing (patent CN200610018622), specifically adopt coating that slag is not directly contacted with mould material, reach and reduce the object of dry slag, but in treating processes, because slag has limited to the erosion of coating the ability that it suppresses dry slag.2, residue adjustment processing (patent CN101307375), is to process the later stage at RH to carry out slag modification, reduces the viscosity of slag, thereby makes slag be difficult for sticking on tubular stinger, but can make the erosion of mould material and ladle liner aggravate.The clinker removal method of dry slag on tubular stinger is mainly adopted to mechanical doctor (patent CN200620098887.3, patent CN200820076256.0 etc.), but owing to there being cold steel in dry slag, mechanical removal is easy to make mould material to damage, and the treatment time is long, temperature drop is large, affect spray repair effect, greatly reduce work-ing life.
Summary of the invention
The present invention is directed to above-mentioned defect, a kind of insert pipe for vacuum circulation degassing furnaces is provided, gained tubular stinger is T-shaped structure, T-shaped structure basically eliminate contacts the dry slag of mould material (lower pouring layer) with molten steel, dry slag is few, and anti-erosion shortens the scarfing cinder time greatly, reduce temperature drop, improve spray repair effect and long service life; In addition, in the composition of lower pouring layer of the present invention, comprise ZrO 2and TiO 2; Utilize ZrO 2and TiO 2fine powder can improve hot strength and the thermal shock resistance of lower pouring layer.
Technical scheme of the present invention:
The invention provides a kind of insert pipe for vacuum circulation degassing furnaces, described tubular stinger comprises tubular steel construction, builds the refractory brick on described steel construction inwall by laying bricks or stones and be formed on the pouring layer on steel construction outer wall, described pouring layer comprises the lower pouring layer and the upper layer that contact with each other, wherein, described upper layer contacts with slag in the time carrying out vacuum circulation degassing refining, described lower pouring layer contacts with molten steel in the time carrying out vacuum circulation degassing refining, lower pouring layer external diameter is less than the external diameter of upper layer, thereby forms T-shaped structure; And, in the composition of described lower pouring layer mould material, comprise ZrO 2and TiO 2, ZrO 2add-on account for the 2-5% of lower pouring layer mould material gross weight, TiO 2add-on account for the 2-8% of lower pouring layer mould material gross weight.
Preferably, lower pouring layer external diameter is less than upper layer external diameter 5-20cm, preferably 5-10cm.
Preferably, ZrO 2particle diameter be 20 μ m～90 μ m, TiO 2particle diameter is 20 μ m～70 μ m.
Preferably, in above-mentioned insert pipe for vacuum circulation degassing furnaces, in described upper layer mould material composition, comprise ZrB 2and zircon; Wherein, ZrB 2add-on account for the 2-5% of upper layer mould material gross weight, the add-on of zircon accounts for the 3-8% of upper layer mould material gross weight.
Preferably, ZrB 2particle diameter be 20 μ m～90 μ m, zircon particle diameter is 20 μ m～90 μ m.
Further, described lower pouring layer mould material composition and parts by weight thereof are: 16～20 parts of 5mm～10mm white fused aluminas, 20～25 parts of 3mm～5mm white fused aluminas, 23～28 parts of 0mm～3mm white fused aluminas, be less than 20～25 parts of 0.074mm white fused alumina fine powders, 4～8 parts of Alpha-alumina micro mists, 2～4 parts of silicon powders, 1.0～2.0 parts, tackiness agent, ZrO 22～5 parts, TiO 22～8 parts, water reducer 0.1-0.3 part (being preferably 0.2), 1.0～1.5 parts of Stainless Steel Fibres;
Described upper layer mould material composition is: 17～20 parts of 5mm～8mm white fused aluminas, 20～25 parts of 3mm～5mm white fused aluminas, 20～28 parts of 0mm～3mm white fused aluminas, be less than 18～25 parts of 0.074mm white fused alumina fine powders, 4～8 parts of Alpha-alumina micro mists, 2.0～4.0 parts of silicon powders, 1.5～2.0 parts, tackiness agent, ZrB 22.0～5.0 parts, 3.0～8.0 parts of zircons, water reducer 0.1-0.3 part, 1.0～1.5 parts of Stainless Steel Fibres.
In the present invention, water reducer is at least one in poly-phosphate, poly carboxylic acid or dispersed alumina series high-efficiency water-reducing agent; Tackiness agent is aluminous cement or hydrated aluminum oxide micro mist.
The present invention also provides the preparation method of above-mentioned insert pipe for vacuum circulation degassing furnaces, comprises step:
Form tubular steel construction, on described steel construction inwall, build refractory brick by laying bricks or stones, form the upper layer and the lower pouring layer that contact with each other at steel construction outer wall upper; Wherein, described upper layer contacts with slag in the time carrying out vacuum circulation degassing refining, and described lower pouring layer contacts with molten steel in the time carrying out vacuum circulation degassing refining, and lower pouring layer external diameter is less than upper layer, thereby forms T-shaped structure.
Further, in the preparation method of above-mentioned insert pipe for vacuum circulation degassing furnaces, the lower pouring layer that described formation contacts with each other and the step of upper layer are:
1) prepare burden according to the composition of upper layer and lower pouring layer, be formed for the first compound of lower pouring layer and the second compound for upper layer;
2) the first compound is carried out mixing for the first time, then add carry out after 6～7% the water that accounts for the first compound weight mixing for the second time; The second compound is carried out mixing for the first time, then add carry out after 6～7% the water that accounts for the second compound weight mixing for the second time;
3) use T-shaped die casting to form lower pouring layer and upper layer, and cast time vibration.
Preferably, mixing and mixing time is 5-10min for the second time for the first time.
A kind of vacuum refining furnace, comprise for the vacuum tank of molten steel metallurgical reaction, for the vacuum system of power is provided to described vacuum tank, and be arranged on the insert pipe for vacuum circulation degassing furnaces of described vacuum tank below, the T-shaped tubular stinger that described insert pipe for vacuum circulation degassing furnaces is gained of the present invention.
Beneficial effect of the present invention:
In prior art, vacuum degassing furnace is substantially close with additive in the mould material in tubular stinger, and shape is cylindrical.Be less than and contact pouring layer (upper layer) with slag and employing of the present invention contacts pouring layer (lower pouring layer) external diameter with molten steel, thereby form T-shaped structure tubular stinger, T-shaped structure basically eliminate contacts the dry slag of mould material with molten steel, reduce scarfing cinder amount, greatly shorten the scarfing cinder time, reduce temperature drop, improve spray repair effect.In addition, the present invention adds ZrB in the mould material of upper layer 2with zircon fine powder, utilize ZrB 2(zirconium boride 99.5004323A8ure) and zircon fine powder improve hot strength and the slag resistance of slag lining mould material; In the composition of lower pouring layer, comprise ZrO 2and TiO 2; Utilize ZrO 2and TiO 2fine powder can improve hot strength and the thermal shock resistance of lower pouring layer.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment of the present invention vacuum degassing furnace tubular stinger.Wherein, 1-flange, 2-steel construction, 3-ram's horn, 4-ram's horn, 5-Mg-Cr brick, 6-contacts pouring layer with slag, and 7-contacts pouring layer with molten steel.
Embodiment
The invention provides a kind of insert pipe for vacuum circulation degassing furnaces, described tubular stinger comprises tubular steel construction, builds the refractory brick on described steel construction inwall by laying bricks or stones and be formed on the pouring layer on steel construction outer wall, described pouring layer comprises the lower pouring layer and the upper layer that contact with each other, wherein, described upper layer contacts with slag in the time carrying out vacuum circulation degassing refining, described lower pouring layer contacts with molten steel in the time carrying out vacuum circulation degassing refining, lower pouring layer external diameter is less than upper layer, thereby forms T-shaped structure; And, in the composition of described lower pouring layer mould material, comprise ZrO 2and TiO 2; ZrO 2add-on account for the 2-5% of lower pouring layer mould material gross weight, TiO 2add-on account for the 2-8% of lower pouring layer mould material gross weight.
ZrO 2particle diameter be 20 μ m～90 μ m, TiO 2particle diameter is 20 μ m～70 μ m.The meticulous powder of granularity is difficult to economic acquisition, and excessive its raising to intensity and anti-seismic performance of granularity is limited.
The T-shaped structure basically eliminate that the present invention forms contacts the dry slag of mould material with molten steel, reduce scarfing cinder amount, greatly shortens the scarfing cinder time, reduces temperature drop, improves spray repair effect; Utilize ZrO 2and TiO 2fine powder can improve hot strength and the thermal shock resistance of lower pouring layer.
Preferably, in above-mentioned insert pipe for vacuum circulation degassing furnaces, in described upper layer mould material composition, comprise ZrB 2and zircon; Utilize ZrB 2(zirconium boride 99.5004323A8ure) promotes the sintering of mould material matrix, thereby improves hot strength; Zircon fine powder reacts with the CaO in slag and forms infiltration and the melting loss that high-melting-point phase CaZrO3 suppresses slag, meanwhile ZrB 2have good slag resistance, both are in conjunction with the slag resistance that improves mould material.In the present invention, the existing mould material of preparing insert pipe for vacuum circulation degassing furnaces all can be used, and just in the mould material of lower pouring layer, adds ZrB 2form upper layer with zircon.
Preferably, ZrB 2particle diameter be 20 μ m～90 μ m, zircon powder footpath is 20 μ m～90 μ m; The meticulous powder of granularity is difficult to economic acquisition, and granularity is excessive, and it is limited to intensity and erosion-resistant raising.
In the present invention, upper layer mould material is to add ZrB in the mould material using in prior art 2and zircon, lower pouring layer mould material is to add ZrO in the mould material using in prior art 2and TiO 2, be not limited in the mould material that the pouring layer up and down in embodiment uses.
Further, described lower pouring layer mould material composition and parts by weight thereof are: 16～20 parts of 5mm～10mm white fused aluminas, 20～25 parts of 3mm～5mm white fused aluminas, 23～28 parts of 0mm～3mm white fused aluminas, be less than 20～25 parts of 0.074mm white fused alumina fine powders, 4～8 parts of Alpha-alumina micro mists, 2～4 parts of silicon powders, 1.0～2.0 parts, tackiness agent, ZrO 22～5 parts, TiO 22～8 parts, water reducer 0.1-0.3 part (being preferably 0.2), 1.0～1.5 parts of Stainless Steel Fibres;
Described upper layer mould material composition is: 17～20 parts of 5mm～8mm white fused aluminas, 20～25 parts of 3mm～5mm white fused aluminas, 20～28 parts of 0mm～3mm white fused aluminas, be less than 18～25 parts of 0.074mm white fused alumina fine powders, 4～8 parts of Alpha-alumina micro mists, 2.0～4.0 parts of silicon powders, 1.5～2.0 parts, tackiness agent, ZrB 22.0～5.0 parts, 3.0～8.0 parts of zircons, water reducer 0.1-0.3 part, 1.0～1.5 parts of Stainless Steel Fibres.
The present invention also provides the preparation method of above-mentioned insert pipe for vacuum circulation degassing furnaces, comprises step:
Form tubular steel construction, on described steel construction inwall, build refractory brick by laying bricks or stones, form the upper layer and the lower pouring layer that contact with each other at steel construction outer wall upper; Wherein, step, described upper layer does not contact (contacting with slag) in the time carrying out vacuum circulation degassing refining with molten steel, and described lower pouring layer contacts with molten steel in the time carrying out vacuum circulation degassing refining, lower pouring layer external diameter is less than upper layer, thereby forms T-shaped structure.
Further, in the preparation method of above-mentioned insert pipe for vacuum circulation degassing furnaces, the lower pouring layer that described formation contacts with each other and the step of upper layer are:
1) prepare burden according to the composition of upper layer and lower pouring layer, be formed for the first compound of lower pouring layer and the second compound for upper layer;
2) the first compound is carried out mixing for the first time, then add carry out after 6～7% the water that accounts for the first compound weight mixing for the second time; The second compound is carried out mixing for the first time, then add carry out after 6～7% the water that accounts for the second compound weight mixing for the second time;
3) use T-shaped die casting to form lower pouring layer and upper layer, and cast time vibration.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
In the present invention, connect and maintenance for convenient, the top of tubular structure can be provided with flange 1, be combined securely with tubular steel construction in order to make to pour into a mould the bed of material in addition, on the outer wall of tubular steel construction, can be provided with the ram's horn 3,4 along different directions, ram's horn material can be 20g reinforcing bar, and length can be 60-70mm; As shown in Figure 1.
This embodiment tubular stinger structure as shown in Figure 1, comprising: steel construction 2, flange 1, ram's horn 3,4, Mg-Cr brick 5, upper layer (pouring layer contacting with slag) 6, lower pouring layer (pouring layer contacting with molten steel) 7.
The material of tubular stinger steel construction 1 adopts 20g reinforcing bar, thickness 25～30mm.Adopt ram's horn 3 with slag contact site, material is 20g reinforcing bar, and long 60～70mm, is distributed in steel structure surface by certain angle; With molten steel contact site adopt ram's horn 3,4, by certain angle mixed distribution at steel structure surface; Magnesia chrome brick 5 is built by laying bricks or stones on steel construction inside, magnesia chrome brick Cr 2o 3content 24wt%～30wt%; On steel construction outer wall for base material is the note layer that aluminum oxide waters.
Pouring layer is taking aluminum oxide as base material, concrete, and pouring layer is prepared burden by following component:
(1) contact the weight part composition of mould material (lower pouring layer 7) with molten steel
5mm～10mm white fused alumina accounts for 16～20 parts, and 3mm～5mm white fused alumina accounts for 20～25 parts, and 0mm～3mm white fused alumina accounts for 23～28 parts, be less than 0.074mm white fused alumina fine powder and account for 20～25 parts, Alpha-alumina micro mist accounts for 4～8 parts, and silicon powder accounts for 2～4 parts, 70 trade mark aluminous cements account for 1.0～2.0 parts, ZrO 2fine powder accounts for 2.0～5.0 parts, TiO 2fine powder accounts for 2.0～8.0 parts, 0.1～0.3 part of additional water reducer, 1.0～1.5 parts of Stainless Steel Fibres;
(2) the weight part composition of the mould material (upper layer 6) contacting with slag
5mm～8mm white fused alumina accounts for 17～20 parts, 3mm～5mm white fused alumina accounts for 20～25 parts, 0mm～3mm white fused alumina accounts for 20～28 parts, be less than 0.074mm white fused alumina fine powder and account for 18～25 parts, Alpha-alumina micro mist accounts for 4～8 parts, silicon powder accounts for 2.0～4.0 parts, and 70 trade mark aluminous cements account for 1.5～2.0 parts, ZrB 2fine powder accounts for 2.0～5.0 parts, and zircon fine powder accounts for 3.0～8.0 parts, 0.1～0.3 part of additional water reducer, 1.0～1.5 parts of Stainless Steel Fibres;
Wherein white fused alumina chemical composition meets (wt%): Al 2o 3>=98, SiO 2< 0.5, FeO < 0.5; ZrB 2fine powder particle diameter is between 20 μ m～90 μ m, and zircon fine powder particle diameter is between 20 μ m～90 μ m.
Before cast, prepare burden by above-mentioned (1) and with (2) respectively, then take successively appropriate batching (1) and batching (2), the 5～10min that mixes respectively, the water that adds 6～7wt% mixes 5～10min.When cast, first mixed batching (1) is poured in T-shaped mould, after vibration 30s, poured into mixed batching (2), vibration 2min～3min moulding; The demoulding after 24h, maintenance 24h～48h, toasts online 24h after being dried and obtains T-shaped structure tubular stinger.The tubular stinger of this structure can reduce the dry slag amount of mould material and the slag of slag lining is invaded, and greatly shortens the scarfing cinder time, improves spray repair effect, and reach more than 90 times the work-ing life of tubular stinger.
In addition can adjust mould material composition and grain size distribution in above-described embodiment.For example, white fused alumina also can use compact alumina powder to replace, and aluminous cement, as bonding agent, also can adopt hydrated aluminum oxide micro mist to substitute.
Although described the present invention above in conjunction with the embodiments, it will be apparent to those skilled in the art that the spirit and scope in the case of not departing from claim, can carry out various amendments to above-described embodiment.

Claims (10)

1. an insert pipe for vacuum circulation degassing furnaces, described tubular stinger comprises tubular steel construction, builds the refractory brick on described steel construction inwall by laying bricks or stones and be formed on the pouring layer on steel construction outer wall, described pouring layer comprises the upper layer and the lower pouring layer that contact with each other, it is characterized in that, described upper layer contacts with slag in the time carrying out vacuum circulation degassing refining, described lower pouring layer contacts with molten steel in the time carrying out vacuum circulation degassing refining, the external diameter of lower pouring layer is less than the external diameter of upper layer, thereby forms T-shaped structure; And, in the composition of described lower pouring layer mould material, comprise ZrO 2and TiO 2, wherein, ZrO 2add-on account for the 2-5% of lower pouring layer mould material gross weight, TiO 2add-on account for the 2-8% of lower pouring layer mould material gross weight.
2. insert pipe for vacuum circulation degassing furnaces according to claim 1, is characterized in that, lower pouring layer external diameter is less than upper layer external diameter 5-20cm.
3. insert pipe for vacuum circulation degassing furnaces according to claim 1 and 2, is characterized in that, ZrO 2particle diameter be 20 μ m～90 μ m, TiO 2particle diameter is 20 μ m～70 μ m.
4. according to the insert pipe for vacuum circulation degassing furnaces described in claim 1～3 any one, it is characterized in that, in described upper layer mould material composition, comprise ZrB 2and zircon, wherein, ZrB 2add-on account for the 2-5% of upper layer mould material gross weight, the add-on of zircon accounts for the 3-8% of upper layer mould material gross weight.
5. according to the insert pipe for vacuum circulation degassing furnaces described in claim 1～4 any one, it is characterized in that,
Described upper layer mould material composition is: 17～20 parts of 5mm～8mm white fused aluminas, 20～25 parts of 3mm～5mm white fused aluminas, 20～28 parts of 0mm～3mm white fused aluminas, be less than 18～25 parts of 0.074mm white fused alumina fine powders, 4～8 parts of Alpha-alumina micro mists, 2.0～4.0 parts of silicon powders, 1.5～2.0 parts, tackiness agent, ZrB 22.0～5.0 parts, 3.0～8.0 parts of zircons, water reducer 0.1-0.3 part, 1.0～1.5 parts of Stainless Steel Fibres;
Described lower pouring layer mould material composition and parts by weight thereof are: 16～20 parts of 5mm～10mm white fused aluminas, 20～25 parts of 3mm～5mm white fused aluminas, 23～28 parts of 0mm～3mm white fused aluminas, be less than 20～25 parts of 0.074mm white fused alumina fine powders, 4～8 parts of Alpha-alumina micro mists, 2～4 parts of silicon powders, 1.0～2.0 parts, tackiness agent, ZrO 22～5 parts, TiO 22～8 parts, 0.1～0.3 part of water reducer, 1.0～1.5 parts of Stainless Steel Fibres.
6. the preparation method of the insert pipe for vacuum circulation degassing furnaces described in claim 1～5 any one, comprises step:
Form tubular steel construction;
On described steel construction inwall, build refractory brick by laying bricks or stones;
Form the upper layer and the lower pouring layer that contact with each other at steel construction outer wall upper;
It is characterized in that, described upper layer contacts with slag in the time carrying out vacuum circulation degassing refining, and described lower pouring layer contacts with molten steel in the time carrying out vacuum circulation degassing refining, and lower pouring layer external diameter is less than upper layer external diameter, thereby forms T-shaped structure.
7. the preparation method of insert pipe for vacuum circulation degassing furnaces according to claim 6, is characterized in that, the lower pouring layer that described formation contacts with each other and the step of upper layer are:
1) prepare burden according to the mould material composition of upper layer and lower pouring layer, be formed for the first compound of lower pouring layer and the second compound for upper layer;
2) the first compound is carried out mixing for the first time, then add carry out after 6～7% the water that accounts for the first compound weight mixing for the second time; The second compound is carried out mixing for the first time, then add carry out after 6～7% the water that accounts for the second compound weight mixing for the second time;
3) use T-shaped die casting to form lower pouring layer and upper layer, and cast time vibration.
8. the preparation method of insert pipe for vacuum circulation degassing furnaces according to claim 7, is characterized in that, mixing and mixing time is 5-10min for the second time for the first time.
9. vacuum refining furnace, comprise for the vacuum tank of molten steel metallurgical reaction, for the vacuum system of power is provided to described vacuum tank, and be arranged on the tubular stinger of described vacuum tank below, it is characterized in that, described tubular stinger is the insert pipe for vacuum circulation degassing furnaces described in claim 1～5 any one.
10. vacuum refining furnace, comprise for the vacuum tank of molten steel metallurgical reaction, for the vacuum system of power is provided to described vacuum tank, and be arranged on the tubular stinger of described vacuum tank below, it is characterized in that, described tubular stinger is the insert pipe for vacuum circulation degassing furnaces that the preparation method described in claim 6～8 any one makes.
CN201410311832.5A 2014-07-02 2014-07-02 A kind of insert pipe for vacuum circulation degassing furnaces and preparation method thereof Active CN104032097B (en)

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