CN101614482B - Reducing gas injecting pipe for RH refining furnace dipping pipe and fabricating method thereof - Google Patents
Reducing gas injecting pipe for RH refining furnace dipping pipe and fabricating method thereof Download PDFInfo
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- CN101614482B CN101614482B CN2009100174040A CN200910017404A CN101614482B CN 101614482 B CN101614482 B CN 101614482B CN 2009100174040 A CN2009100174040 A CN 2009100174040A CN 200910017404 A CN200910017404 A CN 200910017404A CN 101614482 B CN101614482 B CN 101614482B
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- tubule
- gas injection
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Abstract
The invention relates to a reducing gas injecting pipe for a refining furnace dipping pipe and a fabricating method thereof, which belong to the technical field of RH refining furnace processes in the ferrous metallurgy. The reducing gas injecting pipe comprises a reducing front thick pipe, a reducing rear thin pipe and a protecting pipe of the reducing rear thin pipe, wherein the thick pipe is shaped as three right angle corners so as to be convenient for being arranged on a metal casing of the dipping pipe, one end of the thick pipe is provided with a connecting piece and the other end is connected with the thin pipe. The reducing gas injecting pipe is characterized in that the thick pipe is connected with the thin pipe through argon arc welding; the protecting pipe is sleeved outside the thin pipe and is connected with the thick pipe by adopting argon arc welding at a reducing joint, thereby protecting the reducing joint and the reduced thin pipe. The invention solves the problem of gas leakage at the reducing joint of the gas injecting pipe and can lead the service life of the RH refining furnace dipping pipe to be prolonged by more than 120 times from 80 times under same process conditions.
Description
Technical field
The present invention relates to a kind of reducing gas injection tube and manufacturing approach of the RH of being used for refining furnace dip pipe, belong to RH refining furnace technology field in the Ferrous Metallurgy.
Background technology
RH refining furnace dip pipe is that molten steel is carried out vacuum treated visual plant; Its internal layer is the lining body; Generally build by laying bricks or stones with accurate in size magnesite-chrome brick, the outside of lining body is a metal shell, between magnesite-chrome brick lining body and the metal shell with pours or be pressed into material and fill; Metal shell is welded with anchoring piece outward, and outer the cast by steel fiber castable forms.In dip pipe lining body, 12～16 gas injection tubes (tunger tube) are installed, are blown into argon gas.Gas injection tube need serve as a contrast at magnesite-chrome brick and carry out reducing between body and the metal shell, makes the caliber of gas injection tube be blown into the pressure of argon gas from large to small with increase.Traditional gas injection tube reducing method is that extra heavy pipe adopts with the joint of tubule and is threaded or directly welding, under high temperature, high pressure conditions; Reducer union place is prone to leak gas, and forms air vent channel, and expansion rapidly; The one, cause the brickwork joint of the magnesite-chrome brick of dip pipe lining body internal layer to increase; Infiltrate molten steel, quicken erosion the internal layer magnesite-chrome brick, the 2nd, cause outer pours to produce crack, delamination.Gas injection tube reducer union place gas leakage; Must could continue to use after the spray repair maintenance; Not only influenced RH refining furnace continuity and produced, and the service life of having reduced dip pipe, it is significant that the technological improvement of this materialization is carried out in gas injection tube reducer union place.As: the Chen Zhaoyou professor of Luoyang Refractory Institute Co., Ltd., SINO Steel Corporation promptly belongs to this type of gas injection tube at the Ar tracheae described in 2009 the 2nd phases of " refractory material " periodical " the RH refining furnace is with refractory material and improve the approach in its life-span " article of the 81st page.
Summary of the invention
To the defective of prior art, for solving the gas injection tube reducer union place gas leakage problem of RH refining furnace dip pipe, the present invention provides a kind of reducing gas injection tube and manufacturing approach of the RH of being used for refining furnace dip pipe.
A kind of reducing gas injection tube that is used for RH refining furnace dip pipe; Protection tube by tubule behind tubule and the reducing behind extra heavy pipe, the reducing before the reducing is formed; Extra heavy pipe is three right angle corner shapes, is convenient to it and is installed on the dip pipe metal shell, and the one of which end has connector; The other end is connected with tubule, it is characterized in that extra heavy pipe adopts argon arc welding to be connected with the connected mode of tubule; Protection tube is sleeved on the outside of tubule, adopts argon arc welding to be connected with extra heavy pipe in reducer union place, and the tubule behind reducer union and the reducing is shielded.
The manufacturing approach of reducing gas injection tube in a kind of RH refining furnace dip pipe, step is following:
1) confirms the reducer union position of gas injection tube, pass 10～20mm place, i.e. pours place between magnesite-chrome brick lining body and metal shell behind the metal shell of dip pipe at gas injection tube;
2) length of tubule behind the length of the preceding extra heavy pipe of every reducing of mensuration and the reducing; The length of extra heavy pipe is 1000～3000mm before the reducing; The length of tubule is 150～250mm behind the reducing, and the length that requires tubule to be socketed in the extra heavy pipe is 10～15mm, and the tubule external diameter is than the little 2～4mm of extra heavy pipe internal diameter;
3) tubule is socketed in the extra heavy pipe, and the argon arc welding is adopted in reducer union;
4) reducer union welding is suppressed test after good, and whether check leaks gas, and promptly carries out next step after air tight;
5) extra heavy pipe before the suit protection tube again of the tubule exposed parts behind the gas injection tube reducing, protection tube specification and reducing is identical, adopts argon arc welding to be connected with extra heavy pipe in reducer union place protection tube, gas injection tube manufacturing completion.
Gas injection tube of the present invention is suppressed test before installation, whether check leaks gas.Check and to be installed on the dip pipe after air tight.
Gas injection tube of the present invention is applicable to the gas injection tube of making RH refining furnace dip pipe; Owing to adopt protection tube to be socketed in the outside of tubule; Adopt argon arc welding to be connected with extra heavy pipe in reducer union place; Tubule to behind reducer union and the reducing plays a protective role, and has alleviated the residing high temperature of gas injection tube, hyperbaric environment to a certain extent, has fundamentally solved gas leakage problem in gas injection tube reducing section header place in the RH refining furnace dip pipe.
Gas injection tube of the present invention is reasonable in design; Not only prolonged the service life of self; Also prolong the service life of refining furnace dip pipe, to serialization production, reduce production costs and increase output and bring useful effect, and can reduce the number of times that spray repair inside and outside the dip pipe is safeguarded.With the prior art is example, and using traditional gas injection tube that the dip pipe life-span is added up the highest service life is 80 heats, and uses gas injection tube of the present invention that the dip pipe life-span is brought up to more than 120 heats.
Description of drawings
Fig. 1 is a reducing gas injection tube structural representation of the present invention.
Fig. 2 is installed in the user mode sketch map on the dip pipe for the reducing gas injection tube.
Wherein, 1, extra heavy pipe, 2, tubule, 3, protection tube, 4, reducer union, 5, connector, 6, gas injection tube, 7, pours, 8, metal shell, 9, pours, 10, magnesite-chrome brick lining body, 11, anchoring piece.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified, but be not limited thereto.
Embodiment 1:
The embodiment of the invention 1 is as shown in Figure 1; A kind of reducing gas injection tube that is used for RH refining furnace dip pipe is made up of the protection tube 3 of tubule 2 behind tubule 2 and the reducing behind extra heavy pipe before the reducing 1, the reducing, and extra heavy pipe 1 is three right angle corner shapes; Being convenient to it is installed on the dip pipe metal shell 8; The one of which end has connector 5, and the other end is connected with tubule 2, it is characterized in that extra heavy pipe 1 adopts argon arc welding to be connected with the connected mode of tubule 2; Protection tube 3 is sleeved on the outside of tubule 2, adopts argon arc welding to be connected at reducer union 4 places with extra heavy pipe 1, and the tubule 2 behind reducer union 4 and the reducing is shielded.
Embodiment 2:
The manufacturing approach of reducing gas injection tube in a kind of RH refining furnace dip pipe, shown in Fig. 1-2, step is following:
1) confirms reducer union 4 positions of gas injection tube 6, pass the 15mm places, metal shell 8 back of dip pipe, promptly serve as a contrast pours 9 places between body 10 and the metal shell 8 at magnesite-chrome brick at gas injection tube 6;
2) length of tubule 2 behind the length of the preceding extra heavy pipe 1 of every reducing of mensuration and the reducing, wherein 12 preceding extra heavy pipes of reducing are installed in the dip pipe lining body, are divided into two rows, evenly distribute along the dip pipe circumference, and two rows are interspersed.Wherein the length of 6 extra heavy pipes 1 of the row of going up is 1000mm, and the length of 6 extra heavy pipes 1 of following row is 1460mm; The length of tubule 2 all is 175mm behind the reducing, and the length that tubule 2 is socketed in the extra heavy pipe 1 is 12mm, and tubule 2 external diameters are than the little 3mm of extra heavy pipe 1 internal diameter;
3) tubule 2 is socketed in the extra heavy pipe 1, and the argon arc welding is adopted in reducer union 4, and tubule 2 and extra heavy pipe 1 are welded together;
4) reducer union 4 welding is suppressed test after good, and whether check leaks gas, and promptly carries out next step after air tight;
5) extra heavy pipe 1 before the suit protection tube 3 again of tubule 2 exposed parts behind gas injection tube 6 reducings, protection tube 3 specifications and reducing is identical, adopts argon arc welding to be connected at reducer union 4 places protection tube 3 and extra heavy pipe 1, and gas injection tube 6 is made completion.
Suppress the air-tightness of test before gas injection tube of the present invention is installed, check to be installed on the Laiwu iron and steel group silver-colored mountain steel mill 130tRH of the shaped steel Co., Ltd refining furnace dip pipe after air tight with check reducer union 4 places.Under equal process conditions, the reducer union of former dip pipe gas injection tube is adopted and is threaded, and be 80 heats the highest service life, adopts gas injection tube of the present invention, and the dip pipe life-span is brought up to more than 120 heats.Solved the gas leakage problem of gas injection tube reducer union place.
Claims (1)
1. manufacturing approach that is used for the reducing gas injection tube of RH refining furnace dip pipe, step is following:
1) confirms the reducer union position of gas injection tube, pass 10～20mm place, i.e. pours place between magnesite-chrome brick lining body and metal shell behind the metal shell of dip pipe at gas injection tube;
2) length of tubule behind the length of the preceding extra heavy pipe of every reducing of mensuration and the reducing; The length of extra heavy pipe is 1000～3000mm before the reducing; The length of tubule is 150～250mm behind the reducing, and the length that requires tubule to be socketed in the extra heavy pipe is 10～15mm, and the tubule external diameter is than the little 2～4mm of extra heavy pipe internal diameter;
3) tubule is socketed in the extra heavy pipe, and the argon arc welding is adopted in reducer union;
4) reducer union welding is suppressed test after good, and whether check leaks gas, and promptly carries out next step after air tight;
5) extra heavy pipe before the suit protection tube again of the tubule exposed parts behind the gas injection tube reducing, protection tube specification and reducing is identical, adopts argon arc welding to be connected with extra heavy pipe in reducer union place protection tube, gas injection tube manufacturing completion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100174040A CN101614482B (en) | 2009-07-24 | 2009-07-24 | Reducing gas injecting pipe for RH refining furnace dipping pipe and fabricating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100174040A CN101614482B (en) | 2009-07-24 | 2009-07-24 | Reducing gas injecting pipe for RH refining furnace dipping pipe and fabricating method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101614482A CN101614482A (en) | 2009-12-30 |
| CN101614482B true CN101614482B (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100174040A Expired - Fee Related CN101614482B (en) | 2009-07-24 | 2009-07-24 | Reducing gas injecting pipe for RH refining furnace dipping pipe and fabricating method thereof |
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| Country | Link |
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| CN (1) | CN101614482B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2712216A1 (en) * | 1993-11-12 | 1995-05-19 | Lorraine Laminage | Plunger for a vacuum steel decarburising vessel |
| JP3061310B2 (en) * | 1991-12-18 | 2000-07-10 | 能美防災株式会社 | Fire alarm |
| JP2001192726A (en) * | 2000-01-11 | 2001-07-17 | Nkk Corp | Method for smelting extra-low nitrogen steel and degassing treatment device |
-
2009
- 2009-07-24 CN CN2009100174040A patent/CN101614482B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3061310B2 (en) * | 1991-12-18 | 2000-07-10 | 能美防災株式会社 | Fire alarm |
| FR2712216A1 (en) * | 1993-11-12 | 1995-05-19 | Lorraine Laminage | Plunger for a vacuum steel decarburising vessel |
| JP2001192726A (en) * | 2000-01-11 | 2001-07-17 | Nkk Corp | Method for smelting extra-low nitrogen steel and degassing treatment device |
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| Publication number | Publication date |
|---|---|
| CN101614482A (en) | 2009-12-30 |
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| CB03 | Change of inventor or designer information |
Inventor after: Li Hongjian Inventor after: Wu Guangjun Inventor after: Zhang Jijun Inventor after: Zheng Chunyu Inventor after: Yang Jigang Inventor after: Chen Xiuli Inventor before: Li Hongjian Inventor before: Wu Guangjun |
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Free format text: CORRECT: INVENTOR; FROM: LI HONGJIAN WU GUANGJUN TO: LI HONGJIAN WU GUANGJUN ZHANG JIJUN ZHENG CHUNYU YANG JIGANG CHEN XIULI |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20120704 Termination date: 20160724 |