CN116377164B - Steel ladle steel pipe outlet maintenance sleeve and maintenance method - Google Patents
Steel ladle steel pipe outlet maintenance sleeve and maintenance method Download PDFInfo
- Publication number
- CN116377164B CN116377164B CN202310337377.5A CN202310337377A CN116377164B CN 116377164 B CN116377164 B CN 116377164B CN 202310337377 A CN202310337377 A CN 202310337377A CN 116377164 B CN116377164 B CN 116377164B
- Authority
- CN
- China
- Prior art keywords
- pipe
- steel
- pipe section
- maintenance
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 238000012423 maintenance Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010079 rubber tapping Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000005245 sintering Methods 0.000 claims abstract description 3
- 239000011819 refractory material Substances 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4653—Tapholes; Opening or plugging thereof
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The application discloses a steel ladle steel pipe outlet maintenance sleeve, which comprises a first pipe section, a second pipe section, a third pipe section and a fourth pipe section which are coaxially fixed from top to bottom and are sequentially connected with the pipe wall; in the maintenance sleeve fixing state, the first pipe section is positioned above the steel tapping pipe, and the second pipe section is partially accommodated in the steel tapping pipe; and the third pipe section and the fourth pipe section are all accommodated in the steel outlet pipe. The ladle tapping pipe maintenance method comprises the following steps: sleeve nesting: clamping and putting a maintenance sleeve after molten steel in the converter is removed; nesting a maintenance sleeve into a steel outlet pipe from a converter mouth in an inclined state, and clamping the maintenance sleeve on a converter refractory connected with the upper end of the steel outlet pipe; and (3) sleeve fixation: after the maintenance sleeve is placed, filling a repair material between the converter refractory and the maintenance sleeve, and sintering by using the residual temperature of the converter to complete the fixation of the maintenance sleeve. And the service life and maintenance efficiency of the steel pipe are effectively prolonged by improving the shape of the sleeve and the mounting and fixing method.
Description
Technical Field
The application relates to the field of ferrous metallurgy, in particular to a steel ladle steel pipe maintenance sleeve and a maintenance method.
Background
The appearance of the top-bottom combined blown converter greatly improves the quality of molten steel, but the final molten steel is still influenced by C-O balance. Particularly for low-carbon steel types, the high oxidizing property of molten steel is almost inevitable at the end point of converter smelting, after the end point of converter smelting is reached, molten steel entering a ladle flows out of a steel pipe, and oxygen-enriched molten steel and steel slag are extremely easy to erode refractory materials. The corrosion not only causes the inner diameter of the steel tapping pipe to be enlarged, the length of the steel tapping pipe and the steel tapping time to be shortened, the service life to be reduced, but also causes the inner end shape to be poor due to corrosion, so that the steel tapping flow and slag discharging are caused, and the steel tapping quality and the use safety are affected.
The existing common tapping pipe maintenance mode is to fill a section of constant-diameter steel pipe from the port of the tapping pipe far away from the converter to repair instead, so that the method is time-consuming and labor-consuming on one hand, and the effect of prolonging the service life of the tapping pipe is not obvious on the other hand.
Disclosure of Invention
The technical problems to be solved are as follows:
the maintenance mode of the steel pipe for replacing and repairing a section of steel pipe with equal diameter in the prior art is time-consuming and labor-consuming, and the effect of prolonging the service life of the steel pipe is not obvious. Therefore, the purpose of the application is to provide a maintenance method and a maintenance sleeve used for the method, wherein the service life of the steel pipe is effectively prolonged, and the maintenance efficiency is high.
The technical scheme is as follows: the application discloses a steel ladle steel pipe outlet maintenance sleeve, which comprises a steel pipe outlet with gradually reduced inner diameter from top to bottom, and is characterized by comprising a first pipe section, a second pipe section, a third pipe section and a fourth pipe section which are coaxially fixed from top to bottom and are sequentially connected with the pipe wall; in the fixed state of the maintenance sleeve, the minimum outer diameter of the first pipe section is larger than the maximum inner diameter of the steel outlet pipe; the outer diameter of the second pipe section gradually decreases from top to bottom, and the ratio of the outer diameter of the second pipe section changing along with the length of the second pipe section is larger than the ratio of the inner diameter of the tapping pipe changing along with the length of the tapping pipe; the outer diameters of the third pipe section and the fourth pipe section are smaller than or equal to the inner diameter of the steel tapping pipe at the deep position.
Preferably, the ratio of the inner diameter of the third tube section as a function of length is greater than the ratio of the inner diameter of the tapping tube as a function of length; the outer diameter of the lowest end of the third pipe section is matched with the inner diameter of the tapping pipe at the corresponding position.
Preferably, the fourth tube segment has an inner diameter which gradually decreases from top to bottom, with a ratio of the inner diameter to the length being greater than a ratio of the inner diameter of the tapping tube to the length.
Preferably, the sum of the lengths of the first pipe section and the second pipe section is more than or equal to one third of the length of the steel outlet pipe and less than one half of the length of the steel outlet pipe; the sum of the lengths of the third pipe section and the fourth pipe section is more than or equal to one third of the length of the steel outlet pipe and less than one half of the length of the steel outlet pipe.
Preferably, the upper end of the steel outlet pipe is fixedly connected with a refractory material, the refractory material is a metal oxide material arranged around the upper end of the steel outlet pipe, one end of the refractory material is fixed on the steel outlet pipe, and the other end of the refractory material is fixed on the inner wall of the converter.
The application discloses a maintenance method of steel ladle tapping steel pipes, which comprises the following steps:
step one, sleeve nesting: after molten steel in the converter is removed, clamping and putting in a maintenance sleeve by using a clamping device; nesting a maintenance sleeve into a steel outlet pipe from a converter mouth in an inclined state, and clamping the maintenance sleeve on a converter refractory connected with the upper end of the steel outlet pipe;
step two, sleeve fixing: after the maintenance sleeve is placed, filling a repair material between the converter refractory and the maintenance sleeve, and sintering by using the residual temperature of the converter to complete the fixation of the maintenance sleeve.
Preferably, the clamping device comprises a slag blocking vehicle with clamping and throwing functions.
The beneficial effects are that: the maintenance action of the maintenance sleeve on the tapping pipe is enhanced by improving the form of the maintenance sleeve; on the other hand, the method for installing and fixing the maintenance sleeve on the connecting converter side of the steel pipe improves the original method for installing the maintenance sleeve on the bottom of the steel pipe, so that the fixing effect is better, and the maintenance effect is better.
Drawings
FIG. 1 is a flow chart of a tapping pipe maintenance method in the present application;
FIG. 2 is a schematic structural view of a tapping pipe maintenance sleeve in the present application;
FIG. 3 is a statistical chart of the length of the steel tube and remaining service life of the steel tube after maintenance using a maintenance sleeve in an embodiment of the present application;
1 steel pipe, 2 first pipe section, 3 second pipe section, 4 third pipe section, 5 fourth pipe section, 6 refractory.
Detailed Description
The technical scheme of the application is further described below with reference to the accompanying drawings.
As shown in fig. 2, the steel tapping pipe 1 is positioned at the bottom of the converter, and extends from the inner wall of the converter to the lower region of the converter, so as to guide and discharge the molten steel produced in the converter; the steel outlet pipe 1 is provided with a refractory 6 at a portion connected to the converter, and the refractory 6 is slightly higher than the inner wall of the converter in the vertical direction.
In the continuous working engineering of the steel outlet pipe 1, the steel outlet pipe 1 is easy to be corroded and damaged, and the damage starts from the bottom of the steel outlet pipe 1, so that the length of the steel outlet pipe 1 is continuously shortened, the inner diameter of the bottom end is gradually increased, and the length and the inner diameter of the steel outlet pipe 1 are compared, namely the length and the inner diameter of the steel outlet pipe 1 which are not corroded and damaged completely are used as comparison objects, and the inner diameter of the uppermost end of the steel outlet pipe 1 is 198mm, and the total length is 1630mm.
The total length of the maintenance sleeve is 1100mm, and the maintenance sleeve is formed by welding four sections of pipe bodies, namely a first pipe section 2, a second pipe section 3, a third pipe section 4 and a fourth pipe section 5: the first pipe section 2 is a straight pipe with an outer diameter of 210mm and a length of 325mm, and the outer diameter is larger than the inner diameter of the uppermost end of the steel tapping pipe 1, but is not in contact with the steel tapping pipe 1, and the position is completely above the steel tapping pipe 1.
The length of the second pipe section 3 is 220mm, the inner diameter of the second pipe section 3 gradually decreases from top to bottom, the pipe diameter of the uppermost end of the second pipe section is matched with the pipe diameter of the first pipe section 2, the second pipe section is welded and fixed with the first pipe section 2, and the ratio of the inner diameter of the second pipe section along with the length is larger than that of the steel tapping pipe 1, so that a first part accommodated in the steel tapping pipe 1 and a second part with the outer diameter larger than the inner diameter of the uppermost end of the steel tapping pipe 1 exist on the second pipe section 3, and the second part can be clamped on a refractory 6 connected with the steel tapping pipe 1.
The length of the third pipe section 4 is 500mm, the outer diameter is 180mm, and the third pipe section is equal to the outer diameter of the lowest end of the second pipe section 3 and is welded with the second pipe section; the third pipe section 4 is a straight pipe and is completely contained in the steel tapping pipe 1, and the outer diameter of the lowest end of the third pipe section 4 is matched with the inner diameter of the steel tapping pipe 1 at the corresponding position, so that mutual clamping is realized.
The length of the fourth pipe section 5 is 55mm, the outer diameter of the uppermost end of the fourth pipe section is equal to that of the third pipe section 4, and the fourth pipe section and the third pipe section are welded with each other; the fourth tube section 5 is completely housed inside the tapping tube 1, the internal diameter of which gradually decreases from top to bottom, and the ratio of the internal diameter of which varies with height is greater than the ratio of the internal diameter of the tapping tube 1 varying with height, so as not to interfere with the tapping tube 1.
After the maintenance sleeve meeting the above conditions is prepared, an actual sleeve maintenance effect test is performed by a maintenance method shown in fig. 1, and the test result is shown in fig. 3, so that the average length of the tapping pipe maintained by the maintenance sleeve is 678mm, and the average remaining life is 362 times. Compared with the prior art, the average residual life of the straight steel pipe repair is about 252 times, and the maintenance effect is improved by 43.7%.
Claims (4)
1. The steel ladle steel pipe outlet maintenance sleeve comprises a steel pipe (1) with the inner diameter gradually reduced from top to bottom, and is characterized by comprising a first pipe section (2), a second pipe section (3), a third pipe section (4) and a fourth pipe section (5) which are coaxially fixed from top to bottom and are sequentially connected with the pipe wall; in the maintenance sleeve fixed state, the minimum outer diameter of the first pipe section (2) is larger than the maximum inner diameter of the tapping pipe (1); the outer diameter of the second pipe section (3) gradually decreases from top to bottom, and the ratio of the outer diameter of the second pipe section (3) to the length change of the second pipe section (3) is larger than the ratio of the inner diameter of the tapping pipe (1) to the length change of the tapping pipe (1); the outer diameters of the third pipe section (4) and the fourth pipe section (5) are smaller than or equal to the inner diameter of the steel tapping pipe (1) at the deep position; the ratio of the inner diameter of the third pipe section (4) which changes with the length is larger than the ratio of the inner diameter of the tapping pipe (1) which changes with the length; the outer diameter of the lowest end of the third pipe section (4) is matched with the inner diameter of the tapping pipe (1) at the corresponding position; the inner diameter of the fourth pipe section (5) gradually decreases from top to bottom, and the ratio of the inner diameter to the length change is larger than that of the inner diameter of the steel tapping pipe (1);
wherein the sum of the lengths of the first pipe section (2) and the second pipe section (3) is more than or equal to one third of the length of the tapping pipe (1) and less than one half of the length of the tapping pipe (1); the sum of the lengths of the third pipe section (4) and the fourth pipe section (5) is more than or equal to one third of the length of the steel tapping pipe (1), and is less than one half of the length of the steel tapping pipe (1).
2. The maintenance sleeve according to claim 1, wherein the upper end of the tapping pipe (1) is fixedly connected with a refractory material (6), the refractory material (6) is a metal oxide material arranged around the upper end of the tapping pipe (1), one end of the refractory material is fixed on the tapping pipe, and the other end of the refractory material is fixed on the inner wall of the converter.
3. A ladle tapping pipe maintenance method, characterized in that the ladle tapping pipe maintenance sleeve according to any one of claims 1-2 is adopted, comprising the following steps:
step one, sleeve nesting: after molten steel in the converter is removed, clamping and putting in a maintenance sleeve by using a clamping device; nesting a maintenance sleeve into a steel outlet pipe from a converter mouth in an inclined state, and clamping the maintenance sleeve on a converter refractory connected with the upper end of the steel outlet pipe;
step two, sleeve fixing: after the maintenance sleeve is placed, filling a repair material between the converter refractory and the maintenance sleeve, and sintering by using the residual temperature of the converter to complete the fixation of the maintenance sleeve.
4. A maintenance method according to claim 3, wherein the gripping means comprises a slag car with gripping and throwing functions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310337377.5A CN116377164B (en) | 2023-03-31 | 2023-03-31 | Steel ladle steel pipe outlet maintenance sleeve and maintenance method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310337377.5A CN116377164B (en) | 2023-03-31 | 2023-03-31 | Steel ladle steel pipe outlet maintenance sleeve and maintenance method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116377164A CN116377164A (en) | 2023-07-04 |
| CN116377164B true CN116377164B (en) | 2024-02-13 |
Family
ID=86972632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310337377.5A Active CN116377164B (en) | 2023-03-31 | 2023-03-31 | Steel ladle steel pipe outlet maintenance sleeve and maintenance method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116377164B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000012230U (en) * | 1998-12-16 | 2000-07-05 | 이구택 | Converter's outlet sleeve |
| JP2010047795A (en) * | 2008-08-20 | 2010-03-04 | Sumitomo Metal Ind Ltd | Sleeve for tapping hole of converter and method for producing hot metal |
| CN216473308U (en) * | 2021-10-13 | 2022-05-10 | 阳春新钢铁有限责任公司 | Novel converter steel tapping hole |
-
2023
- 2023-03-31 CN CN202310337377.5A patent/CN116377164B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000012230U (en) * | 1998-12-16 | 2000-07-05 | 이구택 | Converter's outlet sleeve |
| JP2010047795A (en) * | 2008-08-20 | 2010-03-04 | Sumitomo Metal Ind Ltd | Sleeve for tapping hole of converter and method for producing hot metal |
| CN216473308U (en) * | 2021-10-13 | 2022-05-10 | 阳春新钢铁有限责任公司 | Novel converter steel tapping hole |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116377164A (en) | 2023-07-04 |
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