CN107012289A - Converter bottom repairing method - Google Patents
Converter bottom repairing method Download PDFInfo
- Publication number
- CN107012289A CN107012289A CN201610059469.1A CN201610059469A CN107012289A CN 107012289 A CN107012289 A CN 107012289A CN 201610059469 A CN201610059469 A CN 201610059469A CN 107012289 A CN107012289 A CN 107012289A
- Authority
- CN
- China
- Prior art keywords
- converter
- slag
- steel
- splash
- mending
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010079 rubber tapping Methods 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000003628 erosive effect Effects 0.000 abstract description 11
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000005406 washing 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
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
-
- 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
- C21C5/48—Bottoms or tuyéres of converters
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 invention provides a converter bottom repairing method, wherein oxygen in molten steel at the blowing end point of a converter before tapping is controlled to be 700-1000 ppm, and the temperature of the molten steel is controlled to be 1680-1710 ℃; after the molten steel of the converter is completely discharged, tilting the converter to 50-70 degrees, and keeping the molten slag in the converter, wherein the amount of the molten slag is more than 45kg/t steel; turning the repairing mass into a converter, wherein the quantity of the repairing mass is 4.8-5.2 kg/t steel; tilting the converter to zero position to splash slag, wherein the nitrogen flow of slag splashing is 3.0-3.6 Nm3At/min.t, the pressure is 0.9-1.05 MPa; the slag splashing gun position is gradually reduced from 2100mm to 500mm, and the slag splashing time is more than 3 min; and (5) after the slag splashing is finished, the converter is static at the zero position for more than 30 min. The invention can improve the erosion resistance of the furnace bottom and the spherical segment part, and basically synchronizes the erosion of all parts of the converter, thereby avoiding the occurrence of steel leakage accidents, and realizing the uniformity of the erosion speed of the converter lining and the long service life of the converter lining.
Description
Technical field
The invention belongs to process for making technical field, more particularly to a kind of fettling method of big-and-middle-sized combined blown converter.
Background technology
Converter is in smelting process, because high-temperature molten steel and high temperature furnace slag are constantly corroded and bottom rifle gas pair converter bottom position
Constantly washing away for furnace bottom, causes the erosive velocity positions more other than furnace lining at furnace bottom position fast, causes furnace bottom can not be with converter lining
The erosive velocity at each position is synchronous；And because furnace bottom corrodes too fast, cause converter segment position to corrode quickening, add converter
The risk of bleed-out, therefore the maintenance of big-and-middle-sized combined blown converter ball furnace bottom is extremely important.
The content of the invention
The present invention provides a kind of converter bottom method for repairing and mending, and its purpose is intended to slow down converter segment position erosive velocity, is allowed to and stove
Serve as a contrast other position erosive velocitys quite, so as to avoid bleed-out accident, realize furnace lining long service life.
Therefore, the technical solution that the present invention is taken is：
A kind of converter bottom method for repairing and mending, its specific method and step are：
(1) control of converter blowing end point steel water oxygen is in 700~1000ppm before tapping, and liquid steel temperature is controlled 1680~1710
℃；
(2) molten steel goes out only during converter tapping, and then slag is stayed in converter inclining in converter to, slag to 50 °~70 °
Amount is more than 45kg/t steel；
(3) mending material is ploughed under in converter using scrap box, mending material quantity 4.8~5.2kg/t steel；
(4) converter inclining to zero-bit is splashed into slag, splashes 3.0~3.6Nm of slag nitrogen flow3/ min.t, 0.9~1.05MPa of pressure；
(5) splash slag rifle position and be gradually decreased to 500mm from 2100mm, splash the slag time more than 3min；
(6) splash after slag terminates, converter is in static more than the 30min of zero-bit.
The mending material technical parameter is：
MgO >=65wt%, C >=2wt%；
Apparent porosity≤25%；Compressive resistance >=15MPa；Rupture strength >=3MPa；Bulk density >=2.2g/cm3；
Linear change rate -2.0~+2.0.
Beneficial effects of the present invention are：
The present invention can make the mending material of good fluidity mix and be attached to after furnace bottom and segment position, sintering with converter high alkalinity slag
Stick on furnace lining, improve the erosion resisting at furnace bottom and segment position so that the erosion at converter bottom and segment position with it is other
The erosion basic synchronization at position, so as to avoid the occurrence of bleed-out accident, realizes the unification of converter lining erosive velocity and the length of furnace lining
Shou Hua.
Embodiment
Embodiment is 200 tons of converters, and the important technological parameters of mending material used are：
2~6wt% of MgO 65~78wt%, C.
Apparent porosity 20~25%；15~22MPa of compressive resistance；3~6MPa of rupture strength；2.2~2.4g/cm of bulk density3；
Linear change rate -2.0~+2.0.
Embodiment 1：
1st, the control of converter blowing end point steel water oxygen is in 830ppm before tapping, and liquid steel temperature is controlled at 1695 DEG C.
2nd, molten steel goes out only during converter tapping, and then slag is stayed in converter inclining in converter to 65 °, slag amount 12.3t.
3rd, mending material is ploughed under in converter using scrap box, mending material quantity 1000kg.
4th, converter inclining to zero-bit is splashed into slag, splashes slag nitrogen flow 3.3Nm3/ min.t, pressure 0.95MPa.
5th, splash slag rifle position and be gradually decreased to 500mm from 2100mm, splash slag time 5min.
6th, splash after slag terminates, converter is in the static 35min of zero-bit.
Embodiment 2：
1st, the control of converter blowing end point steel water oxygen is in 900ppm before tapping, and liquid steel temperature is controlled at 1700 DEG C.
2nd, molten steel goes out only during converter tapping, and then slag is stayed in converter inclining in converter to 58 °, slag amount 11.5t.
3rd, mending material is ploughed under in converter using scrap box, mending material quantity 1000kg.
4th, converter inclining to zero-bit is splashed into slag, splashes slag nitrogen flow 3.5Nm3/ min.t, pressure 1.0MPa.
5th, splash slag rifle position and be gradually decreased to 500mm from 2100mm, splash slag time 3.5min.
6th, splash after slag terminates, converter is in the static 32min of zero-bit.
Furnace bottom during to 1476 stove of furnace life carries out thickness measuring, and now thinnest point thickness in furnace bottom position is 721mm.Pass through the inventive method
After repairing, when 1478 stove of furnace life, furnace bottom same area thinnest point thickness is 785mm, i.e. the thickness of most thin section position is still thicker than not
Before repairing.
Claims (2)
1. a kind of converter bottom method for repairing and mending, it is characterised in that：
(1) control of converter blowing end point steel water oxygen is in 700~1000ppm before tapping, and liquid steel temperature control exists
1680~1710 DEG C；
(2) molten steel goes out only during converter tapping, then by converter inclining to 50 °~70 °, and slag is stayed in and turned
In stove, slag amount is more than 45kg/t steel；
(3) mending material is ploughed under in converter using scrap box, mending material quantity 4.8~5.2kg/t steel；
(4) converter inclining to zero-bit is splashed into slag, splashes 3.0~3.6Nm of slag nitrogen flow3/ min.t, pressure 0.9~
1.05MPa；
(5) splash slag rifle position and be gradually decreased to 500mm from 2100mm, splash the slag time more than 3min；
(6) splash after slag terminates, converter is in static more than the 30min of zero-bit.
2. converter bottom method for repairing and mending according to claim 1, it is characterised in that the mending material skill
Art parameter is：
MgO >=65wt%, C >=2wt%；
Apparent porosity≤25%；
Compressive resistance >=15MPa；
Rupture strength >=3MPa；
Bulk density >=2.2g/cm3；
Linear change rate -2.0~+2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610059469.1A CN107012289A (en) | 2016-01-27 | 2016-01-27 | Converter bottom repairing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610059469.1A CN107012289A (en) | 2016-01-27 | 2016-01-27 | Converter bottom repairing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107012289A true CN107012289A (en) | 2017-08-04 |
Family
ID=59438682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610059469.1A Pending CN107012289A (en) | 2016-01-27 | 2016-01-27 | Converter bottom repairing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107012289A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09316522A (en) * | 1996-05-31 | 1997-12-09 | Nippon Steel Corp | Method for repairing furnace bottom of converter |
| CN1434133A (en) * | 2003-02-09 | 2003-08-06 | 武汉钢铁(集团)公司 | Method for controlling rising splash slag in battom of converter |
| RU2004127503A (en) * | 2004-09-13 | 2006-03-10 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") (RU) | CONVERTER LAYER REPAIR METHOD |
| CN1796576A (en) * | 2004-12-27 | 2006-07-05 | 宝钢集团上海第一钢铁有限公司 | Method for maintaining converter |
| CN101177720A (en) * | 2007-12-17 | 2008-05-14 | 南京钢铁股份有限公司 | Slag splashing method for converter high-oxidisability furnace residue |
| CN102603310A (en) * | 2011-09-06 | 2012-07-25 | 孙宇飞 | Quick sintering repairing mass used for steel mill converter |
| CN104498665A (en) * | 2014-12-11 | 2015-04-08 | 南京梅山冶金发展有限公司 | Slag-splashing lining protection material regenerated by used magnesia carbon brick for converter |
-
2016
- 2016-01-27 CN CN201610059469.1A patent/CN107012289A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09316522A (en) * | 1996-05-31 | 1997-12-09 | Nippon Steel Corp | Method for repairing furnace bottom of converter |
| CN1434133A (en) * | 2003-02-09 | 2003-08-06 | 武汉钢铁(集团)公司 | Method for controlling rising splash slag in battom of converter |
| RU2004127503A (en) * | 2004-09-13 | 2006-03-10 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") (RU) | CONVERTER LAYER REPAIR METHOD |
| CN1796576A (en) * | 2004-12-27 | 2006-07-05 | 宝钢集团上海第一钢铁有限公司 | Method for maintaining converter |
| CN101177720A (en) * | 2007-12-17 | 2008-05-14 | 南京钢铁股份有限公司 | Slag splashing method for converter high-oxidisability furnace residue |
| CN102603310A (en) * | 2011-09-06 | 2012-07-25 | 孙宇飞 | Quick sintering repairing mass used for steel mill converter |
| CN104498665A (en) * | 2014-12-11 | 2015-04-08 | 南京梅山冶金发展有限公司 | Slag-splashing lining protection material regenerated by used magnesia carbon brick for converter |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170804 |
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| RJ01 | Rejection of invention patent application after publication |