CN102851456A - Method for online removing cold steel in RH vacuum chamber - Google Patents
Method for online removing cold steel in RH vacuum chamber Download PDFInfo
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- CN102851456A CN102851456A CN2011101805786A CN201110180578A CN102851456A CN 102851456 A CN102851456 A CN 102851456A CN 2011101805786 A CN2011101805786 A CN 2011101805786A CN 201110180578 A CN201110180578 A CN 201110180578A CN 102851456 A CN102851456 A CN 102851456A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 124
- 239000010959 steel Substances 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 53
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 76
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 76
- 239000001301 oxygen Substances 0.000 claims abstract description 76
- 238000002485 combustion reaction Methods 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000005261 decarburization Methods 0.000 claims abstract description 3
- 239000003034 coal gas Substances 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009835 boiling Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 239000011819 refractory material Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for removing cold steel in an RH vacuum chamber on line, which is characterized in that a top lance oxygen blowing method is adopted to remove cold steel on line during RH molten steel treatment, and the operation steps are as follows: 1) the temperature of the inner wall of the vacuum chamber is required to be more than or equal to 1350 ℃ before molten steel is processed in the vacuum chamber; 2) during the treatment of boiling steel, the lance position and the oxygen flow are controlled, and the vacuum inner wall is heated by utilizing the secondary combustion effect of CO generated by molten steel decarburization, so that the splashing and adhesion of the molten steel are reduced. And cold steel can be removed on line by adopting a top lance oxygen injection method immediately after RH molten steel treatment is finished. Compared with the prior art, the invention has the beneficial effects that: 1) the rapid removal of cold steel in the vacuum chamber is realized, the cold steel can be removed within 30min at the fastest speed, and the blockage of the inner cavity of the insertion pipe for melting steel slag is effectively avoided. 2) And the refractory material of the vacuum chamber is not damaged in the cold steel removing process. 3) The production cost is reduced, the labor intensity is reduced, and the labor safety guarantee is improved.
Description
Technical field
The present invention relates to ferrous metallurgy furnace outer refining technology field, relate to the method for the cold steel of a kind of online removal RH vacuum chamber.
Background technology
The metallurgical function of modern various refining units is tending towards variation and high-level efficiency, with the requirement of constantly satisfying steel products kind and quality and the high-level efficiency of production.RH vacuum refinement equipment has obtained using more and more widely since the nineteen fifty-nine invention, and its function has also obtained development and perfect.
Because the steel grade that RH processes is take the rimming steel of not deoxidation as main, RH is violent owing to the molten steel decarburizing reaction when processing this type of, the molten steel splash is large, cause steel bonding on the vacuum chamber inwall refractory brick, dry slag heavier, after the long-term accumulation, cold steel and residue constantly thicken on the vacuum chamber inwall, and maximum cold steel thickness reaches more than the 200mm often, during processing molten steel, often come off, cause the carburetting of Ultra-low Carbon Molten Steel even exceed standard to change steel or cause the consequences such as molten steel temperature drop is excessive.In addition, the cold steel of vacuum chamber inwall that does not come off is processed very difficult after vacuum chamber rolls off the production line, vacuum chamber need to be sling manually uses oxygen to burn the steel operation, labour intensity is large and have a potential safety hazard, especially the monoblock type vacuum chamber is because the middle part can not be separated with the bottom, and it is more difficult to process residual steel.
Existing RH vacuum apparatus is processed this kind problem and is normally adopted the modes such as top rifle or heated by electrodes to melt the interior cold steel of vacuum chamber, cold steel and the residue fusing of vacuum chamber inwall are discharged to outside the vacuum chamber by tubular stinger afterwards, the shortcoming of this kind method is that the activity duration is long, usually need more than 2 hours, the slag of fusing often stops up the tubular stinger inner chamber in addition, cause subsequent disposal molten steel circulation variation, the operator is reluctant to carry out this operation more for this reason, brought thus the cold steel accumulation of vacuum chamber too much, process the excessive vicious cycle of molten steel temperature drop, production direct motion and quality product and safe operation are made a big impact.For this reason, need the method for a kind of cold steel of effective processing vacuum chamber of exploitation and residue, the purpose of cold steel in the prerequisite of not stopping up tubular stinger is issued to quick removing vacuum chamber, processing power and the level of raising RH equipment.
Summary of the invention
The method that the purpose of this invention is to provide the cold steel of a kind of online removal RH vacuum chamber, overcome the deficiencies in the prior art, remove in the RH treating processes vacuum chamber inwall cold steel that bonds, solve the too much and processed offline hard problem of cold steel in the vacuum chamber, reach to reduce and process molten steel temperature drop, minimizing Ultra-low carbon molten steel carburetting and composition below proof, reduce labour intensity and improve the safety operation condition, improve the purpose that RH processes molten steel ability and level.
For achieving the above object, the present invention is achieved through the following technical solutions:
The method of the cold steel of a kind of online removal RH vacuum chamber adopts the cold steel of the online removal of top rifle oxygen blowing method during RH processes molten steel, its operation steps is as follows:
1) vacuum chamber is processed and to be required vacuum chamber inner wall temperature 〉=1350 ℃ before the molten steel;
2) during processing rimming steel, control rifle position is between 4.0m-6.5m, and oxygen flux control is at 400-1000Nm
3/ h, vacuum degree control is at 4kpa-15kpa, and oxygen blow duration 3min-5min utilizes the secondary combustion effect of the CO of molten steel decarburization generation, and the vacuum inwall is heated, and the splash that reduces molten steel adheres to.
The method of the cold steel of a kind of online removal RH vacuum chamber, RH adopts the cold steel of the top rifle winding-up online removal of oxygen method at once after processing the molten steel end, is used for the above situation of cold steel thickness 20mm, and its operation steps is as follows:
1) require vacuum chamber inner wall temperature 〉=1000 ℃, the slag case is placed the vacuum chamber below, and inside overlays the thick sand of 20-200mm and prevents bonding;
2) top rifle winding-up oxygen, the rifle position is controlled at 4.5m-7.0m, and oxygen flux control is at 700Nm
3/ h-1500Nm
3/ h, the rifle position will constantly be adjusted, and every 5min-10min adjusts once, corresponding adjustment oxygen flow, the rifle position is higher, and oxygen flow is larger, and total oxygen blow duration≤30min prevents the scaling loss of the anti-material of vacuum chamber.
The method of the cold steel of a kind of online removal RH vacuum chamber, RH processes the cold steel of the online removal of method that top rifle winding-up oxygen and coke-oven gas are adopted in the molten steel end afterwards at once, and for the following situation of cold steel thickness 20mm, its operation steps is as follows:
1) require vacuum chamber inner wall temperature 〉=1000 ℃, the rifle position is controlled at 4.5m-7.0m, and gas flow is controlled at 300Nm
3/ h-600Nm
3/ h, the flowrate proportioning of oxygen and coal gas are (1.8-3.0): 1, and over-blowing oxygen under the prerequisite that guarantees perfect combustion;
2) the rifle position will constantly be adjusted, and every 10min-30min adjusts once, corresponding adjustment gas flow, and the rifle position is higher, and oxygen flow is larger, and total oxygen blast heat-up time≤90min prevents that the local superheating of the anti-material of vacuum chamber from damaging.
Described coal gas is High pressure coal gas, and pressure 0.15Mpa-0.4Mpa, oxygen pressure are 0.9Mpa-1.2Mpa.
Described rifle position refers to the distance of rifle head nozzle distance vacuum chamber bottom, top brick face.
Compared with prior art, the invention has the beneficial effects as follows: 1) can realize the quick removal of cold steel in the vacuum chamber, can in 30min, remove cold steel the soonest, effectively avoid the obstruction of tubular stinger inner chamber fusing slag.2) improved the vacuum chamber temperature, guaranteed that the anti-material of vacuum chamber is without prejudice in the cold steel process of removal.3) reduce production costs, reduce labor intensity, improve the labor safety guarantee.
Embodiment
The invention will be further described below in conjunction with embodiment:
Remove online the cold steel of RH vacuum chamber as example take 180 tons of RH.
Embodiment 1
Adopt the cold steel of the online removal of top rifle oxygen blowing method during RH processes molten steel, its operation steps is as follows:
1) the vacuum chamber inner wall temperature is 1360 ℃;
2) steel grade is deoxidation IF steel not, top blast rifle position 4.5m, oxygen flow 450Nm
3/ h, vacuum tightness 14kpa, oxygen pressure 0.9-1.2Mpa, oxygen blast 3min, secondary combustion is respond well, and rate of combustion is CO in the exhaust-gas analyzer
2/ (CO+CO
2) peak value reaches 0.71, by combustion heating, the vacuum chamber inner wall temperature rises to 1372 ℃, makes that cold steel adheres to less in the vacuum chamber.
Embodiment 2
Adopt the cold steel of the online removal of top rifle oxygen blowing method during RH processes molten steel, its operation steps is as follows:
1) the vacuum chamber inner wall temperature is 1352 ℃;
2) steel grade is deoxidation electrical steel not, top blast rifle position 5.5m; Oxygen flow 650Nm
3/ h; Vacuum tightness 11kpa, oxygen pressure 0.9-1.2Mpa, oxygen blast 4min, secondary combustion is respond well, and rate of combustion is CO in the exhaust-gas analyzer
2/ (CO+CO
2) peak value reaches 0.78, by combustion heating, the vacuum chamber inner wall temperature rises to 1381 ℃, makes that cold steel adheres to less in the vacuum chamber.
Embodiment 3
Adopt the cold steel of the online removal of top rifle oxygen blowing method during RH processes molten steel, its operation steps is as follows:
1) the vacuum chamber inner wall temperature is 1370 ℃;
2) steel grade is deoxidation IF steel not, top blast rifle position 6.5m, oxygen flow 950Nm
3/ h, vacuum tightness 5kpa, oxygen pressure 0.9-1.2Mpa, oxygen blast 5min, secondary combustion is respond well, and rate of combustion is CO in the exhaust-gas analyzer
2/ (CO+CO
2) peak value reaches 0.82, by combustion heating, the vacuum chamber inner wall temperature rises to 1402 ℃, makes that cold steel adheres to less in the vacuum chamber.
Embodiment 4
Adopt top rifle winding-up oxygen method to remove online cold steel after RH processes the molten steel end, for the above situation of cold steel thickness 20mm, its operation steps is as follows at once:
1) the vacuum chamber inner wall temperature is 1355 ℃;
2) the oxygen blast top gun gun bit move order by 4.5m to 5.5m again to 6.5m, each rifle position stops 5min; Oxygen flow changes by 700Nm
3/ h to 900Nm
3/ h is again to 1100Nm
3/ h, oxygen pressure 0.9-1.2Mpa, oxygen blast 15min, slag fusing rapidly, the cold steel in the vacuum chamber can flow out by smooth and easy one-tenth thread, blockage phenomenon not in the tubular stinger, this removal of cold base steel in the vacuum chamber.
Embodiment 5
Adopt top rifle winding-up oxygen method to remove online cold steel after RH processes the molten steel end, for the above situation of cold steel thickness 20mm, its operation steps is as follows at once:
1) the vacuum chamber inner wall temperature is 1319 ℃;
2) the oxygen blast top gun gun bit move order by 5.0m to 6.0m again to 7.0m, each rifle position stops 7min; Oxygen flow changes by 800Nm
3/ h to 1000Nm
3/ h is again to 1200Nm
3/ h, oxygen pressure 0.9-1.2Mpa, oxygen blast 21min, slag fusing rapidly, the cold steel in the vacuum chamber can flow out by smooth and easy one-tenth thread, blockage phenomenon not in the tubular stinger, this removal of cold base steel in the vacuum chamber.
Embodiment 6
Adopt top rifle winding-up oxygen method to remove online cold steel after RH processes the molten steel end, for the above situation of cold steel thickness 20mm, its operation steps is as follows at once:
1) the vacuum chamber inner wall temperature is 1360 ℃;
2) the oxygen blast top gun gun bit move order by 4.5m to 5.5m again to 6.0m again to 7.0m, each rifle position stops 7.5min; Oxygen flow changes by 900Nm
3/ h to 1000Nm
3/ h is again to 1250Nm
3/ h is again to 1500Nm
3/ h, oxygen pressure 0.9-1.2Mpa, oxygen blast 30min, slag fusing rapidly, the cold steel in the vacuum chamber can flow out by smooth and easy one-tenth thread, blockage phenomenon not in the tubular stinger, this removal of cold base steel in the vacuum chamber.
Embodiment 7
RH processes the cold steel of the online removal of method that top rifle winding-up oxygen and coke-oven gas are adopted in the molten steel end afterwards at once, and for the following situation of cold steel thickness 20mm, its operation steps is as follows:
1) the vacuum chamber inner wall temperature is 1333 ℃;
2) the oxygen blast top gun gun bit move order by 4.5m to 5.0m again to 6.5m again to 7.0m, each rifle position stops 10min; The High pressure coal gas fluctuations in discharge is by 300Nm
3/ h to 400Nm
3/ h is again to 500Nm
3/ h is again to 600Nm
3/ h, oxygen and High pressure coal gas flowrate proportioning: 3.0, High pressure coal gas pressure 0.15Mpa-0.4Mpa, oxygen pressure 0.9-1.2Mpa, oxygen blast heating 40min, the slag fusing is rapid, and the cold steel in the vacuum chamber can flow out by smooth and easy one-tenth thread, this removal of cold base steel in the blockage phenomenon not in the tubular stinger, vacuum chamber.
Embodiment 8
RH processes the cold steel of the online removal of method that top rifle winding-up oxygen and coke-oven gas are adopted in the molten steel end afterwards at once, and for the following situation of cold steel thickness 20mm, its operation steps is as follows:
1) the vacuum chamber inner wall temperature is 1392 ℃;
2) the oxygen blast top gun gun bit move order by 4.5m to 5.0m again to 6.5m again to 7.0m, each rifle position stops 15min; The High pressure coal gas fluctuations in discharge is by 300Nm
3/ h to 400Nm
3/ h is again to 500Nm
3/ h is again to 600Nm
3/ h, oxygen and High pressure coal gas flowrate proportioning: 2.5, High pressure coal gas pressure 0.15Mpa-0.4Mpa, oxygen pressure 0.9-1.2Mpa, oxygen blast heating 60min, the slag fusing is rapid, and the cold steel in the vacuum chamber can flow out by smooth and easy one-tenth thread, this removal of cold base steel in the blockage phenomenon not in the tubular stinger, vacuum chamber.
Embodiment 9
RH processes the cold steel of the online removal of method that top rifle winding-up oxygen and coke-oven gas are adopted in the molten steel end afterwards at once, and for the following situation of cold steel thickness 20mm, its operation steps is as follows:
1) the vacuum chamber inner wall temperature is 1346 ℃;
2) the oxygen blast top gun gun bit move order by 5.0m to 6.5m again to 7.0m, each rifle position stops 30min; The High pressure coal gas fluctuations in discharge is by 300Nm
3/ h to 400Nm
3/ h is again to 500Nm
3/ h, oxygen and High pressure coal gas flowrate proportioning: 1.8, High pressure coal gas pressure 0.15Mpa-0.4Mpa, oxygen pressure 0.9Mpa-1.2Mpa, oxygen blast heating 90min, the slag fusing is rapid, and the cold steel in the vacuum chamber can flow out by smooth and easy one-tenth thread, this removal of cold base steel in the blockage phenomenon not in the tubular stinger, vacuum chamber.
Claims (5)
1. an online method of removing the cold steel of RH vacuum chamber is characterized in that, adopts top rifle oxygen blowing method to remove online cold steel during RH processes molten steel, and its operation steps is as follows:
1) vacuum chamber is processed and to be required vacuum chamber inner wall temperature 〉=1350 ℃ before the molten steel;
2) during processing rimming steel, control rifle position is between 4.0m-6.5m, and oxygen flux control is at 400-1000Nm
3/ h, vacuum degree control is at 4kpa-15kpa, and oxygen blow duration 3min-5min utilizes the secondary combustion effect of the CO of molten steel decarburization generation, and the vacuum inwall is heated, and the splash that reduces molten steel adheres to.
2. an online method of removing the cold steel of RH vacuum chamber is characterized in that, adopts the cold steel of the top rifle winding-up online removal of oxygen method after RH processing molten steel finishes at once, is used for the above situation of cold steel thickness 20mm, and its operation steps is as follows:
1) require vacuum chamber inner wall temperature 〉=1000 ℃, the slag case is placed the vacuum chamber below, and inside overlays the thick sand of 20-200mm and prevents bonding;
2) top rifle winding-up oxygen, the rifle position is controlled at 4.5m-7.0m, and oxygen flux control is at 700Nm
3/ h-1500Nm
3/ h, the rifle position will constantly be adjusted, and every 5min-10min adjusts once, corresponding adjustment oxygen flow, the rifle position is higher, and oxygen flow is larger, and total oxygen blow duration≤30min prevents the scaling loss of the anti-material of vacuum chamber.
3. an online method of removing the cold steel of RH vacuum chamber is characterized in that, RH processes the cold steel of the online removal of method that top rifle winding-up oxygen and coke-oven gas are adopted in the molten steel end afterwards at once, and for the following situation of cold steel thickness 20mm, its operation steps is as follows:
1) require vacuum chamber inner wall temperature 〉=1000 ℃, the rifle position is controlled at 4.5m-7.0m, and gas flow is controlled at 300Nm
3/ h-600Nm
3/ h, the flowrate proportioning of oxygen and coal gas are (1.8-3.0): 1, and over-blowing oxygen under the prerequisite that guarantees perfect combustion;
2) the rifle position will constantly be adjusted, and every 10min-30min adjusts once, corresponding adjustment gas flow, and the rifle position is higher, and oxygen flow is larger, and total oxygen blast heat-up time≤90min prevents that the local superheating of the anti-material of vacuum chamber from damaging.
4. the method for the cold steel of a kind of online removal RH vacuum chamber according to claim 3 is characterized in that described coal gas is High pressure coal gas, and pressure 0.15Mpa-0.4Mpa, oxygen pressure are 0.9Mpa-1.2Mpa.
5. according to claim 1 and 2 or the methods of the cold steel of 3 described a kind of online removal RH vacuum chambers, it is characterized in that described rifle position refers to the distance of rifle head nozzle distance vacuum chamber bottom, top brick face.
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|---|---|---|---|
| CN2011101805786A CN102851456A (en) | 2011-06-29 | 2011-06-29 | Method for online removing cold steel in RH vacuum chamber |
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|---|---|---|---|
| CN2011101805786A CN102851456A (en) | 2011-06-29 | 2011-06-29 | Method for online removing cold steel in RH vacuum chamber |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789514A (en) * | 2014-01-15 | 2014-05-14 | 攀钢集团西昌钢钒有限公司 | System and method for automatically controlling coal oxygen combustion of top lance of RH (Ruhrstahl-Heraeus) furnace |
| CN105714024A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Method for removing steel slag in bottom groove of RH vacuum chamber |
| CN105861785A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Method for removing cold steel in middle groove and bottom groove of RH vacuum chamber |
| CN106011386A (en) * | 2016-06-21 | 2016-10-12 | 首钢京唐钢铁联合有限责任公司 | Control method of RH top lance cold steel |
| CN107828938A (en) * | 2016-09-15 | 2018-03-23 | 上海梅山钢铁股份有限公司 | A kind of method for preventing the cold steel of RH vacuum circulation degassing process vacuum tanks from bonding |
| CN109207676A (en) * | 2018-11-01 | 2019-01-15 | 北京首钢股份有限公司 | A kind of RH hot-bending pipe anti-blocking control method |
| CN109423537A (en) * | 2017-08-25 | 2019-03-05 | 鞍钢股份有限公司 | Method for quickly removing cold steel in RH vacuum chamber |
| CN110438299A (en) * | 2019-09-02 | 2019-11-12 | 湖南华菱湘潭钢铁有限公司 | A method of the removal cold steel slag of RH vacuum tank |
| CN111549203A (en) * | 2020-05-11 | 2020-08-18 | 首钢集团有限公司 | RH refining method for reducing temperature drop of molten steel and cold steel in vacuum chamber |
| CN113337680A (en) * | 2021-05-19 | 2021-09-03 | 湖南华菱涟钢特种新材料有限公司 | Duplex steel and method for producing same |
| CN114525380A (en) * | 2022-02-21 | 2022-05-24 | 广东韶钢松山股份有限公司 | Method for treating RH furnace dip pipe blockage |
| CN114645111A (en) * | 2022-03-25 | 2022-06-21 | 广东韶钢松山股份有限公司 | Anti-blocking method for dip pipe of RH furnace |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789514B (en) * | 2014-01-15 | 2015-09-30 | 攀钢集团西昌钢钒有限公司 | A kind of system and method for RH furnace roof rifle coal oxygen burns the fuzzy control |
| CN103789514A (en) * | 2014-01-15 | 2014-05-14 | 攀钢集团西昌钢钒有限公司 | System and method for automatically controlling coal oxygen combustion of top lance of RH (Ruhrstahl-Heraeus) furnace |
| CN105714024A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Method for removing steel slag in bottom groove of RH vacuum chamber |
| CN105714024B (en) * | 2014-12-01 | 2018-12-04 | 鞍钢股份有限公司 | Method for removing steel slag in bottom groove of RH vacuum chamber |
| CN105861785A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Method for removing cold steel in middle groove and bottom groove of RH vacuum chamber |
| CN105861785B (en) * | 2015-01-23 | 2018-02-27 | 鞍钢股份有限公司 | Method for removing cold steel in middle groove and bottom groove of RH vacuum chamber |
| CN106011386A (en) * | 2016-06-21 | 2016-10-12 | 首钢京唐钢铁联合有限责任公司 | Control method of RH top lance cold steel |
| CN107828938A (en) * | 2016-09-15 | 2018-03-23 | 上海梅山钢铁股份有限公司 | A kind of method for preventing the cold steel of RH vacuum circulation degassing process vacuum tanks from bonding |
| CN109423537A (en) * | 2017-08-25 | 2019-03-05 | 鞍钢股份有限公司 | Method for quickly removing cold steel in RH vacuum chamber |
| CN109207676A (en) * | 2018-11-01 | 2019-01-15 | 北京首钢股份有限公司 | A kind of RH hot-bending pipe anti-blocking control method |
| CN110438299A (en) * | 2019-09-02 | 2019-11-12 | 湖南华菱湘潭钢铁有限公司 | A method of the removal cold steel slag of RH vacuum tank |
| CN111549203A (en) * | 2020-05-11 | 2020-08-18 | 首钢集团有限公司 | RH refining method for reducing temperature drop of molten steel and cold steel in vacuum chamber |
| CN111549203B (en) * | 2020-05-11 | 2021-10-26 | 首钢集团有限公司 | RH refining method for reducing temperature drop of molten steel and cold steel in vacuum chamber |
| CN113337680A (en) * | 2021-05-19 | 2021-09-03 | 湖南华菱涟钢特种新材料有限公司 | Duplex steel and method for producing same |
| CN114525380A (en) * | 2022-02-21 | 2022-05-24 | 广东韶钢松山股份有限公司 | Method for treating RH furnace dip pipe blockage |
| CN114525380B (en) * | 2022-02-21 | 2023-09-05 | 广东韶钢松山股份有限公司 | Method for treating blockage of dip pipe of RH furnace |
| CN114645111A (en) * | 2022-03-25 | 2022-06-21 | 广东韶钢松山股份有限公司 | Anti-blocking method for dip pipe of RH furnace |
| RU2816075C1 (en) * | 2023-02-02 | 2024-03-26 | Акционерное общество Акционерная холдинговая Компания "Всероссийский научно-исследовательский и проектно-конструкторский институт металлургического машиностроения имени академика Целикова" (АО АХК "ВНИИМЕТМАШ") | Vacuum vessel |
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Application publication date: 20130102 |