CN103103443A - Bearing steel GCr15 production technology capable of preventing plugging of continuous casting water gap - Google Patents
Bearing steel GCr15 production technology capable of preventing plugging of continuous casting water gap Download PDFInfo
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- CN103103443A CN103103443A CN2012105865973A CN201210586597A CN103103443A CN 103103443 A CN103103443 A CN 103103443A CN 2012105865973 A CN2012105865973 A CN 2012105865973A CN 201210586597 A CN201210586597 A CN 201210586597A CN 103103443 A CN103103443 A CN 103103443A
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Abstract
The invention relates to a bearing steel GCr15 production technology capable of preventing the plugging of a continuous casting water gap. The technology route comprises the steps of a top and bottom combined blow converter, an LF refining furnace, VD vacuum degassing and six-strand billet continuous casting of a Comcast six machine in sequence, the top and bottom combined blow converter conducts dephosphorization by adopting a double-slag method, the high catch carbon [C] at finishing point is more than or equal to 0.25%, final slag alkalinity before tapping is over 3.5, Als content in the molten steel in refining of the LF refining furnace is controlled to be over 0.05%, and Als/Alt is more than 95%; and argon blowing protection is conducted in the whole process of the continuous casting procedures, and low-pulling rate weak-cooling technology is adopted. Under the conditions of the technology, the cleanness of the molten steel can be improved, the non-metallic inclusion can be reduced, the plugging phenomenon of the continuous casting water gap can be prevented, the quality of the continuous casting blank can be improved, and the cost of the casting blank can be lowered, thereby finally improving the product quality.
Description
Technical field
The invention belongs to the metallurgical technology technical field, particularly a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up.
Background technology
Bearing is " heart of industry ", and bearing steel is one of steel class that in the special steel product, production difficulty is larger, and wherein the cleanliness factor of molten steel is the most important technical indicator that affects the bearing steel performance.The bearing steel of high cleanliness, the oxygen content in steel general control is 5～8 * 10
-6%, this just must control with aluminium deoxidation the content of oxygen in steel.
The phenomenon of nozzle clogging often can occur in continuous casting when production contains the aluminum steel kind, especially for aluminium-deoxidized beating steel GCr15, finished product aluminium content is 0.035% left and right approximately, and the Submerged Nozzle Clogging Course phenomenon often occurs in continuous casting is produced.Stop up the mouth of a river when serious, can cause that pulling rate reduces, the mould liquid level fluctuation is large, to such an extent as to nozzle clogging, liquid steel temperature is low melts down, and even can cause the continuous caster stopping accident.Therefore, nozzle clogging had both affected continuous casting billet quality, had affected again normal Production Flow Chart, had also limited many heats and had even watered, and had increased the strand cost.
Generally the smelting technology of GCr15 is: converter operation, the converter process of former smelting GCr15, terminal point catch carbon 〉=0.09, finishing slag basicity＞3.0; The LF refining procedure, originally the LF refining procedure is when smelting GCr15, and in the control molten steel, Alt content greater than 0.050%, is not controlled for Als/Alt; The VD operation, soft blow argon time 5min; Continuous casting working procedure, M-EMS adopts electric current 400A, frequency 2.5Hz, adopts strong cold high pulling rate technique.
The major cause that causes continuous casting to stop up the mouth of a river is that in molten steel, the Al2O3 inclusion is too high, the perhaps further generation of Al2O3 in casting process.
Summary of the invention
The present invention provides a kind of beating steel GCr15 production technique that prevents the continous casting sprue obstruction that can improve Cleanliness of Molten Steel, reduce non-metallic inclusion for solving the technical problem that exists in known technology.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is:
A kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up, operational path comprises top and bottom combined blown converter → LF refining furnace → VD vacuum outgas → Comcast 6 machine 6 stream billet continuous castings, it is characterized in that, described top and bottom combined blown converter adopts the double slag process dephosphorization, the high catch carbon of terminal point [C] 〉=0.25%, before tapping, finishing slag basicity is greater than 3.5; Als content＞0.05% in described refining furnace refining controlling molten steel composition, Als/Alt＞95%; In described continuous casting working procedure, whole process is carried out blowing argon, adopts the weak cold technique of low pulling rate.
1630 ℃～1650 ℃ of described Tapping Temperature of Bofs, the ladle temperature is strictly controlled slag under converter higher than 800 ℃, and the lower quantity of slag＜50mm is thick.
Described LF refining furnace molten steel departures target composition: C:0.98～1.0%, Si:0.20～0.22%, Mn:0.34～0.36%, Cr:1.50～1.55%, P≤0.015%, S≤0.010%, Ti＜20ppm.
Described LF refining furnace refining time was greater than 50 minutes.
Adopt the soft blow pattern in described VD vacuum outgas operation, soft blow argon 5～10min before the VD departures, VD out-station temperature: open and water 1520 ℃ ± 3 ℃, the first stove, connect and water 1500 ℃ ± 3 ℃, stove.
The weak cold technique of described low pulling rate, pulling rate 1.8m/min, secondary cooling raio water yield 0.8L/kg.
Adopt M-EMS and end induction stirring, described end induction stirring electric current 500A, frequency 12Hz, described M-EMS Current 350A, frequency 2Hz in described continuous casting working procedure.
Mould liquid level fluctuation control＜± 3% during described M-EMS.
Advantage and positively effect that the present invention has are: the present invention is by the smelting of converter and LF refining furnace; control Als content＞0.05% in the molten steel composition; Als/Alt＞95%, whole process is carried out blowing argon in continuous casting working procedure, has avoided the secondary oxidation of molten steel; improved Cleanliness of Molten Steel; reduce non-metallic inclusion, can prevent the continous casting sprue latch up phenomenon, improved continuous casting billet quality; reduce the strand cost, finally improved quality product.
Embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and be described in detail as follows:
A kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up, operational path comprise top and bottom combined blown converter → LF refining furnace → VD vacuum outgas → Comcast 6 machine 6 stream billet continuous castings, produce altogether 6 stoves.
(1) converter operation
Double slag process dephosphorization, the high catch carbon of terminal point [C] 〉=0.25% are adopted in converter; Before tapping, require finishing slag basicity greater than 3.5,1630 ℃～1650 ℃ of tapping temperatures, the ladle temperature is strictly controlled slag under converter higher than 800 ℃, and the lower quantity of slag＜50mm is thick.
| Heat (batch) number | End point carbon [C] % | Tapping temperature ℃ | Finishing slag basicity |
| 3106738 | 0.25 | 1635 | 3.62 |
| 3106740 | 0.27 | 1633 | 3.81 |
| 2107267 | 0.31 | 1637 | 3.73 |
| 2107269 | 0.28 | 1643 | 3.65 |
| 3106747 | 0.29 | 1639 | 3.58 |
[0022]?
| 3106746 | 0.27 | 1641 | 3.70 |
(2) LF refining procedure
Diffusive deoxidation is adopted in refining, makes the foaming white slag, notes arc-covering slag operation, and omnidistance control aluminium requires Als＞0.050%, more than half hello the aluminium of forbidding of refining cycle; Molten steel departures Als/Alt＞95%; Molten steel departures target composition: C:0.98～1.0%, Si:0.20～0.22%, Mn:0.34～0.36%, Cr:1.50～1.55%, P≤0.015%, S≤0.010%, Ti＜20ppm; Refining time is greater than 50 minutes, to promote inclusion floating, improves the molten steel purity.
| Heat (batch) number | 3106738 | 3106740 | 2107267 | 2107269 | 3106747 | 3106746 |
| C% | 0.99 | 0.99 | 0.98 | 1.00 | 0.99 | 0.99 |
| Si% | 0.22 | 0.22 | 0.21 | 0.22 | 0.20 | 0.22 |
| Mn% | 0.35 | 0.35 | 0.34 | 0.35 | 0.35 | 0.35 |
| Cr% | 1.52 | 1.53 | 1.51 | 1.53 | 1.54 | 1.52 |
| P% | 0.009 | 0.009 | 0.010 | 0.008 | 0.010 | 0.010 |
| S% | 0.003 | 0.005 | 0.003 | 0.006 | 0.004 | 0.005 |
| Ti(ppm) | 1 | 0 | 0 | 0 | 1 | 0 |
| Als% | 0.071 | 0.053 | 0.06 | 0.062 | 0.059 | 0.064 |
| Als/Alt | 98.3% | 99.1% | 100.0% | 99.7% | 95.8% | 98.0% |
(3) VD vacuum outgas operation
Keep 67Pa high vacuum time 15min, in order to promote inclusion floating, improve Molten Steel Cleanliness, increase Al in molten steel
2O
3Floatation Rate, adopt the soft blow pattern, soft blow argon 5～10min before the VD departures, the VD out-station temperature: open and water 1520 ℃ ± 3 ℃, the first stove, 1500 ℃ ± 3 ℃, stove waters in company.
(4) continuous casting working procedure
For avoiding the secondary oxidation of molten steel, whole process is carried out blowing argon, 30 ℃ of tundish superheating temperature; Use M-EMS (electric current 350A, frequency 2Hz), end induction stirring (electric current 500A, frequency 12Hz), mould liquid level fluctuation control＜± 3% is to reduce the impact of foreign impurity; Adopt the weak cold technique of low pulling rate, pulling rate 1.8m/min, secondary cooling raio water yield 0.8L/kg.
The present invention is by adopting above production technique, process modifications under the appointed conditions such as use 120t top and bottom combined blown converter, 120tLF refining furnace, 120t vacuum refining furnace, Comcast 6 machines 6 stream arc square billet continuous casting machines and perfect, finally determined the new production technique of GCr15, prevented the nozzle clogging phenomenon of GCr15 steel grade in casting cycle, improved Cleanliness of Molten Steel, reduced non-metallic inclusion, can prevent the continous casting sprue latch up phenomenon, improved continuous casting billet quality, reduce the strand cost, finally improved quality product.
Claims (8)
1. beating steel GCr15 production technique that prevents that continous casting sprue from stopping up, operational path comprises top and bottom combined blown converter → LF refining furnace → VD vacuum outgas → Comcast 6 machine 6 stream billet continuous castings, it is characterized in that, described top and bottom combined blown converter adopts the double slag process dephosphorization, the high catch carbon of terminal point [C] 〉=0.25%, before tapping, finishing slag basicity is greater than 3.5; Als content＞0.05% in described LF refining furnace refining controlling molten steel composition, Als/Alt＞95%; In described continuous casting working procedure, whole process is carried out blowing argon, adopts the weak cold technique of low pulling rate.
2. a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up according to claim 1, is characterized in that, 1630 ℃～1650 ℃ of described Tapping Temperature of Bofs, and the ladle temperature is strictly controlled slag under converter higher than 800 ℃, and the lower quantity of slag＜50mm is thick.
3. a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up according to claim 1, it is characterized in that, described LF refining furnace molten steel departures target composition: C:0.98～1.0%, Si:0.20～0.22%, Mn:0.34～0.36%, Cr:1.50～1.55%, P≤0.015%, S≤0.010%, Ti＜20ppm.
4. a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up according to claim 1, is characterized in that, described LF refining furnace refining time was greater than 50 minutes.
5. a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up according to claim 1, it is characterized in that, adopt the soft blow pattern in described VD vacuum outgas operation, soft blow argon 5～10min before the VD departures, VD out-station temperature: open and water 1520 ℃ ± 3 ℃, the first stove, connect and water 1500 ℃ ± 3 ℃, stove.
6. a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up according to claim 1, is characterized in that, the weak cold technique of described low pulling rate, pulling rate 1.8m/min, secondary cooling raio water yield 0.8L/kg.
7. a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up according to claim 1, it is characterized in that, adopt M-EMS and end induction stirring in described continuous casting working procedure, described end induction stirring electric current 500A, frequency 12Hz, described M-EMS Current 350A, frequency 2Hz.
8. a kind of beating steel GCr15 production technique that prevents that continous casting sprue from stopping up according to claim 7, is characterized in that, mould liquid level fluctuation control＜± 3% during described M-EMS.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104057051A (en) * | 2013-09-13 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of billet continuous casting bearing steel |
| CN104561730A (en) * | 2014-12-22 | 2015-04-29 | 天津钢铁集团有限公司 | Method for producing GCr15 bearing steel billets |
| CN105369013A (en) * | 2015-12-09 | 2016-03-02 | 武汉钢铁(集团)公司 | Method for controlling content of N in bearing steel GCr15 |
| CN108796348A (en) * | 2018-06-08 | 2018-11-13 | 河钢股份有限公司 | A kind of smelting process of high-carbon aluminum killed steel |
| CN110125356A (en) * | 2019-04-26 | 2019-08-16 | 首钢集团有限公司 | A kind of continuous small-billet casting production method of drilling tool cored steel |
| CN110527909A (en) * | 2019-09-11 | 2019-12-03 | 本钢板材股份有限公司 | A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J |
| CN110665970A (en) * | 2019-10-08 | 2020-01-10 | 武汉钢铁集团鄂城钢铁有限责任公司 | Production method of GCr15 hot rolled strip steel for spinning |
| CN112267058A (en) * | 2020-09-09 | 2021-01-26 | 邯郸钢铁集团有限责任公司 | Method for increasing number of continuous-drawing bearing steel furnaces of 8-machine 8-strand continuous casting machine |
| CN113092712A (en) * | 2021-02-26 | 2021-07-09 | 邯郸钢铁集团有限责任公司 | Quality evaluation method for casting blank of exposed part of outer plate for high-end automobile |
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| CN102418041A (en) * | 2011-12-09 | 2012-04-18 | 内蒙古包钢钢联股份有限公司 | Production method for bearing steel |
| CN102517419A (en) * | 2011-12-21 | 2012-06-27 | 天津钢铁集团有限公司 | Smelting continuous casting method for high carbon steel |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104057051A (en) * | 2013-09-13 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of billet continuous casting bearing steel |
| CN104057051B (en) * | 2013-09-13 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of small square billet continuous casting bearing steel |
| CN104561730A (en) * | 2014-12-22 | 2015-04-29 | 天津钢铁集团有限公司 | Method for producing GCr15 bearing steel billets |
| CN104561730B (en) * | 2014-12-22 | 2016-09-07 | 天津钢铁集团有限公司 | A kind of production method of GCr15 Bearing Steel Billet |
| CN105369013A (en) * | 2015-12-09 | 2016-03-02 | 武汉钢铁(集团)公司 | Method for controlling content of N in bearing steel GCr15 |
| CN105369013B (en) * | 2015-12-09 | 2018-06-19 | 武汉钢铁有限公司 | The method for controlling N content in GCr15 bearing steels |
| CN108796348A (en) * | 2018-06-08 | 2018-11-13 | 河钢股份有限公司 | A kind of smelting process of high-carbon aluminum killed steel |
| CN110125356A (en) * | 2019-04-26 | 2019-08-16 | 首钢集团有限公司 | A kind of continuous small-billet casting production method of drilling tool cored steel |
| CN110527909A (en) * | 2019-09-11 | 2019-12-03 | 本钢板材股份有限公司 | A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J |
| CN110665970A (en) * | 2019-10-08 | 2020-01-10 | 武汉钢铁集团鄂城钢铁有限责任公司 | Production method of GCr15 hot rolled strip steel for spinning |
| CN110665970B (en) * | 2019-10-08 | 2020-12-25 | 宝武集团鄂城钢铁有限公司 | Production method of GCr15 hot rolled strip steel for spinning |
| CN112267058A (en) * | 2020-09-09 | 2021-01-26 | 邯郸钢铁集团有限责任公司 | Method for increasing number of continuous-drawing bearing steel furnaces of 8-machine 8-strand continuous casting machine |
| CN112267058B (en) * | 2020-09-09 | 2021-11-19 | 邯郸钢铁集团有限责任公司 | Method for increasing number of continuous-drawing bearing steel furnaces of 8-machine 8-strand continuous casting machine |
| CN113092712A (en) * | 2021-02-26 | 2021-07-09 | 邯郸钢铁集团有限责任公司 | Quality evaluation method for casting blank of exposed part of outer plate for high-end automobile |
| CN113092712B (en) * | 2021-02-26 | 2023-05-09 | 邯郸钢铁集团有限责任公司 | Method for evaluating quality of casting blank of outer plate exposed part for high-end automobile |
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