CN103602784A - Method for deoxidizing in RH (Relative Humidity) vacuum furnace - Google Patents
Method for deoxidizing in RH (Relative Humidity) vacuum furnace Download PDFInfo
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- CN103602784A CN103602784A CN201310584893.4A CN201310584893A CN103602784A CN 103602784 A CN103602784 A CN 103602784A CN 201310584893 A CN201310584893 A CN 201310584893A CN 103602784 A CN103602784 A CN 103602784A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 69
- 239000010959 steel Substances 0.000 claims abstract description 69
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000001301 oxygen Substances 0.000 claims abstract description 33
- 238000005275 alloying Methods 0.000 claims abstract description 29
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 238000007670 refining Methods 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 239000007921 spray Substances 0.000 abstract description 3
- 229910000655 Killed steel Inorganic materials 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for deoxidizing in an RH (Relative Humidity) vacuum furnace. The method comprises the steps of smelting in a converter, and then, directly treating molten steel in the RH vacuum furnace; adding a carburant for deoxidizing into the vacuum furnace, wherein the addition amount of the carburant is calculated according to the formula: m=(T0+Tascend-Tdescend-Ttarget)*0.02kg/ton steel or m=[(Odestination-Obefore alloying+200)/1.33-Cdestination]*0.0012kg/t, the addition amounts are respectively calculated according to the both formulas, and finally, the smaller value is considered as the addition amount; when the calculated m value does not exceed 20kg, finishing adding at one step; when the m value exceeds 20kg, adding in batches, wherein the highest addition amount in each batch is 20kg, the adding time interval is not shorter than 10s, and the adding process is finished within 6min; carrying out the following processes as usual. According to the invention, the sharp reaction spray can not be generated because the carburant is added under a vacuum condition, thus the oxygen content before the molten steel is alloyed can be reduced through subjecting the carburant and oxygen in the molten steel to reaction, the purity of the molten steel can be increased, and the consumption of aluminum cut wire shots in every ton of steel can be reduced to below 1.1kg.
Description
Technical field
the present invention relates to remove in a kind of smelting molten steel the method for harmful element, belong to particularly a kind of method of deoxidation in RH vacuum oven, while being specially adapted to produce carbon aluminium-killed steel and ultra low-carbon steel in RH vacuum oven the method for deoxidation.
Background technology
when carbon aluminium-killed steel and ultra low-carbon steel are produced in converter, tapping carbon is controlled at 0.03% ~ 0.06% conventionally, and the oxygen level of corresponding tapping is generally at 400 ~ 800ppm, and the oxygen of tapping in misoperation situation is higher.Under the technology mode of the pre-deoxidation of not tapping, the oxygen level in vacuum oven is greater than 400ppm conventionally.Under traditional RH vacuum refining process, vacuum cycle process reaction between carbon and oxygen can obtain compared with low carbon content level, but the oxygen level of the high heat of molten steel of oxygen level before alloying is still higher.For this reason, when molten steel final deoxygenation, take the mode that adds aluminum shot to complete deoxidation.Aluminium is as conventional deoxygenated alloy, and not only relative price is expensive, and its deoxidation products, if AL2O3 floating is removed and insufficiently will be formed inclusion and affect the purity of molten steel.
according to the thermodynamical equilibrium equation of reaction between carbon and oxygen, under vacuum-treat condition, carbon is good reductor, and C, O reaction product be CO gas, by pump system, taken away, do not pollute molten steel, improved the purity of molten steel.And the price of carburelant is well below aluminum shot, economical and practical, reduce production costs.RH vacuum utilizes carbon to carry out deoxidation as reductor, can reduce AL2O3 and be mingled with.Due to reaction between carbon and oxygen product C, O can not pollute molten steel, and carbon deoxidation is the cleanest reductor of generally acknowledging always.But add carburelant under vacuum condition, force deoxidation, react very violent, add carburelant operation and control and improperly may cause the security incidents such as splash, blast; And the vigorous splash in vacuum chamber causes vacuum chamber inwall dross seriously to make top vent internal diameter diminish, and affects the metallurgical function of RH vacuum; In RH vacuum, add carburelant deoxidation and may produce detrimentally affect to steel quality: affect the accurate control of carbon content and form adverse current in breaking of vacuum pipe, circulation flow of hot metal is declined, cause the alloying constituent can not be even timely, inclusion can not effectively be removed.Based on above disadvantageous effect, therefore cause not implementing effectively by the method for carburelant deoxidation.If can effectively control the reaction severe degree of adding after carburelant, make it safe and feasible, just can make the application of carburelant method of deoxidation and actual production.
when converter tapping too high oxygen level, corresponding carbon content is in lower level.Therefore,, even carbon content is carried out deoxidation utilize molten steel under vacuum condition in, before alloying, oxygen level more than needed is still compared with high and can not meet the demands.If can make in molten steel carbon oxygen content substantially suitable, can utilize reaction between carbon and oxygen to fall steel oxygen content in water and be reduced to lower level.
Summary of the invention
the present invention is directed to the deficiencies in the prior art, provide a kind of when smelting low carbon aluminium killed steel and ultra low-carbon steel, by add carburelant in the molten steel of rich oxygen content in RH vacuum-treat process, and control vacuum tightness and adjust the method that carburelant adds, make to add carburelant can not produce vigorous reaction under vacuum condition and spray quick-fried problem, thereby realizing utilizes carburelant to react with the oxygen in molten steel, reduce the oxygen level before molten steel alloying, reach raising Molten Steel Cleanliness, reduce the method for the deoxidation in RH vacuum oven of aluminum shot consumption.
realize the measure of above-mentioned purpose:
a method for deoxidation in RH vacuum oven, its step:
1) after converter smelting, molten steel directly enters RH vacuum oven and carries out vacuum-treat, and makes tapping temperature improve 10 ~ 15 ℃ than conventional tapping temperature;
2) in RH vacuum oven, add carburelant to carry out deoxidation: in control stove, vacuum tightness is at 4～6KPa; Carry out in vacuum treated 6 minutes from starting, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 3～4kg/ ℃ of meter; The add-on of carburelant is calculated according to following formula:
m=(fall-T of T0+ T liter-T target) * 0.02 kg/ ton steel or
before arrive at a station-O of m=[(O alloying+200) ÷ 1.33-C arrives at a station] * 0.0012 kg/t
in formula: m-represents carburelant add-on, unit is: kg/ ton steel;
molten steel temperature when T0-represents that the vacuum-treat of RH stove starts, unit is: ℃;
the temperature drop Shuo， unit that T falls-represents in molten steel vacuum refining process is: ℃;
intensification Shuo， unit in T liter-expression molten steel alloying process is: ℃;
temperature when T target-expression molten steel target finishes, unit is: ℃;
the O oxygen level of molten steel during to RH stove of arriving at a station-represent, unit is: ppm;
before O alloying-and represent the content of oxygen before molten steel alloying, i.e. decarburization terminal oxygen level, unit is: ppm;
the C carbon content of molten steel during to RH stove of arriving at a station-represent, unit is: ppm;
it should be noted that, two formula are all calculated, the add-on that finally to get value that result is little be carburelant;
when the m value of calculating is during over 20 kg, disposable adding; When m value surpasses 20 kg, take to add mode in batches, every crowd of the highest 20kg that is defined as of add-on, joining day interval was not less than for 10 seconds, and required to add in 6 minutes;
3) according to routine, carry out rear operation.
the effect of master operation in the present invention
by add carburelant in the molten steel of rich oxygen content in RH vacuum-treat process, and control vacuum tightness and adjust the method that carburelant adds, make to add carburelant can not produce vigorous reaction under vacuum condition and spray quick-fried problem, thereby realizing utilizes carburelant to react with the oxygen in molten steel, reduce the oxygen level before molten steel alloying, improve Molten Steel Cleanliness.
the present invention compared with prior art, its feature:
1, solved under traditional technology and can only the front oxygen level of molten steel alloying fallen on a year-on-year basis more than 20% by adding the situation of a large amount of aluminium alloy deoxidations in Molten Steel over-oxidation situation, from 400pm, be down to below 250ppm above.
, use carburelant as reductor, its product C O can not pollute molten steel, and has reduced the Oxygen Content in Liquid Steel before alloying, has reduced AL2O3 and has been mingled with, and has improved the purity of molten steel.
, use carburelant as reductor in RH vacuum oven, can also significantly reduce production costs, even if aluminum shot unit consumption is reduced to below 1.1Kg/ ton steel from 1.40Kg/ ton steel.
Embodiment
below the present invention is described in detail:
embodiment 1
a method for deoxidation in RH vacuum oven, its step:
1) after converter smelting, molten steel directly enters RH vacuum oven and carries out vacuum-treat, and makes tapping temperature improve 10 ℃ than conventional tapping temperature.
) in RH vacuum oven, adding carburelant to carry out deoxidation: in stove, vacuum tightness is at 5KPa; Carry out before vacuum treated 6 minutes from starting, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 3 ℃/min of meters; The add-on of carburelant is calculated according to following formula: known: 1622 ℃ of T0=, and T liter=13 ℃, T falls=and 35 ℃, T target=1590 ℃, arrive at a station=610ppm of O,
before O alloying=and 230ppm, arrive at a station=355 ppm of C bring respectively following formula into,
m=(fall-T of T0+ T liter-T target) * 0.02 kg/t or
before arrive at a station-O of m=[(O alloying+200) ÷ 133-C arrives at a station] * 0.0012 kg/t
as calculated, under 200t molten steel amount, carburelant add-on is respectively 40 kg and 19.5 kg, the add-on that to get value that result is little be carburelant, and the add-on of this carburelant is 19.5kg;
because the m value of calculating is over 20 kg, therefore it is over 45 seconds time disposable adding;
3) according to routine, carry out rear operation.
by statistics, when adding carburelant to carry out deoxidation, there is not splash phenomenon in RH vacuum oven; Before molten steel alloying, oxygen level dropped to 230 ppm by former 400 ppm left and right, compared and had declined 42.5%; Aluminum shot unit consumption is 1.03Kg/ ton steel.
embodiment 2
a method for deoxidation in RH vacuum oven, its step:
1) after converter smelting, molten steel directly enters RH vacuum oven and carries out vacuum-treat, and makes tapping temperature improve 15 ℃ than conventional tapping temperature;
2) in RH vacuum oven, add carburelant to carry out deoxidation: in stove, vacuum tightness is at 6KPa; Carry out before vacuum treated 6 minutes from starting, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4kg/ ℃ of meter; The add-on of carburelant is calculated according to following formula: known: 1627 ℃ of T0=, and T liter=17.5 ℃, T falls=and 35 ℃, T target=1590 ℃, arrive at a station=720ppm of O,
before O alloying=and 230ppm, arrive at a station=305ppm of C brings respectively following formula into,
m=(fall-T of T0+ T liter-T target) * 0.02 kg/t or
before arrive at a station-O of m=[(O alloying+200) ÷ 133-C arrives at a station] * 0.0012 kg/t
as calculated, under 200t molten steel amount, carburelant add-on is respectively 78kg and 51kg, the add-on that to get value that result is little be carburelant, and the add-on of this carburelant is 51kg;
because the m value of calculating has surpassed 20 kg, therefore its minute 3 property before 3 minutes are added; For the first time, add-on is 20 kg for the second time, add-on is 11 kg for the third time;
3) according to routine, carry out rear operation.
by statistics, when adding carburelant to carry out deoxidation, there is not splash phenomenon in RH vacuum oven; Before molten steel alloying, oxygen level dropped to 230 ppm by should be in the past 510 ppm left and right, compared and had declined 54.9%; Aluminum shot unit consumption is 1.02Kg/ ton steel.
embodiment 3
a method for deoxidation in RH vacuum oven, its step:
1) after converter smelting, molten steel directly enters RH vacuum oven and carries out vacuum-treat, and makes tapping temperature improve 12 ℃ than conventional tapping temperature;
2) in RH vacuum oven, add carburelant to carry out deoxidation: in stove, vacuum tightness is at 6KPa; Carry out before vacuum treated 6 minutes from starting, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4kg/ ℃ of meter; The add-on of carburelant is calculated according to following formula: known: 1625 ℃ of T0=, and T liter=17 ℃, T falls=and 35 ℃, T target=1590 ℃, arrive at a station=690ppm of O,
before O alloying=and 230ppm, arrive at a station=300ppm of C brings respectively following formula into,
m=(fall-T of T0+ T liter-T target) * 0.02 kg/t or
before arrive at a station-O of m=[(O alloying+200) ÷ 133-C arrives at a station] * 0.0012 kg/t
as calculated, carburelant add-on is respectively 70kg and 47kg, the add-on that to get value that result is little be carburelant, and the add-on of this carburelant is 47kg;
because the m value of calculating has surpassed 20 kg, therefore its minute 3 property before 3 minutes are added and are over; For the first time, add-on is 20 kg for the second time, add-on is 7 kg for the third time;
3) according to routine, carry out rear operation.
by statistics, when adding carburelant to carry out deoxidation, there is not splash phenomenon in RH vacuum oven; Before molten steel alloying, oxygen level dropped to 230 ppm by should be in the past 490 ppm left and right, compared and had declined 53.0%; Aluminum shot unit consumption is 1.01Kg/ ton steel.
embodiment 4
a method for deoxidation in RH vacuum oven, its step:
1) after converter smelting, molten steel directly enters RH vacuum oven and carries out vacuum-treat, and makes tapping temperature improve 15 ℃ than conventional tapping temperature;
2) in RH vacuum oven, add carburelant to carry out deoxidation: in stove, vacuum tightness is at 5KPa; Carry out before vacuum treated 6 minutes from starting, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4 ℃/min of meters; The add-on of carburelant is calculated according to following formula: known: 1620 ℃ of T0=, and T liter=10 ℃, T falls=and 35 ℃, T target=1590 ℃, arrive at a station=580ppm of O,
before O alloying=and 230ppm, arrive at a station=362ppm of C brings respectively following formula into,
m=(fall-T of T0+ T liter-T target) * 0.02 kg/t or
before arrive at a station-O of m=[(O alloying+200) ÷ 133-C arrives at a station] * 0.0012 kg/t
as calculated, carburelant add-on is respectively 20 kg and 12kg, the add-on that to get value that result is little be carburelant, and the add-on of this carburelant is 12kg;
because the m value of calculating is less than 20 kg, therefore its disposable adding before 1 minute is over.
) according to routine, carry out rear operation.
by statistics, when adding carburelant to carry out deoxidation, there is not splash phenomenon in RH vacuum oven; Before molten steel alloying, oxygen level dropped to 230 ppm by should be in the past 300 ppm left and right, compared and had declined 22.8%; Aluminum shot unit consumption is 1.0Kg/ ton steel.
embodiment 5
a method for deoxidation in RH vacuum oven, its step:
1) after converter smelting, molten steel directly enters RH vacuum oven and carries out vacuum-treat, and makes tapping temperature improve 15 ℃ than conventional tapping temperature;
2) in RH vacuum oven, add carburelant to carry out deoxidation: in stove, vacuum tightness is at 4KPa; Carry out before vacuum treated 6 minutes from starting, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4 ℃/min of meters; The add-on of carburelant is calculated according to following formula: known: 1630 ℃ of T0=, and T liter=27 ℃, T falls=and 35 ℃, T target=1590 ℃, arrive at a station=896ppm of O,
before O alloying=and 230ppm, arrive at a station=234ppm of C brings respectively following formula into,
m=(fall-T of T0+ T liter-T target) * 0.02 kg/t or
before arrive at a station-O of m=[(O alloying+200) ÷ 133-C arrives at a station] * 0.0012 kg/t
as calculated, carburelant add-on is respectively 128kg and 100kg, the add-on that to get value that result is little be carburelant, and the add-on of this carburelant is 100kg;
because the m value of calculating has surpassed 20 kg, therefore its minute 5 property before 5 minutes are added and are over; Each add-on is 20kg.
) according to routine, carry out rear operation.
by statistics, when adding carburelant to carry out deoxidation, there is not splash phenomenon in RH vacuum oven; Before molten steel alloying, oxygen level dropped to 230 ppm by should be in the past 780 ppm left and right, compared and had declined 70.5%; Aluminum shot unit consumption is 1.025Kg/ ton steel.
above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (1)
1. a method for deoxidation in RH vacuum oven, its step:
1) after converter smelting, molten steel directly enters RH vacuum oven and carries out vacuum-treat, and makes tapping temperature improve 10 ~ 15 ℃ than conventional tapping temperature;
2) in RH vacuum oven, add carburelant to carry out deoxidation: in control stove, vacuum tightness is at 4～6KPa; Carry out in vacuum treated 6 minutes from starting, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 3～4kg/ ℃ of meter; The add-on of carburelant is calculated according to following formula:
M=(T
0+ T
rise-T
fall-T
target) * 0.02 kg/ ton steel or
M=[(O
arrive at a station-O
before alloying+ 200) ÷ 1.33-C
arrive at a station] * 0.0012 kg/t
In formula: m-expression carburelant add-on, unit is: kg/ ton steel;
T
0-representing the molten steel temperature when vacuum-treat of RH stove starts, unit is: ℃;
T
fall-represent that the temperature drop Shuo， unit in molten steel vacuum refining process is: ℃;
T
rise-represent that the intensification Shuo， unit in molten steel alloying process is: ℃;
T
target-representing temperature when molten steel target finishes, unit is: ℃;
O
arrive at a station-representing oxygen level when molten steel is to RH stove, unit is: ppm;
O
before alloying-represent the content of oxygen before molten steel alloying, i.e. decarburization terminal oxygen level, unit is: ppm;
C
arrive at a station-representing carbon content when molten steel is to RH stove, unit is: ppm;
It should be noted that, two formula are all calculated, the add-on that finally to get value that result is little be carburelant;
When the m value of calculating is during over 20 kg, disposable adding; When m value surpasses 20 kg, take to add mode in batches, every crowd of the highest 20kg that is defined as of add-on, joining day interval was not less than for 10 seconds, and required to add in 6 minutes;
3) according to routine, carry out rear operation.
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|---|---|---|---|---|
| CN105002328A (en) * | 2015-07-17 | 2015-10-28 | 邯钢集团邯宝钢铁有限公司 | IF steel RH vacuum recarburization deoxygenation control method |
| CN105002328B (en) * | 2015-07-17 | 2017-03-22 | 邯钢集团邯宝钢铁有限公司 | IF steel RH vacuum recarburization deoxygenation control method |
| CN105950830A (en) * | 2016-05-30 | 2016-09-21 | 本钢板材股份有限公司 | H08-series steel type RH furnace light-treatment refining method |
| CN106011385A (en) * | 2016-06-21 | 2016-10-12 | 首钢京唐钢铁联合有限责任公司 | Smelting method for non-sedated molten steel |
| CN106011384A (en) * | 2016-06-21 | 2016-10-12 | 首钢京唐钢铁联合有限责任公司 | Method for smelting non-sedating molten steel |
| CN106086309A (en) * | 2016-08-16 | 2016-11-09 | 武汉钢铁股份有限公司 | A kind of method that can accurately control Ultra-low carbon high-oxygen steel oxygen content in steel |
| CN106191376B (en) * | 2016-08-24 | 2018-07-24 | 武汉钢铁有限公司 | Ultra-low carbon aluminum killed steel vacuum adds carbon pre-deoxidizing technology |
| CN106282488A (en) * | 2016-09-07 | 2017-01-04 | 舞阳钢铁有限责任公司 | A kind of steel ingot that improves is become a useful person the process of thickness |
| CN110777235A (en) * | 2019-10-17 | 2020-02-11 | 山东钢铁集团日照有限公司 | Method for promoting temperature drop of molten low-carbon aluminum killed steel in RH process |
| CN110846470A (en) * | 2019-12-03 | 2020-02-28 | 本钢板材股份有限公司 | Method for accurately controlling carbon content in RH refined low-carbon steel |
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Effective date of registration: 20170714 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: WUHAN IRON AND STEEL Co.,Ltd. Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: WUHAN IRON AND STEEL (GROUP) Corp. |
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