CN103602784B - A kind of method of deoxidation in RH vacuum oven - Google Patents
A kind of method of deoxidation in RH vacuum oven Download PDFInfo
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- CN103602784B CN103602784B CN201310584893.4A CN201310584893A CN103602784B CN 103602784 B CN103602784 B CN 103602784B CN 201310584893 A CN201310584893 A CN 201310584893A CN 103602784 B CN103602784 B CN 103602784B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 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 39
- 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 31
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 238000005304 joining Methods 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 23
- 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
- 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 10
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 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
- 239000004411 aluminium Substances 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006392 deoxygenation reaction 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A kind of method of deoxidation in RH vacuum oven: after converter smelting, molten steel directly enters RH vacuum oven and processes; Add carburelant deoxidation in a vacuum furnace: carburelant add-on calculates according to: m=(-T target falls in T0+T liter-T) × 0.02kg/ ton steel or m=[(O arrive at a station-O alloying before+200) ÷ 1.33-C arrives at a station] × 0.0012kg/t, two formula are all calculated, and finally getting the little value of result is add-on; When the m value calculated is not more than 20kg, then disposablely to add; When m value is more than 20kg, then take feed postition in batches, often criticize add-on and be up to 20kg, joining day interval was not less than for 10 seconds, and added in 6 minutes; Conveniently carry out rear operation.The present invention adds carburelant under vacuum, and can not to produce vigorous reaction spray quick-fried, thus realize utilizing the oxygen in carburelant and molten steel react, and the oxygen level before reduction molten steel alloying, reaches raising Molten Steel Cleanliness, and reduction aluminum shot is consumed to below 1.1kg/ ton steel.
Description
Technical field
the present invention relates to a kind of method removing harmful element in smelting molten steel, belong to a kind of method of deoxidation in RH vacuum oven particularly, the method for deoxidation in RH vacuum oven when being specially adapted to produce carbon aluminium-killed steel and ultra low-carbon steel.
Background technology
when converter producing carbon aluminium-killed steel and ultra low-carbon steel, tapping carbon controls usually 0.03% ~ 0.06%, and the oxygen level of corresponding tapping is generally at 400 ~ 800ppm, and oxygen of tapping in misoperation situation is higher.Under the technology mode not carrying out tapping pre-deoxidation, be usually greater than 400ppm to the oxygen level in vacuum oven.Under traditional RH vacuum refining process, vacuum cycle process reaction between carbon and oxygen can obtain comparatively low carbon content level, but the high oxygen level of heat of molten steel before alloying of oxygen level is still higher.For this reason, the mode adding aluminum shot is taked to complete deoxidation when molten steel final deoxygenation.Aluminium is as conventional deoxygenated alloy, and not only relative price is expensive, and its deoxidation products, if namely AL2O3 floats to remove and insufficiently will form inclusion and affect the purity of molten steel.
according to the thermodynamical equilibrium equation of reaction between carbon and oxygen, under vacuum processing conditions, carbon is good reductor, and the product of C, O reaction is CO gas, is taken away, does not pollute molten steel, improve the purity of molten steel by pump system.And the price of carburelant is well below aluminum shot, economical and practical, reduce production cost.RH vacuum utilizes carbon to carry out deoxidation as reductor, can reduce AL2O3 and be mingled with.Because reaction between carbon and oxygen product C O can not pollute molten steel, carbon deoxidation is the cleanest generally acknowledged reductor always.But add carburelant under vacuum and carry out pressures deoxidation, reaction is very violent, add that carburelant operation control is improper may cause the security incident 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; Add carburelant deoxidation in RH vacuum and may produce detrimentally affect to steel quality: affect the accurate control of carbon content and fall formation adverse current in pipe under vacuo, circulation flow of hot metal is declined, cause 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 the reaction severe degree after adding carburelant effectively can be controlled, make it safe and feasible, carburelant method of deoxidation just can be made to apply and actual production.
when converter tapping too high oxygen level, corresponding carbon content is in lower level.Therefore, even if utilize carbon content in molten steel to carry out deoxidation under vacuum, oxygen level more than needed before alloying is still higher and can not meet the demands.If carbon oxygen content in molten steel can be made substantially suitable, then reaction between carbon and oxygen can be utilized to fall steel oxygen content in water and to be reduced to lower level.
Summary of the invention
the present invention is directed to the deficiencies in the prior art, there is provided a kind of when smelting low carbon aluminium killed steel and ultra low-carbon steel, by adding carburelant in RH vacuum process in the molten steel of rich oxygen content, and the method that control vacuum tightness adjustment carburelant adds, make to add under vacuum carburelant can not produce vigorous reaction and spray quick-fried problem, thus realize utilizing the oxygen in carburelant and molten steel to react, reduce the oxygen level before molten steel alloying, reach raising Molten Steel Cleanliness, reduce the method for the deoxidation in RH vacuum oven that aluminum shot consumes.
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 DEG C than conventional tapping temperature;
2) in RH vacuum oven, add carburelant and carry out deoxidation: in control stove, vacuum tightness is at 4 ~ 6KPa; From starting to carry out in vacuum treated 6 minutes, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 3 ~ 4kg/ DEG C of meter; The add-on of carburelant is according to following formulae discovery:
m=(-T target falls in T0+T liter-T) × 0.02kg/ ton steel or
m=[(O arrive at a station-O alloying before+200) ÷ 1.33-C arrives at a station] × 0.0012kg/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: DEG C;
temperature drop number in molten steel vacuum refining process falls-represents in T, and unit is: DEG C;
intensification number in T liter-expression molten steel alloying process, unit is: DEG C;
temperature at the end of T target-expression molten steel target, unit is: DEG C;
o arrives at a station-represents molten steel to oxygen level during RH stove, and unit is: ppm;
before O alloying-and representing the content of oxygen before molten steel alloying, i.e. decarburization terminal oxygen level, unit is: ppm;
c arrives at a station-represents molten steel to carbon content during RH stove, and unit is: ppm;
it should be noted that, two formula are all calculated, and finally getting the little value of result is the add-on of carburelant;
when the m value calculated is not more than 20kg, then disposablely to add; When m value is more than 20kg, then take feed postition in batches, often criticize 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) conveniently rear operation is carried out.
the effect of master operation in the present invention
by adding carburelant in RH vacuum process in the molten steel of rich oxygen content, and the method that control vacuum tightness adjustment carburelant adds, make to add under vacuum carburelant can not produce vigorous reaction and spray quick-fried problem, thus realize utilizing the oxygen in carburelant and molten steel to react, reduce the oxygen level before molten steel alloying, improve Molten Steel Cleanliness.
the present invention compared with prior art, its feature:
1, solving can only by adding the situation of a large amount of aluminium alloy deoxidation in Molten Steel over-oxidation situation under traditional technology, and before making molten steel alloying, oxygen level falls more than 20% on a year-on-year basis, is namely down to below 250ppm from more than 400pm.
, use carburelant as reductor, its product C O can not pollute molten steel, and reduces the Oxygen Content in Liquid Steel before alloying, decreases AL2O3 and is mingled with, and improves the purity of molten steel.
, use carburelant as reductor in RH vacuum oven, significantly can also reduce production cost, 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 DEG C than conventional tapping temperature.
) in RH vacuum oven, adding carburelant carry out deoxidation: in stove, vacuum tightness is at 5KPa; Before starting to carry out vacuum treated 6 minutes, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 3 DEG C/min of meters; The add-on of carburelant is according to following formulae discovery: known: T0=1622 DEG C, T liter=13 DEG C, and T falls=35 DEG C, T target=1590 DEG C, and O arrives at a station=610ppm,
before O alloying=and 230ppm, C arrive at a station=and 355ppm brings following formula respectively into,
m=(-T target falls in T0+T liter-T) × 0.02kg/t or
m=[(O arrive at a station-O alloying before+200) ÷ 133-C arrives at a station] × 0.0012kg/t
as calculated, under 200t molten steel amount, carburelant add-on is respectively 40kg and 19.5kg, and getting the little value of result is the add-on of carburelant, then the add-on of this carburelant is 19.5kg;
because the m value calculated is not more than 20kg, therefore its disposable adding 45 seconds time, is over;
3) conveniently rear operation is carried out.
through statistics, when adding carburelant and carry out deoxidation in RH vacuum oven, there is not expulsion events; Before molten steel alloying, oxygen level dropped to 230ppm by former about 400ppm, compared and have dropped 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 DEG C than conventional tapping temperature;
2) in RH vacuum oven, add carburelant and carry out deoxidation: in stove, vacuum tightness is at 6KPa; Before starting to carry out vacuum treated 6 minutes, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4kg/ DEG C of meter; The add-on of carburelant is according to following formulae discovery: known: T0=1627 DEG C, T liter=17.5 DEG C, and T falls=35 DEG C, T target=1590 DEG C, and O arrives at a station=720ppm,
before O alloying=and 230ppm, C arrive at a station=and 305ppm brings following formula respectively into,
m=(-T target falls in T0+T liter-T) × 0.02kg/t or
m=[(O arrive at a station-O alloying before+200) ÷ 133-C arrives at a station] × 0.0012kg/t
as calculated, under 200t molten steel amount, carburelant add-on is respectively 78kg and 51kg, and getting the little value of result is the add-on of carburelant, then the add-on of this carburelant is 51kg;
because the m value calculated is more than 20kg, therefore its point 3 property before 3 minutes are added; For the first time, second time add-on be 20kg, third time add-on be 11kg;
3) conveniently rear operation is carried out.
through statistics, when adding carburelant and carry out deoxidation in RH vacuum oven, there is not expulsion events; Before molten steel alloying, oxygen level dropped to 230ppm by should be about 510ppm in the past, compared and have dropped 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 DEG C than conventional tapping temperature;
2) in RH vacuum oven, add carburelant and carry out deoxidation: in stove, vacuum tightness is at 6KPa; Before starting to carry out vacuum treated 6 minutes, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4kg/ DEG C of meter; The add-on of carburelant is according to following formulae discovery: known: T0=1625 DEG C, T liter=17 DEG C, and T falls=35 DEG C, T target=1590 DEG C, and O arrives at a station=690ppm,
before O alloying=and 230ppm, C arrive at a station=and 300ppm brings following formula respectively into,
m=(-T target falls in T0+T liter-T) × 0.02kg/t or
m=[(O arrive at a station-O alloying before+200) ÷ 133-C arrives at a station] × 0.0012kg/t
as calculated, carburelant add-on is respectively 70kg and 47kg, and getting the little value of result is the add-on of carburelant, then the add-on of this carburelant is 47kg;
because the m value calculated is more than 20kg, therefore before 3 minutes, 3 property it are divided to add and be over; For the first time, second time add-on be 20kg, third time add-on be 7kg;
3) conveniently rear operation is carried out.
through statistics, when adding carburelant and carry out deoxidation in RH vacuum oven, there is not expulsion events; Before molten steel alloying, oxygen level dropped to 230ppm by should be about 490ppm in the past, compared and have dropped 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 DEG C than conventional tapping temperature;
2) in RH vacuum oven, add carburelant and carry out deoxidation: in stove, vacuum tightness is at 5KPa; Before starting to carry out vacuum treated 6 minutes, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4 DEG C/min of meters; The add-on of carburelant is according to following formulae discovery: known: T0=1620 DEG C, T liter=10 DEG C, and T falls=35 DEG C, T target=1590 DEG C, and O arrives at a station=580ppm,
before O alloying=and 230ppm, C arrive at a station=and 362ppm brings following formula respectively into,
m=(-T target falls in T0+T liter-T) × 0.02kg/t or
m=[(O arrive at a station-O alloying before+200) ÷ 133-C arrives at a station] × 0.0012kg/t
as calculated, carburelant add-on is respectively 20kg and 12kg, and getting the little value of result is the add-on of carburelant, then the add-on of this carburelant is 12kg;
because the m value calculated is less than 20kg, therefore its disposable adding before 1 minute, is over.
) conveniently carry out rear operation.
through statistics, when adding carburelant and carry out deoxidation in RH vacuum oven, there is not expulsion events; Before molten steel alloying, oxygen level dropped to 230ppm by should be about 300ppm in the past, compared and have dropped 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 DEG C than conventional tapping temperature;
2) in RH vacuum oven, add carburelant and carry out deoxidation: in stove, vacuum tightness is at 4KPa; Before starting to carry out vacuum treated 6 minutes, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 4 DEG C/min of meters; The add-on of carburelant is according to following formulae discovery: known: T0=1630 DEG C, T liter=27 DEG C, and T falls=35 DEG C, T target=1590 DEG C, and O arrives at a station=896ppm,
before O alloying=and 230ppm, C arrive at a station=and 234ppm brings following formula respectively into,
m=(-T target falls in T0+T liter-T) × 0.02kg/t or
m=[(O arrive at a station-O alloying before+200) ÷ 133-C arrives at a station] × 0.0012kg/t
as calculated, carburelant add-on is respectively 128kg and 100kg, and getting the little value of result is the add-on of carburelant, then the add-on of this carburelant is 100kg;
because the m value calculated is more than 20kg, therefore before 5 minutes, 5 property it are divided to add and be over; Each add-on is 20kg.
) conveniently carry out rear operation.
through statistics, when adding carburelant and carry out deoxidation in RH vacuum oven, there is not expulsion events; Before molten steel alloying, oxygen level dropped to 230ppm by should be about 780ppm in the past, compared and have dropped 70.5%; Aluminum shot unit consumption is 1.025Kg/ ton steel.
above-described embodiment is only the best and exemplifies, 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 DEG C than conventional tapping temperature;
2) in RH vacuum oven, add carburelant and carry out deoxidation: in control stove, vacuum tightness is at 4 ~ 6KPa; From starting to carry out in vacuum treated 6 minutes, the carburelant that will add all adds; Carburelant deoxidation temperature drop is according to 3 ~ 4kg/ DEG C of meter; The add-on of carburelant is according to following formulae discovery:
M=(T
0+ T
rise-T
fall-T
target) × 0.02kg/ ton steel or
M=[(O
arrive at a station-O
before alloying+ 200) ÷ 1.33-C
arrive at a station] × 0.0012kg/t
In formula: m-expression carburelant add-on, unit is: kg/ ton steel;
T
0the molten steel temperature when vacuum-treat of-expression RH stove starts, unit is: DEG C;
T
falltemperature drop number in-expression molten steel vacuum refining process, unit is: DEG C;
T
riseintensification number in-expression molten steel alloying process, unit is: DEG C;
T
targettemperature at the end of-expression molten steel target, unit is: DEG C;
O
arrive at a station-representing that molten steel is to oxygen level during RH stove, unit is: ppm;
O
before alloyingthe content of oxygen before-expression molten steel alloying, i.e. decarburization terminal oxygen level, unit is: ppm;
C
arrive at a station-representing that molten steel is to carbon content during RH stove, unit is: ppm;
It should be noted that, two formula are all calculated, and finally getting the little value of result is the add-on of carburelant;
When the m value calculated is not more than 20kg, then disposablely to add; When m value is more than 20kg, then take feed postition in batches, often criticize 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) conveniently rear operation is carried out.
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| 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 |
| CN106011385A (en) * | 2016-06-21 | 2016-10-12 | 首钢京唐钢铁联合有限责任公司 | Smelting method of 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 |
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