CN110343810A - A kind of method of liquid steel pre-deoxidizing in converter tapping process - Google Patents
A kind of method of liquid steel pre-deoxidizing in converter tapping process Download PDFInfo
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- CN110343810A CN110343810A CN201910599718.XA CN201910599718A CN110343810A CN 110343810 A CN110343810 A CN 110343810A CN 201910599718 A CN201910599718 A CN 201910599718A CN 110343810 A CN110343810 A CN 110343810A
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- steel
- deoxidation
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- tapping process
- deoxidizing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of methods of liquid steel pre-deoxidizing in converter tapping process, the described method comprises the following steps: (1) sampling, thermometric before converter tapping, and terminal ingredient is bessemerized in guarantee, temperature meets the requirement of steel grade technique；(2) pig iron is added in ladle and carries out pre-deoxidation according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process；(3) after pre-deoxidation, the control of terminal oxygen is in 400ppm hereinafter, FeMn, FeSi, Al deoxidiers, which are added, according to terminal oxygen content carries out final deoxidizing, alloying operation.The present invention carries out pre-deoxidation using pig iron before converter molten steel final deoxidizing, has not only reduced the generation quantity of terminal deoxidation products, but also purified molten steel, included heat itself can reduce tapping process temperature drop again；The additional amount that deoxidier can be reduced simultaneously, reduces cost；Easy to operate, effect stability provides technical support for converter molten steel deoxidation control, has broad application prospects.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of method of liquid steel pre-deoxidizing in converter tapping process.
Background technique
Deoxidization technique is an important ring for pneumatic steelmaking, it has direct shadow to steel inclusion form, quantity, type
It rings.
The deoxidation mode of pneumatic steelmaking is usually in tapping process, and the sequence to be grown from weak to strong according to deoxidizing capacity successively adds
Enter the deoxidiers such as manganese iron, ferrosilicon, aluminium and carries out deoxidation.There are two deficiencies for this technique: first is that having used under hyperoxia position opposite
More expensive manganese iron, Antaciron；Second is that burning, causing on molten steel surface in adition process since the density of aluminium is small, oxidisability is strong
W (O), w (Als) in steel be unstable and waste of aluminium, influences slab quality, and when w (Als) is greater than 0.003%, deoxidation
Product is solid Al2O3Field trash is difficult removal of cmpletely floating, may be because generating Al2O3It is mingled with and blocks the mouth of a river, it is right
The casting of molten steel and the end properties of steel have an adverse effect.
For the stringent limit aluminum steel kind of cord steel, aluminium deoxidation cannot be added, the deoxidations such as the Si-Ca-Ba of a large amount of valuableness need to be added
Manganese iron, ferrosilicon etc. are added after agent pre-deoxidation carries out deoxidation, higher cost.The units such as Ji steel in tapping the study found that make early period
It replaces part aluminium to carry out liquid steel pre-deoxidizing with cheap carbon dust, not only reduces the consumption of aluminum products, and deoxidation products
For CO, the noresidue in molten steel has achieved the purpose that not only to reduce production cost but also has improved product quality.But such method of deoxidation
There is main problem in actual application, to be that toner density is small be easy to float on molten steel surface, and is easy combustion during the addition process
It burns, causes deoxidation effectiveness stability poor.Carbon dust additional amount is insufficient, then carbon dust is because scaling loss causes deoxidation effect poor；Carbon dust is added
Amount is excessive, if the carbon dust being then added cannot be entirely used for deoxidation or be burnt, easily causes carbon content of molten steel offscale.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of methods of liquid steel pre-deoxidizing in converter tapping process.The invention
It is resource in system using steel plant's pneumatic steelmaking primary raw material as pre-deoxidant, does not increase production cost, operation letter additionally
Just, effect stability provides technical support for converter molten steel deoxidation control, has broad application prospects.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: molten steel is pre- de- in a kind of converter tapping process
The method of oxygen, the described method comprises the following steps:
(1) sampling, thermometric before converter tapping, terminal ingredient is bessemerized in guarantee, temperature meets the requirement of steel grade technique；
(2) 3.0~8.0kg/t is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
The pig iron of steel carries out pre-deoxidation；
(3) after pre-deoxidation, the control of terminal oxygen take off eventually hereinafter, deoxidier is added according to terminal oxygen content in 400ppm
Oxygen, alloying operation.
Step (1) of the present invention bessemerizes terminal C:0.01~0.05%, terminal O:600~1000ppm, terminal temperature
Degree is 1600~1660 DEG C.
3~8kg/t of pig iron steel pre-deoxidation is added in step (2) of the present invention.
Step (2) pig iron baking temperature of the present invention is 700~1100 DEG C.
The carbon content of step (2) pig iron of the present invention is 3~4%.
Deoxidier is any one or a few in FeMn, FeSi, Al in step (3) of the present invention.
The method of liquid steel pre-deoxidizing, process product detection method refer to YB/T in a kind of converter tapping process of the present invention
5296-2011。
The beneficial effects of adopting the technical scheme are that the 1, present invention utilizes life before converter molten steel final deoxidizing
Iron block carries out pre-deoxidation, has the effect of carbon dust pre-deoxidation and avoids the negative effects such as its scaling loss is serious, stability is poor, both dropped
The generation quantity of low terminal deoxidation products, and molten steel has been purified, the heat that included heat itself and deoxygenation are released is again
Tapping process temperature drop can be reduced；The additional amount that deoxidier can be reduced simultaneously, reduces cost.2, the present invention is turned using steel plant
Furnace makes steel primary raw material as pre-deoxidant, is resource in system, does not increase production cost additionally, easy to operate, effect stability,
Technical support is provided for converter molten steel deoxidation control, is had broad application prospects.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the mild steel that steel grade is Q195, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.04%, O:866ppm, outlet temperature are 1654 DEG C, meet the requirement of steel grade technique；
(2) life of 5.8kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 1100 DEG C, carbon content 3.5%；
(3) after pre-deoxidation molten steel balance oxygen concentration be 325ppm, then according to terminal oxygen content be added FeMn, FeSi, Al into
Row final deoxidizing, alloying operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 5.8kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 325ppm from 866ppm, and the amount for needing to be added deoxidier aluminum shot is 3.2kg/t
Steel, it is possible to reduce aluminum shot additional amount 2.6kg/t steel, aluminum shot price is calculated according to 10,000 yuan/ton then saves the comprehensive wound effect of cost of alloy
26 yuan/ton of steel.
Embodiment 2
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the medium carbon steel that steel grade is 40Cr, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.02%, O:726ppm, outlet temperature are 1638 DEG C, meet the requirement of steel grade technique；
(2) life of 5.0kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 700 DEG C, carbon content 3.3%；
(3) after pre-deoxidation molten steel balance oxygen concentration be 275ppm, then according to terminal oxygen content be added FeMn, FeSi, Al into
Row final deoxidizing, alloying operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 4.7kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 275ppm from 726ppm, and the amount for needing to be added deoxidier aluminum shot is 2.2kg/t
Steel, it is possible to reduce aluminum shot additional amount 2.5kg/t steel, aluminum shot price is calculated according to 10,000 yuan/ton then saves the comprehensive wound effect of cost of alloy
25 yuan/ton of steel.
Embodiment 3
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the high-carbon steel that steel grade is GCr15, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.03%, O:713ppm, outlet temperature are 1625 DEG C, meet the requirement of steel grade technique；
(2) life of 7.0kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 800 DEG C, carbon content 3.4%；
(3) after pre-deoxidation molten steel balance oxygen concentration be 195ppm, then according to terminal oxygen content be added FeMn, FeSi, Al into
Row final deoxidizing, alloying operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 4.5kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 195ppm from 713ppm, and the amount for needing to be added deoxidier aluminum shot is 2.1kg/t
Steel, it is possible to reduce aluminum shot additional amount 2.4kg/t steel, aluminum shot price is calculated according to 10,000 yuan/ton then saves the comprehensive wound effect of cost of alloy
24 yuan/ton of steel.
Embodiment 4
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the high-carbon steel that steel grade is U71Mn, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.03%, O:700ppm, outlet temperature are 1615 DEG C, meet the requirement of steel grade technique；
(2) life of 6.0kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 1000 DEG C, carbon content 3.2%；
(3) molten steel balance oxygen concentration is 260ppm after pre-deoxidation, and Al progress final deoxidizings then are added according to terminal oxygen content, close
Aurification operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 1.5kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 195ppm from 713ppm, then can cancel the addition of the deoxidier, aluminum shot price
It is calculated according to 10,000 yuan/ton and then saves cost of alloy 15 yuan/ton of steel of comprehensive wound effect.
Embodiment 5
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the high-carbon steel that steel grade is 65Mn, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.05%, O:635ppm, outlet temperature are 1636 DEG C, meet the requirement of steel grade technique；
(2) life of 4.0kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 890 DEG C, carbon content 3.71%；
(3) after pre-deoxidation molten steel balance oxygen concentration be 217ppm, then according to terminal oxygen content be added FeMn progress final deoxidizings,
Alloying operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 4.1kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 217ppm from 635ppm, and the amount for needing to be added deoxidier aluminum shot is 2.3kg/t
Steel, it is possible to reduce aluminum shot additional amount 1.8kg/t steel, aluminum shot price is calculated according to 10,000 yuan/ton then saves the comprehensive wound effect of cost of alloy
18 yuan/ton of steel.
Embodiment 6
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the high-carbon steel that steel grade is U75V, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.01%, O:600ppm, outlet temperature are 1660 DEG C, meet the requirement of steel grade technique；
(2) life of 3.0kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 810 DEG C, carbon content 4.0%；
(3) molten steel balance oxygen concentration is 182ppm after pre-deoxidation, and it is de- eventually that FeMn, Al progress then are added according to terminal oxygen content
Oxygen, alloying operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 1.2kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 182ppm from 600ppm, then can cancel the addition of the deoxidier, aluminum shot price
It is calculated according to 10,000 yuan/ton and then saves cost of alloy 12 yuan/ton of steel of comprehensive wound effect.
Embodiment 7
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the medium carbon steel that steel grade is Q345R, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.035%, O:1000ppm, outlet temperature are 1600 DEG C, meet the requirement of steel grade technique；
(2) life of 8.0kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 1050 DEG C, carbon content 3.2%；
(3) molten steel balance oxygen concentration is 400ppm after pre-deoxidation, and FeMn, FeSi progress then are added eventually according to terminal oxygen content
Deoxidation, alloying operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 6.4kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 400ppm from 1000ppm, and the amount for needing to be added deoxidier aluminum shot is 3.8kg/t
Steel, it is possible to reduce aluminum shot additional amount 2.6kg/t steel, aluminum shot price is calculated according to 10,000 yuan/ton then saves the comprehensive wound effect of cost of alloy
26 yuan/ton of steel.
Embodiment 8
The method of liquid steel pre-deoxidizing in a kind of converter tapping process of the present embodiment smelts the medium carbon steel that steel grade is 37Mn5, pre- de-
Oxygen method the following steps are included:
(1) converter smelting endpoint: C:0.043%, O:920ppm, outlet temperature are 1625 DEG C, meet the requirement of steel grade technique；
(2) life of 4.5kg/t steel is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
Iron block carries out pre-deoxidation；Pig iron baking temperature is 990 DEG C, carbon content 3.52%；
(3) molten steel balance oxygen concentration is 153ppm after pre-deoxidation, and it is de- eventually that FeSi, Al progress then are added according to terminal oxygen content
Oxygen, alloying operation.
If not using the direct adduction gold deoxidation of this technique, the amount for needing to be added deoxidier aluminum shot is 5.7kg/t steel, passes through life
Iron block pre-deoxidation, the oxygen content in molten steel are down to 153ppm from 920ppm, and the amount for needing to be added deoxidier aluminum shot is 1.0kg/t
Steel, it is possible to reduce aluminum shot additional amount 4.7kg/t steel, aluminum shot price is calculated according to 10,000 yuan/ton then saves the comprehensive wound effect of cost of alloy
47 yuan/ton of steel.
Above-described embodiment shows can be under non-vacuum condition, in converter tapping process, according to steel grade and converter terminal
A certain amount of pig iron is added in oxygen content in tapping process, promotes the oxygen in molten steel that reaction between carbon and oxygen, product occur in ladle
For gaseous state CO discharge.Because molten iron is liquid, it can be sufficiently mixed and react with molten steel, both achieve the purpose that deoxidation, it can also be with
Carburetting is considered whether according to steel grade and actual conditions or only removes excess oxygen, and control is flexibly and the CO gas of generation not only will not
Molten steel is polluted, and may advantageously facilitate the effect for being mingled with floating and denitrogenation, purification molten steel improves steel quality, and cost is relatively using normal
Rule alloy and other deoxidiers are substantially reduced.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (6)
1. a kind of method of liquid steel pre-deoxidizing in converter tapping process, which is characterized in that the described method comprises the following steps:
(1) sampling, thermometric before converter tapping, terminal ingredient is bessemerized in guarantee, temperature meets the requirement of steel grade technique；
(2) 3.0~8.0kg/t is added in ladle according to the requirement of steel grade endpoint carbon content of converter is smelted in converter tapping process
The pig iron of steel carries out pre-deoxidation；
(3) after pre-deoxidation, the control of terminal oxygen take off eventually hereinafter, deoxidier is added according to terminal oxygen content in 400ppm
Oxygen, alloying operation.
2. the method for liquid steel pre-deoxidizing in a kind of converter tapping process according to claim 1, which is characterized in that the step
Suddenly (1) bessemerizes terminal C:0.01~0.05%, terminal O:600~1000ppm, and outlet temperature is 1600~1660 DEG C.
3. the method for liquid steel pre-deoxidizing in a kind of converter tapping process according to claim 1, which is characterized in that the step
Suddenly 3~8kg/t of pig iron steel pre-deoxidation is added in (2).
4. the method for liquid steel pre-deoxidizing, feature in a kind of converter tapping process according to claim 1 to 3
It is, step (2) the pig iron baking temperature is 700~1100 DEG C.
5. the method for liquid steel pre-deoxidizing, feature in a kind of converter tapping process according to claim 1 to 3
It is, the iron block that step (2) the pig iron carbon content is 3~4%.
6. the method for liquid steel pre-deoxidizing, feature in a kind of converter tapping process according to claim 1 to 3
It is, deoxidier is any one or a few in FeMn, FeSi, Al in the step (3).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111876669A (en) * | 2020-06-29 | 2020-11-03 | 阳春新钢铁有限责任公司 | Control method of process for smelting low-carbon steel by converter |
| CN113637822A (en) * | 2021-07-28 | 2021-11-12 | 河北荣信钢铁有限公司 | Molten steel alloying method |
| CN115404309A (en) * | 2022-07-21 | 2022-11-29 | 首钢京唐钢铁联合有限责任公司 | Molten steel deoxidation method |
| CN115418430A (en) * | 2022-07-17 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for duplex smelting of steel ladle cold steel |
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| CN111876669A (en) * | 2020-06-29 | 2020-11-03 | 阳春新钢铁有限责任公司 | Control method of process for smelting low-carbon steel by converter |
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| CN115418430A (en) * | 2022-07-17 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for duplex smelting of steel ladle cold steel |
| CN115418430B (en) * | 2022-07-17 | 2023-07-28 | 新疆八一钢铁股份有限公司 | Operation method for duplex smelting ladle cold steel |
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| CN115404309B (en) * | 2022-07-21 | 2023-12-22 | 首钢京唐钢铁联合有限责任公司 | Molten steel deoxidizing method |
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Application publication date: 20191018 |