CN105400928A - Ultra-low carbon steel two-step deoxygenation method - Google Patents
Ultra-low carbon steel two-step deoxygenation method Download PDFInfo
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- CN105400928A CN105400928A CN201510779069.3A CN201510779069A CN105400928A CN 105400928 A CN105400928 A CN 105400928A CN 201510779069 A CN201510779069 A CN 201510779069A CN 105400928 A CN105400928 A CN 105400928A
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Abstract
The invention provides an ultra-low carbon steel two-step deoxygenation method and belongs to the field of steel making. The ultra-low carbon steel two-step deoxygenation method aims to reduce the temperature loss when a converter discharges steel and to reduce the process cost. The method comprises the following steps that (1), molten steel is obtained through smelting in the converter; (2), steel is discharged, the molten steel in the converter enters a steel ladle, and at the same time, deoxidizing agents are added into the steel ladle to partially deoxidize the molten steel; and (3), the steel ladle enters a vacuum environment to be subjected to deoxidization and alloying. The ultra-low carbon steel two-step deoxygenation method reduces the temperature loss when the converter discharges the steel, the molten steel heating process is omitted, the molten steel can be directly subjected to vacuum treatment, and the smelting cost of the ultra-low carbon steel is reduced really and is reduced to 44.5 yuan/ton from 54.5 yuan/ton.
Description
Technical field
The present invention relates to field of steel-making, particularly a kind of ultra low-carbon steel two step deoxidation method.
Background technology
The processing route that current smelting suprelow carbon steel adopts is: desulfurization (TF) ~ converter (LD) ~ ladle refining (LF) ~ vacuum circulation degassing (RH) ~ continuous casting (CC).This technique does not carry out deoxidation alloying in converter, molten steel from converter out post-heating carry out temperature raising, then arrive vacuum environment and carry out decarburization deoxidation alloying.This kind of technique molten steel is 1640 ~ 1665 DEG C from temperature during converter tapping, tapping temperature loss after, tapping after temperature liquid steel temperature be 1520 ~ 1560 DEG C, and carry out under vacuum environment decarburization deoxidation alloying be need liquid steel temperature meet 1610 ~ 1620 DEG C.Therefore, decarburization deoxidation alloying needs to be carried out under vacuum conditions and before entering vacuum environment, heat temperature raising is carried out to molten steel, and equipment investment and energy consumption are needed to molten steel heat temperature raising, thus cause process costs to rise.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of ultra low-carbon steel two step deoxidation method, temperature loss during to reduce converter tapping, reduces process costs.
The technical solution used in the present invention is: a kind of ultra low-carbon steel two step deoxidation method, comprises the following steps:
(1) molten steel is obtained at converter smelting;
(2) tap, make the molten steel in converter enter ladle; Meanwhile, in ladle, add reductor and part deoxidation is carried out to molten steel;
(3) ladle carries out deoxidation alloying under entering vacuum environment.
Further, in step (2), tapping temperature is 1680 ~ 1700 DEG C.
Further, in step (2), reductor is ferroaluminium.
Further, the add-on of described ferroaluminium is greater than or equal to 0.5 kg/ton molten steel and is less than or equal to 1.5 kg/ton molten steel, ensures that oxygen activity is 400 ~ 500ppm.
Further, between step (2) and step (3), measure liquid steel temperature and oxygen activity, in molten steel, add aluminum steel according to oxygen activity measuring result and carry out oxygen activity fine setting, ensure that oxygen activity is 400 ~ 500ppm.
The invention has the beneficial effects as follows: the mode of part deoxidation when this kind of ultra low-carbon steel two step deoxidation method is tapped by adopting, reduce Tapping Temperature of Bof loss, and coordinate the raising of Tapping Temperature of Bof, avoid the process to molten steel heat temperature raising, molten steel is enable directly to enter vacuum-treat, the smelting cost of real reduction ultra low-carbon steel, makes smelting cost be reduced to 44.5 yuan/ton by 54.5 yuan/ton.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
A kind of ultra low-carbon steel two step deoxidation method, comprises the following steps:
(1) molten steel is obtained at converter smelting;
(2) tap, make the molten steel in converter enter ladle; Meanwhile, in ladle, add reductor and part deoxidation is carried out to molten steel;
(3) ladle carries out deoxidation alloying under entering vacuum environment.
Obtaining molten steel at converter smelting in step (1) is prior art.Making the molten steel in converter enter ladle in step (2) is also prior art, and before tapping, in converter, liquid steel temperature is very high; usually 1640 ~ 1665 DEG C can be reached; when molten steel in converter enters ladle, liquid steel temperature can reduce suddenly, and temperature loss is large.In order to reduce temperature loss, therefore, while tapping, in ladle, add reductor and part deoxidation is carried out to molten steel.Temperature loss when very heat makes up tapping in deoxidation process.In this step, deoxidation is part deoxidation, and namely after deoxidation, oxygen content in steel does not reach the requirement of refined ultra low-carbon steel.Carry out deoxygenated alloy under ladle enters vacuum environment in step (3) and turn to prior art, be now complete deoxidation, namely after deoxidation, oxygen content in steel reaches the requirement of refined soft steel.
Owing to carrying out part deoxidation to molten steel in tapping process, the heat produced compensate for the temperature loss of tapping process, therefore, after tapping, without the need to carrying out heat temperature raising to molten steel, carry out deoxidation alloying under directly entering vacuum environment, avoid the equipment investment of heat temperature raising and the energy consumption of heat temperature raising, reduce process costs.
Further, in step (2), tapping temperature is 1680 ~ 1700 DEG C.
When the condition of tapping is identical, tapping temperature is higher, temperature after tapping is higher, and to carry out deoxidation alloying requirement liquid steel temperature to molten steel under vacuum environment be 1610 ~ 1620 DEG C, when after tapping, liquid steel temperature is unfavorable for carrying out deoxidation alloying under vacuum environment lower than 1610 ~ 1620 DEG C.And in prior art, tapping temperature is 1640 ~ 1665 DEG C, after temperature loss, after tapping, temperature is easily lower than 1610 ~ 1620 DEG C, once lower than 1610 ~ 1620 DEG C, just needs to carry out heat temperature raising to molten steel.Therefore, as preferably, in step (2), tapping temperature is 1680 ~ 1700 DEG C.Improve tapping temperature, thus liquid steel temperature after improving tapping.
Further, in step (2), reductor is ferroaluminium.
Reductor can be calsibar alloy, also can be ferroaluminium.But ferroaluminium is kind of a NEW TYPE OF COMPOSITE deoxidation material, its carbon content low (being less than or equal to 1.0%), density large (5.1 ~ 5.6g/cm3) is easy to penetrate molten steel slag blanket, can reach molten steel deep layer and dissolve deoxidation.As preferably, reductor is ferroaluminium.The composition of ferroaluminium is mainly: AL:40 ~ 45%, Si :≤2.0%, Cu :≤0.05%, P :≤0.05%, S :≤0.05%, C :≤1% and iron.
Further, the add-on of described ferroaluminium is greater than or equal to 0.5 kg/ton molten steel and is less than or equal to 1.5 kg/ton molten steel, ensures that oxygen activity is 400 ~ 500ppm.
Molten steel oxygen activity is the important symbol of smelting, building normalizing degree, and the whether suitable of its control is contacted directly with steel surface quality and inner quality.And adding after ferroaluminium carries out part deoxidation to molten steel, steel oxygen content in water reduces, and the add-on of ferroaluminium is to ensure that oxygen activity is that 400 ~ 500ppm is as the criterion, and when the add-on of ferroaluminium is greater than or equal to 0.5 kg/ton molten steel and is less than or equal to 1.5 kg/ton molten steel, just can ensure that oxygen activity is 400 ~ 500ppm.
Further, between step (2) and step (3), measure liquid steel temperature and oxygen activity, in molten steel, add aluminum steel according to oxygen activity measuring result and carry out oxygen activity fine setting, ensure that oxygen activity is 400 ~ 500ppm.
After adding ferroaluminium deoxidation, due to the impact of the other factorses such as temperature, oxygen activity accurately can not ensure 400 ~ 500ppm, therefore, adds aluminum steel and carry out oxygen activity fine setting in molten steel, ensures that oxygen activity is 500ppm.Aluminum steel is the linear material be made up of fine aluminium or aluminium alloy.
Embodiment 1: when molten steel tapping temperature is 1680 DEG C, during tapping, after adding the deoxidation of ferroaluminium part by 0.5 kg/ton molten steel, oxygen activity is 400 ~ 500ppm, and after tapping, liquid steel temperature is 1621 DEG C, temperature loss 59 DEG C;
Embodiment 2: when molten steel tapping temperature is 1690 DEG C, during tapping, after adding the deoxidation of ferroaluminium part by 1 kg/ton molten steel, oxygen activity is 400 ~ 500ppm, and after tapping, liquid steel temperature is 1647 DEG C, temperature loss 43 DEG C;
Embodiment 3: when molten steel tapping temperature is 1700 DEG C, during tapping, after adding the deoxidation of ferroaluminium part by 1.5 kg/ton molten steel, oxygen activity is 400 ~ 500ppm, and after tapping, liquid steel temperature is 1660 DEG C, temperature loss 60 DEG C;
As can be seen from embodiment 1 ~ 3, when molten steel tapping temperature is 1680 ~ 1700 DEG C, add ferroaluminium 0.5 ~ 1.5 kg/ton molten steel, after part deoxidation, liquid steel temperature is 1621 ~ 1660 DEG C, and temperature loss is 40 ~ 59 DEG C.And when molten steel tapping temperature is 1640 ~ 1665 DEG C, during tapping, not adding the deoxidation of ferroaluminium part, after tapping, liquid steel temperature is 1520 ~ 1560 DEG C.Therefore, add the deoxidation of ferroaluminium part during tapping and do not add compared with the deoxidation of ferroaluminium part, temperature loss is little.
The mode of part deoxidation when this kind of ultra low-carbon steel two step deoxidation method is tapped by adopting, reduce Tapping Temperature of Bof loss, and coordinate the raising of Tapping Temperature of Bof, avoid the process to molten steel heat temperature raising, molten steel is enable directly to enter vacuum-treat, the smelting cost of real reduction ultra low-carbon steel, makes smelting cost be reduced to 44.5 yuan/ton by 54.5 yuan/ton.
Claims (5)
1. a ultra low-carbon steel two step deoxidation method, is characterized in that: comprise the following steps:
(1) molten steel is obtained at converter smelting;
(2) tap, make the molten steel in converter enter ladle; Meanwhile, in ladle, add reductor and part deoxidation is carried out to molten steel;
(3) ladle carries out deoxidation alloying under entering vacuum environment.
2. a kind of ultra low-carbon steel two step deoxidation method as claimed in claim 1, it is characterized in that: in step (2), tapping temperature is 1680 ~ 1700 DEG C.
3. a kind of ultra low-carbon steel two step deoxidation method as claimed in claim 1 or 2, it is characterized in that: in step (2), reductor is ferroaluminium.
4. a kind of ultra low-carbon steel two step deoxidation method as claimed in claim 3, is characterized in that: the add-on of described ferroaluminium is greater than or equal to 0.5 kg/ton molten steel and is less than or equal to 1.5 kg/ton molten steel, ensures that oxygen activity is 400 ~ 500ppm.
5. a kind of ultra low-carbon steel two step deoxidation method as claimed in claim 4, it is characterized in that: between step (2) and step (3), measure liquid steel temperature and oxygen activity, in molten steel, add aluminum steel according to oxygen activity measuring result and carry out oxygen activity fine setting, ensure that oxygen activity is 400 ~ 500ppm.
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| CN201510779069.3A CN105400928A (en) | 2015-11-13 | 2015-11-13 | Ultra-low carbon steel two-step deoxygenation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106929633A (en) * | 2017-04-06 | 2017-07-07 | 攀钢集团西昌钢钒有限公司 | A kind of smelting process of ultra-low-carbon steel |
| CN107779549A (en) * | 2016-08-31 | 2018-03-09 | 河南凤宝特钢有限公司 | A kind of steelmaking converter deoxidization technique |
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| CN103627853A (en) * | 2013-12-05 | 2014-03-12 | 广东韶钢松山股份有限公司 | Method for manufacturing low-carbon and low-silicon steel |
| CN103911487A (en) * | 2012-12-31 | 2014-07-09 | 攀钢集团攀枝花钢钒有限公司 | Method for smelting of ultra-low carbon steel and continuous casting method for ultra-low carbon steel |
| CN104232831A (en) * | 2014-09-02 | 2014-12-24 | 南京钢铁股份有限公司 | Low-carbon ultra-low sulfur steel smelting method |
| CN104928558A (en) * | 2015-07-02 | 2015-09-23 | 首钢总公司 | Low-carbon steel for deep drawing and smelting method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103911487A (en) * | 2012-12-31 | 2014-07-09 | 攀钢集团攀枝花钢钒有限公司 | Method for smelting of ultra-low carbon steel and continuous casting method for ultra-low carbon steel |
| CN103627853A (en) * | 2013-12-05 | 2014-03-12 | 广东韶钢松山股份有限公司 | Method for manufacturing low-carbon and low-silicon steel |
| CN104232831A (en) * | 2014-09-02 | 2014-12-24 | 南京钢铁股份有限公司 | Low-carbon ultra-low sulfur steel smelting method |
| CN104928558A (en) * | 2015-07-02 | 2015-09-23 | 首钢总公司 | Low-carbon steel for deep drawing and smelting method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107779549A (en) * | 2016-08-31 | 2018-03-09 | 河南凤宝特钢有限公司 | A kind of steelmaking converter deoxidization technique |
| CN106929633A (en) * | 2017-04-06 | 2017-07-07 | 攀钢集团西昌钢钒有限公司 | A kind of smelting process of ultra-low-carbon steel |
| CN106929633B (en) * | 2017-04-06 | 2019-01-04 | 攀钢集团西昌钢钒有限公司 | A kind of smelting process of ultra-low-carbon steel |
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Application publication date: 20160316 |