CN102864275A - Control method of aluminum content of heavy rail steel - Google Patents
Control method of aluminum content of heavy rail steel Download PDFInfo
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- CN102864275A CN102864275A CN2012103579642A CN201210357964A CN102864275A CN 102864275 A CN102864275 A CN 102864275A CN 2012103579642 A CN2012103579642 A CN 2012103579642A CN 201210357964 A CN201210357964 A CN 201210357964A CN 102864275 A CN102864275 A CN 102864275A
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Abstract
The invention provides a control method of aluminum content of heavy rail steel. Carbon content of tapping steel of a converter is controlled, and an carburetant is added in a tapping process; manganese and silicon ingredient adjustment is carried out by using manganese-silicon alloy, and deoxidier-2-3.5kg/ton of steel is added; active lime and bauxite are added in an LF (ladle furnace), an iron sheet ball is added in slag after top slag is completely melted; manganese alloy content fine tuning is carried out by using the manganese-silicon alloy, and the carbon content is adjusted to be 0.68-0.75wt%; and temperature is raised to 1570-1585 DEG C, a liquid steel tank is moved into a vacuum degassing (VD) furnace from the LF to conduct vacuum treatment, pouring is carried out on a continuous casting machine, and a tundish water feeding port is closed to conduct argon blowing in a pouring process. With the adoption of the control method, adding quantity of high price alloy can be substantially reduced, the aluminum content in steel in the LF is prevented from increasing and mass production is achieved under a condition that the aluminum content in the steel is lower than 0.004%; and average aluminum content can achieve lower than 0.0026%, and a melting rate of the heavy rail steel is 0.033%.
Description
Technical field
The invention belongs to the smelting technology technical field, particularly the method for control aluminium content in a kind of Properties of Heavy Rail Steel By production process.
Background technology
Properties of Heavy Rail Steel By is had relatively high expectations to aluminium content, and in TBT3276-2011 " rail for high-speed railway " industry standard, the aluminium content of requirement is lower than 0.004%.Because alloy and slag charge that Properties of Heavy Rail Steel By adds very easily make steel grade aluminium content overproof, the difficulty of therefore not only controlling aluminium increases, and easily causes steel grades defective and change the problem of steel grade, thereby has greatly reduced the rate that is smelt of product.
Summary of the invention
The present invention aims to provide a kind of method of controlling Properties of Heavy Rail Steel By aluminium content,, reduces and changes the steel accident in the situation that the common alloy of use is smelted the Properties of Heavy Rail Steel By that to satisfy the aluminium content requirement to realize, improves the rate that is smelt of Properties of Heavy Rail Steel By.
For reaching this purpose, the present invention has taked following solution:
A kind of control method of Properties of Heavy Rail Steel By aluminium content, its concrete grammar is:
1, the operational path that adopts is: alloy adjustment-ladle refining furnace is that LF stove alloy fine setting-vacuum degassing furnace is VD stove vacuum outgas-continuous casting casting behind converter smelting-Converter;
2, the converter tapping carbon content control is at 0.20-0.40wt%, and the ratio in steel 3-4kg per ton in the tapping process adds carburelant;
3, after the tapping, liquid steel temperature is controlled at 1585-1600 ℃; Adopt manganese-silicon to carry out manganese, the adjustment of silicon composition, the manganese-silicon add-on is only according to the requirement of steel grade manganese target component; And add reductor according to the ratio of steel 2-3.5kg per ton;
4, ladle adds quickened lime and bauxitic clay slag making materials after being transported to the LF stove, and quickened lime and bauxitic clay add-on are according to CaO/Al
2O
3The ratio of=4-5 is controlled;
5, reach temperature requirement when the LF stove heats up, and the top slag is all after the fusing, adds in the slag and contain FeO 〉=60 wt %, Al
2O
3≤ 1.0 wt %, TiO
2The iron sheet ball of≤0.80 wt %, iron sheet ball add-on is by adding FeO cubage in the CaO content and iron sheet ball in the quickened lime early stage, and its weight ratio is CaO/ FeO=4-6;
6, adopt manganese-silicon to carry out the fine setting of manganese alloy content, it is wherein a kind of of SiFe75Al1.0-A, SiFe75Al1.0-B, SiFe75Al0.5-A, SiFe75Al0.5-B that the ferrosilicon trade mark is adopted in the silicone content adjustment, and composition satisfies GB2272-2009; Add carburelant and Argon and stir, carbon content is adjusted to 0.68-0.75wt%;
7, continue to be warming up to 1570-1585 ℃, ladle moved into the VD stove from the LF stove, carry out vacuum-treat after, the tundish upper nozzle Argon is closed in the cast of upper continuous caster in the casting process.
Described deoxidant ingredient and weight percent content are: Si 49-60%, and Ca 1-3%, Ba 16-25%, Al≤0.6%, C≤0.4%, S≤0.04%, P≤0.04%, remaining is Fe and trace impurity.
CaO content is 88-90wt% in the described quickened lime, and granularity is 2-10mm.
Al in the described bauxitic clay
2O
3Content is 80-85 wt%, and granularity is 1-10mm.
Positively effect of the present invention is:
The present invention by behind Converter and the rational alloy of LF stove choose, make common alloy just can satisfy the requirement of Properties of Heavy Rail Steel By, and steel per ton at high price the add-on of alloy can reduce 17-18kg.Simultaneously, the LF stove can prevent the increase of aluminium content in the LF stove steel by the effective control to top slag deoxidation degree, realizes that aluminium content is lower than 0.004% large-scale production in the steel, and average aluminium content can reach below 0.0026%; Because the aluminium content overproof affect Properties of Heavy Rail Steel By and is smelt rate and is reduced to 0.033% by original 0.087%, thereby greatly minimizing changes the financial loss that steel causes.
Embodiment
Below, take 100 tons of converters, 100 tons of ladles, 100 tons of LF stoves and 100 tons of VD stoves as example, the invention will be further described.
Embodiment 1:
Steel grade U71Mn, its chemical composition mass percent is:
C?0.62-0.80%，Si?0.15-0.58%，Mn0.70-1.20%，P≤0.030%，S≤0.025%，Cr≤0.15%，V≤0.03%，Al≤0.004%。
1, the operational path that adopts is: alloy adjustment behind converter smelting-Converter-LF stove alloy fine setting-VD stove vacuum outgas-continuous casting casting.
2, add the 300kg carburelant in the converter tapping process, the tapping carbon content control is at 0.035wt%.
3, after the tapping, liquid steel temperature is controlled at 1585 ℃; Adopting the trade mark is that the FeMn68Si18 manganese-silicon carries out manganese, the adjustment of silicon composition; Then add the 350kg reductor, manganese content in the steel is adjusted into 1.12 wt%, this moment, silicone content was 0.31 wt%.
4, after ladle is transported to the LF stove, enter 1545 ℃ of LF stove liquid steel temperatures, press CaO/Al
2O
3=4 ratio adds quickened lime and bauxitic clay slag making materials, and wherein CaO content is 88wt% in the quickened lime, and granularity is 4mm; Al in the bauxitic clay
2O
3Content is 84.5 wt%, and granularity is 9mm.Then be warmed up to 1585 ℃.
5, be warmed up to 1585 ℃ when the LF stove, Argon is stirred to the top slag all after the fusing, adds in the slag and contains FeO65 wt %, Al
2O
30.63wt %, TiO
20.80 the iron sheet ball of wt %, iron sheet ball add-on is by adding FeO cubage in the CaO content and iron sheet ball in the quickened lime early stage, and its weight ratio is CaO/ FeO=4.5.
6, adopt manganese-silicon to carry out the fine setting of manganese alloy content, it is SiFe75Al1.0-B that the ferrosilicon trade mark is adopted in the silicone content adjustment, and composition satisfies GB2272-2009; Add carburelant and Argon and stir, carbon content is adjusted to 0.68wt%.
7, continue to be warming up to 1580 ℃, ladle moved into the VD stove from the LF stove, carry out vacuum-treat after, take out of continuous caster cast, close the tundish upper nozzle Argon in the casting process.
Embodiment 2:
Steel grade U75V, its chemical composition mass percent is:
C?0.71-0.80%，Si?0.50-0.70%，Mn0.75-1.05%，P≤0.030%，S≤0.025%，Cr≤0.15%，V0.04-0.12%，Al≤0.004%。
1, the operational path that adopts is: alloy adjustment behind converter smelting-Converter-LF stove alloy fine setting-VD stove vacuum outgas-continuous casting casting.
2, add the 400kg carburelant in the converter tapping process, the tapping carbon content control is at 0.022wt%.
3, after the tapping, liquid steel temperature is controlled at 1600 ℃; Adopting the trade mark is that the FeMn67Si23 manganese-silicon carries out manganese, the adjustment of silicon composition; Then add the 200kg reductor, manganese content in the steel is adjusted into 0.88 wt%, this moment, silicone content was 0.33 wt%.
4, after ladle is transported to the LF stove, enter 1552 ℃ of LF stove liquid steel temperatures, press CaO/Al
2O
3=5 ratio adds quickened lime and bauxitic clay slag making materials, and wherein CaO content is 90wt% in the quickened lime, and granularity is 9mm; Al in the bauxitic clay
2O
3Content is 81 wt%, and granularity is 5mm.
5, be warmed up to 1585 ℃ when the LF stove, Argon is stirred to the top slag all after the fusing, adds in the slag and contains FeO60.5wt %, Al
2O
30.96wt %, TiO
20.66 the iron sheet ball of wt %, iron sheet ball add-on is by adding FeO cubage in the CaO content and iron sheet ball in the quickened lime early stage, and its weight ratio is CaO/ FeO=6.
6, adopt manganese-silicon to carry out the fine setting of manganese alloy content, it is SiFe75Al0.5-B that the ferrosilicon trade mark is adopted in the silicone content adjustment, and composition satisfies GB2272-2009; Add carburelant and Argon and stir, carbon content is adjusted to 0.50wt%.
7, continue to be warming up to 1575 ℃, ladle moved into the VD stove from the LF stove, carry out vacuum-treat after, take out of continuous caster cast, close the tundish upper nozzle Argon in the casting process.
Claims (4)
1. the control method of a Properties of Heavy Rail Steel By aluminium content is characterized in that, concrete grammar is:
(1), the operational path that adopts is: alloy adjustment-ladle refining furnace is that LF stove alloy fine setting-vacuum degassing furnace is VD stove vacuum outgas-continuous casting casting behind converter smelting-Converter;
(2), the converter tapping carbon content control is at 0.20-0.40wt%, the ratio in steel 3-4kg per ton in the tapping process adds carburelant;
(3), the tapping after, liquid steel temperature is controlled at 1585-1600 ℃; Adopt manganese-silicon to carry out manganese, the adjustment of silicon composition, the manganese-silicon add-on is only according to the requirement of steel grade manganese target component; And add reductor according to the ratio of steel 2-3.5kg per ton;
(4), ladle is transported to and adds quickened lime and bauxitic clay slag making materials behind the LF stove, quickened lime and bauxitic clay add-on are according to CaO/Al
2O
3The ratio of=4-5 is controlled;
(5), reach temperature requirement when the LF stove heats up, and the top slag is all after the fusing, adds in the slag and contains FeO 〉=60 wt %, Al
2O
3≤ 1.0 wt %, TiO
2The iron sheet ball of≤0.80 wt %, iron sheet ball add-on is by adding FeO cubage in the CaO content and iron sheet ball in the quickened lime early stage, and its weight ratio is CaO/ FeO=4-6;
(6), adopt manganese-silicon to carry out the fine setting of manganese alloy content, it is wherein a kind of of SiFe75Al1.0-A, SiFe75Al1.0-B, SiFe75Al0.5-A, SiFe75Al0.5-B that the ferrosilicon trade mark is adopted in the silicone content adjustment, composition satisfies GB2272-2009; Add carburelant and Argon and stir, carbon content is adjusted to 0.68-0.75wt%;
(7), continue to be warming up to 1570-1585 ℃, ladle is moved into the VD stove from the LF stove, carry out vacuum-treat after, the tundish upper nozzle Argon is closed in the cast of upper continuous caster in the casting process.
2. the control method of Properties of Heavy Rail Steel By aluminium content according to claim 1 is characterized in that, described deoxidant ingredient and weight percent content are: Si 49-60%, Ca 1-3%, Ba 16-25%, Al≤0.6%, C≤0.4%, S≤0.04%, P≤0.04%, remaining is Fe and trace impurity.
3. the control method of Properties of Heavy Rail Steel By aluminium content according to claim 1 is characterized in that, CaO content is 88-90wt% in the described quickened lime, and granularity is 2-10mm.
4. the control method of Properties of Heavy Rail Steel By aluminium content according to claim 1 is characterized in that, Al in the described bauxitic clay
2O
3Content is 80-85 wt%, and granularity is 1-10mm.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146882A (en) * | 2013-03-23 | 2013-06-12 | 鞍钢股份有限公司 | Method for controlling class B inclusions of steel rail for high-speed railway |
| CN103602785A (en) * | 2013-11-29 | 2014-02-26 | 武汉钢铁(集团)公司 | Economical efficient aluminum-free deoxidation method for high-speed heavy-rail steel |
| CN104975130A (en) * | 2015-07-20 | 2015-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling purity of heavy rail steel |
| CN104975136A (en) * | 2015-07-20 | 2015-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Control method for inclusions in heavy rail steel |
| CN105063267A (en) * | 2015-08-24 | 2015-11-18 | 武汉钢铁(集团)公司 | Production method for high-strength alloy R320Cr steel rails |
| CN111254248A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Method for controlling total aluminum of heavy rail steel U75V |
| CN111876558A (en) * | 2020-07-21 | 2020-11-03 | 安阳钢铁股份有限公司 | Method for producing peritectic high-strength steel based on LF + VD process and accurately controlling carbon content |
| CN114807717A (en) * | 2022-04-25 | 2022-07-29 | 武汉钢铁有限公司 | Low-cost silicon-aluminum-calcium-carbon alloy, preparation method thereof and application thereof in converter metallurgy heat supplement |
| WO2023093112A1 (en) * | 2021-11-29 | 2023-06-01 | 东北大学 | Smelting and continuous casting method for high-cr-si alloyed hot-formed steel |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103146882A (en) * | 2013-03-23 | 2013-06-12 | 鞍钢股份有限公司 | Method for controlling class B inclusions of steel rail for high-speed railway |
| CN103602785A (en) * | 2013-11-29 | 2014-02-26 | 武汉钢铁(集团)公司 | Economical efficient aluminum-free deoxidation method for high-speed heavy-rail steel |
| CN103602785B (en) * | 2013-11-29 | 2015-07-29 | 武汉钢铁(集团)公司 | A kind of high speed heavy rail steel al-free deoxidation method of economical and efficient |
| CN104975130A (en) * | 2015-07-20 | 2015-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling purity of heavy rail steel |
| CN104975136A (en) * | 2015-07-20 | 2015-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Control method for inclusions in heavy rail steel |
| CN105063267A (en) * | 2015-08-24 | 2015-11-18 | 武汉钢铁(集团)公司 | Production method for high-strength alloy R320Cr steel rails |
| CN111254248A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Method for controlling total aluminum of heavy rail steel U75V |
| CN111254248B (en) * | 2020-01-21 | 2021-12-24 | 鞍钢股份有限公司 | Method for controlling total aluminum of heavy rail steel U75V |
| CN111876558A (en) * | 2020-07-21 | 2020-11-03 | 安阳钢铁股份有限公司 | Method for producing peritectic high-strength steel based on LF + VD process and accurately controlling carbon content |
| WO2023093112A1 (en) * | 2021-11-29 | 2023-06-01 | 东北大学 | Smelting and continuous casting method for high-cr-si alloyed hot-formed steel |
| CN114807717A (en) * | 2022-04-25 | 2022-07-29 | 武汉钢铁有限公司 | Low-cost silicon-aluminum-calcium-carbon alloy, preparation method thereof and application thereof in converter metallurgy heat supplement |
| CN114807717B (en) * | 2022-04-25 | 2024-03-15 | 武汉钢铁有限公司 | Low-cost silicon-aluminum-calcium-carbon alloy, preparation method thereof and application thereof in converter metallurgy heat supplement |
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Application publication date: 20130109 |