CN106544473A - Ultra-low carbon IF steel composite deoxidation method - Google Patents
Ultra-low carbon IF steel composite deoxidation method Download PDFInfo
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- CN106544473A CN106544473A CN201510591164.0A CN201510591164A CN106544473A CN 106544473 A CN106544473 A CN 106544473A CN 201510591164 A CN201510591164 A CN 201510591164A CN 106544473 A CN106544473 A CN 106544473A
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- Prior art keywords
- steel
- iron
- deoxidation
- add
- molten steel
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- 239000010959 steel Substances 0.000 title claims abstract description 64
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 10
- 239000002131 composite material Substances 0.000 title abstract 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- 238000005261 decarburization Methods 0.000 claims abstract description 6
- 238000007872 degassing Methods 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052593 corundum Inorganic materials 0.000 abstract description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 3
- OQBFTZVVLMJNTB-UHFFFAOYSA-N [Ca].[Fe].[Si].[Ba] Chemical compound [Ca].[Fe].[Si].[Ba] OQBFTZVVLMJNTB-UHFFFAOYSA-N 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000007667 floating Methods 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a composite deoxidation method for ultra-low carbon IF steel, which comprises the following steps: 1) after RH vacuum decarburization and degassing treatment, adding a composite deoxidizer silico-calcium-barium-iron according to the requirement of the weight percentage content of silicon in finished IF steel for pre-deoxidation: 2) and after the silicon-calcium-barium-iron is added, RH net circulation is carried out for 3-5 min, the oxygen content of the molten steel is measured, and aluminum particles are added according to the oxygen content of the molten steel by a conventional deoxidation process for final deoxidation. Compared with the prior art, the invention has the beneficial effects that: 1) can reduce Al in molten steel2O3The generation of impurities is beneficial to Al2O3Removing impurities in the wastewater; 2) composite stripperThe oxygen products are mainly BaO, CaO and Al2O3The inclusion is easy to float upwards, has small size, does not block a water gap and ensures smooth pouring; 3) the cleanliness of molten steel is obviously improved, the quality of products such as automobile plate steel with higher surface quality requirement is effectively improved, the rejection rate of impurities is reduced, and the overall performance of IF steel is improved; 4) simple and easy operation and low cost.
Description
Technical field
The present invention relates to a kind of molten steel deoxygenation method, more particularly to a kind of ultra low carbon IF steel of employing RH application of vacuum is compound de-
The method of oxygen.
Background technology
At present, both at home and abroad for IF steel Control for Oxygen Content mainly using the method that aluminum shot deoxidation is added in molten steel, its deoxidation
Product is Al2O3, but due to repeatedly adjusting aluminium in RH techniques sometimes, directly influence Al2O3The floating being mingled with, if impurity
Float not thoroughly, Al in the molten steel such as automobile slab can be caused2O3It is mingled with and increases, inclusion defect increases, affects product quality.
The content of the invention
The invention provides a kind of method of ultra low carbon IF steel complex deoxidization, before aluminum shot deoxidation is added, is initially charged complex deoxidization
Agent Si-Ca-Ba iron carries out pre-deoxidation, is that deoxidation products floating creates favorable conditions, can effectively facilitate deoxidation products floating, carry
The cleanliness factor of high molten steel, improve product quality.
In order to achieve the above object, the present invention employs the following technical solutions realization：
A kind of method of ultra low carbon IF steel complex deoxidization, comprises the steps：
1), after RH vacuum decarburizations and degassing process terminate, require to add according to the weight percent content of silicon in finished product IF steel
Double deoxidizer Si-Ca-Ba iron carries out pre-deoxidation：
During finished steel Si≤0.02%：Add Si-Ca-Ba iron 0.15～0.25kg/t steel；
During finished steel Si≤0.03%：Add Si-Ca-Ba iron 0.20～0.30kg/t steel；
During 0.03 ＜ Si≤0.08% of finished steel：Add Si-Ca-Ba iron 0.45～0.55kg/t steel；
During finished steel Si ＞ 0.08%：Add Si-Ca-Ba iron 0.60～0.65kg/t steel；
2), after adding Si-Ca-Ba iron, RH 3～5min of net circulation measure Oxygen Content in Liquid Steel, further according to Oxygen Content in Liquid Steel by normal
Rule deoxidization technique adds aluminum shot to carry out final deoxidizing.
Compared with prior art, the invention has the beneficial effects as follows：
1) before aluminum shot deoxidation is added, being initially charged double deoxidizer Si-Ca-Ba iron carries out pre-deoxidation, it is possible to reduce Al in molten steel2O3
The generation being mingled with, is conducive to Al2O3It is mingled with floating to exclude；
2) complex deoxidization product is mainly BaO, CaO and Al2O3Deng complex inclusion, the field trash be easy to float, chi
Very little little (generally less than 10 μm), do not block the mouth of a river, it is ensured that cast is smooth；
3) cleanliness factor of molten steel is significantly improved, the quality of the products such as the higher automobile slab of surface quality requirements is effectively improved,
Reduction is mingled with percent defective, improves the overall performance of IF steel；
4) operation is simple, low cost.
Specific embodiment
A kind of method of ultra low carbon IF steel complex deoxidization of the present invention, comprises the steps：
1), after RH vacuum decarburizations and degassing process terminate, require to add according to the weight percent content of silicon in finished product IF steel
Double deoxidizer Si-Ca-Ba iron carries out pre-deoxidation：
During finished steel Si≤0.02%：Add Si-Ca-Ba iron 0.15～0.25kg/t steel；
During finished steel Si≤0.03%：Add Si-Ca-Ba iron 0.20～0.30kg/t steel；
During 0.03 ＜ Si≤0.08% of finished steel：Add Si-Ca-Ba iron 0.45～0.55kg/t steel；
During finished steel Si ＞ 0.08%：Add Si-Ca-Ba iron 0.60～0.65kg/t steel；
2), after adding Si-Ca-Ba iron, RH 3～5min of net circulation measure Oxygen Content in Liquid Steel, further according to Oxygen Content in Liquid Steel by normal
Rule deoxidization technique adds aluminum shot to carry out final deoxidizing.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and specific
Operating process, but protection scope of the present invention is not limited to following embodiments.In following embodiments, method therefor such as nothing is especially said
It is bright to be conventional method.
【Embodiment one】
In the present embodiment, using 185 tons of ladles in RH refining production ultra low carbon IF steels.
After RH vacuum decarburization degassing process terminates, it is 450ppm to determine an Oxygen Content in Liquid Steel, according to finished steel Si≤0.02%
Silicone content require, add Si-Ca-Ba iron 40kg；Oxygen 361ppm is determined after circulation 3min, 110kg aluminium is added according to oxygen content
Grain carries out final deoxidizing.
After above-mentioned technical process, in basket pouring smoothly, without wadding flow phenomenon, tundish total oxygen is 0.0011% to molten steel,
It was found that inclusion defect.
【Embodiment two】
In the present embodiment, using 250 tons of ladles in RH refining production ultra low carbon IF steels.
After RH vacuum decarburization degassing process terminates, it is 402ppm to determine an Oxygen Content in Liquid Steel, according to finished steel Si≤0.03%
Silicone content require, add Si-Ca-Ba iron 65kg；Oxygen 317ppm is determined after circulation 3min, 130kg aluminium is added according to oxygen content
Grain carries out final deoxidizing.
After above-mentioned technical process, in basket pouring smoothly, without wadding flow phenomenon, tundish total oxygen is 0.0013% to molten steel；
It was found that inclusion defect.
Claims (1)
1. a kind of method of ultra low carbon IF steel complex deoxidization, it is characterised in that comprise the steps：
1), after RH vacuum decarburizations and degassing process terminate, require to add according to the weight percent content of silicon in finished product IF steel
Double deoxidizer Si-Ca-Ba iron carries out pre-deoxidation：
During finished steel Si≤0.02%：Add Si-Ca-Ba iron 0.15～0.25kg/t steel；
During finished steel Si≤0.03%：Add Si-Ca-Ba iron 0.20～0.30kg/t steel；
During 0.03 ＜ Si≤0.08% of finished steel：Add Si-Ca-Ba iron 0.45～0.55kg/t steel；
During finished steel Si ＞ 0.08%：Add Si-Ca-Ba iron 0.60～0.65kg/t steel；
2), after adding Si-Ca-Ba iron, RH 3～5min of net circulation measure Oxygen Content in Liquid Steel, further according to Oxygen Content in Liquid Steel by normal
Rule deoxidization technique adds aluminum shot to carry out final deoxidizing.
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| CN201510591164.0A CN106544473A (en) | 2015-09-17 | 2015-09-17 | Ultra-low carbon IF steel composite deoxidation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510591164.0A CN106544473A (en) | 2015-09-17 | 2015-09-17 | Ultra-low carbon IF steel composite deoxidation method |
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| CN106544473A true CN106544473A (en) | 2017-03-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107354269A (en) * | 2017-05-26 | 2017-11-17 | 内蒙古包钢钢联股份有限公司 | The method that RH complex deoxidizations produce ultra-low-carbon steel |
| CN109487034A (en) * | 2019-01-02 | 2019-03-19 | 鞍钢股份有限公司 | Method for producing IF steel by composite deoxidation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266202A (en) * | 2013-06-11 | 2013-08-28 | 鞍钢股份有限公司 | Method for reducing flocculation flow of ultra-low carbon steel |
| CN103276151A (en) * | 2013-06-06 | 2013-09-04 | 鞍钢股份有限公司 | Method for deoxidizing low-silicon steel by using silicon alloy |
-
2015
- 2015-09-17 CN CN201510591164.0A patent/CN106544473A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276151A (en) * | 2013-06-06 | 2013-09-04 | 鞍钢股份有限公司 | Method for deoxidizing low-silicon steel by using silicon alloy |
| CN103266202A (en) * | 2013-06-11 | 2013-08-28 | 鞍钢股份有限公司 | Method for reducing flocculation flow of ultra-low carbon steel |
Non-Patent Citations (1)
| Title |
|---|
| 李镇 等: "鞍钢生产IF钢的进展与实践", 《鞍钢技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107354269A (en) * | 2017-05-26 | 2017-11-17 | 内蒙古包钢钢联股份有限公司 | The method that RH complex deoxidizations produce ultra-low-carbon steel |
| CN109487034A (en) * | 2019-01-02 | 2019-03-19 | 鞍钢股份有限公司 | Method for producing IF steel by composite deoxidation |
| CN109487034B (en) * | 2019-01-02 | 2020-07-17 | 鞍钢股份有限公司 | Method for producing IF steel by composite deoxidation |
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