CN105714010A - IF steel and ultra-low carbon steel converter silicon deoxidation method - Google Patents
IF steel and ultra-low carbon steel converter silicon deoxidation method Download PDFInfo
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- CN105714010A CN105714010A CN201410721226.0A CN201410721226A CN105714010A CN 105714010 A CN105714010 A CN 105714010A CN 201410721226 A CN201410721226 A CN 201410721226A CN 105714010 A CN105714010 A CN 105714010A
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Abstract
The present invention provides an IF steel and ultra-low carbon steel converter silicon deoxidation method, 1/4 to 1/3 of IF steel and ultra-low carbon steel treated by RH are tapped from a converter, silicon iron is added for pre-deoxidation, and the addition time is determined according to a lowest steel tapping oxygen value and a bottom blowing form; after point blowing, oxygen determination is not performed, molten steel oxygen value increase amount can be calculated and determined according to steel tapping end point carbon content and point blowing time, every 1 oxygen value is increased, 0.01-0.15kg / ton steel of silicon iron is added, if the addition amount is less than 25ppm, the addition amount is calculated according to 25ppm, and the maximum addition amount is not more than 2kg / ton steel. The IF steel and ultra-low carbon steel converter silicon deoxidation method can greatly reduce the production cost, the silicon content in the finished product is controlled to 0.005%-0.012%, and silicon content requirements of steel grades can be fully met. The casting state of molten steel can be significantly improved, flocculant flow is reduced, the number of times of water exchange outlets can be reduced, and after cold rolling, inclusion defects are also reduced.
Description
Technical field
The invention belongs to process for making technical field, particularly relate to the method that one need to carry out silicon deoxidation through RH process (vacuum deaeration refining) steel grade in converter tapping process.
Background technology
It is 500～600ppm that IF steel and ultra-low-carbon steel (C≤0.005%) enter the best oxygen value of RH stove (vacuum degassing furnace), the best oxygen value of converter tapping is 600～700ppm, but, in actual production process, the converter tapping oxygen value ratio more than 700ppm is up to 60%, therefore, it is common to adopt alloy to carry out pre-deoxidation, to reach to control the purpose into RH stove oxygen value.But there is problems in that 1, alloy deoxidation relatively costly；2, the Al produced after alloy deoxidation2O3Increase Al in the slag of top2O3Content, in RH processing procedure push up slag absorption deoxidation products reduced capability.
Owing to major part IF steel and ultra-low-carbon steel silicone content require≤0.03%, current boiling steel carries out pre-deoxidation and is generally adopted manganeisen, aluminum ferromanganese, carbon dust, iron-carbon alloy etc., from the viewpoint of the deoxidation products impact on Cleanliness of Molten Steel generated, carbon dust and iron-carbon alloy are optimal deoxygenated alloys, but find in production practices, add carbon dust and iron-carbon alloy carries out pre-deoxidation, the problem that the big tank bits of tapping process go up often occurs, therefore constrains the development of this technology.The MnO that manganeisen deoxidation produces increases top slag oxidizing, it addition, part IF steel and ultra-low-carbon steel Fe content require relatively low, does not therefore generally adopt manganeisen pre-deoxidation.Owing to, under hyperoxic conditions, silicon is thorough with the reaction angle of oxygen, and returns silicon hardly when oxidizing slag, and based on this, the present invention develops RH and directly goes up the technique that steel grade adopts ferrosilicon pre-deoxidation.
Summary of the invention
The present invention provides the converter silicon method of deoxidation of a kind of IF steel and ultra-low-carbon steel, its object is to solution IF steel and ultra-low-carbon steel is come out of the stove in process, cause the problem that inclusion defects increases owing to oxygen content is high, and reduce deoxidation cost.
For this, the solution that the present invention takes is:
The converter silicon method of deoxidation of a kind of IF steel and ultra-low-carbon steel, it is characterised in that for through the RH IF steel processed and ultra-low-carbon steel, ferrosilicon need to being adopted in converter tapping process to substitute aluminum ferromanganese and carry out pre-deoxidation, its method particularly includes:
(1) ferrosilicon adds opportunity: time between converter tapping 1/4～1/3, adds ferrosilicon and carries out pre-deoxidation, and addition is determined according to converter tapping oxygen value and bottom blowing form opportunity, it is necessary to the minimum tapping oxygen value adding ferrosilicon is:
(2) oxygen value increase amount is determined: point does not carry out determining oxygen after blowing, and blows Time Calculation determine molten steel oxygen value increase amount according to tapping endpoint carbon content and point, and its circular is:
(3) ferrosilicon addition: oxygen value often increases 25ppm, adds ferrosilicon 0.01-0.15kg/ ton steel, presses 25ppm less than 25ppm and calculates, and ferrosilicon maximum adding quantity is less than 2kg/ ton steel.
The invention have the benefit that
1, the maximum of finished silicon content of the present invention is 0.012%, and minima is 0.005%, fully meets the requirement of steel grade silicone content.
2, aluminum ferromanganese and ferrosilicon price are than for 2:1, and deoxidation cost is than for 3.5:1, and therefore the present invention can be greatly lowered production cost.
3, the molten steel that the inventive method is smelted, casting condition be improved significantly, wadding stream alleviates, and changes mouth of a river number of times and reduces, and cold rolling after inclusion defect also decrease.
Detailed description of the invention
RH of the present invention processes the converter silicon method of deoxidation of IF steel and ultra-low-carbon steel, is primarily directed to the straight upper RH IF steel processed and ultra-low-carbon steel, adopts ferrosilicon to substitute aluminum ferromanganese and carry out pre-deoxidation in converter tapping process.Its method particularly includes:
1, ferrosilicon adds opportunity:
Time between converter tapping 1/4～1/3, adding ferrosilicon and carry out pre-deoxidation, addition is determined according to converter tapping oxygen value and bottom blowing form opportunity, it is necessary to the minimum tapping oxygen value adding ferrosilicon is:
2, oxygen value increase amount is determined:
Point does not carry out determining oxygen after blowing, and blows Time Calculation determine molten steel oxygen value increase amount according to tapping endpoint carbon content and point, and its circular is:
3, ferrosilicon addition:
Oxygen value often increases 25ppm, adds ferrosilicon 0.01～0.15kg/ ton steel, presses 25ppm less than 25ppm and calculates, and ferrosilicon maximum adding quantity is less than 2kg/ ton steel.
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
Steel grade ST14,260 tons of converter smeltings, there is bottom blowing.
Converter tapping carbon is 0.04%, oxygen value 800ppm, and point blows 20s, increases oxygen value 11ppm, and total oxygen value is pressed 811ppm and calculated.Adding Antaciron when tapping 1/3, addition is 50kg.After process, ST14 finished product Si content is 0.01%, fully meets the requirement of steel grade silicone content.
Embodiment 2:
Steel grade ST14,260 tons of converter smeltings, without bottom blowing.
Converter tapping carbon is 0.055%, oxygen value 900ppm, and point blows 25s, increases oxygen value 10ppm, and total oxygen value is pressed 910ppm and calculated.Adding Antaciron when tapping 1/4, addition is 20kg.After process, ST14 finished product Si content is 0.009%, fully meets the requirement of steel grade silicone content.
Claims (1)
1. the converter silicon method of deoxidation of an IF steel and ultra-low-carbon steel, it is characterised in that for through the RH IF steel processed and ultra-low-carbon steel, ferrosilicon need to being adopted in converter tapping process to substitute aluminum ferromanganese and carry out pre-deoxidation, its method particularly includes:
(1) ferrosilicon adds opportunity: time between converter tapping 1/4～1/3, adds ferrosilicon and carries out pre-deoxidation, and addition is determined according to converter tapping oxygen value and bottom blowing form opportunity, it is necessary to the minimum tapping oxygen value adding ferrosilicon is:
(2) oxygen value increase amount is determined: point does not carry out determining oxygen after blowing, and blows Time Calculation determine molten steel oxygen value increase amount according to tapping endpoint carbon content and point, and its circular is:
(3) ferrosilicon addition: oxygen value often increases 25ppm, adds ferrosilicon 0.01-0.15kg/ ton steel, presses 25ppm less than 25ppm and calculates, and ferrosilicon maximum adding quantity is less than 2kg/ ton steel.
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| CN201410721226.0A CN105714010A (en) | 2014-12-01 | 2014-12-01 | IF steel and ultra-low carbon steel converter silicon deoxidation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106844831A (en) * | 2016-12-08 | 2017-06-13 | 邯钢集团邯宝钢铁有限公司 | A kind of cold rolling method for being mingled with class defect of optimization IF steel smeltings parameter reduction |
| CN108570533A (en) * | 2018-05-17 | 2018-09-25 | 山东钢铁股份有限公司 | A kind of deoxidation slag charge suitable for Si killed steel |
| CN111349755A (en) * | 2020-03-17 | 2020-06-30 | 本钢板材股份有限公司 | Direct supply silicon control process for SAE1006CrQZ steel grade |
| CN113957199A (en) * | 2021-10-20 | 2022-01-21 | 山东钢铁集团日照有限公司 | Ultra-low carbon IF steel molten steel peroxidation treatment method |
| CN115558736A (en) * | 2022-10-17 | 2023-01-03 | 湖南华菱涟源钢铁有限公司 | Method for improving molten steel cleanliness of IF steel |
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| CN103266202A (en) * | 2013-06-11 | 2013-08-28 | 鞍钢股份有限公司 | Method for reducing ultra-low carbon steel flocculating flow |
| CN103276151A (en) * | 2013-06-06 | 2013-09-04 | 鞍钢股份有限公司 | Deoxidation method of low-silicon steel by utilization of silicon alloys |
| CN103468875A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | RH processing method for interstitial-free steel |
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2014
- 2014-12-01 CN CN201410721226.0A patent/CN105714010A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276151A (en) * | 2013-06-06 | 2013-09-04 | 鞍钢股份有限公司 | Deoxidation method of low-silicon steel by utilization of silicon alloys |
| CN103266202A (en) * | 2013-06-11 | 2013-08-28 | 鞍钢股份有限公司 | Method for reducing ultra-low carbon steel flocculating flow |
| CN103468875A (en) * | 2013-08-29 | 2013-12-25 | 鞍钢股份有限公司 | RH processing method for interstitial-free steel |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106844831A (en) * | 2016-12-08 | 2017-06-13 | 邯钢集团邯宝钢铁有限公司 | A kind of cold rolling method for being mingled with class defect of optimization IF steel smeltings parameter reduction |
| CN106844831B (en) * | 2016-12-08 | 2020-01-21 | 邯钢集团邯宝钢铁有限公司 | Method for optimizing IF steel smelting parameters and reducing cold rolling inclusion defects |
| CN108570533A (en) * | 2018-05-17 | 2018-09-25 | 山东钢铁股份有限公司 | A kind of deoxidation slag charge suitable for Si killed steel |
| CN108570533B (en) * | 2018-05-17 | 2019-11-15 | 山东钢铁股份有限公司 | A kind of deoxidation slag charge suitable for Si killed steel |
| CN111349755A (en) * | 2020-03-17 | 2020-06-30 | 本钢板材股份有限公司 | Direct supply silicon control process for SAE1006CrQZ steel grade |
| CN111349755B (en) * | 2020-03-17 | 2022-02-08 | 本钢板材股份有限公司 | Direct supply silicon control process for SAE1006CrQZ steel grade |
| CN113957199A (en) * | 2021-10-20 | 2022-01-21 | 山东钢铁集团日照有限公司 | Ultra-low carbon IF steel molten steel peroxidation treatment method |
| CN115558736A (en) * | 2022-10-17 | 2023-01-03 | 湖南华菱涟源钢铁有限公司 | Method for improving molten steel cleanliness of IF steel |
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Application publication date: 20160629 |