CN105499526A - Method for reducing total oxygen content of aluminum killed steel continuous casting head blank - Google Patents
Method for reducing total oxygen content of aluminum killed steel continuous casting head blank Download PDFInfo
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- CN105499526A CN105499526A CN201410499129.1A CN201410499129A CN105499526A CN 105499526 A CN105499526 A CN 105499526A CN 201410499129 A CN201410499129 A CN 201410499129A CN 105499526 A CN105499526 A CN 105499526A
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- Prior art keywords
- tundish
- low
- continuous casting
- oxygen content
- steel
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 32
- 239000001301 oxygen Substances 0.000 title claims abstract description 32
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 38
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 abstract description 6
- 230000003749 cleanliness Effects 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 abstract 1
- 238000003556 assay Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052834 spessartine Inorganic materials 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for reducing the total oxygen content of an aluminum killed steel continuous casting head blank, which comprises the following steps: 1) preparing low-carbon ferrosilicon before the start of continuous casting; 2) dividing the needed low-carbon ferrosilicon into parts; 3) after the tundish is opened to a pouring position and positioning is completed, all the low-carbon silicon iron is put into the turbulator of the tundish; 4) and when casting is started, the sliding plate of the molten steel tank is opened in the full stroke, and molten steel is injected into the tundish by the maximum injection flow. Compared with the prior art, the invention has the beneficial effects that: 1) the low-carbon ferrosilicon which is added in the tundish in advance is used for reacting with the residual oxygen in the tundish to generate inclusions which easily float upwards at the initial casting stage, so that secondary oxidation of the refractory of the tundish and the residual oxygen in the tundish on molten steel is reduced, the inclusions of alumina which are easily gathered in the steel are reduced, and the total oxygen content of a head billet is greatly reduced; 2) the thrown low-carbon ferrosilicon has a slagging function, can improve the cleanliness of the aluminum killed steel continuous casting head blank and reduce the impurity rejection rate of the head blank; 3) the operation is simple and the control is easy.
Description
Technical field
The present invention relates to steel industry continuous casting technology field, particularly relate to a kind of method reducing aluminum killed steel continuous casting head base total oxygen content.
Background technology
The continuous casting incipient stage is and typical transient casting process.After ladle slide plate is opened, molten steel flows in tundish, and molten steel not only produces with the refractory material of tundish inwall and contacts and wash away, and Cleanliness of Molten Steel is polluted, aluminum killed steel exposes in atmosphere simultaneously, also can produce strong oxidation and produce a large amount of MnO and Al
2o
3be mingled with.Therefore, continuous casting head base is the block casting base that in whole casting process, internal soundness is the poorest, and its total oxygen content is relatively high.Domestic and international Ge great steel mill is at present for the solution that this problem is not good.
Summary of the invention
The invention provides a kind of method reducing aluminum killed steel continuous casting head base total oxygen content, by in the aluminum killed steel continuous casting incipient stage, in tundish turbulator, drop into low-carbon ferrosilicon reach the object reducing continuous casting head base total oxygen content, and a base cleanliness factor is well improved.
In order to achieve the above object, the present invention realizes by the following technical solutions:
Reduce a method for aluminum killed steel continuous casting head base total oxygen content, comprise the steps:
1), before continuous casting starts, prepare dry low-carbon ferrosilicon, its composition is: Si75 ~ 80%; C≤0.015%; Mn≤0.15%; P≤0.02; S≤0.01; Ti≤0.020; Al≤0.030; Ca≤0.05;
2) low-carbon ferrosilicon input amount calculates by 0.5 ~ 0.55kg/t steel, and required low-carbon ferrosilicon is divided into several parts by 5 ~ 8kg/ part;
3) reach cast position at tundish and after completing location, low-carbon ferrosilicon all put in the turbulator of tundish;
4) open when watering, ladle slide plate total travel is opened, and is injected in tundish by molten steel with maximum beam.
Compared with prior art, the invention has the beneficial effects as follows:
1) utilize residual oxygen in the low-carbon ferrosilicon and tundish that add in advance in tundish react to generate the easy field trash floated starting the initial stage of casting, alleviate oxygen that the resistance to material of tundish and Bao Nei remain to the secondary oxidation of molten steel, thus the aluminate easily assembled in steel is reduced, significantly reduce the total oxygen content of head base;
2) low-carbon ferrosilicon thrown in has slag making function, can improve the cleanliness factor of aluminum killed steel continuous casting head base, reduces head base and is mingled with percent defective;
3) simple to operate, easily control.
Detailed description of the invention
Reduce a method for aluminum killed steel continuous casting head base total oxygen content, comprise the steps:
1), before continuous casting starts, prepare dry low-carbon ferrosilicon, its composition is: Si75 ~ 80%; C≤0.015%; Mn≤0.15%; P≤0.02; S≤0.01; Ti≤0.020; Al≤0.030; Ca≤0.05;
2) low-carbon ferrosilicon input amount calculates by 0.5 ~ 0.55kg/t steel, and required low-carbon ferrosilicon is divided into several parts by 5 ~ 8kg/ part;
3) reach cast position at tundish and after completing location, low-carbon ferrosilicon all put in the turbulator of tundish;
4) open when watering, ladle slide plate total travel is opened, and is injected in tundish by molten steel with maximum beam.
In the continuous casting incipient stage, after the low-carbon ferrosilicon added to tundish melts in molten steel, in molten steel, silicone content increases, and reacts generate SiO with oxygen
2field trash, SiO
2with MnO and Al in molten steel
2o
3spessartine duplex impurity (the 3MnOAl of low, the spherical easy floating of fusing point is formed after reaction
2o
33SiO
2), in floating-upward process, also can catch alundum (Al2O3) be mingled with removal of jointly floating, contrast with conventional method, the present invention makes continuous casting head base total oxygen content significantly reduce, and head base cleanliness factor is well improved, and reduces head base and is mingled with percent defective.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.
[embodiment 1]
Be that 230mm slab caster carries out contrast test at thickness, the full bag weight of tundish is 55 tons, and production steel grade is carbon aluminium-killed steel.
Comparative example: pour into a mould 52 tons of molten steel, do not do specially treated, carry out the inspection of multiple spot total oxygen content to continuous casting head base, assay continuous casting head base total oxygen content average is 53ppm.
Embodiment: pour into a mould 50 tons of molten steel, calculates low-carbon ferrosilicon input amount by 0.5kg/t steel, needs 25kg low-carbon ferrosilicon altogether.Low-carbon ferrosilicon composition is selected to be Si:80%; C:0.012; Mn:0.15; P:0.18; S:0.006; Ti:0.013; Al:0.021; Ca:0.047; Required low-carbon ferrosilicon is divided into 5 parts by 5kg/ part, reaches cast position at tundish and after completing location, low-carbon ferrosilicon all put in the turbulator of tundish; Open when watering, ladle slide plate total travel is opened, and is injected in tundish by molten steel with maximum beam.All the other operating process are identical with comparative example, carry out the inspection of multiple spot total oxygen content to continuous casting head base, and assay continuous casting head base total oxygen content average is 30ppm.
[embodiment 2]
Be that 170mm slab caster carries out contrast test at thickness, the full bag weight of tundish is 70 tons, and producing steel grade is Ultra-low carbon aluminum killed steel.
Comparative example: pour into a mould 65 tons of molten steel, do not do specially treated, carry out the inspection of multiple spot total oxygen content to continuous casting head base, assay continuous casting head base total oxygen content average is 47ppm.
Embodiment: pour into a mould 60 tons of molten steel, calculates low-carbon ferrosilicon input amount by 0.55kg/t steel, needs 33kg low-carbon ferrosilicon altogether.Low-carbon ferrosilicon composition is selected to be Si:80%; C:0.012; Mn:0.15; P:0.18; S:0.006; Ti:0.013; Al:0.021; Ca:0.047; Required low-carbon ferrosilicon is divided into 6 parts by 5.5kg/ part, reaches cast position at tundish and after completing location, low-carbon ferrosilicon all put in the turbulator of tundish; Open when watering, ladle slide plate total travel is opened, and is injected in tundish by molten steel with maximum beam.All the other operating process are identical with comparative example, carry out the inspection of multiple spot total oxygen content to continuous casting head base, and assay continuous casting head base total oxygen content average is 26ppm.
[embodiment 3]
Be that 135mm slab caster carries out contrast test at thickness, the full bag weight of tundish is 30 tons, and production steel grade is carbon aluminium-killed steel.
Comparative example: pour into a mould 30 tons of molten steel, do not do specially treated, carry out the inspection of multiple spot total oxygen content to continuous casting head base, assay continuous casting head base total oxygen content average is 50ppm.
Embodiment: pour into a mould 30 tons of molten steel, calculates low-carbon ferrosilicon input amount by 0.5kg/t steel, needs 15kg low-carbon ferrosilicon altogether, select low-carbon ferrosilicon composition to be Si:80%; C:0.012; Mn:0.15; P:0.18; S:0.006; Ti:0.013; Al:0.021; Ca:0.047; Required low-carbon ferrosilicon is divided into 3 parts by 5kg/ part, reaches cast position at tundish and after completing location, low-carbon ferrosilicon all put in the turbulator of tundish; Open when watering, ladle slide plate total travel is opened, and is injected in tundish by molten steel with maximum beam.All the other operating process are identical with comparative example, carry out the inspection of multiple spot total oxygen content to continuous casting head base, and assay continuous casting head base total oxygen content average is 28ppm.
A kind of method reducing aluminum killed steel continuous casting head base total oxygen content of the present invention effectively can reduce continuous casting head base total oxygen content, and simple, can apply on the conticaster of any use tundish.
Claims (1)
1. reduce a method for aluminum killed steel continuous casting head base total oxygen content, it is characterized in that, comprise the steps:
1), before continuous casting starts, prepare dry low-carbon ferrosilicon, its composition is: Si75 ~ 80%; C≤0.015%; Mn≤0.15%; P≤0.02; S≤0.01; Ti≤0.020; Al≤0.030; Ca≤0.05;
2) low-carbon ferrosilicon input amount 0.5 ~ 0.55kg/t steel calculates, and required low-carbon ferrosilicon is divided into several parts by 5 ~ 8kg/ part;
3) reach cast position at tundish and after completing location, low-carbon ferrosilicon all put in the turbulator of tundish;
4) open when watering, ladle slide plate total travel is opened, and is injected in tundish by molten steel with maximum beam.
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|---|---|---|---|
| CN201410499129.1A CN105499526A (en) | 2014-09-25 | 2014-09-25 | Method for reducing total oxygen content of aluminum killed steel continuous casting head blank |
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| CN201410499129.1A CN105499526A (en) | 2014-09-25 | 2014-09-25 | Method for reducing total oxygen content of aluminum killed steel continuous casting head blank |
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| CN201410499129.1A Pending CN105499526A (en) | 2014-09-25 | 2014-09-25 | Method for reducing total oxygen content of aluminum killed steel continuous casting head blank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108971444A (en) * | 2018-06-29 | 2018-12-11 | 首钢京唐钢铁联合有限责任公司 | Method for improving IF steel casting blank head blank quality |
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| CN108971444A (en) * | 2018-06-29 | 2018-12-11 | 首钢京唐钢铁联合有限责任公司 | Method for improving IF steel casting blank head blank quality |
| CN108971444B (en) * | 2018-06-29 | 2020-06-12 | 首钢京唐钢铁联合有限责任公司 | Method for improving IF steel casting blank head blank quality |
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