CN105861774A - Casting method for lowering nodulation rate of aluminum steel tank for billet high-carbon steel - Google Patents
Casting method for lowering nodulation rate of aluminum steel tank for billet high-carbon steel Download PDFInfo
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- CN105861774A CN105861774A CN201510033692.4A CN201510033692A CN105861774A CN 105861774 A CN105861774 A CN 105861774A CN 201510033692 A CN201510033692 A CN 201510033692A CN 105861774 A CN105861774 A CN 105861774A
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Abstract
The invention relates to a casting method for lowering nodulation rate of aluminum steel tank for billet high-carbon steel. The method includes a steelmaking process, a refining process and a continuous casting process. 1) in the steelmaking process, the carbon content at converter molten steel endpoint is no higher than 0.28wt%, adding deoxdizing alloy, composition alloy and a carburant; 2) in the refining process and continuous casting process, heating, argon blowing and stirring are conducted after entrance of molten steel into an LF furnace; carburant and alloy are added to adjust the composition of molten steel, and low aluminum carbon iron is used for silicon alloying; before feeding line, the sulfur content is the molten steel is controlled below 0.013wt%, and a silico-calcium feeding amount is 1m / ton of steel; a first tank pulling rate is between (maximum pulling rate-0.2m / min) and the maximum pulling rate, and for other tank, by adjusting stopper aperture, the pulling rate is controlled at the maximum.
Description
Technical field
The present invention relates to technical field of steelmaking and refining, particularly relate to reduce dross rate during a kind of small billet high-carbon steel aluminum steel tank
Casting method.
Background technology
The nozzle clogging phenomenon occurred time during steel-making in casting cycle always perplexs a difficult problem of continuous casting working procedure, the mouth of a river
Dross not only reduces the production efficiency of conticaster, is also the one of the main reasons causing steel products to produce defect.The mouth of a river is tied
The basic reason of tumor is Reoxides or solid-oxide and the gathering of sulfide, such as the Al in molten steel2O3、MgAl2O4(magnesium
Aluminate) or CaS.Field trash is deposited on the mouth of a river, and the dross thing of formation brings many to affect can to product made from steel quality: 1)
Affect flow pattern and the flow field of Mold；2) floating of field trash in molten steel is affected；3) mold liquid level is caused
Catastrophic fluctuation；4) affect the internal soundness of strand, particularly fall in the strand of condensation after dross thing is washed away by molten steel,
Form bigger being mingled with；5) once dross is formed, grows up, and easily causing that wadding stream is disconnected waters accident.Cause the interruption of production.
Steelmaking In Anshan Iron And Steel Company head factory two work area has 2 small billet casting machines and 2 conventional slab casters, owing to the product category produced is more,
When producing small billet high-carbon steel, inevitably use used ladle when producing aluminum killed steel, and after using aluminum steel tank
Casting machine nozzle clogging in continuous small-billet casting production process often occurs, time serious, even causes disconnected watering.
Summary of the invention
The casting method of dross rate is reduced, by conservative control steel when the invention provides a kind of small billet high-carbon steel aluminum steel tank
Water constituent and technological parameter, reduce casting machine nozzle clogging rate, it is ensured that produces and is smoothed out, and can improve casting sequence and strand
Quality.
In order to achieve the above object, the present invention realizes by the following technical solutions:
Small billet high-carbon steel casting method of reduction dross rate during aluminum steel tank, including steel making working procedure, refining procedure and continuous casting work
Sequence,
1) in steel making working procedure, converter molten steel endpoint carbon content≤0.28wt%, it is separately added into de-during tapping according to sequencing
Oxygen alloy, composition alloy and carburant, when molten steel flows out 1/4, molten steel adds when flowing out 3/4；
2) in refine, continuous casting working procedure, molten steel enters LF furnace rear, heats 8～12 minutes, and Argon stirs 3～5 minutes,
Argon flow amount 300～500L/min. ton steel, takes first sample when molten steel face does not has floating carburant；After first sample counter sample, according to
Sampling inspection results adds carburant and alloy adjusts molten steel composition, and uses low aluminum silicon ferrum to carry out alloying with silicon；
Before line feeding, in molten steel, sulfur content controls at below 0.013wt%, and feeding silicon-calcium wire amount is 1m/ ton steel；
First tank pulling rate be the tank such as between (maximum pulling rate-0.2m/min)～maximum pulling rate, and other tanks are secondary includes changing tank process,
By adjusting stopper aperture, controlling pulling rate is maximum pulling rate.
During described converter molten steel endpoint carbon content ＞ 0.28wt%, blow carbon drop with oxygen rifle point.
Described deoxygenated alloy is Si-Ca-Ba ferrum, according to converter molten steel endpoint carbon content decision addition:
During 0.20wt%≤carbon content ＜ 0.28wt%, it is not added with Si-Ca-Ba ferrum；
During 0.15wt%≤carbon content ＜ 0.20wt%, add Si-Ca-Ba ferrum by 0.5～0.7kg/ ton steel；
During 0.10wt%≤carbon content ＜ 0.15wt%, add Si-Ca-Ba ferrum by 0.9～1.1kg/ ton steel；
During 0.06wt%≤carbon content ＜ 0.10wt%, add Si-Ca-Ba ferrum by 1.4～1.6kg/ ton steel.
Described composition alloy is siliceous 17-20wt%, silicomangan containing manganese 65-72wt%, the ferrosilicon of siliceous 72-80wt%.
Carbon content >=90wt% in described carburant.
Described alloy is the mid-carbon fe-mn containing manganese 75-82wt%.
In described low aluminum silicon ferrum, silicone content is 72-80wt%.
In described Si-Ca-Ba ferrum, calcium content is 8～14wt%, and silicone content is 45～55wt%, and barium content is 19～26wt%.
Compared with prior art, the invention has the beneficial effects as follows:
By conservative control molten steel composition and technological parameter, reduce casting machine nozzle clogging rate, through on-the-spot actual application, dross rate
It is reduced to less than 1%, it is ensured that produce and be smoothed out, and casting sequence and slab quality can be improved.
Detailed description of the invention
During small billet high-carbon steel aluminum steel tank of the present invention reduce dross rate casting method, including steel making working procedure, refining procedure and
Continuous casting working procedure,
1) in steel making working procedure, converter molten steel endpoint carbon content≤0.28wt%, it is separately added into de-during tapping according to sequencing
Oxygen alloy, composition alloy and carburant, when molten steel flows out 1/4, molten steel adds when flowing out 3/4；
2) in refine, continuous casting working procedure, molten steel enters LF furnace rear, heats 8～12 minutes, and Argon stirs 3～5 minutes,
Argon flow amount 300～500L/min. ton steel, takes first sample when molten steel face does not has floating carburant；After first sample counter sample, according to
Sampling inspection results adds carburant and alloy adjusts molten steel composition, and uses low aluminum silicon ferrum to carry out alloying with silicon；
Before line feeding, in molten steel, sulfur content controls at below 0.013wt%, and feeding silicon-calcium wire amount is 1m/ ton steel；
First tank pulling rate be the tank such as between (maximum pulling rate-0.2m/min)～maximum pulling rate, and other tanks are secondary includes changing tank process,
By adjusting stopper aperture, controlling pulling rate is maximum pulling rate.
During described converter molten steel endpoint carbon content ＞ 0.28wt%, blow carbon drop with oxygen rifle point.
Described deoxygenated alloy is Si-Ca-Ba ferrum, according to converter molten steel endpoint carbon content decision addition:
During 0.20wt%≤carbon content ＜ 0.28wt%, it is not added with Si-Ca-Ba ferrum；
During 0.15wt%≤carbon content ＜ 0.20wt%, add Si-Ca-Ba ferrum by 0.5～0.7kg/ ton steel；
During 0.10wt%≤carbon content ＜ 0.15wt%, add Si-Ca-Ba ferrum by 0.9～1.1kg/ ton steel；
During 0.06wt%≤carbon content ＜ 0.10wt%, add Si-Ca-Ba ferrum by 1.4～1.6kg/ ton steel.
Described composition alloy is siliceous 17-20wt%, silicomangan containing manganese 65-72wt%, the ferrosilicon of siliceous 72-80wt%.
Carbon content >=90wt% in described carburant.
Described alloy is the mid-carbon fe-mn containing manganese 75-82wt%.
In described low aluminum silicon ferrum, silicone content is 72-80wt%.
In described Si-Ca-Ba ferrum, calcium content is 8～14wt%, and silicone content is 45～55wt%, and barium content is 19～26wt%.
The present invention is on the basis of existing small billet high-carbon steel production technology, for the adverse effect after use aluminum steel tank to technique
Process and parameter are adjusted, and in addition to specified otherwise, remaining is prior art, are not added with at this repeating.
Following example 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 is not limited to following embodiment.In following embodiment, method therefor is as without saying especially
Bright it is conventional method.
[embodiment 1]
In steel making working procedure, converter molten steel endpoint carbon content 0.17wt%, add the Si-Ca-Ba ferrum of 0.6kg/ ton steel during tapping,
And add silicomangan, ferrosilicon and carburant by required molten steel composition, when molten steel flows out 1/4, when molten steel flows out 3/4
Add；
In refine, continuous casting working procedure, molten steel enters LF furnace rear, heats 8 minutes, and Argon stirs 3 minutes, argon flow amount 500L/min.
Ton steel, takes first sample when carbon is not floated in molten steel face；First sample is normal and after counter sample, according to sampling inspection results add carburant and
Mid-carbon fe-mn adjusts molten steel composition, and uses low aluminum carbon ferrum to carry out alloying with silicon.
Before line feeding, in molten steel, sulfur content controls at 0.012wt%, and feeding silicon-calcium wire amount is 1m/ ton steel；
First tank pulling rate is 2.8m/min, and other tanks include changing tank process, and by adjusting stopper aperture, controlling pulling rate is
3m/min。
In continuous casting production process, the casting machine mouth of a river is smoothed out without dross phenomenon, production process.
Claims (8)
1. small billet high-carbon steel casting method of reduction dross rate during aluminum steel tank, including steel making working procedure, refining procedure and company
Foundry work sequence, it is characterised in that:
1) in steel making working procedure, converter molten steel endpoint carbon content≤0.28wt%, it is separately added into de-during tapping according to sequencing
Oxygen alloy, composition alloy and carburant, when molten steel flows out 1/4, molten steel adds when flowing out 3/4；
2) in refine, continuous casting working procedure, molten steel enters LF furnace rear, heats 8～12 minutes, and Argon stirs 3～5 minutes,
Argon flow amount 300～500L/min. ton steel, takes first sample when molten steel face does not has floating carburant；After first sample counter sample, according to
Sampling inspection results adds carburant and alloy adjusts molten steel composition, and uses low aluminum silicon ferrum to carry out alloying with silicon；
Before line feeding, in molten steel, sulfur content controls at below 0.013wt%, and feeding silicon-calcium wire amount is 1m/ ton steel；
First tank pulling rate be the tank such as between (maximum pulling rate-0.2m/min)～maximum pulling rate, and other tanks are secondary includes changing tank process,
By adjusting stopper aperture, controlling pulling rate is maximum pulling rate.
The casting method of dross rate, its feature is reduced during small billet high-carbon steel aluminum steel tank the most according to claim 1
It is, during described converter molten steel endpoint carbon content ＞ 0.28wt%, blows carbon drop with oxygen rifle point.
The casting method of dross rate, its feature is reduced during small billet high-carbon steel aluminum steel tank the most according to claim 1
Being, described deoxygenated alloy is Si-Ca-Ba ferrum, according to converter molten steel endpoint carbon content decision addition:
During 0.20wt%≤carbon content ＜ 0.28wt%, it is not added with Si-Ca-Ba ferrum；
During 0.15wt%≤carbon content ＜ 0.20wt%, add Si-Ca-Ba ferrum by 0.5～0.7kg/ ton steel；
During 0.10wt%≤carbon content ＜ 0.15wt%, add Si-Ca-Ba ferrum by 0.9～1.1kg/ ton steel；
During 0.06wt%≤carbon content ＜ 0.10wt%, add Si-Ca-Ba ferrum by 1.4～1.6kg/ ton steel.
The casting method of dross rate, its feature is reduced during small billet high-carbon steel aluminum steel tank the most according to claim 1
Being, described composition alloy is siliceous 17-20wt%, silicomangan containing manganese 65-72wt%, the ferrosilicon of siliceous 72-80wt%.
The casting method of dross rate, its feature is reduced during small billet high-carbon steel aluminum steel tank the most according to claim 1
It is, carbon content >=90wt% in described carburant.
The casting method of dross rate, its feature is reduced during small billet high-carbon steel aluminum steel tank the most according to claim 1
Being, described alloy is the mid-carbon fe-mn containing manganese 75-82wt%.
The casting method of dross rate, its feature is reduced during small billet high-carbon steel aluminum steel tank the most according to claim 1
Being, in described low aluminum silicon ferrum, silicone content is 72-80wt%.
The casting method of dross rate, its feature is reduced during small billet high-carbon steel aluminum steel tank the most according to claim 3
Being, in described Si-Ca-Ba ferrum, calcium content is 8～14wt%, and silicone content is 45～55wt%, and barium content is 19～26wt%.
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| CN201510033692.4A CN105861774A (en) | 2015-01-23 | 2015-01-23 | Casting method for lowering nodulation rate of aluminum steel tank for billet high-carbon steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343808A (en) * | 2018-04-02 | 2019-10-18 | 潍坊特钢集团有限公司 | A kind of 45-70 steel grade wire rod smelting deoxidization technique |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1778974A (en) * | 2004-11-17 | 2006-05-31 | 首钢总公司 | Deoxidization of calcium-silicon barium for smelting 82B steel |
| CN103103307A (en) * | 2013-01-24 | 2013-05-15 | 首钢总公司 | Method for producing steel for low-nitrogen stranded wire by use of non-vacuum process of converter |
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2015
- 2015-01-23 CN CN201510033692.4A patent/CN105861774A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1778974A (en) * | 2004-11-17 | 2006-05-31 | 首钢总公司 | Deoxidization of calcium-silicon barium for smelting 82B steel |
| CN103103307A (en) * | 2013-01-24 | 2013-05-15 | 首钢总公司 | Method for producing steel for low-nitrogen stranded wire by use of non-vacuum process of converter |
Non-Patent Citations (1)
| Title |
|---|
| 齐志宇等: "高碳硅镇静钢小方坯水口结瘤分析及改进", 《鞍钢技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343808A (en) * | 2018-04-02 | 2019-10-18 | 潍坊特钢集团有限公司 | A kind of 45-70 steel grade wire rod smelting deoxidization technique |
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Application publication date: 20160817 |
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