CN107008890A - A kind of method for reducing tundish dissolved aluminum scaling loss - Google Patents

A kind of method for reducing tundish dissolved aluminum scaling loss Download PDF

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Publication number
CN107008890A
CN107008890A CN201610057495.0A CN201610057495A CN107008890A CN 107008890 A CN107008890 A CN 107008890A CN 201610057495 A CN201610057495 A CN 201610057495A CN 107008890 A CN107008890 A CN 107008890A
Authority
CN
China
Prior art keywords
ladle
long nozzle
steel
molten steel
tundish
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610057495.0A
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Chinese (zh)
Inventor
苏小利
戚丕全
于海岐
李金莲
殷东明
李黎明
王金辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Angang Steel Co Ltd
Original Assignee
Angang Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN201610057495.0A priority Critical patent/CN107008890A/en
Publication of CN107008890A publication Critical patent/CN107008890A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00Treatment of fused masses in the ladle or the supply runners before casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002Treatment with gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50Pouring-nozzles
    • B22D41/58Pouring-nozzles with gas injecting means

Abstract

The present invention provides a kind of method for reducing tundish dissolved aluminum scaling loss, and liquid steel level adjusts benchmark without the maximum Argon amount risen as argon gas using around long nozzle;Rise suddenly if the manipulator vibrations of cast latter stage produce slag surface around mutation or long nozzle, slide plate is closed immediately;Ladle is dropped into long nozzle lower edge away from 90~105mm of molten steel surface and opens slide plate again, big tank operation is entirely changed and is completed in 150s.Coverture reaches that more than 35t is added in tundish weight, it is ensured that molten steel surface is without exposed, and pouring area, stopper hole and thermometric thief hole add 300~500kg;Opened afterwards per tank and add 180~200kg in each region after pouring;In ladle casting process, the liquid level of molten steel reaches more than 1000mm in tundish, and long nozzle enters below liquid steel level 300mm, and is aided with carbonization rice husk, it is to avoid molten steel surface coverture crusts.The present invention can make the control of tundish dissolved aluminum scaling loss in below 19ppm, be effectively improved Molten Steel Cleanliness, improve slab quality.

Description

A kind of method for reducing tundish dissolved aluminum scaling loss
Technical field
The invention belongs to process for making technical field, more particularly to a kind of method for reducing tundish dissolved aluminum scaling loss.
Background technology
At present, it is more complicated due to causing tundish Als scaling loss, therefore so far, both at home and abroad to Als scaling loss not yet Ripe process system is formed, is caused in produced on-site practice, the fluctuation of Als scaling loss is larger always, directly affects the pure of molten steel Cleanliness, causes strand inherent quality to decline.
The content of the invention
The present invention is intended to provide one kind can reduce tundish dissolved aluminum scaling loss, improve Molten Steel Cleanliness, improve the reduction of slab quality The method of tundish dissolved aluminum scaling loss.
Therefore, the technical solution that the present invention is taken is:
A kind of method for reducing tundish dissolved aluminum scaling loss, it is characterised in that:
(1) tundish long nozzle Argon amount is controlled:Liquid steel level is controlled without the maximum Argon amount risen as adjustment using around long nozzle Benchmark processed, prevents air-breathing or molten steel surface from seething;
(2) slag tapping volume of steel ladle is controlled:Ladle pours into a mould latter stage, if the vibrations of manipulator are produced around mutation or long nozzle Slag surface rise suddenly, close slide gate nozzle immediately, and with the use of automatic slag check device, reduce ladle slag;
(3) ladle key points for operation are changed:
A. ladle is poured after panoramic table rotation, checks whether long nozzle inner chamber has residual steel, if residual steel needs to carry out clearly Wash, especially long nozzle sealing table top is that long nozzle can not be with the presence of residual steel with the small mouth of a river contact plane of ladle, and ensures sealing station Face if there is sealing table top breakage, then must change long nozzle without breakage;
B. when next ladle reaches cast position, prepare that long nozzle is installed, it is ensured that the small mouth of a river position of ladle and long nozzle Aligned above and below position;
C. ladle is dropped into long nozzle lower edge away from opening ladle slide plate after 90~105mm of molten steel surface again, after molten steel flows down Gradually increase slide plate aperture;
D. ensure that whole ladle of changing operates the completion in 150s;
(4) coverture adds control:Casting machine, which is opened, pours the first tank molten steel, and coverture reaches that more than 35t is added in tundish weight, Addition be ensure molten steel surface without it is exposed be principle, pouring area, stopper hole and thermometric thief hole are uniformly added into 300~500kg; Opened afterwards per tank steel and uniformly add 180~200kg each region is each after pouring;
(5) ladle is in casting process, and the liquid level of molten steel reaches more than 1000mm in tundish, and long nozzle enters steel Below water level 300mm, in addition to ultra-low-carbon steel, remaining steel grade is aided with carbonization rice husk, it is to avoid molten steel surface coverture crusts.
Beneficial effects of the present invention are:
The present invention is effectively reduced tundish dissolved aluminum scaling loss, makes the control of tundish dissolved aluminum scaling loss in below 19ppm, so that pole It is big to improve Molten Steel Cleanliness, improve slab quality.
Embodiment
Below by taking 60 tons of tundish as an example, the invention will be further described.
1st, tundish long nozzle Argon amount is controlled:Using around long nozzle liquid steel level without the maximum Argon amount risen as adjustment benchmark, By the control of long nozzle Argon amount in 0.12~0.36Nm3/h。
2nd, slag tapping volume of steel ladle is controlled:The latter stage automatic slag inspection system of input is poured into a mould, while manipulator is manually held, when certainly Dynamic slag inspection system alarm, or the slag surface that the vibrations of artificial feel manipulator are produced around mutation or long nozzle rise suddenly, Steel water tank sliding gate is closed immediately.
3rd, big tank operation is changed:
A. ladle is poured after panoramic table rotation, checks whether long nozzle inner chamber has residual steel, if residual steel needs to be cleaned, Especially long nozzle sealing table top (long nozzle and the small mouth of a river contact plane of ladle) can not be with the presence of residual steel, and ensures to seal table top Without breakage, if there is sealing table top breakage, then long nozzle must be changed;
B. ladle is dropped into long nozzle lower edge away from opening ladle slide plate again after molten steel surface 100mm.
C. it is whole to change ladle operation completion in 120s.
4th, coverture adds control:Casting machine, which is opened, pours the first tank molten steel, and coverture reaches that 35t is added in tundish weight, stopper Hole and thermometric thief hole are uniformly added into 400kg;Opened afterwards per tank steel and uniformly add 200kg each region is each after pouring.
5th, in normal casting process, the liquid level of molten steel should reach 1130mm in tundish, and long nozzle enters molten steel 600mm, And it is aided with carbonization rice husk (except ultra-low-carbon steel), it is to avoid molten steel surface coverture crusts.

Claims (1)

1. a kind of method for reducing tundish dissolved aluminum scaling loss, it is characterised in that:
(1) tundish long nozzle Argon amount is controlled:With liquid steel level around long nozzle without the maximum Argon risen Measure and control benchmark for adjustment, prevent air-breathing or molten steel surface from seething;
(2) slag tapping volume of steel ladle is controlled:Ladle pour into a mould latter stage, if manipulator vibrations produce mutation or Slag surface around long nozzle rises suddenly, and slide gate nozzle is closed immediately, and with the use of automatic slag inspection Device is looked into, ladle slag is reduced;
(3) ladle key points for operation are changed:
A. ladle is poured after panoramic table rotation, checks whether long nozzle inner chamber has residual steel, if residual steel Need to be cleaned, especially long nozzle sealing table top is that long nozzle can not with the small mouth of a river contact plane of ladle With the presence of residual steel, and ensure that sealing table top, without breakage, if there is sealing table top breakage, then must be changed Long nozzle;
B. when next ladle reaches cast position, prepare that long nozzle is installed, it is ensured that the small mouth of a river position of ladle Put and aligned with above and below long nozzle position;
C. ladle is dropped into long nozzle lower edge away from opening ladle slide plate again after 90~105mm of molten steel surface, Molten steel gradually increases slide plate aperture after flowing down;
D. ensure that whole ladle of changing operates the completion in 150s;
(4) coverture adds control:Casting machine, which is opened, pours the first tank molten steel, and coverture reaches 35t in tundish weight More than add, addition be ensure molten steel surface without it is exposed be principle, pouring area, stopper hole and thermometric sampling Hole is uniformly added into 300~500kg;Opened afterwards per tank steel and uniformly add 180~200kg each region is each after pouring;
(5) ladle is in casting process, and the liquid level of molten steel reaches more than 1000mm in tundish, Long nozzle enters below liquid steel level 300mm, and in addition to ultra-low-carbon steel, remaining steel grade is aided with carbonization rice husk, Molten steel surface coverture is avoided to crust.
CN201610057495.0A 2016-01-27 2016-01-27 A kind of method for reducing tundish dissolved aluminum scaling loss Pending CN107008890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610057495.0A CN107008890A (en) 2016-01-27 2016-01-27 A kind of method for reducing tundish dissolved aluminum scaling loss

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610057495.0A CN107008890A (en) 2016-01-27 2016-01-27 A kind of method for reducing tundish dissolved aluminum scaling loss

Publications (1)

Publication Number Publication Date
CN107008890A true CN107008890A (en) 2017-08-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610057495.0A Pending CN107008890A (en) 2016-01-27 2016-01-27 A kind of method for reducing tundish dissolved aluminum scaling loss

Country Status (1)

Country Link
CN (1) CN107008890A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107685140A (en) * 2017-09-08 2018-02-13 河钢股份有限公司承德分公司 A kind of method for reducing tundish covering flux consumption

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53130235A (en) * 1977-04-20 1978-11-14 Foseco Trading Ag Protector for slide gate
CN1400317A (en) * 2002-09-04 2003-03-05 钢铁研究总院 Method for treating and controlling acid-soluble aluminium in steel outside molten steel furnace
CN102397998A (en) * 2010-09-08 2012-04-04 鞍钢股份有限公司 Method for reducing secondary oxidation of molten steel
CN102586546A (en) * 2012-03-05 2012-07-18 吉林建龙钢铁有限责任公司 Process for preparing low-carbon low-silicon-aluminium killed steel
CN103469050A (en) * 2013-09-22 2013-12-25 中天钢铁集团有限公司 Aluminum-containing cold forging steel smelting process
CN103639383A (en) * 2013-11-29 2014-03-19 攀钢集团研究院有限公司 Pre-melting-type tundish covering agent and aluminum killed steel continuous casting method
JP2014109056A (en) * 2012-11-30 2014-06-12 Nippon Steel & Sumitomo Metal High strength steel sheet excellent in extension flange property and bendability, method for smelting molten steel for the steel sheet

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53130235A (en) * 1977-04-20 1978-11-14 Foseco Trading Ag Protector for slide gate
CN1400317A (en) * 2002-09-04 2003-03-05 钢铁研究总院 Method for treating and controlling acid-soluble aluminium in steel outside molten steel furnace
CN102397998A (en) * 2010-09-08 2012-04-04 鞍钢股份有限公司 Method for reducing secondary oxidation of molten steel
CN102586546A (en) * 2012-03-05 2012-07-18 吉林建龙钢铁有限责任公司 Process for preparing low-carbon low-silicon-aluminium killed steel
JP2014109056A (en) * 2012-11-30 2014-06-12 Nippon Steel & Sumitomo Metal High strength steel sheet excellent in extension flange property and bendability, method for smelting molten steel for the steel sheet
CN103469050A (en) * 2013-09-22 2013-12-25 中天钢铁集团有限公司 Aluminum-containing cold forging steel smelting process
CN103639383A (en) * 2013-11-29 2014-03-19 攀钢集团研究院有限公司 Pre-melting-type tundish covering agent and aluminum killed steel continuous casting method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107685140A (en) * 2017-09-08 2018-02-13 河钢股份有限公司承德分公司 A kind of method for reducing tundish covering flux consumption

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Application publication date: 20170804

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