CN101391288A - Pouring box covering agent for smelting low-carbon high-cleanliness steel - Google Patents

Pouring box covering agent for smelting low-carbon high-cleanliness steel Download PDF

Info

Publication number
CN101391288A
CN101391288A CNA2008102260188A CN200810226018A CN101391288A CN 101391288 A CN101391288 A CN 101391288A CN A2008102260188 A CNA2008102260188 A CN A2008102260188A CN 200810226018 A CN200810226018 A CN 200810226018A CN 101391288 A CN101391288 A CN 101391288A
Authority
CN
China
Prior art keywords
percent
steel
carbon
low
covering flux
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.)
Granted
Application number
CNA2008102260188A
Other languages
Chinese (zh)
Other versions
CN101391288B (en
Inventor
刘金刚
朱志远
王文军
李景光
郝宁
王臻明
王彦锋
麻庆申
姜中行
李战军
王玉龙
沈峰
关春阳
谢翠红
吕延春
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.)
Shougang Group Co Ltd
Original Assignee
Shougang Corp
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 Shougang Corp filed Critical Shougang Corp
Priority to CN2008102260188A priority Critical patent/CN101391288B/en
Publication of CN101391288A publication Critical patent/CN101391288A/en
Application granted granted Critical
Publication of CN101391288B publication Critical patent/CN101391288B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Disclosed is a special tundish covering flux for low-carbon and high-cleanliness steel smelting, which belongs to the steel-making continuous casting technique field. The covering flux has the compositions, in weight percentage: C: 1.5 to 6 percent, CaO: 45 to 55 percent, Al2O3: 30 to 32 percent, SiO2: 5 to 7 percent, TiO2: 2.5 to 3.2, MgO: 1 to 2 percent, FeO: 0.9 to 1.2 percent, F: 0.7 to 1.0 percent, K2O: 0.20 to 0.25 percent, Na2O: 0.31 to 0.35 percent, MnO: 0.08 to 0.15 percent, and the like. The invention has the advantages that: the carburization in the continuous casting process is controlled below 0.005 percent; the inclusion content in the molten steel is effectively reduced; and the disappearance of incrustation in the use process can effectively prevent the secondary oxidation.

Description

A kind of smelting low-carbon high-cleanliness steel tundish covering flux
Technical field
The invention belongs to the steel-making continuous casting technical field, a kind of smelting low-carbon high-cleanliness steel tundish covering flux particularly is provided, the special-purpose high basicity tundish covering flux of low-carbon (LC) prevents molten steel recarburization, secondary oxidation and strengthens the field trash adsorption capacity when being applicable to the casting of low-carbon and low-alloy cleanness steel.
Background technology
The carbon content that can't further carry out producing the technology of decarburization mild steel after some are subjected to various condition restriction converter tappings must be carried out strictness in each operation and be controlled, therefore as molten steel last container of process, molten steel prevents that carburetting is related to the carbon content control of the overall situation in the tundish, simultaneously owing to can only rely on the converter decarburization in the whole smelting procedure, and in low-carbon (LC) when tapping, is because liquid steel temperature is higher, so converter lining corrodes serious, therefore must prevent the tundish molten steel recarburization, to reduce the burden of converter decarburization as far as possible.
Molten steel oxidation is stronger during the smelting low carbon steel for low-carbon high-cleanliness steel water, it is more to form field trash in the steel, the cleanliness factor that will fully remove field trash raising molten steel necessarily requires each stage slag all to have very strong dross inclusion adsorption ability, cinder inclusion influenced the key factor of steel field trash qualification rate especially in the middle of tundish covering flux was formed to the adsorption capacity of field trash, though and the used high basicity coverture of low-carbon (LC) can effectively adsorb steel inclusion but crust easily usually, thereby can cause the secondary oxidation of molten steel to reduce the molten steel cleanliness factor like this.Therefore, reach qualified level, developed the high basicity tundish covering flux of the used low-carbon (LC) of high clean steel in order to guarantee low-carbon high-cleanliness steel finished product carbon and inclusion content.
Summary of the invention
The present invention aims to provide a kind of smelting low-carbon high-cleanliness steel tundish covering flux, solved that carbon and field trash exceed standard and common coverture easily crust cause the problem of secondary oxidation.
It is C:1.5～6% that the high basicity tundish covering flux of low-carbon (LC) of the present invention is formed mass percent, CaO:45～55%, Al 2O 3: 30～32%, SiO 2: 5～7%, TiO 2: 2.5～3.2%, MgO:1～2%, FeO:0.9～1.2%, F:0.7～1.0%, K 2O:0.20～0.25%, Na 2O:0.31～0.35%, MnO:0.08～0.15% etc.
Advantage of the present invention and effect: 1. control casting process carburetting less than 0.005%; 2. effectively reduce inclusion content in the molten steel, improve final products field trash qualification rate; 3. use is not crusted and can effectively be prevented secondary oxidation.
The specific embodiment
Tundish covering flux adding method is identical with other kinds coverture adding method, forbids when protective casing or sleeve pipe do not immerse the molten steel face to add coverture to the tundish impact zone not adding.Addition is watered time first Baogang's water coverture and is added by the 2kg/t steel, and second Baogang's water can reduce to the 1kg/t steel, can reduce to the 0.75kg/t steel since three guarantees, and addition is a principle not reveal the molten steel face.
Embodiment 1
In pipe line steel X80 smelts, use this coverture (composition is as shown in table 1) to prevent that carburetting and secondary oxidation effect are as shown in table 2, prevent the carburetting effect: average carburetting 0.002%, maximum 0.005%, minimum is 0%; Prevent the secondary oxidation effect: it is 0.004% that average aluminium decreases, and is 0.009% to the maximum, and minimum is 0%.
Table 1 tundish covering flux composition percentage by weight, %
Sequence number TFe FeO CaO SiO 2 Al 2O 3 MgO MnO P 2O 5 K 2O Na 2O TiO 2 F C S
1 0.891 1.104 48.817 5.975 31.328 1.295 0.106 0.020 0.223 0.329 3.194 0.817 5.572 0.329
2 1.320 1.132 48.695 5.847 31.133 1.278 0.105 0.021 0.231 0.356 3.144 0.954 5.459 0.325
3 1.482 1.175 47.778 6.224 31.584 1.270 0.104 0.022 0.243 0.360 2.953 0.942 5.546 0.318
4 1.559 1.071 48.330 6.312 31.166 1.252 0.104 0.022 0.244 0.350 2.960 0.721 5.590 0.318
5 1.383 0.967 49.792 5.408 31.645 1.394 0.104 0.021 0.208 0.333 3.068 0.915 4.493 0.270
6 1.044 1.076 50.160 5.680 31.362 1.343 0.128 0.021 0.224 0.330 3.133 0.789 4.444 0.266
Table 2 X80 uses coverture effect percentage by weight, %
Figure A200810226018D00041
Embodiment 2
Use this coverture to significantly improve the qualification rate of field trash in pipe line steel X70 smelts, one to water time 8 stoves (100 tons of molten steel of every stove) field trash qualification rate be 100%, uses that qualification rate is 88.5%～92.8% before this coverture.

Claims (1)

1, a kind of smelting low-carbon high-cleanliness steel tundish covering flux is characterized in that, it is C:1.5～6% that coverture is formed mass percent, CaO:45～55%, Al 2O 3: 30～32%, SiO 2: 5～7%, TiO 2: 2.5～3.2, MgO:1～2%, FeO:0.9～1.2%, F:0.7～1.0%, K 2O:0.20～0.25%, Na 2O:0.31～0.35%, MnO:0.08～0.15%.
CN2008102260188A 2008-11-04 2008-11-04 Tundish covering agent for smelting low-carbon high-cleanliness steel Active CN101391288B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008102260188A CN101391288B (en) 2008-11-04 2008-11-04 Tundish covering agent for smelting low-carbon high-cleanliness steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2008102260188A CN101391288B (en) 2008-11-04 2008-11-04 Tundish covering agent for smelting low-carbon high-cleanliness steel

Publications (2)

Publication Number Publication Date
CN101391288A true CN101391288A (en) 2009-03-25
CN101391288B CN101391288B (en) 2010-07-28

Family

ID=40491907

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2008102260188A Active CN101391288B (en) 2008-11-04 2008-11-04 Tundish covering agent for smelting low-carbon high-cleanliness steel

Country Status (1)

Country Link
CN (1) CN101391288B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101745615A (en) * 2010-01-21 2010-06-23 河南省西保冶材集团有限公司 Function protecting material of continuous casting crystallizer for large square low-carbon steel
CN102399938A (en) * 2011-11-29 2012-04-04 东北大学 Inclusion control method for rod and wire alloy steel
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
CN104017937A (en) * 2013-03-02 2014-09-03 太原钢铁(集团)有限公司 Micro carbon alkaline particle covering agent and production method thereof
CN105127385A (en) * 2015-09-06 2015-12-09 南京钢铁股份有限公司 Synthetic slag for tundish covering agent
CN111500919A (en) * 2020-05-29 2020-08-07 攀钢集团攀枝花钢铁研究院有限公司 Production method of high-cleanliness high-titanium low-carbon steel

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101745615A (en) * 2010-01-21 2010-06-23 河南省西保冶材集团有限公司 Function protecting material of continuous casting crystallizer for large square low-carbon steel
CN101745615B (en) * 2010-01-21 2014-09-10 河南省西保冶材集团有限公司 Function protecting material of continuous casting crystallizer for large square low-carbon steel
CN102399938A (en) * 2011-11-29 2012-04-04 东北大学 Inclusion control method for rod and wire alloy steel
CN104017937A (en) * 2013-03-02 2014-09-03 太原钢铁(集团)有限公司 Micro carbon alkaline particle covering agent and production method thereof
CN104017937B (en) * 2013-03-02 2015-10-28 太原钢铁(集团)有限公司 A kind of micro-carbon alkali grain insulating covering agent and production method thereof
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
CN103639383B (en) * 2013-11-29 2015-10-21 攀钢集团研究院有限公司 The continuous cast method of pre-melted type tundish covering flux and aluminum killed steel
CN105127385A (en) * 2015-09-06 2015-12-09 南京钢铁股份有限公司 Synthetic slag for tundish covering agent
CN111500919A (en) * 2020-05-29 2020-08-07 攀钢集团攀枝花钢铁研究院有限公司 Production method of high-cleanliness high-titanium low-carbon steel
CN111500919B (en) * 2020-05-29 2021-12-14 攀钢集团攀枝花钢铁研究院有限公司 Production method of high-cleanliness high-titanium low-carbon steel

Also Published As

Publication number Publication date
CN101391288B (en) 2010-07-28

Similar Documents

Publication Publication Date Title
CN101391288B (en) Tundish covering agent for smelting low-carbon high-cleanliness steel
CN102212640B (en) Convertor steelmaking method capable of reducing slag quantity
CN103374642B (en) De-oxidation modifying agent for steel ladle top slag
CN101519710B (en) Method for controlling non-metallic impurities in structural alloy steel
CN100351401C (en) Molten slag gasification dephosphorization method during converter splash protection process
CN101492758B (en) Method for controlling non-metallic inclusion in pipeline steel
CN104858382B (en) A kind of tundish covering flux and its application
CN100999043A (en) Submerged arc welding flux material used for high grade pipe line steel
CN101121987A (en) Smelting method for titanium-containing austenitic stainless steel
CN105506226B (en) A kind of method that hot metal desiliconization, pre- decarburization and pre- dephosphorization are carried out in hot-metal bottle
CN111644582B (en) Tundish covering agent for titanium-containing steel and preparation method and application thereof
CN101717842A (en) Method for dephosphorization and desulphurization in process of steel production in induction furnace
CN101824506B (en) Revolving furnace slag pressing agent and revolving furnace slag pressing method
JP5251360B2 (en) Manufacturing method of clean steel by ladle refining method
CN102041355B (en) Ladle slag modifier for stainless steel refining process
CN101301679B (en) Tundish covering agent special for smelting pipeline steel
CN108642224B (en) Method for modifying converter slag by using blast furnace slag and molten iron
CN103952508B (en) A kind of tap before add the operational approach of modification agent
JPWO2012133795A1 (en) Environmental protection molten steel desulfurization flux
CN100354435C (en) Method for moten iron desulfurization using slag of desulfurized molten iron
CN104294008B (en) Iron melt desulfurizing agent and application
KR20150074800A (en) Fluorite substitute for fluorite free refining
CN107557518A (en) A kind of dephosphorization converter furnace bottom maintaining method
Jung Thermodynamic modeling of gas solubility in molten slags (II)—water
CN101886156B (en) Steelmaking method of ladle refining furnace

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee after: Shougang Group Co. Ltd.

Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee before: Capital Iron & Steel General Company

CP01 Change in the name or title of a patent holder