CN102312047A - Cored wire for modifying and removing foreign materials in container filled with steel - Google Patents
Cored wire for modifying and removing foreign materials in container filled with steel Download PDFInfo
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- CN102312047A CN102312047A CN201110304253A CN201110304253A CN102312047A CN 102312047 A CN102312047 A CN 102312047A CN 201110304253 A CN201110304253 A CN 201110304253A CN 201110304253 A CN201110304253 A CN 201110304253A CN 102312047 A CN102312047 A CN 102312047A
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- cored
- wire
- steel
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- molten steel
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Abstract
The present invention discloses a cored wire for modifying and removing foreign materials in a container filled with steel. The wire core components of the cored wire comprise, by mass, 20-90% of CaO, 9-45% of Al2O3 and 1-35% of CaF. With the cored wire, the formations, the sizes and the quantity distributions of the foreign materials in the molten steel can be stabilized; the foreign materials in the molten steel can be effectively removed; the smelting cost can be reduced; the purity of the molten steel can be improved; the traditional calcium treatment of the aluminum-killed steel can be replaced.
Description
Technical field
The present invention relates to make steel used cored-wire; Be mainly used in refining, the casting process of aluminium killed steel and silicon aluminium killed steel; This cored-wire can carry out sex change and then remove fine foreign matter inclusion in the melted steel container, can solve various aluminium killed steels and silicon aluminium killed steel wadding stream, improve inclusion morphology also minimizing be mingled with quantity.
Background technology
In continuous casting process, immersion water gap for continuously casting has control tundish to mold molten steel IR and molten steel in mold mobile function, for stable operation and guarantee that quality plays important effect.This submerged nozzle inwall will cause phenomenon such as molten steel bias current and molten steel in mold liquid fluctuating in the mouth of a river if adhere to aluminum oxide, and slab quality is worsened, but also can hinder the propelling of many stoves continuous casting.
Inclusion is main relevant with the quantity and the form of inclusion to the harm of steel, improves steel quality, and primary is the quantity and the form of control inclusion.In order to prevent aluminum oxide attached on the submerged nozzle inwall, the method that generally adopts in the industry is to adopt the anti-blocking mouth of a river and molten steel is carried out the calcium processing, promptly through in molten steel, adding calcium, with Al
2O
3Being mingled with sex change is 12 CaO7Al
2O
3Because 12 CaO7Al
2O
3Fusing point is low, in molten steel, is in a liquid state, and therefore can effectively alleviate nozzle clogging, with the adding of calcium, in process of setting, can avoid the MnS of strip to be mingled with generation simultaneously, and generates globular CaS, has reduced the anisotropy of steel.But in production application,, make that yield is low when toward steel in, adding calcium, and be subject to the influence of factors such as sulphur in deoxidation of molten steel, slag oxidisability and the steel that the yield that makes calcium is instability extremely because the density of calcium is low, vp is big, chemically reactive is high.Therefore cause in the steel calcium contents on the low side or higher, thereby cause cost to increase.In addition; Inclusion major part in the molten steel is removed through the buoyancy come-up, still, in sequence casting production, only depends on nature come-up efficient very low; Can't satisfy production requirement, therefore usually adopt ladle bottom blowing stirring, tundish flow field to optimize the absorption of satisfying inclusion and float.Big in addition bag is poured into a mould methods such as omnidistance Argon, stable middle bag liquid level can avoid the molten steel secondary oxidation to a certain extent, but big production mainly is that large inclusions is controlled.So be mingled with the supplementary set agent to remove the tiny problem that is mingled be one of current metallurgy industry cutting edge technology through novel.
Summary of the invention
To the above-mentioned deficiency that prior art exists, the present invention aims to provide the cored-wire of formation, size and the distributed number of inclusion in the stable control of a kind of ability molten steel, and this cored-wire can effectively be removed the inclusion in the molten steel.
Technical scheme of the present invention is achieved in that a kind of cored-wire to inclusion modification in the melted steel container and removal, includes CaO, Al in the core component of this cored-wire
2O
3And CaF
2, the quality percentage composition of each component in core is: CaO-20 ~ 90%; Al
2O
3-9 ~ 45 %; CaF
2-1 ~ 35 %.
Also comprise SiO in the core component of this cored-wire
2, SiO
2Quality percentage composition in core is less than 35%.
Also comprise MgO in the core component of this cored-wire, the quality percentage composition of MgO in core is less than 8%.
Also comprise Ca in the core component of this cored-wire, the quality percentage composition of Ca in core is less than 30%.
Also comprise Fe in the core component of this cored-wire, the quality percentage composition of Fe in core is less than 20%.
Compare with prior art, the present invention has following beneficial effect:
This cored-wire can make the gasification of ground-slag small-particle; By the disperse bubble absorption in ladle or the middle bag; It is long-pending to increase reaction interface, makes and the collision probability height of silicon oxide, aluminum oxide that it is fast that tiny slag drips forming core simultaneously; Capture, adsorb the small ability that is mingled with and strengthen, also can effectively remove the inclusion in the molten steel.
This cored-wire is except adding in LF, CAS, VD/VOD, RH refining process; And can be through the feeding of continuous casting installation for casting such as tundish; Technological operation is easy, and floor space is little, can make the fine foreign matter distortion fast, be polymerized to large-scale lower melting point inclusion floating removal; Can reduce the slag former consumption, need not or feed calcium line less, shorten the soft blow time, satisfy the specification of quality of molten steel.
In a word, this cored-wire can reduce that smelting cost is low, the purity that improves molten steel and the calcium that replaces aluminium killed steel on the traditional sense handles.In aluminium killed steel, silicon aluminium killed steel practical application, can obtain positive effect, have great economic worth.Application shows, form, size and the quantity of this cored-wire may command nonmetallic inclusionsin steel can be with the Al in the strand
2O
3Control to below 0.002%, the total amount of inclusion is reduced to below 0.003%, and T [O] controls to 5～20ppm.
Embodiment
At least include CaO, Al in the core component of cored-wire of the present invention
2O
3And CaF
2, the quality percentage composition of each component in core is respectively: CaO-20 ~ 90%; Al
2O
3-9 ~ 45 %; CaF
2-1 ~ 35 %.
Can also comprise SiO in the core component of this cored-wire
2, SiO
2Quality percentage composition in core is less than 35%.
Can also comprise MgO in the core component of this cored-wire, the quality percentage composition of MgO in core is less than 8%.
Can also comprise Ca in the core component of this cored-wire, the quality percentage composition of Ca in core is less than 30%.
Can also comprise Fe in the core component of this cored-wire, the quality percentage composition of Fe in core is less than 20%.
The granularity of above-mentioned each component is controlled to be 0.01mm ~ 4mm.
Above component is an effective constituent, and the raw material that actual processing is adopted is:
CaO-mainly adopt the combination product of passive lime, quicklime or quicklime and aluminum oxide, passive lime requires CaO >=90%;
SiO
2-mainly adopt the combination product of silicon-dioxide or silicon-dioxide and silicate;
Al
2O
3-mainly adopt the combination product of aluminum oxide or quicklime and aluminum oxide;
CaF
2-mainly adopt the compound of high purity fluorite or Calcium Fluoride (Fluorspan)>=95%;
The combination product of MgO-mainly adopt Natural manganese dioxide or aluminum oxide and Natural manganese dioxide, magnesiumcarbonate;
The premix compound powder that also can adopt the fluorite powder by 75% lime powder and 25% to constitute replaces above-mentioned CaO and CaF
2
The P of all raw materials, S are low as much as possible, avoid sneaking into tramp material, and size range is 0.01mm ~ 4mm.
The making of this cored-wire, use are introduced as follows:
At first getting the raw materials ready by said ratio, (each raw material granularity is 0.01mm～4mm), drop into and stir with batch mixing mixing time 0.5h～8h in the mixing equipment.Then mixed cored-wire core powder material oven dry is handled, 110 ℃～200 ℃ of storing temperatures, storing time is 0.5h～24h.To smoke the above-mentioned core powder that finishes at last and adopt bag core method commonly used, the cored-wire diameter of processing is Ф 9mm～16mm, and core powder content is at 100～400g/m.This cored-wire can used inside and outside ladle bottom blowing district, the Vakuumkammer or near the tundish turbulator, mainly through single hole or the feeding of porous wire feeder.
The present invention adopts the reaction generation agent of the fine particle of quicklime, aluminum oxide and other compounds as the compound large inclusions of lower melting point in the molten steel, and fluorite is as the flux of core powder.The primitive reaction principle is following:
Under the traditional technology condition, gone out steel, refining soft blow phase and vacuum cycle phase in converter, general argon gas stirring intensity a little less than, slag gold kinetic reaction condition is not abundant especially, is difficult to make tiny being mingled with in the steel to float to slag liquid two-phase interface on the freedom.Especially the quantity of slag is big, temperature is low, argon gas station pressure is not enough; Cause that slag blanket fusing is inhomogeneous, argon gas mixing effect difference the time; Need especially a kind ofly can to capture, the refining pre-melted slag of fine foreign matter in the absorption, polymerization molten steel; Form bunch crowd through the collision between the fine foreign matter, replace traditional deslagging process.Moreover, can the quick penetration slag blanket through the mode of feeding metal wire, get into steel liquid deoxidation and with molten steel in A1
2O
3Inclusion forms lower melting point 12 CaO7Al
2O
3, be easy to float in the ladle slag, do not influence composition in the steel, higher than the recovery rate of iron of general calcium treatment process, thus the calcium of cancellation refining process is handled.
The molten steel turnup is prone to a large amount of secondary oxidation products of formation during cast.The A1 that volume slag and oxidation produce
2O
3The quantity of inclusion is many, size is bigger than normal, and molten steel is short in the tundish residence time, is not mingled with ascent time fully.Feed at tundish beam impact zone this moment and add low cost and be mingled with trapping agent, seem particularly important, can impel tiny secondary inclusion to grow up, be more conducive to it and accelerate to get rid of, shorten the eliminating time by the molten steel ballistic work.
Below be the practical application example of cored-wire of the present invention in liquid steel refining, big-and-middle bag casting process.
Embodiment 1
Domestic certain big section steel works, steel grade is a high-strength low-alloy steel, ladle gets into the LF station, the thermometric sampling, alloying after electrically heated or hello Al line finish, is turned bottom blowing tolerance down, feeds this cored-wire, and heart yearn basic composition is: CaO:50%, SiO
2: 6%, Ca:7%, CaF
2: 15%, Al
2O
3: 10%, MgO:5%, Fe:7%, core line diameter is Ф 11mm, wire-feeding velocity is controlled at 1～4m/s, feed quantity 900～1100m/ stove, line feeding finished the continued Argon more than 3 minutes.Through chemical analysis, before the line feeding in the steel maximum w (S) content be 0.004%, after the line feeding in the steel w (S) content be reduced to 0.001%.T in the strand [O] is that 40ppm is reduced to 13 ~ 17ppm by MV, adopts 500 power microscopes to analyze inclusion pattern and quantity in the strand, and the disperse in steel of each type impurity distributes, and is between 0 ~ 1.0 grade.
Embodiment 2
Domestic certain big section steel works, steel grade is the high strength container steel, ladle gets into the LF station, the thermometric sampling, alloying after electrically heated or hello Al line finish, weakens bottom blowing tolerance, feeds this cored-wire, and heart yearn basic composition is: CaO:40%, SiO
2: 15%, Ca:8%, CaF
2: 7%, CaOAl
2O
3: 25%, MgO:5%, core line diameter is Ф 10mm, wire-feeding velocity is controlled at 1～4m/s, feed quantity 700～1000m/ stove, line feeding finished the continued Argon more than 3 minutes.The same heart yearn of feeding in the continuous casting tundish turbulator, the whole process protection cast.Through the electronic microscope photos of mouth of a river dung, under the normal teeming temperature of this steel grade, has only a spot of pure Al basically
2O
3Inclusion is calcareous oxidation duplex impurity mostly, and proving can be with dystectic Al
2O
3Sex change is low-melting calcium aluminate (12 CaO7Al
2O
3), and positive effect is arranged.
Embodiment 3
Domestic certain big section steel works, steel grade is the Q450 weathering steel, ladle gets into the LF station, the thermometric sampling, alloying after electrically heated or hello Al line finish, weakens bottom blowing tolerance, feeds this cored-wire, and heart yearn basic composition is: CaO:25%, SiO
2: 25%, Ca:15%, CaF
2: 14%, 3CaOAl
2O
3: 10%, MgO:6%, Fe:5%, core line diameter is Ф 13mm, wire-feeding velocity is controlled at 1～4m/s, feed quantity 1000～1200m/ stove, line feeding finished the continued Argon more than 3 minutes.Through chemical analysis, before the line feeding in the steel maximum w (S) content be respectively 0.0078%, after the line feeding in the steel w (S) content directly reduce by 0.0052%.T in the strand [O] is that 34.0ppm is reduced to 14.8ppm by MV, adopts 500 power microscopes to analyze inclusion pattern and quantity in the strand, finds Al in the strand
2O
3Inclusion MV reduces to 0.0016% by 0.0024%, and the rank of each type impurity is very low, is 0.5 grade, and is evenly distributed.
Embodiment 4
Domestic certain big section steel works, steel grade is the 08Al cold heading steel, ladle gets into the LF station, the thermometric sampling, alloying after electrically heated or hello Al line finish, weakens bottom blowing tolerance, feeds this cored-wire, and heart yearn basic composition is: CaO:20%, SiO
2: 35%, Ca:20%, CaF
2: 5%, Al
2O
3: 13%, MgO:7%, core line diameter is Ф 12mm, wire-feeding velocity is controlled at 1～4m/s, feed quantity 800～1000m/ stove, line feeding finished the continued Argon more than 3 minutes.Through the scanning electron microscope analysis of middle water-coating port dung, in this steel, only find to have a spot of CaS and pure Al
2O
3Inclusion is the oxidation duplex impurity of calcic aluminium mostly, proves to be low-melting gehlenite or aluminum calcium salt with dystectic pure-oxide sex change, and effect is remarkable in practical application.
Claims (9)
1. the cored-wire to inclusion modification in the melted steel container and removal is characterized in that: include CaO, Al in the core component of this cored-wire
2O
3And CaF
2, the quality percentage composition of each component in core is: CaO-20 ~ 90%; Al
2O
3-9 ~ 45 %; CaF
2-1 ~ 35 %.
2. cored-wire according to claim 1 is characterized in that: also comprise SiO in the core component of this cored-wire
2, SiO
2Quality percentage composition in core is less than 35%.
3. cored-wire according to claim 1 and 2 is characterized in that: also comprise MgO in the core component of this cored-wire, the quality percentage composition of MgO in core is less than 8%.
4. cored-wire according to claim 1 and 2 is characterized in that: also comprise Ca in the core component of this cored-wire, the quality percentage composition of Ca in core is less than 30%.
5. cored-wire according to claim 3 is characterized in that: also comprise Ca in the core component of this cored-wire, the quality percentage composition of Ca in core is less than 30%.
6. cored-wire according to claim 3 is characterized in that: also comprise Fe in the core component of this cored-wire, the quality percentage composition of Fe in core is less than 20%.
7. cored-wire according to claim 5 is characterized in that: also comprise Fe in the core component of this cored-wire, the quality percentage composition of Fe in core is less than 20%.
8. cored-wire according to claim 7 is characterized in that: the granularity of said each component is 0.01mm ~ 4mm.
9. cored-wire according to claim 1 is characterized in that: said cored-wire diameter is Ф 9 mm ~ 16mm, and every meter quality of core is 100 ~ 400g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110304253 CN102312047B (en) | 2011-10-10 | 2011-10-10 | Cored wire for modifying and removing inclusions in container filled with steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110304253 CN102312047B (en) | 2011-10-10 | 2011-10-10 | Cored wire for modifying and removing inclusions in container filled with steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102312047A true CN102312047A (en) | 2012-01-11 |
| CN102312047B CN102312047B (en) | 2013-02-20 |
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ID=45425614
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110304253 Expired - Fee Related CN102312047B (en) | 2011-10-10 | 2011-10-10 | Cored wire for modifying and removing inclusions in container filled with steel |
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|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177221A (en) * | 2014-06-23 | 2015-12-23 | 鞍钢股份有限公司 | Method for removing aluminum oxide inclusion in molten steel in refining process |
| CN106244762A (en) * | 2016-07-28 | 2016-12-21 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of control method of IF steel clamp foreign material |
| CN108504822A (en) * | 2018-05-15 | 2018-09-07 | 首钢集团有限公司 | A kind of method of small particle aluminate pattern in control ultra-low-carbon steel |
| CN111321276A (en) * | 2020-04-10 | 2020-06-23 | 北京首钢股份有限公司 | Method for improving yield of magnesium element in molten steel |
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| JPS60258406A (en) * | 1984-06-06 | 1985-12-20 | Nippon Steel Corp | Synthetic flux for molten steel |
| CN101235428A (en) * | 2008-02-03 | 2008-08-06 | 马长慧 | Calcium silicon iron core-spun yarn core layer composition |
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2011
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Patent Citations (3)
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| JPS60258406A (en) * | 1984-06-06 | 1985-12-20 | Nippon Steel Corp | Synthetic flux for molten steel |
| CN101235428A (en) * | 2008-02-03 | 2008-08-06 | 马长慧 | Calcium silicon iron core-spun yarn core layer composition |
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|---|
| 李明光等: "新型复合钙包芯线的开发与生产应用", 《炼钢》, vol. 26, no. 6, 31 December 2010 (2010-12-31) * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177221A (en) * | 2014-06-23 | 2015-12-23 | 鞍钢股份有限公司 | Method for removing aluminum oxide inclusion in molten steel in refining process |
| CN106244762A (en) * | 2016-07-28 | 2016-12-21 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of control method of IF steel clamp foreign material |
| CN106244762B (en) * | 2016-07-28 | 2018-08-14 | 成都先进金属材料产业技术研究院有限公司 | A kind of control method of IF steel clamps sundries |
| CN108504822A (en) * | 2018-05-15 | 2018-09-07 | 首钢集团有限公司 | A kind of method of small particle aluminate pattern in control ultra-low-carbon steel |
| CN108504822B (en) * | 2018-05-15 | 2020-03-27 | 首钢集团有限公司 | Method for controlling shape of inclusions in alumina with medium and small particle sizes in ultra-low carbon steel |
| CN111321276A (en) * | 2020-04-10 | 2020-06-23 | 北京首钢股份有限公司 | Method for improving yield of magnesium element in molten steel |
| CN111321276B (en) * | 2020-04-10 | 2021-12-03 | 北京首钢股份有限公司 | Method for improving yield of magnesium element in molten steel |
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|---|---|
| CN102312047B (en) | 2013-02-20 |
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Application publication date: 20120111 Assignee: MA'ANSHAN XINGDA METALLURGICAL NEW MATERIAL CO., LTD. Assignor: Chongqing University Contract record no.: 2015340000005 Denomination of invention: Cored wire for modifying and removing foreign materials in container filled with steel Granted publication date: 20130220 License type: Exclusive License Record date: 20150205 |
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Granted publication date: 20130220 Termination date: 20171010 |
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