CN1778974A - Deoxidization of calcium-silicon barium for smelting 82B steel - Google Patents

Deoxidization of calcium-silicon barium for smelting 82B steel Download PDF

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Publication number
CN1778974A
CN1778974A CN 200410155448 CN200410155448A CN1778974A CN 1778974 A CN1778974 A CN 1778974A CN 200410155448 CN200410155448 CN 200410155448 CN 200410155448 A CN200410155448 A CN 200410155448A CN 1778974 A CN1778974 A CN 1778974A
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China
Prior art keywords
steel
alloy
molten steel
calcium
tapping
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CN 200410155448
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Chinese (zh)
Inventor
章军
李本海
李永东
王全礼
曾立
王坚
朱殷翔
丰国庆
李飞
王彦锋
周德
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Shougang Corp
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Shougang Corp
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Priority to CN 200410155448 priority Critical patent/CN1778974A/en
Publication of CN1778974A publication Critical patent/CN1778974A/en
Pending legal-status Critical Current

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Abstract

A deoxidizating technique by Si-Ba-Ca alloy in 82B steel-making which includes adding deoxidizing agent such as Al in tapping process. Its characters are as follows: adding Si-Ba-Ca alloy as deoxidizing agent to molten steel when tapping from converter(weight percentage of each component is Si 52-65, Ca>=14, Ba>=14, Al<=2, S<=0.15, P<=0.05; granularity 10-50mm; specific density 3.2g/cm3). The deoxidizing agent is suggested to add into ladle with other alloy when the tapping percentage is in between 1/4 and 1/3. There are no Ba inclusion in finished steel and content of large-grained inclusion in finished steel decreased evidently because Ba's great atomic radius made itself easier oxidated so that almost all the Ba were turned into slag. This technique could control the content of AlT<= 0.002% in finished steel so as to prevent reoxidation of molten steel in continuous pouring process effectively and improve cleanliness of molten steel and increase numbers of pouring convertors. It's highly suitable for pouring light section continuous casting billet and 82B steel for steel strand that requires superheat degree of molten steel more strictly.

Description

The deoxidization of calcium-silicon barium of smelting 82 B steel
Affiliated field
The invention belongs to field of steel-making, mainly be applicable to the little square billet of continuous casting 130mm, guarantee to smelt under low overheat, the stably manufactured condition method of deoxidation of steel strand with 82B steel converter molten steel.
Background technology
Steel strand are low with the inclusion content of the deep processing performance of 82B wire rod and this steel grade of service requirements in great key project, total oxygen content is not more than 30ppm, inclusion is yielding and particle size less than 6 μ m, must strict control nonmetallic inclusionsin steel aluminium sesquioxide content.
The purpose of deoxidation operation is in order to reduce total oxygen content in the steel, and steel mill smelts steel strand and Al-Fe arranged, Si-Ca-Ba-Al, Si-Ca with the reductor of the normal employing of steel 82B both at home and abroad at present.For pouring into a mould the high 82B continuously cast bloom of light section C content, because molten steel temperature in tundish hangs down 1486-1499 ℃, if employing contains the Al reductor, the as easy as rolling off a log mouth of a river cover eye that causes can not stably manufactured.
Barium has than calcium, density that magnesium is big, high boiling point, low vapour pressure and little solubleness.Be liquid liquid with molten steel behind the adding molten steel and contact, be difficult for causing splash, this helps alloy fusing fully rapidly in ladle, reduces the scaling loss of alloy, improves recovery rate.SiBa forms free energy, and SiCa forms free energy and is-88.5KJ/mol, and silicon combines with bigger strong bond with barium, and the solubleness of barium in molten steel is increased, and helps strengthening the treatment effect of barium alloy.Flame and splash that the SiCaBa alloy adds the ladle generation all add fashionable situation less than the SiCa alloy, and barium can significantly reduce the vapour pressure of Ca.
Studies show that the baric composite deoxidant is handled molten steel, can reduce the inclusion fusing point, improves the shape and size of inclusion, make the inclusion disperse and even, deoxidation products is easy to come-up, improves the processing characteristics of steel.Reduce the aluminium consumption simultaneously, stabilizing continuous casting technology.
Summary of the invention
The object of the present invention is to provide a kind of method of deoxidation of smelting steel strand with the converter molten steel of 82B steel.The shape and size total oxygen content that the inclusion of generation is fully floated reduce inclusion content of steel and improve inclusion is not more than 30ppm, inclusion is yielding and particle less than 6 μ m, can rationally control Al content in the steel again, guarantee under low overheat Δ T≤32 ℃ of conditions, to pour into a mould 130mm 2The direct motion of light section 82B continuously cast bloom technology effectively prevents mouth of a river cover eye, improves to connect and waters the stove number, reduces production costs.
At above-mentioned purpose, the invention provides a kind of deoxidization of calcium-silicon barium of smelting steel strand with the 82B steel, comprise that the tapping process interpolation contains the Al reductor, is characterized in that: in molten steel, add silico-calcium barium during converter tapping as reductor, concrete composition is weight percentage: Si, 52-65; Ca, 〉=14; Ba, 〉=14; Al ,≤2; S≤0.15; P ,≤0.05; Granularity is 10-50mm; Proportion 3.2g/cm 3, the time of adding silico-calcium barium reductor is: converter tapping amount 1/4 back together adds ladle with other alloy, and remains alloy to be added in 1/3 o'clock in tap and finish,
The add-on of silico-calcium barium reductor is the 2-3kg/t steel.
The invention has the beneficial effects as follows:
The Si-Ca-Ba reductor together adds ladle in converter tapping amount 1/4 back with other alloy, stir by strong molten steel, improve the dynamic conditions of deoxidation, and remain Si-Ca-Ba all to be added in 1/3 o'clock in tap and finish, make reductor can fully participate in the deoxygenation of molten steel.
Because 82B belongs to high carbon steel, the converter smelting endpoint molten steel oxidisability is not strong, be about 200-300PPM, under the steel-making temperature, Si-Ca-Ba reductor add-on just can reach running balance with the oxygen in the molten steel at the 2.5kg/t steel, the molten steel oxygen activity is controlled in the 10PPM after can making converter tapping, and uses that traditional to contain the aluminium deoxidizer effect suitable.
In addition, adopt this reductor after because the atomic radius of Ba is big, its oxidation rate is very fast, the Ba of adding has all entered slag basically, exists with forms such as BaO in slag after the deoxidation, and form inclusion hardly in Finished Steel, can effectively improve steel.
Present method can guarantee Al in the steel T≤ 0.002%, effectively the secondary oxidation of molten steel in the process waters in the company of preventing, improves the cleanliness factor of molten steel and connects and water the stove number, is highly suitable for pouring into a mould the high carbon steel that light section continuously cast bloom, molten steel overheat are had relatively high expectations.
Embodiment
Smelt steel strand with in the steel SWRH82B process, add silico-calcium barium reductor with steel stream when the 80t converter tapping, add-on is 200kg, its chemical ingredients following (%): Si, 55.1; Ca, 17.1; Ba, 15.8; Al, 1.07; S, 0.12; P, 0.019.1600-1630 ℃ of converter tapping temperature.
Adopt Si-Ca-Ba deoxidation 82B wire rod oxide inclusion situation
Heat (batch) number The oxide inclusion total amount, individual/mm 2 The inclusion distribution of sizes, % Be mingled with maximum particle diameter, μ m
≤5.89μm 5.89-15.06μm ≥15.06μm
2D3369 33.15 98.6 1.4 0 7.21
2E3197 26.70 94.8 5.2 0 11.79
2E3275 19.34 92.8 7.2 0 9.82
2D3397 47.88 97.0 2.5 0.5 18.34
2E3292 37.98 98.8 1.2 0 6.55
Adopt the Si-Ca-Ba alloy more to help floating foreign, the steel inclusion total amount is lower, and most inclusion sizes are less than 6 μ m.Electron probe microanalysis shows, does not find to contain the inclusion of Ba in steel.Whole steelmaking process is very well, and steel product ingredient and quality are uniform and stable.
Adopt Ca, Al in the Si-Ca-Ba deoxidized steel T, [O] content
Heat (batch) number [O],PPM Ca,PPM AlT,PPM
D3369 27 12 <20
2E3197 23 19 <20
2E3275 19 14 <20
2D3397 28 21 <20
2E3292 21 13 <20
The 82B wire rod that adopts this method to produce to account for total domestic demand 1/3 uses good.

Claims (2)

1. the deoxidization of calcium-silicon barium of a smelting 82 B steel comprises that tapping process adds and contains the Al reductor that it is characterized in that: add silico-calcium barium during converter tapping as reductor in molten steel, concrete composition is weight percentage: Si, 52-65; Ca, 〉=14; Ba, 〉=14; Al ,≤2; S≤0.15; P ,≤0.05; Granularity is 10-50mm; Proportion 3.2g/cm3, the time of adding silico-calcium barium reductor is: converter tapping amount 1/4 back together adds ladle with other alloy, and remains alloy to be added in 1/3 o'clock in tap and finish.
2. a kind of deoxidization of calcium-silicon barium of smelting steel strand with the 82B steel as claimed in claim 1, it is characterized in that: the add-on of silico-calcium barium reductor is the 2-3kg/t steel.
CN 200410155448 2004-11-17 2004-11-17 Deoxidization of calcium-silicon barium for smelting 82B steel Pending CN1778974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200410155448 CN1778974A (en) 2004-11-17 2004-11-17 Deoxidization of calcium-silicon barium for smelting 82B steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200410155448 CN1778974A (en) 2004-11-17 2004-11-17 Deoxidization of calcium-silicon barium for smelting 82B steel

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Publication Number Publication Date
CN1778974A true CN1778974A (en) 2006-05-31

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101892348A (en) * 2010-07-22 2010-11-24 新兴铸管股份有限公司 Molten steel calcium supplement
CN102277471A (en) * 2011-08-03 2011-12-14 攀钢集团成都钢钒有限公司 Manufacturing method of steel
CN105861774A (en) * 2015-01-23 2016-08-17 鞍钢股份有限公司 Casting method for lowering nodulation rate of aluminum steel tank for billet high-carbon steel
CN108842036A (en) * 2018-07-02 2018-11-20 新疆八钢铁股份有限公司 A kind of technique that barium element is used for low-carbon and low-silicon steel deoxidation as deoxidier
CN108998628A (en) * 2016-04-21 2018-12-14 日照宝华新材料有限公司 A kind of killed steel low cost deoxidization technique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101892348A (en) * 2010-07-22 2010-11-24 新兴铸管股份有限公司 Molten steel calcium supplement
CN102277471A (en) * 2011-08-03 2011-12-14 攀钢集团成都钢钒有限公司 Manufacturing method of steel
CN102277471B (en) * 2011-08-03 2013-09-11 攀钢集团成都钢钒有限公司 Manufacturing method of steel
CN105861774A (en) * 2015-01-23 2016-08-17 鞍钢股份有限公司 Casting method for lowering nodulation rate of aluminum steel tank for billet high-carbon steel
CN108998628A (en) * 2016-04-21 2018-12-14 日照宝华新材料有限公司 A kind of killed steel low cost deoxidization technique
CN108842036A (en) * 2018-07-02 2018-11-20 新疆八钢铁股份有限公司 A kind of technique that barium element is used for low-carbon and low-silicon steel deoxidation as deoxidier

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