CN101845535B - Method for improving nitrogen yield of ferrosilicon nitride - Google Patents
Method for improving nitrogen yield of ferrosilicon nitride Download PDFInfo
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- CN101845535B CN101845535B CN2010101834746A CN201010183474A CN101845535B CN 101845535 B CN101845535 B CN 101845535B CN 2010101834746 A CN2010101834746 A CN 2010101834746A CN 201010183474 A CN201010183474 A CN 201010183474A CN 101845535 B CN101845535 B CN 101845535B
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Abstract
The invention provides a method for improving the nitrogen yield of ferrosilicon nitride. Based on the steelmaking processes of molten iron pretreatment, converter blowing, RH vacuum treatment and continuous casting, a ferrosilicon nitride core-spun yarn is fed before converter tapping is finished or before refining, and the molten iron is stirred by using nitrogen or argon at the same time; the molten iron condition when the ferrosilicon nitride core-spun yarn is fed is that the oxygen activity is less than 50ppm; and the ferrosilicon nitride core-spun yarn consists of a wrapping and core powder; the core powder is prepared from the ferrosilicon nitride and has the granularity of less than or equal to 0.5mm, particles with the granularity of more than 0.5mm account for no more than 10 percent of all particles, and the diameter of the core-spun yarn is 9 to 16mm. Through the method, the nitrogen yield of the ferrosilicon nitride is improved to over 75 percent from below 30 percent, the fluctuation of the yield is small, and the repeatability is high; and the nitrogen content of the molten iron can be accurately controlled in the subsequent refining process.
Description
Affiliated field
The invention belongs to silicon steel smelting technology field.A kind of method that improves nitrogen element yield in the ferro-silicon nitride is provided.
Background technology
The nitrogen promoter of smelting the oriented silicon steel use mainly comprises ferro-silicon nitride, nitrogenize silicomanganese etc., and the manganese content of nitrogenize silicomanganese is higher, and the orientation steel grade of the part trade mark can not use the nitrogen pick-up of nitrogenize silicomanganese, and ferro-silicon nitride is widely used because of not receiving the steel grade restriction.Traditional adding mode is that block ferro-silicon nitride adds ladle with steel stream in tapping process, is characterized in convenient and simple for operation.But this method causes in the ferro-silicon nitride nitrogen element absorption rate low and unstable because of following reason.
1, the ferro-silicon nitride fusing point is high, can make good refractory materials, and is relatively poor with the wellability of molten steel, is difficult in molten steel, melt fast; Ferro-silicon nitride density is little, and the about 3.6g/cm3 of density is about the half the of molten steel density.Because of buoyancy is floated, block ferro-silicon nitride does not dissolve in molten steel because of there being the enough time, floats to slag;
The free oxygen level of molten steel is very high when 2, tapping, and at high temperature, the SiO2 solids manufacture thing layer that oxygen and ferro-silicon nitride reaction generate has stoped proceeding of internal-response; Oxygen is the molten steel surface active element, suppresses the dissolving of nitrogen in molten steel.Free oxygen in the molten steel has hindered dissolving, the diffusion of nitrogen element in molten steel in the ferro-silicon nitride.
It is low that above-mentioned two factors cause in the ferro-silicon nitride nitrogen element yield, and unstable, and refining nitrogen pick-up pressure is big, and the molten steel nitrogen content is unstable because refining is arrived at a station, and the refining treatment parameter is big, causes refining cycle accurately to estimate, is difficult to realize normalizing operation.Secondly, the variation of refining cycle can influence composition (like Als) and accuracy control over temperature, influences the rate that is smelt of oriented silicon steel.
Summary of the invention
To the low and unsettled reason of nitrogen element yield in the ferro-silicon nitride; The invention provides a kind of method that improves nitrogen yield in the ferro-silicon nitride; Purpose is to improve and the stable refining oriented silicon steel molten steel nitrogen content that arrives at a station, and stablize refining operation, makes steel-making logistics smoothness.
Technical solution of the present invention is: based on the steelmaking process of " hot metal pretreatment → bessemerize → RH vacuum-treat → continuous casting ", converter tapping finish or refining treatment before feeding ferro-silicon nitride cored-wire, use nitrogen or argon gas to stir molten steel simultaneously; Molten steel condition when feeding the ferro-silicon nitride cored-wire is that oxygen activity is less than 50ppm; The ferro-silicon nitride cored-wire is made up of foreskin and core powder, and the core powder is to be less than or equal to the 0.5mm meal by the granularity that ferro-silicon nitride is processed, and granularity is not more than 10% greater than the ratio of 0.5mm, and the cored-wire diameter is 9mm～16mm.
Technique effect of the present invention: the nitrogen element yield of ferro-silicon nitride is increased to more than 75% by less than 30%, and the yield fluctuation is little, and circulation ratio is high, helps follow-up refining procedure and accurately controls the molten steel nitrogen content.
Embodiment
The preparation of ferro-silicon nitride heart yearn
1, process granularity to ferro-silicon nitride less than 0.5mm core powder, granularity is not more than 10% greater than the ratio of 0.5mm.
2, wrap up silicon nitride iron core powder with iron sheet, require to coat firmly, good toughness, powder core density is even, must not leak powder or broken string, and the cored-wire diameter is 9mm～16mm.
3, cored-wire can be made into inner drawing type or two kinds of coils of wire of external, heavy (the not steely structure) 700kg～1000kg of volume.
Steelmaking process based on " hot metal pretreatment → bessemerize → RH vacuum-treat → continuous casting "; Converter tapping finish or refining treatment before adopt feeding wire machine feeding ferro-silicon nitride cored-wire; So that can accurate adjustment molten steel nitrogen content, make it accurate hit in follow-up refining treating processes.Ferro-silicon nitride cored-wire when feeding molten steel should deoxidation basically fully, and feeding speed 4～10m/sec in the line feeding process, uses the weak stirring of nitrogen or argon gas bottom blowing molten steel simultaneously, and with top of the slag fine motion, loseing molten steel is standard.
Above-mentioned basic deoxidation oriented silicon steel molten steel completely is characterized as: 0.025%≤C≤0.100%, Si≤4.0%, Mn≤2.0%; Al≤0.05%, P≤0.2%, O≤0.005%; %N≤0.010% also comprises in Sn, Sb, Cu, Cr, Ni, B and the rare earth one or more.
After the present invention used, the nitrogen element yield of ferro-silicon nitride was increased to more than 75% by less than 30%, and the yield fluctuation is little, and circulation ratio is high, helps follow-up refining procedure and accurately controls the molten steel nitrogen content.
Embodiment 1:
Based on the technology of " hot metal pretreatment → bessemerize → RH vacuum-treat → continuous casting " flow process production oriented silicon steel,
Tapping process uses ferro-aluminum, ferrosilicon and manganeseirom deoxidation; Tapping finishes, and each 300Nl/min of bottom blowing two-way argon flow amount blows (not revealing the molten steel face with top of the slag fine motion is as the criterion) a little less than argon flow amount changes into behind the stirring 2min; The ferro-silicon nitride cored-wire of feeding diameter 13mm; Cored-wire feeding speed is 4m/sec., and cored-wire amounts to that a ton steel add-on is 0.35kg (a ferro-silicon nitride nitrogen content 28%) behind the ferro-silicon nitride, and 3 stove molten steel nitrogen pick-up are in 75～85ppm scope; The average yield of nitrogen element reaches more than 80%, sees table 1 for details.
Table 1
| The heat sequence number | 1 | 2 | 3 | MV |
| Ton steel add-on/kg | 0.35 | 0.35 | 0.35 | 0.35 |
| Molten steel nitrogen increased amount/ppm | 75 | 80 | 85 | 80 |
| Yield/% | 76.5 | 81.6 | 86.70 | 81.6 |
Embodiment 2:
Tapping process uses ferro-aluminum, ferrosilicon and manganeseirom deoxidation; Tapping finishes, and each 300Nl/min of bottom blowing two-way argon flow amount blows (not revealing the molten steel face with top of the slag fine motion is as the criterion) a little less than argon flow amount changes into behind the stirring 2min; The ferro-silicon nitride cored-wire of feeding diameter 13mm; Cored-wire feeding speed is 8m/sec., and cored-wire amounts to that a ton steel add-on is 0.35kg (a ferro-silicon nitride nitrogen content 28%) behind the ferro-silicon nitride, and 3 stove molten steel nitrogen pick-up are in 80～85ppm scope; The average yield of nitrogen element reaches more than 80%, sees table 2 for details.
Table 2
| The heat sequence number | 1 | 2 | 3 | MV |
| Ton steel add-on/kg | 0.35 | 0.35 | 0.35 | 0.35 |
| Molten steel nitrogen increased amount/ppm | 81 | 80 | 85 | 82 |
| Yield/% | 82.7 | 81.6 | 86.7 | 83.7 |
Embodiment 3:
Tapping process uses ferro-aluminum, ferrosilicon and manganeseirom deoxidation, and tapping finishes, each 300Nl/min of bottom blowing two-way argon flow amount; Stir 2min; Ladle transports refining line feeding position to, blows control (not revealing the molten steel face with top of the slag fine motion is as the criterion) a little less than argon bottom-blowing changes into, the ferro-silicon nitride cored-wire of feeding diameter 13mm in refining line feeding position; Cored-wire feeding speed is 6m/sec., and cored-wire is amounted to ton steel add-on 0.35kg (ferro-silicon nitride nitrogen content 28%) behind the ferro-silicon nitride.3 stove molten steel nitrogen pick-up are in 80～86ppm scope, and the average yield of nitrogen element reaches more than 80%, sees table 3 for details.
Table 3
| The heat sequence number | 1 | 2 | 3 | MV |
| Ton steel add-on/kg | 0.35 | 0.35 | 0.35 | 0.35 |
| Molten steel nitrogen increased amount/ppm | 80 | 80 | 86 | 82.0 |
| Yield/% | 81.6 | 81.6 | 87.8 | 83.7 |
Embodiment 4:
Tapping process uses ferro-aluminum, ferrosilicon and manganeseirom deoxidation, and tapping finishes, each 300Nl/min of bottom blowing two-way nitrogen flow; Stir 2min; Ladle transports refining line feeding position to, blows control (not revealing the molten steel face with top of the slag fine motion is as the criterion) a little less than argon bottom-blowing changes into, the ferro-silicon nitride cored-wire of feeding diameter 13mm in refining line feeding position; Cored-wire feeding velocity potential 6m/sec., cored-wire amount to ton steel add-on 0.35kg (ferro-silicon nitride nitrogen content 28%) behind the ferro-silicon nitride.The nitrogen pick-up of 2 test molten steel is in 80～85ppm scope, and the average yield of nitrogen element reaches more than 80%, sees table 4 for details.
Table 4
| The heat sequence number | 1 | 2 | MV |
| Ton steel add-on/kg | 0.35 | 0.35 | 0.35 |
| Molten steel nitrogen increased amount/ppm | 81 | 85 | 83 |
| Yield/% | 82.7 | 86.7 | 84.7 |
Claims (1)
1. method that improves nitrogen yield in the ferro-silicon nitride; It is characterized in that: in the process of producing oriented silicon steel; Converter tapping finish or refining treatment before feeding ferro-silicon nitride cored-wire, use nitrogen or argon gas to stir molten steel simultaneously, the molten steel condition when feeding the ferro-silicon nitride cored-wire is that oxygen activity is less than 50ppm; The ferro-silicon nitride cored-wire is made up of foreskin and core powder; The core powder is to be less than or equal to the 0.5mm meal by the granularity that ferro-silicon nitride is processed, and granularity is not more than 10% greater than the ratio of 0.5mm, and the cored-wire diameter is 9mm～16mm.
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| CN102330010B (en) * | 2010-11-16 | 2013-10-30 | 首钢贵阳特殊钢有限责任公司 | Bismuth cored wire |
| CN102010937B (en) * | 2010-12-13 | 2012-07-25 | 首钢总公司 | Ladle furnace refining stirring process for preventing large quantity of slags from lumping by weak bottom blowing |
| CN104726641A (en) * | 2014-04-28 | 2015-06-24 | 浙江宝信新型炉料科技发展有限公司 | Titanium silicon nitride core-spun yarn |
| CN104388629B (en) * | 2014-11-28 | 2018-04-03 | 马鞍山市兴达冶金新材料有限公司 | One kind smelts V-bearing microalloyed steel silicon nitride ferrovanadium alloy claded wire and preparation method thereof |
| CN107699654B (en) * | 2017-09-25 | 2019-04-05 | 南京钢铁股份有限公司 | A kind of smelting process of ultra-low-carbon steel desulfurization rapidly |
| CN110438292A (en) * | 2019-08-05 | 2019-11-12 | 凌源钢铁股份有限公司 | A kind of method of molten steel nitrogen pick-up in process for making |
| CN115491463A (en) * | 2022-08-27 | 2022-12-20 | 萍乡泽昊新材料有限责任公司 | Method for improving rare earth yield in rare earth steel smelting process |
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| US6770366B2 (en) * | 2000-06-28 | 2004-08-03 | Affival S.A. | Cored wire for introducing additives into a molten metal bath |
| JP4470287B2 (en) * | 2000-06-30 | 2010-06-02 | Ｊｆｅスチール株式会社 | Manufacturing method of high carbon low nitrogen steel |
| CN1184342C (en) * | 2002-11-29 | 2005-01-12 | 莱芜钢铁集团有限公司 | Rare earth series easy cutting steel |
| CN1818086A (en) * | 2006-03-09 | 2006-08-16 | 攀钢集团攀枝花钢铁研究院 | Core-spun yarn for realizing molten steel vanadium and nitrogen alloying |
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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 |
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