CN101745616B - Carbon alloy structure steel continuous casting crystallizer function protection material in stainless steel rectangular billet - Google Patents
Carbon alloy structure steel continuous casting crystallizer function protection material in stainless steel rectangular billet Download PDFInfo
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- CN101745616B CN101745616B CN 201010030223 CN201010030223A CN101745616B CN 101745616 B CN101745616 B CN 101745616B CN 201010030223 CN201010030223 CN 201010030223 CN 201010030223 A CN201010030223 A CN 201010030223A CN 101745616 B CN101745616 B CN 101745616B
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Abstract
The invention discloses a carbon alloy structure steel continuous casting crystallizer function protection material in a stainless steel rectangular billet, which comprises the following compositions in percentage by weight: 1.50 percent of imported carbon black, 1.20 percent of superfine graphite, 3.0 percent of high grade carbon powder, 10.0 percent of clay, 12.0 percent of cryolite, 2.0 percent of fused magnesite, 5.0 percent of fluorite barium carbonate, 3.0 percent of sodium carbonate, 10.0 percent of fluorite, 4.0 percent of wollastonite, 3.50 percent of graphite carbon and 34 percent of bentonite. When used, the function protection material has the advantages of favorable expression of the spreadability, the insulation ability and the melting performance in a crystallizer, stable and uniform heat transfer quantity in the crystallizer, satisfying the casting speed requirements in a fluctuation range, no slag strip in test slag so as to improve the phenomenon of uneven flowing in, favorable lubricating ability so as to prevent sticking breakout, no phenomena of crack, slag inclusion and slag sticking on the surface of a casting billet and favorable casting billet surface quality.
Description
Technical field
The invention belongs to the metallurgic auxiliary materials technical field, particularly carbon closes knot steel continuous casting crystallizer function protective material in a kind of stainless steel rectangular base.
Background technology
Ripe and fast-developing along with domestic continuous casting technology.Metallurgy industry is invested main task and is developed the important content that high-quality steel are listed development in energetically.In the high-quality excellent special steel continuous casting continuous casting production process; also must take the necessary measures to guarantee the quality of product; owing to add alloy content in the high-quality excellent special steel; cause that field trash increases in the molten steel; therefore require function protective material to have stronger dross inclusion adsorption ability; and behind the function protective material dross inclusion adsorption; play the direct motion that physicochemical property still can satisfy continuous casting process; the rectangular bloom crystallizer function protective material that adapts to becomes that the continuous casting worker is concerned about and the emphasis of work so development and production are complementary with it, and therefore developing in the rectangular bloom carbon, to close knot steel series crystallizer function protective material be one of them.
Xining special steel conticaster, the cast section: 250*280, pulling rate between 0.75-0.90m/min., the steel grade 35 of cast, 25M, 25MN, 30MN, 35MN, 25MN2,30MN2,35MN2 etc.C quality percentage composition in the molten steel: 0.25～0.35%.The quality percentage composition 0.02～0.045% of Als.The metallurgical function of crystallizer function protective material come-up aluminium oxide in guaranteeing to lubricate, improve heat transfer, absorption dissolving molten steel is very crucial.Therefore, in order to realize good operating characteristics and to obtain satisfied quality, function protective material is proposed higher requirement: 1) suitable liquid slag layer thickness, also super thick the and Bao Douhui of slag blanket is that strand cracks and depression etc.2) reduce the production of slag circle, the slag barnyard manure is greatly can the passage that also slag flows downward be blocked, and the local more long surperficial lobe of stopping up of time is just more serious.3) the slag consumption of suitable slag consumption, function protective material is along with the viscosity of melt cinder, and the mold oscillation frequency, negative slip is green and the reduction of pulling rate and increasing.
Summary of the invention
The invention provides and a kind ofly solve that carbon in the casting stainless steel closes that knot steel surface bonds, insufficient lubrication, cause in the stainless steel rectangular base of bonding steel leakage, casting billet surface lobe depression and dry slag quality problems carbon to close to tie the steel continuous casting crystallizer function protective material.
Carbon closes knot steel continuous casting crystallizer function protective material in a kind of stainless steel rectangular base; the raw material of this function protective material comprises following composition: import carbon black, superfine graphite, high-grade carbon dust, clay, ice crystal, fused magnesite, fluorite brium carbonate, sodium carbonate, fluorite, wollastonite, graphitic carbon, bentonite, its weight percentage is respectively 1.50%, 12.0%, 3.0%, 10.0%, 12.0%, 2.0%, 5.0%, 3.0%, 10.0%, 4.0%, 3.50%, 34%.
The BaO weight percentage is that 1.60～2.30%, MgO weight percentage is 2.0～3.0% in the described function protective material, and all the other comprise SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
230.18%, CaO 26.12%, Al
2O
3＜10.0%, Na
2O 4.15%, F
-3.0 K～5.0%,
2O 0.50-1.00%, the dual alkalinity (CaO/SiO of described function protective material
2) be 0.70～0.90.
In the stainless steel rectangular base carbon close the knot steel carbon content be 0.20～0.35%; in process of setting; steel is big in meniscus place solidification shrinkage; form longitudinal crack easily; because the adding of alloy, fluidity molten steel is poor relatively, and to be mingled with ability strong in the absorption of function protective material in addition; the performance of severe exacerbation function protective material, it is smooth to influence continuous casting process.Therefore, adopt the high vitreum function protective material of high basicity, in casting process, absorb and assimilation come-up field trash, keep function protective material stable rheological behavior under insulation.Adopt multiple flux, remarkable to function protective material viscosity and fusing point, can also improve the function protective material greasy property simultaneously.
Function protective material chemical composition design: the dual alkalinity (CaO/SiO that at first requires function protective material
2Mass ratio) can not be too high, generally be less than 0.90, to guarantee that the slag film forms good glassy state in the crystallizer, improve lubricating between base shell and the crystallizer, the present invention controls the dual alkalinity of function protective material in 0.70～0.90 scope.Secondly, adopt method regulatory function protective material fusing point and the viscosity of multiple flux, wherein BaO is an important flux, remarkable to reducing function protective material viscosity and fusing point, BaO can also improve the greasy property of function protective material simultaneously, reduce the calculus amount that the slag circle is separated out, make slag circle reduced thickness a lot, BaO weight percentage control range is 2.5% in the function protective material of the present invention; MgO can reduce function protective material fusing point, viscosity, crystallization temperature and setting temperature, improves the stability of function protective material, and MgO weight percentage control range is 2.0～3.0% in the function protective material of the present invention; Na as conventional func protective material flux important component
2Content can not be too high in function protective material of the present invention for O, avoids separating out nepheline in the slag film on the one hand, destroys the glass properties of slag film, reduces the Na in the function protective material
2O content also can improve the surface tension of function protective material simultaneously, is conducive to slag-Jin and separates, and reduces casting billet surface slag inclusion and dry slag, Na in the function protective material of the present invention
2O weight percentage control range is 4.0～5.0%; F in the function protective material
-Main effect is to reduce slag viscosity, improves the melt cinder flowability, but will pay special attention to control the F in the function protective material in the present invention
-If content is CaF in the slag
2Too high levels can cause cuspidine (3CaO.2SiO
2.CaF
2) wait separating out of high-melting-point thing, destroy the glass of slag, lubricating condition is worsened, in addition F
-Too high levels also can cause serious erosion to stretching into the formula mouth of a river, reduces mouth of a river service life, for this reason, and F in the function protective material of the present invention
-The weight percentage control range is 3.0～5.0%.At last, require function protective material to melt fast exactly, form enough liquid slag layers and guarantee certain slag consumption.The requirement mixed carbon comtent can not be on the low side, otherwise the liquid slag layer and the sinter layer that form are too thick, make that the slagging scorification bar is serious, hinders the even inflow of function protective material.Therefore, join the carbon kind and select the big and fast carbon black of burning velocity of specific area for use.C weight percentage control range is 12.0～17.5% in the function protective material of the present invention.
The function protective material physical property is determined.The present invention requires function protective material to have appropriate melting point, viscosity, burn-off rate.Requirement specifically is set is: fusing point (hemisphere point temperature) is 1120～1170 ℃; 1300 ℃ viscosity is 0.50～0.65 PaS; Burn-off rate is 36～45 seconds (test of slag post method).
Join selecting for use and characteristics of slag base-material.The performance of function protective material depends on the selection of slag base-material processed, and conventional machine mixes slag and mainly adopts multiple raw material to mix, and has influence on performance variation owing to the back that is heated produces decomposition of chemical compounds, has influenced the stability of slag.This research is selected to join the slag base-material with the pre-melted type slag as function protective material, and this special pre-melted type slag is except containing conventional pre-melted type slag basis, as SiO
2, CaO, Al
2O
3, Na
2O, F
-, also contain the MgO composition of function protective material needs of the present invention.Because reduced the allocation ratio of raw material, the stability of Slag Properties is improved.
Production technology and quality control standard.The physicochemical property stability of function protective material finished product is directly related with use production technology and control criterion.In order to adapt to the high-quality demand of low-carbon (LC) bloom function protective material, function protective material of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires by 320 orders; 2) mixing stirs and each 1 hour water mill pulping time.
Adopt above-mentioned result of study by this function protective material of producing; in the high, normal, basic carbon Series Steel of Xining special steel 3 machines, 3 stream large square bland continuous-casting machine cast, the slag consumption of pulling rate when 0.75-1.0 m/min. is 0.50 Kg/T steel, molten steel surface liquid slag layer thickness 7～12mm.Show that through site test results when this function protective material used, spreadability, heat insulating ability and meltdown property performance were good in crystallizer; Heat output is stable and even in the crystallizer, satisfies the pulling rate requirement in the fluctuation range; The test slag does not have the slag bar, has improved the inflow uneven phenomenon, and the function protective material lubricity is good, has prevented sticker type breakout.Casting billet surface does not have crackle, slag inclusion and dry slag phenomenon, and cc billet surface quality is good.
The specific embodiment
Carbon closes knot steel continuous casting crystallizer function protective material in a kind of stainless steel rectangular base; the raw material of this function protective material comprises following composition: comprise import carbon black, superfine graphite, high-grade carbon dust, clay, ice crystal, fused magnesite, fluorite brium carbonate, sodium carbonate, fluorite, wollastonite, graphitic carbon, bentonite, its weight percentage is respectively 1.50%, 12.0%, 3.0%, 10.0%, 12.0%, 2.0%, 5.0%, 3.0%, 10.0%, 4.0%, 3.50%, 34%.
The BaO weight percentage is that 1.60～2.30%, MgO weight percentage is 2.0～3.0% in the described function protective material, and all the other comprise SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
230.18%, CaO 26.12%, Al
2O
3＜10.0%, Na
2O 4.15%, F
-3.0 K～5.0%,
2O 0.50-1.00%, the dual alkalinity (CaO/SiO of described function protective material
2) be 0.70～0.90.
Production technology and quality control standard: the physicochemical property stability of function protective material finished product is directly related with use production technology and control criterion.In order to adapt to the high-quality demand of low-carbon (LC) bloom function protective material, function protective material of the present invention has adopted following quality control standard: 1) every kind of raw material granularity requires by 320 orders; 2) mixing stirs and each 1 hour water mill pulping time.
Adopt above-mentioned result of study by this function protective material of producing; in the high, normal, basic carbon Series Steel of Xining special steel 3 machines, 3 stream large square bland continuous-casting machine cast, the slag consumption of pulling rate when 0.75-1.0 m/min. is 0.50 Kg/T steel, molten steel surface liquid slag layer thickness 7～12mm.Show that through site test results when this function protective material used, spreadability, heat insulating ability and meltdown property performance were good in crystallizer; Heat output is stable and even in the crystallizer, satisfies the pulling rate requirement in the fluctuation range; The test slag does not have the slag bar, has improved the inflow uneven phenomenon, and the function protective material lubricity is good, has prevented sticker type breakout.Casting billet surface does not have crackle, slag inclusion and dry slag phenomenon, and cc billet surface quality is good.
Claims (1)
1. carbon closes knot steel continuous casting crystallizer function protective material in the stainless steel rectangular base; it is characterized in that: the raw material of this function protective material comprises following composition: import carbon black, superfine graphite, high-grade carbon dust, clay, ice crystal, fused magnesite, brium carbonate, sodium carbonate, fluorite, wollastonite, graphitic carbon, bentonite, its weight percentage is respectively 1.50%, 12.0%, 3.0%, 10.0%, 12.0%, 2.0%, 5.0%, 3.0%, 10.0%, 4.0%, 3.50%, 34%.
According to claim 1 in the stainless steel rectangular base carbon close knot steel continuous casting crystallizer function protective material, it is characterized in that: the BaO weight percentage is that 1.60～2.30%, MgO weight percentage is 2.0～3.0% in the described function protective material, and all the other comprise SiO
2, CaO, Al
2O
3, Na
2O, F
-, K
2O, its weight percentage are SiO
230.18%, CaO 26.12%, Al
2O
3＜10.0%, Na
2O 4.15%, F
-3.0 K～5.0%,
2O 0.50-1.00%, the dual alkalinity (CaO/SiO of described function protective material
2) be 0.70～0.90.
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|---|---|---|---|
| CN 201010030223 CN101745616B (en) | 2010-01-21 | 2010-01-21 | Carbon alloy structure steel continuous casting crystallizer function protection material in stainless steel rectangular billet |
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|---|---|---|---|
| CN 201010030223 CN101745616B (en) | 2010-01-21 | 2010-01-21 | Carbon alloy structure steel continuous casting crystallizer function protection material in stainless steel rectangular billet |
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| CN101745616A CN101745616A (en) | 2010-06-23 |
| CN101745616B true CN101745616B (en) | 2013-08-21 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009142B (en) * | 2010-08-09 | 2012-10-03 | 河南省西保冶材集团有限公司 | 30MnSi steel special continuous casting crystallizer functional protection material |
| CN102009145B (en) * | 2010-08-09 | 2012-10-03 | 河南省西保冶材集团有限公司 | Function protecting material of specific continuous casting crystallizer of 510L automotive beam steel |
| CN102019383B (en) * | 2010-08-09 | 2012-10-03 | 河南省西保冶材集团有限公司 | Special functional protection material of continuous casting crystallizer for alloy tool steel |
| CN106077546A (en) * | 2016-08-25 | 2016-11-09 | 贺州市创伟冶金耐材有限公司 | A kind of covering slag in steelmaking process |
| CN108160960A (en) * | 2017-12-28 | 2018-06-15 | 西峡龙成冶金材料有限公司 | A kind of 400 stainless steel continuous crystallizer protecting slags |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5179997A (en) * | 1991-09-12 | 1993-01-19 | Atlantic Metals Corporation | Process for insulating molten steel during continuous casting |
| CN1117898A (en) * | 1995-06-03 | 1996-03-06 | 伊川县保护渣厂 | Casting powder for continuously casting crystallizer |
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN1411931A (en) * | 2001-10-16 | 2003-04-23 | 广州珠江钢铁有限责任公司 | Protective slag for CSP thin plate blank continuously-casting crystallizer |
| CN101628326A (en) * | 2009-08-17 | 2010-01-20 | 河南省西保冶材集团有限公司 | Square billet ultra-low carbon steel continuous casting functional protection material |
-
2010
- 2010-01-21 CN CN 201010030223 patent/CN101745616B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5179997A (en) * | 1991-09-12 | 1993-01-19 | Atlantic Metals Corporation | Process for insulating molten steel during continuous casting |
| CN1117898A (en) * | 1995-06-03 | 1996-03-06 | 伊川县保护渣厂 | Casting powder for continuously casting crystallizer |
| CN1322597A (en) * | 2001-04-26 | 2001-11-21 | 刘长福 | Pre-molten protective particle sludge and its production process |
| CN1411931A (en) * | 2001-10-16 | 2003-04-23 | 广州珠江钢铁有限责任公司 | Protective slag for CSP thin plate blank continuously-casting crystallizer |
| CN101628326A (en) * | 2009-08-17 | 2010-01-20 | 河南省西保冶材集团有限公司 | Square billet ultra-low carbon steel continuous casting functional protection material |
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