CN101254526B - Special-shaped billet casting machine continuous casting weathering steel crystallizer protection slag - Google Patents
Special-shaped billet casting machine continuous casting weathering steel crystallizer protection slag Download PDFInfo
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- CN101254526B CN101254526B CN2008100185318A CN200810018531A CN101254526B CN 101254526 B CN101254526 B CN 101254526B CN 2008100185318 A CN2008100185318 A CN 2008100185318A CN 200810018531 A CN200810018531 A CN 200810018531A CN 101254526 B CN101254526 B CN 101254526B
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- slag
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- weathering steel
- continuous casting
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Abstract
The invention discloses a protective slag for beam blank continuous casting mould of weathering steel. The protective slag contains pre-melted slag, cement clinker, lithium carbonate, borax, fluorite, carbon black, graphite and bentonite. Compared with the prior art, the protective slag has the advantages of good surface quality of the casting blank and non-risk of binding steel leakage.
Description
Technical field
The present invention relates to crystallizer protecting residue, particularly special-shaped billet casting machine continuous casting O
9CuPCrNi weathering steel crystallizer protecting residue.
Background technology
In order to make the continuous casting billet cross dimensions further near finished size, reduce rolling pass, save the energy, near net shape continuous casting has become the development trend of modern continuous casting technology as special-shaped base H type continuous casting, sheet blank continuous casting.But, special-shaped base is because complex-shaped, crystallizer flow field and temperature field skewness, specific area are big, solidification shrinkage is obstructed easily, make the difficulty that in crystallizer, forms even base shell be greater than square billet, slab and other section, thereby cause generation blemish and bleed-out accident probability apparently higher than square billet and slab.As: the cast cross dimensions of special-shaped billet continuous casting machine: 750mm * 450mm * 120mm, pulling rate scope 0.6～0.85m/min.Weathering steel is O particularly
9The CuPCrNi weathering steel, because atmospheric corrosion resistance is had higher requirement, so the content of Cu, Cr, Ni and P element is higher in the composition.The chemical weight composition of covering slag typical case commonly used: CaO 40.3%, SiO
234.2%, Na
2O 4.6%, F
-3.8%, C 6.8%, and MgO 1.1%, Al
2O
38.3%, Fe
2O
30.9%; Physical property: 1165 ℃ of fusing points, 1300 ℃ viscosity 0.62PaS, 1197 ℃ of setting temperatures, burn-off rate are 36 seconds.When using this covering slag, except the slab surface crack incidence was higher, when being cast to the 3 stove left and right sides, the covering slag modification was bigger, mainly was that viscosity increases, and covering slag flows into and has some setbacks, and consumption reduces, and liquid slag layer thickens, and the slag bar increases, thickens; Hot-fluid reduces in the crystallizer in addition, and the attenuation of base shell causes bonding steel leakage at last, has seriously influenced production direct motion and delivery.
Summary of the invention
Technical problem to be solved by this invention provides a kind of big special-shaped billet casting machine continuous casting weathering steel crystallizer protecting residue that solves sticker type breakout and slab surface crack.
The technical scheme of technical solution problem of the present invention is: the crystallizer protecting residue of special-shaped billet casting machine continuous casting weathering steel, comprise pre-melted slag, clinker, lithium carbonate, borax, fluorite, carbon black, graphite, bentonite, and contained chemical analysis percentage by weight is:
CaO 33.0～39.0
SiO
2 32.0～38.0
li
2O 0.6～1.5
B
2O
3 2.0～4.0
Na
2O 3.0～5.0
F
- 3.5～5.5
C 4.0～6.0
MgO ＜3.0
Al
2O
3 ＜8.0
Fe
2O
3 ＜1.5
Described carbon is the mixture of carbon black and graphite, and its weight ratio is 1: 1～1.5.
The chemical analysis percentage by weight of described pre-melted slag is: CaO 44.0～46.0%, SiO
238.0 Al～42.0%,
2O
33.0 Fe～4.0%,
2O
30.5～1.5%, MgO 2.0～3.0%, Na
2O 4.0～6.0% and F
-2.0～4.0%.
The chemical analysis percentage by weight of described clinker is: CaO 62.0～64.0%, SiO
219.0 Al～21.0%,
2O
35.0 Fe～6.0%,
2O
33.5～4.5% and MgO 6.0～7.0%.
Pre-melted slag of the present invention, clinker, lithium carbonate, borax, fluorite, carbon black, graphite, bentonitic granularity are all less than 250 orders.
Preparation method of the present invention is: raw material preparation, batching, stirring and evenly mixing, water mill pulping, mist projection granulating, finished product packing, wherein mixing stirs and each 1 hour water mill pulping time.
The character of special-shaped billet casting machine continuous casting weathering steel crystallizer protecting residue: fusing point (hemisphere point temperature) is 1090～1130 ℃; 1300 ℃ viscosity is 0.35～0.55PaS; Setting temperature is 1140～1180 ℃ (temperature-viscosity curve judgements); Burn-off rate is 26～32 seconds (test of slag post method).
Slab surface crack produces reason, the carbon content that is the O9CuPCrNi weathering steel on the one hand falls into the peritectic reaction district, in crystallizer in the solidification of molten steel process, peritectic reaction takes place increases the phase transformation volume contraction, be that base shell linear shrinkage amount is big, the space becomes big between crystallizer wall and base shell like this, thereby causes the hot-fluid inequality easily; Be the constituent content height such as phosphorus, copper of O9CuPCrNi weathering steel on the other hand, the segregation tendency is big in process of setting, makes the embrittlement of grain boundaries of steel.The reason of two aspects makes strand be easy to generate face crack.
Easily the bleed-out accident taking place in the casting process mainly is to contain elements such as chromium, copper, nickel in the O9CuPCrNi weathering steel; reduced the heat transfer of base shell and crystallizer, the attenuation of base shell, covering slag flows into difficulty; cause base shell and copper plate of crystallizer to bond, thereby cause sticker type breakout.
Continuous crystallizer protecting slag is being controlled the heat transfer of casting process and is being lubricated, thereby is controlling the crackle of initial solidification shell and the bonding steel leakage of casting process.Therefore, eliminate O
9Bonding and bleed-out accident in the big casting for shaped blank continuous process of CuPCrNi weathering steel, or the blemish that causes by crackle, the processing performance of crystallization control device covering slag is considerable, emphasis is the continuity of lubrication and to the controllability of heat flow.
The present invention controls the dual alkalinity of covering slag in 1.00～1.15 scopes.Secondly, adopt except Na
2O and CaF
2The method of the multiple flux that conventional flux is outer is regulated covering slag fusing point and viscosity, wherein li
2O is an important flux, to reducing covering slag viscosity and fusing point highly significant, while Li
2O can also strengthen the ability that covering slag absorbs field trash, stablizes the physical property of covering slag, Li in the covering slag of the present invention
2O content control range is 0.6～1.5%; B
2O
3Except having the effect that reduces covering slag fusing point and viscosity, importantly have the ability of oxide inclusion in the strong absorption steel, stablize the physical property of covering slag, B in the covering slag of the present invention
2O
3The content control range is 2.0～4.0%; Na as GPF (General Protection False slag flux important component
2O, the content control range is 3.0～5.0% in covering slag of the present invention, main effect remains regulates fusing point and viscosity; It is to reduce slag viscosity that F in the covering slag mainly acts on, and improves the melt cinder flowability, and F content control range is 3.5～5.5% in the covering slag of the present invention.At last, claimed exactly slag melts fast, forms enough liquid slag layers and guarantees certain slag consumption.The requirement mixed carbon comtent can not be too high, but can not be low excessively, 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 covering slag.Therefore, join the carbon mode and adopt the compound carbon of joining, kind is selected big and fast carbon black and the graphite of burning velocity of specific area for use, and C content control range is 4.0～6.0% in the covering slag of the present invention.MgO, Al
2O
3And Fe
2O
3For raw material is brought composition into, require respectively less than 3.0%, 8.0% and 1.5%.
The performance of covering slag depends on the selection of system slag base-material, 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 pre-melted type slag and clinker as covering slag, owing to reduced the allocation ratio of raw material, the stability of Slag Properties is improved.
The present invention compared with prior art, it is good to have a cc billet surface quality, no adhesion bleed-out accident characteristic.
The specific embodiment
Below in conjunction with embodiment the present invention is done detailed explanation.
Embodiment 1:
Covering slag chemical analysis: CaO 34.5%, SiO
234.1%, li
2O 1.4%, B
2O
33.8%, Na
2O 4.2%, F
-5.3%, C 5.7%, and MgO 2.9%, Al
2O
36.7%, Fe
2O
31.4%.The covering slag physical property: 1098 ℃ of fusing points, 1300 ℃ viscosity 0.39PaS, 1149 ℃ of setting temperatures, burn-off rate are 30 seconds.
Embodiment 2:
Covering slag chemical analysis: CaO 36.2%, SiO
235.2%, li
2O 1.1%, B
2O
33.2%, Na
2O 4.8%, F
-4.7%, C 5.8%, and MgO 2.6%, Al
2O
35.5%, Fe
2O
30.9%.The covering slag physical property: 1114 ℃ of fusing points, 1300 ℃ viscosity 0.45PaS, 1162 ℃ of setting temperatures, burn-off rate are 27 seconds.
Embodiment 3:
Covering slag chemical analysis: CaO 37.9%, SiO
237.5%, li
2O 0.7%, B
2O
32.9%, Na
2O 3.5%, F
-5.1%, C 4.6%, and MgO 2.0%, Al
2O
34.7%, Fe
2O
31.1%.The covering slag physical property: 1121 ℃ of fusing points, 1300 ℃ viscosity 0.51PaS, 1156 ℃ of setting temperatures, burn-off rate are 28 seconds.
Embodiment 4:
Covering slag chemical analysis: CaO 38.8%, SiO
23 3.9%, li
2O 0.9%, B
2O
32.5%, Na
2O 4.3%, F
-3.9%, C 4.9%, and MgO 1.8%, Al
2O
37.8%, Fe
2O
31.2%.The covering slag physical property: 1126 ℃ of fusing points, 1300 ℃ viscosity 0.42PaS, 1175 ℃ of setting temperatures, burn-off rate are 31 seconds.
This covering slag that embodiment 1-4 is produced, cast O9CuPCrNi weathering steel on the big special-shaped billet continuous casting machine of 750mm * 450mm * 120mm, its main component is: C:0.03～0.12%; P:0.06～0.12%; Cu:0.25～0.35%; Cr:0.30～0.80%; Ni:0.20～0.30%; Nb:0.03～0.05%; Al:0.004～0.030%, the slag consumption when pulling rate is stabilized in 0.70m/min. are 0.90kg/T steel, molten steel surface liquid slag layer thickness 8～12mm.Show that through site test results covering slag spreadability, heat insulating ability and meltdown property performance in crystallizer is good; Four face heat outputs are stable and even in the crystallizer; In the casting process, the covering slag stable performance, the highest company waters the stove number and reaches 10 stoves, the sticker type breakout accident do not occur, and cc billet surface quality is good.
Claims (5)
1. the crystallizer protecting residue of special-shaped billet casting machine continuous casting weathering steel, it is characterized in that: comprise pre-melted slag, clinker, lithium carbonate, borax, fluorite, carbon black, graphite, bentonite, contained chemical analysis percentage by weight is:
CaO 33.0～39.0
SiO
2 32.0～38.0
li
2O 0.6～1.5
B
2O
3 2.0～4.0
Na
2O 3.0～5.0
F
- 3.5～5.5
C 4.0～6.0
MgO ＜3.0
Al
2O
3 ＜8.0
Fe
2O
3 ＜1.5
The character of described covering slag: fusing point is 1090～1130 ℃; 1300 ℃ viscosity is 0.35～0.55PaS; Setting temperature is 1140～1180 ℃; Burn-off rate is 26～32 seconds.
2. the crystallizer protecting residue of special-shaped billet casting machine continuous casting weathering steel according to claim 1, it is characterized in that: described carbon is the mixture of carbon black and graphite, its weight ratio is 1: 1～1.5.
3. the crystallizer protecting residue of special-shaped billet casting machine continuous casting weathering steel according to claim 1, it is characterized in that: the chemical analysis percentage by weight of described pre-melted slag is: CaO 44.0～46.0%, SiO
238.0 Al～42.0%,
2O
33.0 Fe～4.0%,
2O
30.5～1.5%, MgO 2.0～3.0%, Na
2O 4.0～6.0% and F
-2.0～4.0%.
4. the crystallizer protecting residue of special-shaped billet casting machine continuous casting weathering steel according to claim 1, it is characterized in that: the chemical analysis percentage by weight of described clinker is: CaO 62.0～64.0%, SiO
219.0 Al～21.0%,
2O
35.0 Fe～6.0%,
2O
33.5～4.5% and MgO 6.0～7.0%.
5. the crystallizer protecting residue of special-shaped billet casting machine continuous casting weathering steel according to claim 1, it is characterized in that: pre-melted slag of the present invention, clinker, lithium carbonate, borax, fluorite, carbon black, graphite, bentonitic granularity are all less than 250 orders.
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|---|---|---|---|
| CN2008100185318A CN101254526B (en) | 2008-02-22 | 2008-02-22 | Special-shaped billet casting machine continuous casting weathering steel crystallizer protection slag |
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|---|---|---|---|
| CN2008100185318A CN101254526B (en) | 2008-02-22 | 2008-02-22 | Special-shaped billet casting machine continuous casting weathering steel crystallizer protection slag |
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| Publication Number | Publication Date |
|---|---|
| CN101254526A CN101254526A (en) | 2008-09-03 |
| CN101254526B true CN101254526B (en) | 2010-06-23 |
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| CN102019384B (en) * | 2010-12-08 | 2013-11-20 | 西峡龙成冶金材料有限公司 | High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel |
| CN102078949A (en) * | 2011-01-28 | 2011-06-01 | 东北大学 | Continuous casting mold powder for ferrite stainless steel and preparation method thereof |
| CN103042187B (en) * | 2012-12-21 | 2016-01-20 | 江苏大学 | A kind of high-titanium alloy welding wire steel protective slag for continuous casting and preparation method thereof |
| CN104707958B (en) * | 2013-12-11 | 2017-08-25 | 宝山钢铁股份有限公司 | Casting peritectic steel high alkalinity continuous casting covering slag |
| CN105598404B (en) * | 2016-03-09 | 2018-09-14 | 西峡龙成冶金材料有限公司 | A kind of shaped blank mild steel continuous crystallizer protecting slag |
| CN109382489A (en) * | 2017-08-10 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of carbon aluminium-killed steel crystallizer protecting residue |
| CN109332619B (en) * | 2018-11-26 | 2021-02-19 | 攀钢集团攀枝花钢铁研究院有限公司 | YQ450NQR 1B-shaped steel bloom shell quality control method |
| CN109382490B (en) * | 2018-11-26 | 2021-02-19 | 攀钢集团攀枝花钢铁研究院有限公司 | YQ450NQR 1B-shaped steel bloom surface quality control method |
| CN109317628B (en) * | 2018-11-26 | 2021-02-19 | 攀钢集团攀枝花钢铁研究院有限公司 | YQ450NQR 1B-shaped steel bloom corner crack control method |
| CN110788293B (en) * | 2019-12-18 | 2021-05-18 | 马鞍山钢铁股份有限公司 | High-weather-resistance continuous casting process for special-shaped blank for hot rolling H-shaped steel |
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