CN103381473A - Special protecting material for oversized round billet made of medium carbon steel for continuous casting mold - Google Patents
Special protecting material for oversized round billet made of medium carbon steel for continuous casting mold Download PDFInfo
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- CN103381473A CN103381473A CN201310310573XA CN201310310573A CN103381473A CN 103381473 A CN103381473 A CN 103381473A CN 201310310573X A CN201310310573X A CN 201310310573XA CN 201310310573 A CN201310310573 A CN 201310310573A CN 103381473 A CN103381473 A CN 103381473A
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Abstract
The invention discloses a special protecting material for an oversized round billet made of medium carbon steel for a continuous casting mold. The protecting material comprises the following materials by mass percent: 40.0% of pre-melting material, 16% of albite in powder, 3% of cement clinker, 12.0% of sodium carbonate, 5.5% of fluorite, 1% of iron oxide red, 2.5% of lithium carbonate, 14% of black carbon and 6% of 85flake graphite. The protecting materials produced by Henan Xibao Metallurgy Materials Group Co., Ltd can be melted uniformly in a crystallizer with less slag circles and have good spreadability and good thermal insulation performance, clots do not exist, the thickness of melt cinders is 10 to 12 mm at normal pulling speed, the steel consumption for each ton of protecting materials is 0.35 kg to 0.45 kg, the heat transmission at periphery in the crystallizer is stable and uniform, alarm does not exist, and cleaning free rate for surfaces of casting blanks can reach more than 98%, so that requirements for producing large-sized round billets for factories can be met.
Description
Technical field
The invention belongs to the metallurgic auxiliary materials technical field, particularly the continuous-casting crystallizer especially used protective material of a kind of super large round billet medium carbon steel.
Background technology
Modern seamless steel pipe has adopted advanced process for making and external refining means, and the technology such as protection cast, electromagnetic agitation have been adopted during continuous casting, therefore lumber recovery reaches more than 98%, and the outer surface flawless, scab, slag inclusion, depression, bubble and other degree of depth scratch greater than the machinery of 1.5mm and the defective such as impression; The crackle of pipe inside, pore, segregation and be mingled with and the state of solidified structure also can meet the requirement of tube rolling.Therefore the circle base has become the first-selection that modern seamless steel pipe hot-rolling continuous rolling production line is used pipe.
Although the super large round billet continuous casting machine of domestic certain steel mill (cast section ￠ 800; pulling rate 0.3～0.5m/min) is constructed and put into operation; and Introduced From Abroad group continuous casting protective material; for the examination of casting machine heat and examination; but there are the problems such as expensive, that the test period is long in many-sided expression imported relay material; making steel mill increase production cost, consider that therefore using domestic protective material is Xi Bao group---the round base privacy protection material of this model satisfies Production requirement.
Super large round billet characteristic: medium carbon steel W(C≤0.20～0.50%); Continuous casting steel has following characteristics: 1. due to molten steel P, S segregation, the initial base shell solidification shrinkage that generates is little, and the base shell contacts with crystallizer wall closely under the ferrostatic pressure effect, and the frictional resistance that in process of billet withdrawal, the base shell is subject to is large, the base shell easily bonds with crystallizer wall, causes bonding steel leakage.2. the base shell contacts well with crystallizer wall, and heat-transfer capability is strong, shell growth comparatively fast and relatively even, the probability that crackle appears in initial solidification shell is less, but reclosing ability between the base shell, easily pulls or bleed-out in base shell junction.3. because the segregations such as P, S, C in molten steel are serious, cause casting blank inner organization composition segregation, loose; If crystallization water intensity of cooling is excessive, be prone to underbead crack.The appearance and size of continuous cast round billets comprises that diameter deviation, length variation, ovality, flexibility, the end face of strand cut gradient etc., the appearance and size of strand exceeds standard and can bring adverse effect to the operation of tube rolling operation of lower step, therefore to strictly control, so protective material is had higher requirement: 1. good dross inclusion adsorption and stable melting characteristic and control heat energy power: because in this steel, easily the oxidation element is many, protective material needs good absorption molten steel floating field trash, and makes the melt cinder physical property keep stable; 2. suitable liquid slag layer thickness: liquid slag layer is blocked up or excessively thin, and casting billet surface such as all can crack at the defective, and especially not enough in very with thickness, crack number increases severely with the attenuate of liquid slag layer; 3. reducing the slag circle generates: can the passage that melt cinder flows downward be blocked when the slag circle is thick, the local longer Longitudinal Surface Cracks of time that stops up is just more serious; 4. suitable slag consumption: the slag consumption of protective material increases along with the minimizing of melt cinder viscosity, mold oscillation frequency, minus sliding ratio and pulling rate; 5. suitable viscosity coefficient of dross and slag film thickness: suitable viscosity could protect suitable melt cinder to supply with; thereby guarantee the even inflow of melt cinder, the slag film that acquisition is evenly distributed guarantees evenly solidifying of strand; reduce frictional force and make crystallizer heat radiation homogenising, prevent generation and the bonding steel leakage of crackle.In a word, the core of this protective material technology is exactly rapid slagging, to guarantee lubricating the strand abundance; Simultaneously must make crystallizer protective material liquid slag film have good fillibility and slow cooling, prevent that the inhomogeneous of strand from solidifying, thereby guarantee to obtain under high pulling rate working condition high-quality strand.
The reason that the appearance and size of super large continuous cast round billets exceeds standard is relatively simple, affected by equipment precision and process for cooling, but control to get up also to be not easy, therefore also only improving equipment precision and controlling to adopt an effective measure on slab cooling technique and just can avoid the appearance and size of strand to exceed standard.The continuous cast round billets diameter deviation is main relevant with the crystallizer change in size; The strand length variation is main relevant with the precision of cutting control system; The strand ovality mainly is subjected to the impact of withdrawal straightening machine pressure; The solidifying of the uniformity that the casting blank bending degree is main and strand whole process is cooling and the steel place of watering, cooling characteristics are relevant; It is main relevant with cutting medium and control stability that casting blank end surface is cut gradient.
To sum up state reason; the protective material of most of strand and use has direct relation; therefore when casting medium carbon steel; for guaranteeing the continuous casting process direct motion; except under reasonable crystallization control device vibration parameters, pulling rate and stable casting condition; most critical is exactly to promote the lubricated of strand by protective material, reduces resistance of billet withdrawal.
Summary of the invention
The invention provides a kind of spreadability, heat insulating ability and the good continuous-casting crystallizer especially used protective material of super large round billet medium carbon steel of meltdown property performance.
The continuous-casting crystallizer especially used protective material of a kind of super large round billet medium carbon steel comprises pre-melt, albite in powder, clinker, sodium carbonate, fluorite, iron oxide red, lithium carbonate, carbon black, 85 crystalline flake graphites; Its quality percentage composition is respectively 40.0%, 16%, 3%, 12.0%, 5.5%, 1%, 2.5%, 14%, 6%, and described pre-melt composition comprises: SiO
228.0～33.0%, CaO 21.0～25.0%, Al
2O
36.0～9.0%, R
2O 3.0～7.0%, F
-2.5～6.0%
The effective ingredient of described protective material comprises SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
229.5～35.5%, CaO 18.0～24.0%, Al
2O
33～5%, Na
2O 6.0～10.0%, F
-1.5～4.0%, MgO 1.5～4.0%, Fe
2O
30.5～2.5%.
Dual alkalinity (the CaO/SiO of described protective material
2) be 0.55～0.75.
This super large round billet continuous casting adopts multipoint straightening full arc shape conticaster, and crystallizer equipment has fluid level control system and electromagnetic stirring system.Molten steel is through after vacuum refining, and it is lower that molten steel is mingled with content, and therefore claimed material must melt evenly, avoids the slag under the protective material inhomogeneous and unreasonable generation crystallizer of fusing flow field, reduction slag film lubrication and cleanliness.In order to guarantee that strand lubricates and the ability of absorb inclusion thing; the crystallization proportion control is in 30% left and right; basicity R value is taken at 0.55～0.75; viscosity is controlled at 1.0PaS; fusing point be controlled between 1070～1130 ℃ drop to the consumption that guarantees protective material minimum, protective material performance indications selection result such as following table:
Table 1 protective material performance indications
| Basicity | Fusing point/℃ | Viscosity/PaS | Consumption per ton of steel/kg |
| 0.55～0.75 | 1070～1130 | 0.9～1.1 | 0.3～0.5 |
For in the situation that basicity is lower, improve protective material fusing uniformity, except adopting the pre-melted slag type, also utilize the multiple combination material to reduce fractional melting.
The performance of protective material depends on the selection of slag base-material processed, and the mixed slag of conventional machine mainly adopts multiple raw material to mix.This research is selected to join the slag base-material with wollastonite as protective material, and the conventional ingredient that this material contains is: SiO
2, CaO, MgO, Al
2O
3, compare with the pre-melt of routine and do not contain Na
2O, F
-, effectively controlled Na in slag
2O, F
-Content, acquisition has the slag film of suitable glass and crystal property, guarantees lubricating between strand and crystallizer, and the stability of Slag Properties is improved, and has obviously increased the stability of result of use.The physicochemical property stability of protective material finished product is directly related with use production technology and control criterion.In order to adapt to the high-quality demand of high pulling rate protective material, protective material of the present invention has adopted following quality control standard: every kind of raw material granularity requires by 320 orders; Mixing stirs and each 1h of water mill pulping time.
The carbonaceous material kind is a lot, along with the difference in the place of production, very large difference is arranged on performance and form.Studies show that, carbon plays skeleton function in the fusing of protective material, and adding of carbonaceous material is that fusing is most important to protective material, so join the important content that carbon is the development protective material.
| The type of carbon | Particle size/μ m | Ignition temperature/℃ |
| Carbon black | 0.028 | 386～522 |
| Coke blacking | 20 | 511～718 |
| Graphite | 74 | 613～897 |
| Fine graphite | 1.36 | 613～897 |
As can be seen from the above table, in various carbonaceous materials, the ignition temperature of carbon black is minimum, and the ignition temperature of graphitic carbon is the highest.In order to guarantee that protective material reaches stable three-decker in fusion process; reduce sintering, make the fusing of protective material uniform and stable, select mixing to join the carbon pattern so protective material is joined carbon; be specially the graphite proportioning of 14% carbon black and 6%; through the actual production test, this carbon pattern of joining is in using at the scene; in crystallizer, slag layer thickness is 10～12mm; without sintering, steel protective material consumption per ton is 0.3～0.5kg/t, can satisfy Production requirement.
By above-mentioned development test, design super large round billet continuous casting medium carbon steel privacy protection material, leading indicator such as following table
| SiO 2 | Al 2O 3 | CaO | F - | R 2O | C Gu | Fusing point/℃ | Viscosity/PaS | R value |
| 32.5 | 5.0 | 21.0 | 2.5 | 8.0 | 16.0 | 1090 | 1.0 | 0.63 |
According to the above table composition, show through site test results, when this protective material used, spreadability, heat insulating ability and meltdown property performance were good in crystallizer; Liquid slag layer thickness is 10～12mm, and slag consumption per ton is 0.35～0.45kg/t steel; In crystallizer, the surrounding heat output is stable and even, satisfies field requirement; Test slag slag bar is little, improved the inflow uneven phenomenon, and the protective material lubricity is good, has prevented sticker type breakout; Casting billet surface is without slag inclusion and dry slag phenomenon, the casting billet surface of pouring into a mould is more than 98% without the cleaning rate, strand is subcutaneous and internal soundness is good, all can satisfy the requirement of following needs Consideration: 1. the medium carbon steel high-temp plastic is relatively poor, in casting cycle, the interior base shell of crystallizer receives that frictional resistance is large, be prone to base shell and crystallizer wall bonding phenomenon, thus the emphasis of design protection design of material should be placed on guarantee lubricated on, Consideration of Heat Transfer secondly; 2. in order to reduce the frictional force of solidified shell, improve the lubricating ability of protective material, should use low basicity, full-bodied protective material; 3. protective material is joined carbon and is joined carbon for well with the mixing of carbon black and graphite.This protective material with above-mentioned result of study the present invention's production; field trial shows; the protective material of development melts in crystallizer evenly, the slag circle is few, and protective material sprawls well, without conglomeration, and heat-insulating property is good; during normal pulling rate, melt cinder thickness is 10～12mm; steel consumption per ton is 0.35～0.45kg, surrounding heat transfer stable and uniform in crystallizer, alarm free; casting billet surface reaches more than 98% without the cleaning rate, can satisfy the production requirement of steel mill's large round billet.
The specific embodiment
Embodiment 1:
The continuous-casting crystallizer especially used protective material of a kind of super large round billet medium carbon steel comprises that (pre-melt composition comprises pre-melt: SiO
228.0～33.0%, CaO 21.0～25.0%, Al
2O
36.0～9.0%, R
2O 3.0～7.0%, F
-2.5～6.0%), albite in powder, clinker, sodium carbonate, fluorite, iron oxide red, lithium carbonate, carbon black, 85 crystalline flake graphites; Its quality percentage composition is respectively 40.0%, 16%, 3%, 12.0%, 5.5%, 1%, 2.5%, 14%, 6%.
The effective ingredient of protective material is SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
230%, CaO 24%, Al
2O
33%, Na
2O 10%, F
-2%, MgO 4%, Fe
2O
31%.
Embodiment 2:
The continuous-casting crystallizer especially used protective material of a kind of super large round billet medium carbon steel comprises that (pre-melt composition comprises pre-melt: SiO
228.0～33.0%, CaO 21.0～25.0%, Al
2O
36.0～9.0%, R
2O 3.0～7.0%, F
-2.5～6.0%), albite in powder, clinker, sodium carbonate, fluorite, iron oxide red, lithium carbonate, carbon black, 85 crystalline flake graphites; Its quality percentage composition is respectively 40.0%, 16%, 3%, 12.0%, 5.5%, 1%, 2.5%, 14%, 6%.
The effective ingredient of protective material is for being SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
235%, CaO 18%, Al
2O
35%, Na
2O 6%, F
-4%, MgO 2%, Fe
2O
32%.
Embodiment 3:
The continuous-casting crystallizer especially used protective material of a kind of super large round billet medium carbon steel comprises that (pre-melt composition comprises pre-melt: SiO
228.0～33.0%, CaO 21.0～25.0%, Al
2O
36.0～9.0%, R
2O 3.0～7.0%, F
-2.5～6.0%), albite in powder, clinker, sodium carbonate, fluorite, iron oxide red, lithium carbonate, carbon black, 85 crystalline flake graphites; Its quality percentage composition is respectively 40.0%, 16%, 3%, 12.0%, 5.5%, 1%, 2.5%, 14%, 6%.
The effective ingredient of protective material is for being SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
232%, CaO 20%, Al
2O
34%, Na
2O 8%, F
-3%, MgO 3%, Fe
2O
31.5%.
Claims (3)
1. continuous-casting crystallizer especially used protective material of super large round billet medium carbon steel, it is characterized in that: its raw material comprises fritting material, albite in powder, clinker, sodium carbonate, fluorite, iron oxide red, lithium carbonate, carbon black, 85 crystalline flake graphites; Its quality percentage composition is respectively 40.0%, 16%, 3%, 12.0%, 5.5%, 1%, 2.5%, 14%, 6%, and described pre-melt composition comprises: SiO
228.0～33.0%, CaO 21.0～25.0%, Al
2O
36.0～9.0%, R
2O 3.0～7.0%, F
-2.5～6.0%.
2. continuous-casting crystallizer especially used protective material as claimed in claim 1, it is characterized in that: the effective ingredient of described protective material comprises SiO
2, CaO, Al
2O
3, Na
2O, F
-, MgO, Fe
2O
3, its quality percentage composition is SiO
229.5～35.5%, CaO 18.0～24.0%, Al
2O
33～5%, Na
2O 6.0～10.0%, F
-1.5～4.0%, MgO 1.5～4.0%, Fe
2O
30.5～2.5%.
3. continuous-casting crystallizer especially used protective material as claimed in claim 1, is characterized in that: the dual alkalinity (CaO/SiO of described protective material
2) be 0.55～0.75.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310310573XA CN103381473A (en) | 2013-07-23 | 2013-07-23 | Special protecting material for oversized round billet made of medium carbon steel for continuous casting mold |
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|---|---|---|---|
| CN201310310573XA CN103381473A (en) | 2013-07-23 | 2013-07-23 | Special protecting material for oversized round billet made of medium carbon steel for continuous casting mold |
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|---|---|
| CN103381473A true CN103381473A (en) | 2013-11-06 |
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ID=49489524
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|---|---|---|---|
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Cited By (4)
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| CN105772652A (en) * | 2016-03-23 | 2016-07-20 | 河南省西保冶材集团有限公司 | Special cleaner for molten iron ladle furnace liner and using method thereof |
| CN112620599A (en) * | 2020-12-29 | 2021-04-09 | 河南通宇冶材集团有限公司 | Ultralow-alkalinity high-vitrification protective slag for bloom medium-high carbon steel and preparation method thereof |
| CN113399630A (en) * | 2021-06-15 | 2021-09-17 | 阳春新钢铁有限责任公司 | Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed |
| CN114888249A (en) * | 2022-05-23 | 2022-08-12 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing sheet billet high-drawing-speed medium carbon steel and preparation method thereof |
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| CN112620599B (en) * | 2020-12-29 | 2022-04-08 | 河南通宇冶材集团有限公司 | Ultralow-alkalinity high-vitrification protective slag for bloom medium-high carbon steel and preparation method thereof |
| CN113399630A (en) * | 2021-06-15 | 2021-09-17 | 阳春新钢铁有限责任公司 | Function protection material for continuous casting crystallizer special for small square billet ultrahigh pulling speed |
| CN114888249A (en) * | 2022-05-23 | 2022-08-12 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing sheet billet high-drawing-speed medium carbon steel and preparation method thereof |
| CN114888249B (en) * | 2022-05-23 | 2024-05-10 | 首钢京唐钢铁联合有限责任公司 | Covering slag for producing medium carbon steel with high pulling speed of sheet billet and preparation method thereof |
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Application publication date: 20131106 |