CN102009145A - Function protecting material of specific continuous casting crystallizer of 510L automotive beam steel - Google Patents
Function protecting material of specific continuous casting crystallizer of 510L automotive beam steel Download PDFInfo
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- CN102009145A CN102009145A CN 201010247666 CN201010247666A CN102009145A CN 102009145 A CN102009145 A CN 102009145A CN 201010247666 CN201010247666 CN 201010247666 CN 201010247666 A CN201010247666 A CN 201010247666A CN 102009145 A CN102009145 A CN 102009145A
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Abstract
The invention discloses a function protecting material of a specific continuous casting crystallizer of 510L automotive beam steel. The function protecting material comprises the following components in percentage by weight: 2.0-3.5 percent of Li2O, 3.0-6.0 percent of MgO, 1.35-1.45 percent of binary basicity (CaO/SiO2), 25.0-32.0 percent of SiO2, 35.0-42.0 percent of CaO, less than 5 percent of Al2O3, 6.0-9.0 percent of Na2O, 8.0-10.0 percent of F- and lea than 1.5 percent of k2O. The function protecting material has good spreadability, good heat insulating ability and good melting property in the crystallizer, four surfaces have stable and even heat transferring quantity in the crystallizer, the thickness of a liquid slag layer is 8-12mm, slag strips are few, the function protecting material has good lubricating property and prevents sticking breakout, and a cast blank surface has no longitudinal crack phenomenon and good quality.
Description
Technical field:
The invention belongs to the metallurgic auxiliary materials technical field, the continuous-casting crystallizer especially used function protective material of particularly a kind of 510L beam steel.
Background technology:
The hot rolling beam steel is mainly used in all kinds of commercial car field, is used to make heavily the crossbeam of various lorries such as card, light card, pick up and passenger vehicle, comprises longitudinal and cross beam.Present employed beam steel mainly is 420L, 510L and 610L, and low-level beam steel substantially is eliminated, and the high-strength steel of yield strength more than 700Mpa is also at the experimental stage in most of enterprise.Corresponding with the high speed development of automobile industry, the market demand of beam steel also kept rapid growth situation in recent years, wherein finished 610,000 tons in 2005, finished 720,000 tons in 2006, finished 1,000,000 tons in 2007, finished 1,230,000 tons in 2008.But in the beam steel buying, 510L and 610L are mainly used in and heavily block on the automobile, then relatively general for selecting for use of middle card and light card material, material is mainly based on Q235, Q345B etc., even the use of 420L and 510L is arranged, consumption is also less relatively, and therefore, the development that heavily blocks automobile industry directly influences 510L and the consumption situation of 610L in market.
The whole nation was heavily blocked automobile production total amount (containing tractor) and is respectively 230,000 from 2005 to 2008, and 310,000,490,000,540,000, heavily blocked the automobile production total amount in 2009 and estimate the whole year and increase by 5%～10% on a year-on-year basis, promptly realize 56～600,000.The amount of each heavy card automobile beam steel that uses in producing vehicle frame is at 0.8～1.2 ton, heavily blocked industry main engine plants beam steel use amount in promptly 2009 about 600,000 tons, but consider the consumption of automobile repacking enterprise (or special-purpose vehicle industry) beam steel in making the auxiliary girder process, the beam steel consumption was more than 900,000 tons in 2009, along with replacing original Q235B and Q345B with thin size high-tensile steel in the automobile loss of weight process, the high-strength and strong beam steel consumption of superelevation can increase sharply.
Along with developing of automobile industry, be to improve the bearing capacity of automobile, prolong requirements such as automotive service life and energy-conservation, material-saving and safety traffic, produce the automobile frame crossbeam with hot-rolled low-alloy high strength and ultrahigh-strength steel plates, become development trend.Using at present the strong beam steel yield strength of superelevation more than 700MPa, be mainly used on the automobile loss of weight, attaches most importance on truck frame and the car body in the loss of weight position, and loss of weight weight is more than 1 ton.More present main engine plants and special-purpose vehicle manufacturing enterprise large usage quantity, the above market consumption of the strong 700MPa of following superelevation will progressively amplify.
According to the energetically support of country to environment-friendly energy-saving automobile, the car of the type system will more and more be promoted in the future, therefore present each truck production firm just is being conceived to the loss of weight of truck, and more the beam steel material of high strength and thinner specification will obtain favor in future.
510L is widely used in the girder, crossbeam, reinforcement of automobiles such as truck, light card, SUV etc.General thickness is 3～14mm.510L is a GB, and wherein numeral 510 is represented minimum tensile strength (N/mm2), and L represents the first phonetic alphabet " L " of " beam " in the beam steel.
Shoudu Iron and Steel Co Jing Tang Iron And Steel Co., Ltd begins to produce the 510L beam steel from February, 2010, section is that 230 * (1100-2150) pulling rates are: 0.8-1.3 rice/min, molten steel composition is as above shown.
The particularity of 510L steel grade is exactly that this steel grade very easily causes the slab longitudinal crack.In order to obtain satisfied product quality.Therefore to function protective material performance demands also unusual strictness, function protective material lubricates guaranteeing, improves and slows down heat transfer, the field trash in the absorption molten steel.Also must guarantee to accomplish following some: 1) stable liquid slag layer thickness, the size of liquid slag layer thickness can influence defectives such as casting billet surface cracks.2) avoid the slag circle to generate, the slag circle influences the uniformity that the slag film imports, and also can the passage that melt cinder flows downward be blocked, and influences the semifinished product Homogeneouslly-radiating, and lobe appears in surface easily; 3) good spreadability and gas permeability makes the formation three-decker that bits can be very fast in crystallizer, guarantees the uniformity of the inflow of slag film.4) suitable slag consumption is fully filled the slit between semifinished product and the crystallizer, and is reached desirable slag film thickness, comes the convection heat transfer' heat-transfer by convection between slow semifinished product and the crystallizer; 5) lower viscosity coefficient of dross, because the shrinkage character of 510L steel grade causes semifinished product in the process of solidification shrinkage, and the air gap that forms between the crystallizer, the air gap that forms than general peritectic steel is big.Corresponding hot the transmission also just soon must pass through to form enough thick heat insulating belt between the even and too much inflow slit of melt cinder film like this, influences semifinished product and slowly conducts heat, and avoids too fast heat conduction, lobe occurs.
Summary of the invention:
The purpose of this invention is to provide a kind of is that novel 510L Peritectic Alloy steel solves strand base surface lobe phenomenon, and the continuous-casting crystallizer especially used function protective material of specially developing of a kind of 510L beam steel.
For realizing purpose of the present invention, the continuous-casting crystallizer especially used function protective material of described 510L beam steel, its raw material comprise melting charge, thin glass dust, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black.Its weight percentage is respectively 66.0%, 4.0%, 3.5%, 17.0%, 5.0%, 3.0%, 1.5%, and the composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2O
3Be not more than 1%, Al
2O
34～6%, Na
2O 5～7%, F
-2～4%.
In the described function protective material, Li
2The O weight percentage is 2.0～3%, and the MgO weight percentage is 3.0～6.0%, dual alkalinity (CaO/SiO
2) be 1.35～1.45%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its weight percentage is SiO
225.0～32.0%, CaO 35.0～42.0%, Al
2O
3＜5%, Na
2O 6.0～9.0%, F
-8.0 k～10.0%,
2O＜1.5%.
Below by embodiment, the invention will be further described:
510L is tangible inferior Peritectic Alloy steel.The characteristics of this type of steel grade are carbon contents 0.10%, are in inferior peritectoid district, and the generation peritectoid is sent out should.Be accompanied by bigger linear shrinkage and S elements segregation in the course of reaction, gap between volume contraction post crystallization device and base shell is big, make that the initial shell thickness that forms is inhomogeneous in crystallizer, thermal stress makes the weakness of base shell crack, strand goes out the chilling that is subjected to two cold water sprays behind the crystallizer, and the expansion that keeps in two cold-zones.Cause the generation of the red brittleness aggravation crackle of steel grade behind the S element segregation.
Mn content 1.4%, the Mn element has the characteristics of typical flash heat transfer, so this steel grade very easily causes the strand crackle soon because of Mn content high heat transfer.Nb content is mainly used in the steel grade microalloying, improves the intensity of steel grade.But the N in Nb element and the molten steel (C) element is sent out and should be generated NbNC, separates out in the casting blank solidification process.The NbNC that separates out increases the fragility of steel grade, is another major reason that causes the slab crackle.
The design of function protective material chemical composition.At first require the dual alkalinity (CaO/SiO of function protective material
2) must reach more than 1.3; resemble to guarantee that the slag film forms thick crystallization in the crystallizer; improve the heat transfer between base shell and the crystallizer; in order to conduct heat in the crystallization control device; the peritectic steel function protective material should select basicity height, crystallization temperature height and crystallization than big function protective material; under the condition that does not influence crystallization temperature and crystallization ratio, reduce setting temperature to greatest extent, simultaneously to improve the lubricant effect of slag film.
Crystallization temperature is lubricated in crystallizer and conducted heat function protective material all bigger influence.This is to form solid slag film and liquid slag blanket between crystallizer and the base shell because the melt cinder of function protective material fusing flows into, when crystallization temperature is high, just separate out high-melting-point crystal such as wollastonite, sodium, submellite and cuspidine in the melt cinder easily, thereby influence the greasy property of function protective material; Simultaneously, in the solid slag film, separate out a large amount of crystal matter and increased the thermal resistance that slag film heat transmits.When crack sensitive steels such as cast peritectic steel; reduce the crystallization temperature that purpose that crystallizer conducts heat can suitably improve function protective material in order to reach, but because slag film lubrication degradation, the bonding probability increases; therefore, peritectic steel function protective material viscosity is little than other slag.
Crystallization is than just being meant the percentage of separating out crystal in the solid slag film, can be used for the greasy property and the heat-transfer capability of representation function protective material.This is because constantly there is crystal to separate out in the forming process of solid slag film, in the solid slag film that forms many spaces is arranged because volume contraction makes, thereby the heat transfer resistance that has increased function protective material has reached the effect that control is conducted heat; Simultaneously because the lubricating ability of crystal plasma membrane not as the glass plasma membrane, will influence the greasy property of function protective material when the crystal plasma membrane is thicker, to reach the lubricated effect of control.Basicity has tangible influence to function protective material crystallization ratio, and along with the rising of basicity, the percent crystallization in massecuite of function protective material also is significantly improved.Just need the percent crystallization in massecuite of suitable increase function protective material to control the heat-transfer effect of function protective material for crack sensitive steels such as cast peritectic steels, reduce the possibility that lobe takes place.
The present invention controls the dual alkalinity of function protective material in 1.35～1.45 scopes.Secondly, adopt method regulatory function protective material fusing point and viscosity, the wherein Li of multiple flux
2O is an important flux, and is remarkable to reducing function protective material viscosity and fusing point, simultaneously Li
2O can also improve the heat endurance of function protective material.Li in the function protective material of the present invention
2O content control range is 2.0～3.0%; 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, helps 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 content control range is 6.0～7.0%, Na
2O remains reduction fusing point and viscosity in the effect of function protective material; It is to reduce slag viscosity that F-in the function protective material mainly acts on, and improves the melt cinder flowability, but will pay special attention to control the F-content in the function protective material in the present invention, if 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
-Ion concentration is too high also can to cause serious erosion to stretching into the formula mouth of a river, reduces mouth of a river service life, and for this reason, F-content control range is 7.0～8.5% in the function protective material of the present invention.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 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 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 content control range is 12.0～15.0% 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 lower fusing point, viscosity, setting temperature and burn-off rate faster.Requirement specifically is set is: fusing point (hemisphere point temperature) is 1120～1170 ℃; 1300 ℃ viscosity is 0.05～0.06PaS; Setting temperature is 1120～1190 ℃ (temperature-viscosity curve judgements); Burn-off rate is 35～45 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 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 melting charge 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.Particularly preliminary melting type continuous casting slag base-material ratio has reached 60～70%, has reduced the decomposition combination reaction process in crystallizer, has obviously increased the stability of result of use.
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 510L special 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 250 orders; 2) mixing stirs and each 1 hour water mill pulping time.
This function protective material that adopts above-mentioned result of study to produce is No. 1, Shoudu Iron and Steel Co Jing Tang Iron And Steel Co., Ltd.Pour into a mould on No. 2 Da Nieli slab casters: section is the mm of 230mm * (1100-2150), the 510L beam steel, and pulling rate is 0.55kg/T steel, molten steel surface liquid slag layer thickness 10-12mm in 0.8-1.3m/min. slag consumption.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; Thermography is stable.Test slag slag bar is little, 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. and slag inclusion and dry slag phenomenon, cc billet surface quality is good.
The specific embodiment
Embodiment:
The continuous-casting crystallizer especially used function protective material of a kind of 510L beam steel, its raw material comprise melting charge, thin glass dust, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black.Its weight percentage is respectively 66.0%, 4.0%, 3.5%, 17.0%, 5.0%, 3.0%, 1.5%, and the composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2O
3Be not more than 1%, Al
2O
34～6%, Na
2O 5～7%, F
-2～4%.
In the described function protective material, Li
2The O weight percentage is 2.2%, and the MgO weight percentage is 5.0%, dual alkalinity (CaO/SiO
2) be 1.43%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its weight percentage is SiO
225.8%, CaO 37%, Al
2O
34.5%, Na
2O 8.4%, F
-8.2%, k
2O 1.3%.
Embodiment two:
The continuous-casting crystallizer especially used function protective material of a kind of 510L beam steel, its raw material comprise melting charge, thin glass dust, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black.Its weight percentage is respectively 66.0%, 4.0%, 3.5%, 17.0%, 5.0%, 3.0%, 1.5%, and the composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2O
3Be not more than 1%, Al
2O
34～6%, Na
2O 5～7%, F
-2～4%.
In the described function protective material, Li
2The O weight percentage is 2.9%, and the MgO weight percentage is 3.5%, dual alkalinity (CaO/SiO
2) be 1.23%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its weight percentage is SiO
231.0%, CaO 38.0%, Al
2O
31.5%, Na
2O 6.5%, F
-9.6%, k
2O 0.5%.
Embodiment three:
The continuous-casting crystallizer especially used function protective material of a kind of 510L beam steel, its raw material comprise melting charge, thin glass dust, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black.Its weight percentage is respectively 66.0%, 4.0%, 3.5%, 17.0%, 5.0%, 3.0%, 1.5%, and the composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2O
3Be not more than 1%, Al
2O
34～6%, Na
2O 5～7%, F
-2～4%.
In the described function protective material, Li
2The O weight percentage is 2.5%, and the MgO weight percentage is 4.5%, dual alkalinity (CaO/SiO
2) be 1.33%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its weight percentage is SiO
228.5%, CaO 38.0%, Al
2O
32.5%, Na
2O 7.5%, F
-9.0%, k
2O 0.75%.
Claims (2)
1. continuous-casting crystallizer especially used function protective material of 510L beam steel is characterized in that: its raw material comprises melting charge, thin glass dust, sodium carbonate, fluorite, ice crystal, lithium carbonate, carbon black.Its weight percentage is respectively 66.0%, 4.0%, 3.5%, 17.0%, 5.0%, 3.0%, 1.5%, and the composition and the percentage by weight of described melting charge consist of: SiO
242～45%, CaO 36～39%, MgO 1.5～3.5%, Fe
2O
3Be not more than 1%, Al
2O
34～6%, Na
2O 5～7%, F
-2～4%.
2. the continuous-casting crystallizer especially used function protective material of 510L beam steel as claimed in claim 1 is characterized in that: in the described function protective material, and Li
2The O weight percentage is 2.0～3%, and the MgO weight percentage is 3.0～6.0%, dual alkalinity (CaO/SiO
2) be 1.35～1.45%, all the other are SiO
2, CaO, Al
2O
3, Na
2O, F
-, its weight percentage is SiO
225.0～32.0%, CaO 35.0～42.0%, Al
2O
3＜5%, Na
2O 6.0～9.0%, F
-8.0 k～10.0%,
2O＜1.5%.
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Cited By (7)
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| CN102527964A (en) * | 2012-02-22 | 2012-07-04 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer protective material special for steel plates with yield strength of over 390MPa |
| CN102554163A (en) * | 2012-02-22 | 2012-07-11 | 河南省西保冶材集团有限公司 | Energy-saving and environment-friendly protecting material for slab continuous casting mold |
| CN102615259A (en) * | 2012-04-10 | 2012-08-01 | 河南省西保冶材集团有限公司 | Protective material for non-oriented clean silicon steel continuous casting crystallizer for nuclear power unit |
| CN103381475A (en) * | 2013-07-23 | 2013-11-06 | 河南省西保冶材集团有限公司 | Continuous casting crystallizer protective material dedicated for high-corrosion-resistance Mn steel for oil platform |
| CN103381474A (en) * | 2013-07-26 | 2013-11-06 | 河南省西保冶材集团有限公司 | Special continuous casting mold protection material for bearing steel |
| CN104588602A (en) * | 2015-02-27 | 2015-05-06 | 河南省西保冶材集团有限公司 | Function protection material of special continuous casting crystallizer for internal combustion engine intake valve steel |
| CN108465791A (en) * | 2018-07-09 | 2018-08-31 | 西峡龙成冶金材料有限公司 | A kind of low nickel high-nitrogen austenitic stainless steel continuous crystallizer protecting slag |
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| CN103381475B (en) * | 2013-07-23 | 2015-09-30 | 河南省西保冶材集团有限公司 | The continuous-casting crystallizer especially used protective material of corrosion-resistant high Mn steel used for oil platform |
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| CN103381474B (en) * | 2013-07-26 | 2015-06-10 | 河南省西保冶材集团有限公司 | Special continuous casting mold protection material for bearing steel |
| CN104588602A (en) * | 2015-02-27 | 2015-05-06 | 河南省西保冶材集团有限公司 | Function protection material of special continuous casting crystallizer for internal combustion engine intake valve steel |
| CN108465791A (en) * | 2018-07-09 | 2018-08-31 | 西峡龙成冶金材料有限公司 | A kind of low nickel high-nitrogen austenitic stainless steel continuous crystallizer protecting slag |
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