CN100429020C - Protective slag for continuous casting medium thick plate of low alloy high strength steel - Google Patents
Protective slag for continuous casting medium thick plate of low alloy high strength steel Download PDFInfo
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- CN100429020C CN100429020C CNB2006100950635A CN200610095063A CN100429020C CN 100429020 C CN100429020 C CN 100429020C CN B2006100950635 A CNB2006100950635 A CN B2006100950635A CN 200610095063 A CN200610095063 A CN 200610095063A CN 100429020 C CN100429020 C CN 100429020C
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Abstract
The protecting slag for continuously cast medium and thick plate of low alloy high strength steel consists of carbon black 0.5-2.0 wt%, graphite 4-10 wt%, Na2O 4-12 wt%, F- 1-7 wt%, Al2O3 2-7 wt%, Fe2O3 1-3 wt%, crystallization controlling agent 7-20 wt%, Li2O 0-2 wt%, except CaO and SiO2, where the weight ratio CaO/SiO2 is 0.90-1.05. The crystallization controlling agent in the protecting slag is component capable of promoting the crystal separation of the molten protecting slag during condensation without deteriorating the lubricant characteristic seriously. The protecting slag of the present invention used in protecting continuously cast medium and thick plate of low alloy high strength steel, can raise the plate product quality and has no influence on the normal delivery of cast blank.
Description
Technical field
The present invention relates to a kind of covering slag that continuous cast crystallizer uses of making steel, relate in particular to the continuous casting covering slag of the cut deal of Hi-Stren steel.
Background technology
Two main tasks in the modern continuous casting technology development process enlarges continuous casting production kind exactly and realizes with high pulling rate being the high efficiency production of technical characterictic, send, redly send and directly rollingly further cut down the consumption of energy by strand heat.Stretch in the continuous casting process of formula mouth of a river covering slag cast in these employings, covering slag plays a part very important, and it has material impact to the direct motion of casting billet surface and subcutaneous quality and continuous casting process.As shown in Figure 1; covering slag to be double-deck by forming on crystallizer molten steel surface, the slag blanket structure of three layers or multilayer, plays to cover the molten steel face and reduce heat loss, intercept air and contact with molten steel and avoid the molten steel oxidation, absorb the field trash that floats in the molten steel and improve the meniscus cleanliness factor, be filled in and lubricate mobile strand in strand and the crystallizer gap and control the effect of strand to the heat transfer of crystallizer wall as heat transfer medium.Under normal casting process, the blemish on the strand, general main selection and improper use by covering slag caused.How effectively the research work of relevant continuous casting covering slag is around continuous casting kind and technology mostly, with regard to, bring into play above-mentioned five functions in phase and launch.
Hi-Stren steel continuous casting billet surface and the subcutaneous micro-crack that occurs easily, when the strand that has a this defective is used for rolled plate, on steel plate, easily form be full of cracks (drawing crack), this defective aborning slab (at steel industry, usually be thickness that the steel plate of 16～110mm calls cut deal) time the easier product that causes scrap on a large scale, cause when serious to produce to stop production.Adopt the coating crystallizer certain effect to be arranged, but how correct selective freezing device covering slag is to eliminate the harm of above-mentioned defective, is the important content of continuous casting worker research always to reducing this class defective.
The research work of carrying out mainly comprises:
(1) by experiment research and pilot production, clear and definite Hi-Stren steel continuous casting billet surface and the subcutaneous reason that occurs the micro-crack defective easily are: [C] is (weight %) 0.13～0.25, adds Mn, V, Nb, Ti, Al, the steel grade of components such as Mo is as 16Mn, 16MnR, Q345,15MnVN, 12Cr1MoV, HP295,20g (pot), X52, Hi-Stren steels such as X60, the solidified shell high-temp plastic is low, and thermal stress external frictional resistance big or that initial solidification shell is subjected to is big under the situation excessive in intensity of cooling, that inhomogeneous cooling is even, is easy to generate intercrystalline crack.
(2) having verified Hi-Stren steel continuous casting billet crizzle by pilot production causes the reason of stocking steel plate micro-crack to be: the Hi-Stren steel continuous casting billet with crizzle, when being used for SPHC production, because the compression ratio from the base to the material is big, crackle is wide along the surface of steel plate extension, depth as shallow, remove with the surface of steel plate oxide layer, micro-crack defective on the strand is little to final board quality harm like this, therefore, people have often ignored the micro-crack problem of Hi-Stren steel continuous casting billet.But, when above-mentioned strand is used for rolling cut deal, the strand thick as 210～300mm roll into 〉=during the thick steel plate of 16mm, micro-crack appears in surface of steel plate usually large tracts of land, cause that owing to clearing up putting in order fast steel plate scraps, scrappage reaches 25～30% every month when serious, through adopting method follow-up investigations such as continuous casting billet pickling, finds that the steel plate micro-crack is mainly caused by casting billet surface that produces in the crystallizer and subcutaneous micro-crack.
(3) adopt the coating crystallizer: on the ordinary mould copper plate working surface, plate one or more layers and contain the material of Cr-Zr alloy or Ni-Fe alloy, because of the thermal conductivity factor of the thermal conductivity ratio copper of these materials low, can reduce the intensity of cooling of initial solidification shell in crystallizer thus, make the strand temperature field uniform and stable, to reduce the thermal stress that the base shell is subjected to.Adopt the crystallizer coating technology, the cut deal steel plate crackle that can reduce the casting billet surface micro-crack and cause thus, but still the difficult harm of avoiding such defective to cause, the steel plate scrappage is still up to 11～17%.
(4) adopt high basicity high crystalline can covering slag: the heat that casting blank solidification discharges mainly conducts dual mode to the crystallizer wall transmission with radiation and heat by liquid and solid slag film; slag film heat-transfer capability is strong; make the strand intensity of cooling excessive and easily strengthen the thermal stress that the base shell is subjected to, the aggravation of strand crackle.Because form difference, covering slag may present crystalline state or vitreum state in process of setting.The slag film conduction heat transfer of glassy state and radiant heat transfer ability are all very strong, and the slag film of crystalline state is not only a little less than the radiant heat transfer ability, and the trickle hole of crystalline solid inside has effectively weakened the conduction heat transfer intensity of propagating by the thermal vibration mode, can make strand obtain more slowly cooling uniformly, can reduce the surface longitudinal crack of slab that brings out by thermal stress.Therefore, in actual production, people put Hi-Stren steel under the medium carbon steel classification, for avoiding surface longitudinal crack of slab, extensively adopt the covering slag of high basicity high crystalline energy, many covering slag basicity CaO/SiO
2Reaching 1.3～1.5, all is crystalline solid after solidifying, and crystallization temperature is above 1180 ℃ even 1200 ℃.But; crystalline solid covering slag slag many, that particularly crystallization temperature is high film; lubricant effect to strand is relatively poor, makes the low Hi-Stren steel strand of high-temp plastic big at the frictional resistance that the crystallizer middle and lower part is subjected to easily, produces intercrystalline crack and micro-crack along weakness zones such as strand oscillation marks.For reducing the loss that micro-crack is scrapped steel plate to cause; be forced to the covering slag that adopts the vitrifying characteristic good in the production; lubricated to strengthen strand; but surface longitudinal crack of slab increases the weight of again; the strand cleaning of need rolling off the production line; not only processing cost increases, and can't organize the heat of strand to send with red and send, and seriously reduces productivity ratio.Therefore,, how to coordinate contradiction lubricated and that control is conducted heat,, remained a problem that does not obtain satisfactorily resolving in the past in the present invention to produce the continuous casting billet of surface and subcutaneous equal flawless defective by covering slag at the Hi-Stren steel continuous casting.
Summary of the invention
At the deficiencies in the prior art; the technical problem to be solved in the present invention is, provides a kind of when the cut deal of continuous casting Hi-Stren steel, and this cut deal surface and subcutaneous basic flawless defective, scrappage are low; the cleaning of need not rolling off the production line again simultaneously can be saved the covering slag of post processing cost.
The scheme that solve the technical problem is a kind of like this cut deal continuous casting covering slag of Hi-Stren steel.The component of this covering slag (weight %) is: 0.63 carbon black, 7 graphite, 6.82 Na
2O, 2.14 F
-, 3.89 Al
2O
3, 2.18 Fe
2O
3, 14.81 crystal controlling agent, 0.41 Li
2O, all the other are CaO and SiO
2Wherein, CaO/SiO
2Be 0.96.Crystal controlling agent wherein is to promote the covering slag slag to separate out crystal and the composition of not serious deterioration covering slag lubrication property in condensation process.
Further, crystal controlling agent wherein is any one or any two sum or wantonly three kinds of sums or the four kinds of sums in barium compound, manganese compound, magnesium compound, the strontium compound.
Say that further this covering slag is the hollow bead slag, its granularity is 0.1～1.0mm.
Compared with prior art, crucial part of the present invention is each component when making accommodation, has added to promote the covering slag slag to separate out crystal and the crystal controlling agent of not serious deterioration covering slag lubrication property in condensation process in this covering slag.In this crystal controlling agent content range, can make the slag film that is positioned between strand and crystallizer wall both help controlling and the even solidification and heat transfer of strand, help reducing the frictional resistance that the base shell is subjected to again, so both avoid the Hi-Stren steel casting billet surface to produce longitudinal crack, avoided Hi-Stren steel casting billet surface and subcutaneous generation micro-crack again.So, when the cut deal of continuous casting Hi-Stren steel, can guarantee that not only scrappage is low, nor the cleaning of need rolling off the production line, can normally organize the heat of strand to send fully and send with red.
The present invention is further illustrated below in conjunction with accompanying drawing.
Description of drawings
Covering slag distribution schematic diagram in Fig. 1 crystallizer
The relation of Fig. 2 crystal controlling agent dosage and covering slag crystal property
The relation of Fig. 3 covering slag percent crystallization in massecuite and slab surface crack index
The relation of Fig. 4 covering slag crystallization temperature and slab surface crack index
In Fig. 1,1 is that crystallizer, 2 is that glass-film, 3 is that crystalline film, 4 is that melt cinder film, 5 is that slag circle, 6 is that stratum granulosum, 7 is that sinter layer, 8 is that molten slag layer, 9 is that molten steel, 10 is a solidified shell
The specific embodiment
A kind of cut deal continuous casting covering slag of Hi-Stren steel.The component of this covering slag (weight %) is: 0.5～2.0 carbon black, 4～10 graphite, 4～12 Na
2O, 1～7 F
-, 2～7 Al
2O
3, 1～3 Fe
2O
3, 7～20 crystal controlling agent, 0～2 Li
2O, all the other are CaO and SiO
2Wherein, CaO/SiO
2Be 0.90～1.05.
In covering slag of the present invention, CaO and SiO
2Be base-material, control covering slag basicity by their ratio.Purpose is covering slag slag film is controlled at the critical condition that changes into crystalline solid from glassy state, and slag film major part still is the vitreum state like this, help lubricated to strand, and the small part crystalline state helps controlling the uniformity of heat transfer.If basicity is low excessively, the slag film all is a vitreum, and heat-transfer capability is crossed the good general and caused surface longitudinal crack of slab serious, otherwise basicity is too high, and the slag film is a crystalline solid, casting billet surface and the subcutaneous micro-crack that occurs.
Al in covering slag of the present invention
2O
3, mainly bring in the covering slag by raw material.According to CaO-SiO
2-Al
2O
3Ternary phase diagrams, the Al of certain content
2O
3Help stablizing the physicochemical property of covering slag.
As casting Al
2O
3When being mingled with few steel grade, Al in the covering slag
2O
3Content can be controlled in (weight %) 4～7;
And as casting Al
2O
3When being mingled with more steel grade, Al in the covering slag
2O
3Content should be controlled at (weight %) 2～4.
In covering slag of the present invention, Na
2O, F
-And Li
2O is used for and CaO and SiO
2Acting in conjunction is that 1060～1180 ℃, 1300 ℃ following viscosity are 0.05～0.45PaS with the fusion temperature of control covering slag.Because Na
2O self fusing point (920 ℃) is lower, contains Li
2The lithium carbonate fusing point of O (720 ℃) is lower, in covering slag with CaO and SiO
2Low melting point eutectic be can form, thereby the fusion temperature of covering slag, F reduced
-Then interrupt complicated silica anion radical structure, make slag micro unit size decreases be easy to migration, reduce covering slag viscosity thus by replacing the bridging oxygen position.
The casting speed of determining when continuous casting process is 0.70～1.3m/min, and covering slag fusion temperature and viscosity are got the middle upper limit, Na in above-mentioned scope
2O, Li
2O and F
-Content is value between the middle limit of the present invention regulation and lower limit;
And the casting speed of determining when continuous casting process is 1.3～1.7m/min, and covering slag fusion temperature and viscosity are got lower limit in above-mentioned scope, Na
2O, Li
2O and F
-Content is value between the middle limit of the present invention regulation and the upper limit.
In covering slag of the present invention, carbon black and graphite are mainly used in molten slag layer structure and the burn-off rate of controlling covering slag, and the covering slag that adapts with casting speed consumption is provided, and obtain the covering slag behaviour in service that the slag bar is few, fusing is even, liquid level is active.Other composition can be brought into play good skeleton buffer action through mechanical lapping or alr mode mixing in carbon black, graphite and the covering slag.
In covering slag of the present invention, crystal controlling agent is meant and can promotes the covering slag slag to separate out crystal and the main component of not serious deterioration covering slag lubrication property in condensation process.They are any one or any two sum or wantonly three kinds of sums or four kinds of sums in barium compound, manganese compound, magnesium compound, the strontium compound---when this crystal controlling agent was formed for two or more compound, the molal quantity of each compound equated.
Chamber checking by experiment; obtain the crystal controlling agent dosage covering slag crystallization temperature and percent crystallization in massecuite influenced the rule (see figure 2); further by producing checking; find when the covering slag crystallization temperature be 1100～1160 ℃, when percent crystallization in massecuite is 20～60%; Hi-Stren steel surface longitudinal crack of slab exponential sum micro-crack index minimum (seeing Fig. 3, Fig. 4), casting billet surface and subcutaneous essentially no defective.The rational crystal controlling agent dosage that complex chart 2, Fig. 3, Fig. 4 result obtain suitable Hi-Stren steel continuous casting covering slag is (weight %) 7～20; in this content range; can make the slag film that is positioned between strand and crystallizer wall both help controlling and the even solidification and heat transfer of strand; help reducing the frictional resistance that the base shell is subjected to again; so both avoided the Hi-Stren steel casting billet surface to produce longitudinal crack; avoided Hi-Stren steel casting billet surface and subcutaneous generation micro-crack again, created primary condition for producing the zero defect strand.
In this specific embodiment, covering slag of the present invention is the hollow bead covering slag, and each composition is mixed in gyratory agitation device, and atomization drying is shaped in spray drying tower, and making granularity is the pre-melted type hollow bead covering slag of 0.1～1.0mm.
In view of those skilled in the art is doing a large amount of work aspect the research of the cut deal continuous casting covering slag of Hi-Stren steel, aspect theory and practice, all accumulate a large amount of, rich experience.Therefore; after conscientiously having read this specific embodiment and corresponding analysis the thereof; one surely according to other actual conditions; in the scope of component that the present invention proposes and corresponding proportion thereof; (doing the test of limited several times routine at the most again) select one group of covering slag prescription that satisfies other conditions particularly, realizing the present invention, and reach technique effect of the present invention.So, below only enumerate the checking embodiment an of the best.
This checking embodiment verifies that in continuous casting crystallizer for plate billet the comparative example 1 and the comparative example 2 of contrast usefulness are two kinds of existing covering slags.
The Hi-Stren steel chemical composition (weight %) of casting is: C (0.15), Si (0.42), Mn (1.46), P (0.017), S (0.023), all the other are Fe and micro-constituent elements such as Al, Ti, casting speed is 0.80～1.30m/min, and rolled plate thickness is 16～32mm.The scrappage of calculating by weight when statistics surface longitudinal crack of slab exponential sum strand is rolled into cut deal.
Table 1 has provided surface longitudinal crack of slab and the rolled plate scrappage result of chemical composition, main performance and the casting of embodiment, comparative example 1, comparative example 2 covering slags.The surface longitudinal crack of slab of embodiment and the casting of comparative example 1 covering slag is minimum, and their longitudinal crack index is minimum; It is minimum that the strand rolled plate of embodiment and comparative example 2 covering slag productions moves back useless rate.Comparative example 1 covering slag is owing to basicity height, percent crystallization in massecuite and crystallization temperature height, though surface longitudinal crack of slab is few, rolled plate moves back useless rate up to 12.36%, has seriously reduced product percent of pass; And comparative example 2 covering slag percent crystallization in massecuites and crystallization temperature are low, though that the strand rolled plate moves back useless rate is low, surface longitudinal crack of slab is serious, and the cleaning of must rolling off the production line has a strong impact on the optimization of production procedure and carries out smoothly.Have only the embodiment covering slag to improve cc billet surface quality and rolled plate quality simultaneously, eliminated surface longitudinal crack of slab defective and micro-crack defective simultaneously, solved covering slag and promoted contradiction lubricated and that control is conducted heat.
Table 1 embodiment and comparative example covering slag chemical composition (weight %),
Main performance and a strand surface longitudinal crack that waters and rolled plate scrappage
Claims (4)
1, a kind of cut deal continuous casting covering slag of Hi-Stren steel is characterized in that the component (weight %) of this covering slag is: 0.63 carbon black, 7 graphite, 6.82 Na
2O, 2.14 F
-, 3.89 Al
2O
3, 2.18 Fe
2O
3, 14.81 crystal controlling agent, 0.41 Li
2O, all the other are CaO and SiO
2Wherein, CaO/SiO
2Be 0.96.
2, the cut deal continuous casting covering slag of Hi-Stren steel according to claim 1; it is characterized in that described crystal controlling agent is any one or any two sum or wantonly three kinds of sums or the four kinds of sums in barium compound, manganese compound, magnesium compound, the strontium compound.
According to the cut deal continuous casting covering slag of the Hi-Stren steel described in the claim 2, it is characterized in that 3, when described crystal controlling agent was two or more compound composition, the molal quantity of each compound equated.
4, according to the cut deal continuous casting covering slag of the Hi-Stren steel described in the claim 1,2 or 3, it is characterized in that this covering slag is the hollow bead slag, its granularity is 0.1～1.0mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100950635A CN100429020C (en) | 2006-08-25 | 2006-08-25 | Protective slag for continuous casting medium thick plate of low alloy high strength steel |
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|---|---|---|---|
| CNB2006100950635A CN100429020C (en) | 2006-08-25 | 2006-08-25 | Protective slag for continuous casting medium thick plate of low alloy high strength steel |
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| CN1911560A CN1911560A (en) | 2007-02-14 |
| CN100429020C true CN100429020C (en) | 2008-10-29 |
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|---|---|---|---|
| CNB2006100950635A Expired - Fee Related CN100429020C (en) | 2006-08-25 | 2006-08-25 | Protective slag for continuous casting medium thick plate of low alloy high strength steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102814479A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Continuous casting crystallizer protective dregs for carburizing steel and manufacturing method thereof |
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|---|---|---|---|---|
| CN101637808B (en) * | 2009-08-11 | 2012-03-07 | 河南省西保冶材集团有限公司 | ASP medium thickness slab high drawing speed plate blank low-carbon steel continuous casting functional protective material |
| CN102085568B (en) * | 2009-12-04 | 2012-11-07 | 丹东泓辉科大高温材料有限公司 | Peritectic steel continuous casting covering slag |
| CN102009146B (en) * | 2010-12-08 | 2013-09-11 | 西峡龙成冶金材料有限公司 | Carbon steel continuous casting powder in phi 700-800mm round billet |
| CN102756103B (en) * | 2012-08-10 | 2014-10-08 | 重庆大学 | Crystallizer casting powder for high-crystallinity high-lubricity continuous casting |
| KR102179557B1 (en) * | 2018-10-29 | 2020-11-16 | 주식회사 포스코 | Mold and casting method |
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| CP03 | Change of name, title or address |
Address after: 114000 Liaoning city of Anshan province Taian County Industrial Park Patentee after: Liaoning Tianhe Technology Co., Ltd. Address before: Taian County in Liaoning province 114100 Industrial Zone Patentee before: Liaoning Tianhe Minerals Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20200825 |
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| CF01 | Termination of patent right due to non-payment of annual fee |