CN105215309A - A kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls - Google Patents
A kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls Download PDFInfo
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Abstract
The present invention relates to a kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls, belong to field of steel metallurgy.Technical scheme of the present invention is: in casting process, and cast superheat of liquid steel is 25 DEG C ~ 35 DEG C, and pulling rate is 0.65m/min ~ 0.75m/min, carries out the pressure of 10mm ~ 14mm in casting blank solidification end; In casting process, the stirring intensity of the electromagnetic agitation of crystallizer position is 350A ~ 450A, stirring frequency is 2.3Hz ~ 2.5Hz, and the stirring intensity of solidification end position electromagnetic agitation is set as that 350A ~ 450A, stirring frequency are 6.8Hz ~ 7.2Hz.The present invention by controlling cast superheat of liquid steel, poring rate, solidification end pressure, then stirs pattern in conjunction with choose reasonable electricity, electricity stirs parameter, and the center segregation of big cross section heavy rail steel billet is effectively controlled, and all the other internal soundnesses of strand obtain effective guarantee.
Description
Technical field
The present invention relates to a kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls, belong to field of steel metallurgy.
Background technology
Rail is the main building block of railroad track, in railway transport course, provides and effectively supports and guide, need bear the huge lateral pressure from wheel to locomotive.Based on China's capital construction growth requirement, railway transportation just with the development of swift and violent speed, and is constantly tending towards high speed, heavy loading.Rail specification size also increases gradually, for reducing welding point, ensures the globality that railway track is higher, and the scale of large gauge rail is also in increase.Required that strand length scaling was longer undoubtedly by the former rail compared with the long scale of light section strand rolling large-size, this causes subsequent heat treatment equipment to need to carry out larger transformation; In addition, if casting blank cross-section size is constant, and rail specification size becomes large, and this impacts undoubtedly to the compression ratio of the operation of rolling, finally affects the physical indexs such as rail density.But big cross section Properties of Heavy Rail Steel continuous casting billet in generative process due to the factor of its steel grades itself and solidification of molten steel heat transfer theory, it is longer that slab cooling solidifies elapsed-time standards, it is larger that center segregation of casting blank controls difficulty, and this can have a negative impact to the rail quality of Properties of Heavy Rail Steel strand later stage rolling especially web of the rail quality.
Large quantity research is pointed out: the important method improving the control of strand degree of segregation improves strand density and casting blank solidification crystalline structure uniformity exactly.This mainly because, the main cause that center segregation of casting blank is formed is in slab cooling process of setting, along with the growth of column crystal, solute element is constantly separated out in interdendritic, cause interdendritic molten steel solute concentration apparently higher than dendrite concentration inside, and its liquidus temperature of the molten steel of high solute concentration is lower.Along with the growth of dendrite, the molten steel part of high solute concentration is pushed to strand center; In addition, strand center solidification shrinkage can cause it to the suction of molten steel, now because " bridging " causes top molten steel to be difficult to shrink casting blank solidification form effective feeding, and then cause the molten steel of interdendritic height solute concentration to be assembled to strand center, finally cause center segregation of casting blank degree obviously higher.Center segregation of casting blank can cause strand after being rolled into rail, and Line of Segregation appears in its web of the rail, affects rail quality.For the research that strand segregation controls, all one of research emphasis work that metallargist is constant all the time, in recent years along with the progress of science and technology, strand degree of segregation obtains and improves to a certain extent, but compared to more advanced overseas enterprise, control technology in this respect need further research.Especially constantly become large at casting blank cross-section size, strand segregation controls when difficulty constantly increases all the more so.
Such as: CN104525880A discloses the manufacture method of a kind of large section circle base.This invention comprises the following steps: 1) pour into a mould: molten steel is injected tundish from ladle; 2) crystallization: by the strand do not solidified completely obtained in the pouring molten steel of tundish to crystallizer, wherein, crystallizer protecting residue performance is: basicity 0.2 ~ 0.5, fusion temperature 980 ~ 1130 DEG C, and the viscosity at 1300 DEG C is 12 ~ 18.0PaS; It is as follows that M-EMS is set: electric current 400 ~ 500A, frequency 3.0 ~ 4.0Hz; 3) throwing: casting speed: 0.08 ~ 0.13m/min; 4) two is cold: two Leng Shang districts adopt full water to cool by force, and two cold inferior segments adopt air water to be atomized weak cooling, comprehensive specific water: 0.25 ~ 0.35L/kg steel; 5) strand after cold to two carries out continuous straightening, and aligning strain rate controls 0.08% ~ 0.13%.The present invention is the batch production realizing diameter 900mm and above round base based on a kind of arc radius 16.5 meters of full arc shape alloy steel continuous casting machines, and has good surface and internal soundness.But, the concrete technology of some keys of big cross section Properties of Heavy Rail Steel continuous casting billet center segregation control is not related to.
CN102806330A discloses a kind of method improving thick and large section continuous casting billet internal soundness, can solve thick and large section continuous casting billet central pipe in prior art and loosen and segregation problems.The present invention, by controlling Molten Steel Cleanliness, the cast degree of superheat, works in coordination with and adopts microcell vibration and solidify from Feeding, improve Inner Quality of Billet.Microcell oscillation technology effectively eliminates strand internal segregation defects, and can effective thinning solidification structure, alleviates shrinkage cavity and loosens.Solidify and in follow-up solidification shrinkage process, realize the plasticity of simultaneously solidifying with solid metallic from Feeding and move, the radial object from feeding of the deformable metal that reaches a high temperature, thus eliminate strand internal shrinkage, and significantly improve until eliminate strand internal defect.And the concrete technology of some keys of big cross section Properties of Heavy Rail Steel continuous casting billet center segregation control is not related to.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method providing big cross section Properties of Heavy Rail Steel center segregation of casting blank to control, and the center segregation of big cross section heavy rail steel billet can be made to be effectively controlled, and all the other internal soundnesses of strand obtain effective guarantee.
: in casting process that cast superheat of liquid steel is 25 DEG C ~ 35 DEG C, and pulling rate is 0.65m/min ~ 0.75m/min, carries out the pressure of 10mm ~ 14mm in casting blank solidification end for solving the problems of the technologies described above the technical solution adopted in the present invention; In casting process, the stirring intensity of the electromagnetic agitation of crystallizer position is 350A ~ 450A, stirring frequency is 2.3Hz ~ 2.5Hz, and the stirring intensity of solidification end position electromagnetic agitation is set as that 350A ~ 450A, stirring frequency are 6.8Hz ~ 7.2Hz.Carry out the press control of 10mm ~ 14mm in casting blank solidification end, central reduction can be weakened on the one hand and cause suction to high solute concentration molten steel, can realize providing dynamic conditions to the reallocation of solute in the high solute molten steel of part on the other hand.In casting process, target pull rate is usually pressed 0.70m/min and is controlled, and keeps constant speed cast.
Cast superheat of liquid steel is middle bag superheat of liquid steel, all the time 25 DEG C that meet the demands for making cast superheat of liquid steel ~ 35 DEG C, in casting process, the RH application of vacuum of the 1st heat terminates rear molten steel out-station temperature and controls to be 73 DEG C ~ 75 DEG C, and the RH application of vacuum of 2nd ~ N heat terminates rear molten steel out-station temperature and controls to be higher than liquidus temperature 55 DEG C ~ 65 DEG C.The RH application of vacuum of the 1st heat terminate rear molten steel out-station temperature control usually by 75 DEG C as target control.
The invention has the beneficial effects as follows: by controlling cast superheat of liquid steel, poring rate, solidification end pressure, stir pattern in conjunction with choose reasonable electricity again, electricity stirs parameter, the center segregation of big cross section heavy rail steel billet is effectively controlled, and all the other internal soundnesses of strand obtain effective guarantee.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
This embodiment is that certain steel mill adopts the technical method of this technological invention to produce big cross section (320mm*410) Properties of Heavy Rail Steel U75V continuous casting billet.Production process working control situation is: it is that middle bag first heat molten steel out-station temperature is 73 DEG C higher than liquidus temperature 57 DEG C ~ 65 DEG C that application of vacuum terminates rear molten steel out-station temperature.The actual degree of superheat control range of middle Baogang liquid is 26 DEG C ~ 35 DEG C, average 29 DEG C.The normal casting speed control of casting process, at 0.65m/min ~ 0.72m/min, keeps 0.70m/min (constant speed cast) ratio to reach 82.1%.The actual drafts of solidification end is 11.2mm.The stirring intensity of M-EMS is set as 450A, and stirring frequency is 2.4Hz; The stirring intensity of solidification end electromagnetic agitation is set as 350A, and stirring frequency is 7.0Hz.
After being poured, low power detection is carried out to Properties of Heavy Rail Steel U75V continuous casting billet, to detect Inner Quality of Billet, testing result display center segregation of casting blank is rated 0 ~ 0.5 grade, all the other quality index all meet the demands, and the Properties of Heavy Rail Steel of its level of control and production technology maturation produces section (280mm*380mm) quite.For the segregation of further clear and definite strand cross section controls situation, carry out the segregation of brill sample to strand and detect, sample position is distributed in each 5 points in strand wide direction, leptoprosopy direction center line and clinodiagonal and is uniformly distributed; 1, additional strand center point, altogether 16 points.Testing result show that strand carbon segregation degree entirety controls 0.95 ~ 1.08, and the section (280mm*380mm) of level of control and production technology maturation is suitable, even slightly more excellent.Follow the tracks of rail property detection to draw, steel rail web Line of Segregation is carefully short, and its density and remaining physical index thereof are effectively controlled, and all meet index request.
Embodiment 2
This embodiment is that certain steel mill adopts the technical method of this technological invention to produce big cross section (320mm*410) Properties of Heavy Rail Steel U71Mn continuous casting billet.Production process working control situation is: it is that middle Baogang liquid first heat out-station temperature is 73 DEG C higher than liquidus temperature 55 DEG C ~ 64 DEG C that application of vacuum terminates rear molten steel out-station temperature.The actual degree of superheat control range of middle Baogang liquid is 25 DEG C ~ 33 DEG C, average 31 DEG C.The normal casting speed control of casting process, at 0.68m/min ~ 0.75m/min, keeps 0.70m/min (constant speed cast) ratio to reach 80.7%.The actual drafts of solidification end is 10.2mm.The stirring intensity of M-EMS is set as 350A, and stirring frequency is 2.4Hz; The stirring intensity of solidification end electromagnetic agitation is set as 400A, and stirring frequency is 7.0Hz.
After being poured, low power detection is carried out to Properties of Heavy Rail Steel U71Mn continuous casting billet, to detect Inner Quality of Billet, testing result display center segregation of casting blank is rated 0 ~ 0.5 grade, all the other quality index all meet the demands, and the Properties of Heavy Rail Steel of its level of control and production technology maturation produces section (280mm*380mm) quite.For the segregation of further clear and definite strand cross section controls situation, carry out the segregation of brill sample to strand and detect, sample position is distributed in each 5 points in strand wide direction, leptoprosopy direction center line and clinodiagonal and is uniformly distributed; 1, additional strand center point, altogether 16 points.Testing result show that strand carbon segregation degree entirety controls 0.94 ~ 1.08, and the section (280mm*380mm) of level of control and production technology maturation is suitable, even slightly more excellent.Follow the tracks of rail property detection to draw, steel rail web Line of Segregation is carefully short, and its density and remaining physical index thereof are effectively controlled, and all meet index request.
Embodiment 3
This embodiment is that certain steel mill adopts the technical method of this technological invention to produce big cross section (320mm*410) Properties of Heavy Rail Steel U78CrV continuous casting billet.Production process working control situation is: it is that middle Baogang liquid first heat out-station temperature is 74 DEG C higher than liquidus temperature 57 DEG C ~ 63 DEG C that application of vacuum terminates rear molten steel out-station temperature.The actual degree of superheat control range of middle Baogang liquid is 26 DEG C ~ 34 DEG C, average 33 DEG C.The normal casting speed control of casting process, at 0.66m/min ~ 0.74m/min, keeps 0.70m/min (constant speed cast) ratio to reach 81.8%.The actual drafts of solidification end is 13.8mm.The stirring intensity of M-EMS is set as 400A, and stirring frequency is 2.4Hz; The stirring intensity of solidification end electromagnetic agitation is set as 400A, and stirring frequency is 7.0Hz.
After being poured, low power detection is carried out to Properties of Heavy Rail Steel U78CrV continuous casting billet, to detect Inner Quality of Billet, testing result display center segregation of casting blank is rated 0 ~ 0.5 grade, all the other quality index all meet the demands, and the Properties of Heavy Rail Steel of its level of control and production technology maturation produces section (280mm*380mm) quite.For the segregation of further clear and definite strand cross section controls situation, carry out the segregation of brill sample to strand and detect, sample position is distributed in each 5 points in strand wide direction, leptoprosopy direction center line and clinodiagonal and is uniformly distributed; 1, additional strand center point, altogether 16 points.Testing result show that strand carbon segregation degree entirety controls 0.95 ~ 1.09, and the section (280mm*380mm) of level of control and production technology maturation is suitable, even slightly more excellent.Follow the tracks of rail property detection to draw, steel rail web Line of Segregation is carefully short, and its density and remaining physical index thereof are effectively controlled, and all meet index request.
Above-mentioned embodiment explanation, after adopting this technological invention, big cross section (320mm*410mm) Properties of Heavy Rail Steel slab quality is effectively controlled, strand Central Carbon Segregation obtains effective guarantee especially, strand crystalline structure uniformity and strand density are obtained for effective control, further, the control of corresponding steel rail web Line of Segregation have also been obtained effective guarantee.
Claims (2)
1. a method for big cross section Properties of Heavy Rail Steel center segregation of casting blank control, is characterized in that: in casting process, and cast superheat of liquid steel is 25 DEG C ~ 35 DEG C, and pulling rate is 0.65m/min ~ 0.75m/min, carries out the pressure of 10mm ~ 14mm in casting blank solidification end; In casting process, the stirring intensity of the electromagnetic agitation of crystallizer position is 350A ~ 450A, stirring frequency is 2.3Hz ~ 2.5Hz, and the stirring intensity of solidification end position electromagnetic agitation is set as that 350A ~ 450A, stirring frequency are 6.8Hz ~ 7.2Hz.
2. the method for a kind of big cross section Properties of Heavy Rail Steel center segregation of casting blank control as claimed in claim 1, it is characterized in that: in casting process, it is 73 DEG C ~ 75 DEG C that the RH application of vacuum of the 1st heat terminates rear molten steel out-station temperature, and the RH application of vacuum of 2nd ~ N heat terminates rear molten steel out-station temperature higher than liquidus temperature 55 DEG C ~ 65 DEG C.
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Cited By (15)
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| CN106583676A (en) * | 2016-12-29 | 2017-04-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Carbon segregation control method for continuous casting round billet for vehicle wheel |
| CN106925738A (en) * | 2017-04-01 | 2017-07-07 | 唐山钢铁集团有限责任公司 | The method for improving low-alloy high-tensile structural steel wide thickness plate continuous casting base homogeneity |
| CN107737899A (en) * | 2017-10-27 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel continuous casting producing method |
| CN107790666A (en) * | 2017-10-27 | 2018-03-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel continuous casting control method |
| CN107812907A (en) * | 2017-10-27 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel green shell method of quality control |
| CN107812905A (en) * | 2017-10-27 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel green shell quality optimization control method |
| CN107812906A (en) * | 2017-10-27 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel crystallizer flow field control method |
| CN108705052A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous casting producing method of bloom pinion steel strand |
| CN108705055A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | M+F-EMS control method in bloom continuous casting |
| CN110216253A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel disperse is segregated control method |
| CN110216256A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Properties of Heavy Rail Steel tunneling boring homogenieity and web of the rail consistency control method |
| CN110238357A (en) * | 2019-07-22 | 2019-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Low rolling reduction Properties of Heavy Rail Steel web of the rail consistency control method |
| CN110280731A (en) * | 2019-07-22 | 2019-09-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel center solidified structure thinning method |
| CN110303124A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method |
| CN110508770A (en) * | 2019-07-22 | 2019-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel microsegregation control method |
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| CN106583676A (en) * | 2016-12-29 | 2017-04-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Carbon segregation control method for continuous casting round billet for vehicle wheel |
| CN106925738A (en) * | 2017-04-01 | 2017-07-07 | 唐山钢铁集团有限责任公司 | The method for improving low-alloy high-tensile structural steel wide thickness plate continuous casting base homogeneity |
| CN106925738B (en) * | 2017-04-01 | 2019-11-22 | 唐山钢铁集团有限责任公司 | The method for improving low-alloy high-tensile structural steel wide thickness plate continuous casting base homogeneity |
| CN107737899A (en) * | 2017-10-27 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel continuous casting producing method |
| CN107790666A (en) * | 2017-10-27 | 2018-03-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel continuous casting control method |
| CN107812907A (en) * | 2017-10-27 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel green shell method of quality control |
| CN107812905A (en) * | 2017-10-27 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel green shell quality optimization control method |
| CN107812906A (en) * | 2017-10-27 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel crystallizer flow field control method |
| CN108705055A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | M+F-EMS control method in bloom continuous casting |
| CN108705052A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous casting producing method of bloom pinion steel strand |
| CN110216253A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel disperse is segregated control method |
| CN110216256A (en) * | 2019-07-22 | 2019-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Properties of Heavy Rail Steel tunneling boring homogenieity and web of the rail consistency control method |
| CN110238357A (en) * | 2019-07-22 | 2019-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Low rolling reduction Properties of Heavy Rail Steel web of the rail consistency control method |
| CN110280731A (en) * | 2019-07-22 | 2019-09-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel center solidified structure thinning method |
| CN110303124A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method |
| CN110508770A (en) * | 2019-07-22 | 2019-11-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Bloom Properties of Heavy Rail Steel microsegregation control method |
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Application publication date: 20160106 |
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