CN105364042A - Method for controlling crystalline structure uniformity of large-section heavy rail steel cast blank - Google Patents
Method for controlling crystalline structure uniformity of large-section heavy rail steel cast blank Download PDFInfo
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- CN105364042A CN105364042A CN201510765692.3A CN201510765692A CN105364042A CN 105364042 A CN105364042 A CN 105364042A CN 201510765692 A CN201510765692 A CN 201510765692A CN 105364042 A CN105364042 A CN 105364042A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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Abstract
本发明涉及一种大断面重轨钢铸坯结晶组织均匀性控制的方法，属于钢铁冶金领域。本发明的技术方案为：在浇注过程中，浇注钢液过热度为20℃～30℃，拉速为0.68m/min～0.72m/min；在连铸过程中，结晶器位置处的电磁搅拌的搅拌强度为350A～450A、搅拌频率为2.3Hz～2.5Hz，凝固末端位置处电磁搅拌的搅拌强度设定为350A～550A、搅拌频率为6.8Hz～7.2Hz。本发明通过控制浇注钢液过热度、浇注速度，再结合合理选择电搅模式、电搅参数，使得大断面重轨钢坯结晶组织均匀性得到有效保障，铸坯内部质量得到有效控制。The invention relates to a method for controlling the uniformity of the crystallization structure of a large-section heavy rail steel slab, belonging to the field of iron and steel metallurgy. The technical scheme of the present invention is as follows: during the casting process, the superheat degree of the pouring molten steel is 20°C to 30°C, and the casting speed is 0.68m/min to 0.72m/min; during the continuous casting process, the electromagnetic stirring at the mold position The stirring intensity is 350A-450A, the stirring frequency is 2.3Hz-2.5Hz, the stirring intensity of the electromagnetic stirring at the solidification end position is set at 350A-550A, and the stirring frequency is 6.8Hz-7.2Hz. In the present invention, by controlling the superheat degree and pouring speed of pouring molten steel, combined with reasonable selection of electric stirring mode and electric stirring parameters, the uniformity of crystallization structure of large-section heavy rail billet is effectively guaranteed, and the internal quality of casting billet is effectively controlled.
Description
Technical field
The present invention relates to a kind of method of big cross section Properties of Heavy Rail Steel strand crystalline structure uniformity controlling, 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 is due to the factor of its steel grades itself and solidification of molten steel heat transfer theory in generative process, and the trend of strand column crystal prosperity is larger, and this can cause harmful effect to strand crystalline structure uniformity.
Large quantity research is pointed out: the effective measures improving strand density and casting blank solidification crystalline structure uniformity improve strand proportion of equiaxed grain exactly.This mainly because, in casting blank solidification process, after " chill " is formed, the directionality of casting blank solidification heat transfer promotes the formation of column crystal and grows up, if do not controlled, the prosperity of column crystal must have influence on the control of strand segregation, reduce strand equiaxial crystal ratio, worsen casting blank solidification crystalline structure uniformity, more seriously when solidify develop into close to strand center time, the prosperity of column crystal can cause the generation of " bridging ", and then cause molten steel cannot to the volume contraction caused due to cooled and solidified supplement, and then affect casting blank solidification dense structure property, reduce Inner Quality of Billet, finally affect rail quality, especially the density of web of the rail position.And for the control that strand crystalline structure uniformity promotes, be all one of research emphasis work that metallargist is constant all the time, especially constantly become large at casting blank cross-section size, all the more so when crystalline structure uniformity control difficulties constantly increases.
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 crystalline structure uniformity controlling 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 crystalline structure uniformity controlling 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 strand crystalline structure uniformity controlling, and big cross section heavy rail steel billet crystalline structure uniformity can be made to obtain effective guarantee, and Inner Quality of Billet is effectively controlled.
: in casting process that cast superheat of liquid steel is 20 DEG C ~ 30 DEG C, and pulling rate is 0.68m/min ~ 0.72m/min 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 ~ 550A, stirring frequency are 6.8Hz ~ 7.2Hz.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 20 DEG C that meet the demands for making cast superheat of liquid steel ~ 30 DEG C, in casting process, the RH application of vacuum of the 1st heat can be terminated rear molten steel out-station temperature to control to be 69 DEG C ~ 71 DEG C, the RH application of vacuum of 2nd ~ N heat terminates rear molten steel out-station temperature and controls to be higher than liquidus temperature 50 DEG C ~ 60 DEG C.The RH application of vacuum of the 1st heat terminate rear molten steel out-station temperature control usually by 70 DEG C as target control.
The invention has the beneficial effects as follows: by control cast superheat of liquid steel, poring rate, then stir pattern in conjunction with choose reasonable electricity, electricity stirs parameter, make big cross section heavy rail steel billet crystalline structure uniformity obtain effective guarantee, Inner Quality of Billet is effectively controlled.
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 U71Mn continuous casting billet.Production process working control situation is: it is that middle Baogang liquid first heat out-station temperature is 69 DEG C higher than liquidus temperature 52 DEG C ~ 60 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 23 DEG C ~ 30 DEG C, average 27 DEG C.The normal casting speed control of casting process, at 0.69m/min ~ 0.72m/min, keeps 0.70m/min (constant speed cast) ratio to reach 82%.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 350A, 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; Cold sour dendrite corrosion, detect strand cross section crystalline structure ratio situation, result shows, the Properties of Heavy Rail Steel U71Mn continuous casting billet equiaxial crystal ratio (equiax crystal region area/strand cross sectional area) that this technological invention is produced controls 0.29 ~ 0.35, average out to 0.31, the Properties of Heavy Rail Steel of its level of control and production technology maturation produces section (280mm*380mm) quite.All the other internal soundness indexs all meet technological requirement, and follow the tracks of rail property detection and draw, rail density controls 0.90 ~ 0.95, and density is effectively controlled, and all the other performance indications of rail 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 U75V continuous casting billet.Production process working control situation is: it is that middle Baogang liquid first heat out-station temperature is 69 DEG C higher than liquidus temperature 50 DEG C ~ 58 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 20 DEG C ~ 28 DEG C, average 25 DEG C.The normal casting speed control of casting process, at 0.68m/min ~ 0.72m/min, keeps 0.70m/min (constant speed cast) ratio to reach 80%.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; Cold sour dendrite corrosion, detect strand cross section crystalline structure ratio situation, result shows, the Properties of Heavy Rail Steel U75V continuous casting billet equiaxial crystal ratio (equiax crystal region area/strand cross sectional area) that this technological invention is produced controls 0.28 ~ 0.34, average out to 0.32, the Properties of Heavy Rail Steel of its level of control and production technology maturation produces section (280mm*380mm) quite.All the other internal soundness indexs all meet technological requirement, and follow the tracks of rail property detection and draw, rail density controls 0.91 ~ 0.95, and density is effectively controlled, and all the other performance indications of rail 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 71 DEG C higher than liquidus temperature 51 DEG C ~ 60 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 22 DEG C ~ 30 DEG C, average 26 DEG C.The normal casting speed control of casting process, at 0.69m/min ~ 0.71m/min, keeps 0.70m/min (constant speed cast) ratio to reach 83%.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; Cold sour dendrite corrosion, detect strand cross section crystalline structure ratio situation, result shows, the Properties of Heavy Rail Steel U78CrV continuous casting billet equiaxial crystal ratio (equiax crystal region area/strand cross sectional area) that this technological invention is produced controls 0.30 ~ 0.34, average out to 0.325, the Properties of Heavy Rail Steel of its level of control and production technology maturation produces section (280mm*380mm) quite.All the other internal soundness indexs all meet technological requirement, and follow the tracks of rail property detection and draw, rail density controls 0.92 ~ 0.94, and density is effectively controlled, and all the other performance indications of rail 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 equiaxial crystal ratio obtains effective guarantee especially, strand crystalline structure uniformity and strand density are obtained for effective control, further, corresponding rail density, particularly web of the rail density obtains effective guarantee.
Claims (2)
1. a method for big cross section Properties of Heavy Rail Steel strand crystalline structure uniformity controlling, is characterized in that: in casting process, and cast superheat of liquid steel is 20 DEG C ~ 30 DEG C, and pulling rate is 0.68m/min ~ 0.72m/min; 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 ~ 550A, stirring frequency are 6.8Hz ~ 7.2Hz.
2. the method for a kind of big cross section Properties of Heavy Rail Steel strand crystalline structure uniformity controlling as claimed in claim 1, it is characterized in that: in casting process, it is 69 DEG C ~ 71 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 50 DEG C ~ 60 DEG C.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598407A (en) * | 2016-03-04 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving compactness of center of casting blank |
| 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 |
| 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 |
| CN108251745A (en) * | 2018-01-30 | 2018-07-06 | 舞阳钢铁有限责任公司 | A kind of high pressure resistant boiler drum steel plate of big thickness high-purity and its production method |
| CN110216258A (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 center solidified structure thinning method |
| CN110280732A (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 homogenieity cooperates with lifting control method with compactness |
| 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 | Improvement control method of solidification structure of heavy rail steel slab with super large cross-section |
| CN110303131A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Control method of dispersion segregation of super large section heavy rail steel |
| CN110303130A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel homogeneity improvement control method |
| CN115635055A (en) * | 2022-10-24 | 2023-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Control method for improving symmetry of solidification structure of rectangular billet |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598407A (en) * | 2016-03-04 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving compactness of center of casting blank |
| 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 |
| 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 |
| CN108251745A (en) * | 2018-01-30 | 2018-07-06 | 舞阳钢铁有限责任公司 | A kind of high pressure resistant boiler drum steel plate of big thickness high-purity and its production method |
| CN110216258A (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 center solidified structure thinning method |
| CN110280732A (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 homogenieity cooperates with lifting control method with compactness |
| 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 | Improvement control method of solidification structure of heavy rail steel slab with super large cross-section |
| CN110303131A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Control method of dispersion segregation of super large section heavy rail steel |
| CN110303130A (en) * | 2019-07-22 | 2019-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel homogeneity improvement control method |
| CN115635055A (en) * | 2022-10-24 | 2023-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Control method for improving symmetry of solidification structure of rectangular billet |
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Application publication date: 20160302 |