CN1978092A - Horizontal continuous-casting electromagnetic agitating technology - Google Patents
Horizontal continuous-casting electromagnetic agitating technology Download PDFInfo
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Abstract
The present invention provides a horizontal continuous casting electromagnetic stirring technique. It includes water treatment system for cooling electromagnetic stirrer, electric control system for producing low-frequency power supply and working control system capable of setting and regulating stirring parameter. Said electromagnetic stirring technique can obviously raise central equiaxed crystal rate of casting blank (central equiaxed crystal zone diameter and casting blank diameter percentage).
Description
Technical field
The present invention relates to a kind of technical field of ferrous metallurgy, particularly a kind of electromagnetic agitating technology that is used in the horizontal continuous casting steel machine.
Background technology
Horizontal casting is a kind of than special technique in the continuous casting steel machine, and the movement locus of strand is a horizontal line, and crystallizer does not vibrate during throwing, but the Blank drawing machine band the periodic motion that strand is made " drawing-counter pushing away-stop " various combination.The main feature of horizontal casting is: tundish docks with the crystallizer sealing, and molten steel does not have secondary oxidation; Strand does not reach straightening deformation by bending, is particularly suitable for the cast of strong steel grade of crack sensitivity and high alloy constituent content steel.
The surface quality defect of horizontal casting circular pipe blank mainly contains cold shut, wrinkle, lobe, scabs etc., and the internal soundness defective mainly contains middle crack, shrinkage cavity, center segregation etc.
Blemish can in time be found and adjust the throwing parameter and eliminate, and internal flaw could be found when only doing macroscopic examination, therefore, must take measures to alleviate or eliminate the tissue defects of strand inside.
The generation main cause of middle crack is that molten steel overheat is higher, it is inhomogeneous to form chill in crystallizer, strand adopts air cooling after going out crystallizer, heat transfer path is obstructed and produces and rises again, strand heart portion is flourishing columnar zone, and simultaneously, there is bigger microsegregation in the column crystal border, in this place's enrichment, the liquid film of the sulphide inculsion of enrichment is stable especially at the column crystal boundary easily for low-melting sulphide inculsion.This district becomes solid-liquid two-phase coexistent district, is in low toughness, low-intensity state.Therefore, crackle is the easiest to be produced at the column crystal boundary, and will increase together with the base shell of growth.
Centre burst appears at the equiax crystal district of strand heart portion, near its formation and the steel high-temperature brittleness solidus temperature is closely related, the high-temperature brittleness district is in the following 30-70 of solidus temperature ℃ scope, because elements such as S, P are in interdendritic segregation in the process of setting, form the fluid film that fusing point is lower than solidus temperature, contain the higher crystal boundary of S, P and still be in liquid state under the solidus temperature of large volume material, the crystal boundary that is in liquid phase is non-plastic almost, i.e. zero plasticity temperature range.In this temperature range, when the additional mechanical stress that causes when base shell thermal stress, transformation stress, resistance of billet withdrawal and owing to crystallizer and reasons such as throwing roller center line does not overlap acts on solidification front, the freezing interface formation crackle that will ftracture can further expand afterwards.Because solidification front is rich in the molten steel of solute element and is entered crackle by " suction ", occurs together so centre burst often is accompanied by center segregation, center segregation seriously also can cause the generation of centre burst.
From the generation reason of middle crackle, centre burst and segregation as can be known, reduce or avoid the measure of this type of defective to have: reduce molten steel overheat, reduce P, S content in the steel, improve the strand crystallization condition, and the reduction of the degree of superheat and P, S content is limited, therefore, effective measures are to adopt electromagnetic agitating technology to impel strand to dwindle columnar zone in crystallization process, enlarge the equiax crystal district, to reduce thermal stress, alleviate or eliminate tissue defects and component segregations such as middle crack, centre burst.
In addition; existing arc continuous casting crystallizer is generally vertical layout; be fit to adopt the crystallizer electromagnetic agitation; under the condition of low molten steel overheat, can improve the strand equiaxial crystal ratio by electromagnetic agitation; and impel inclusion floating in the molten steel and adsorbed by crystallizer protecting residue; some steel grade of having relatively high expectations is added the solidification end electromagnetic agitation again, to improve its component segregation.And the crystallizer of horizontal casting, Blank drawing machine and cutting equipment etc. are arranged on the horizontal line, if adopt the crystallizer electromagnetic agitation, because molten steel overheat is higher, less relatively by the equiax crystal district that electromagnetic agitation produces, and strand has a bigger process of rising again after going out crystallizer, and the equiax crystal that has produced can be by a corrode part.Simultaneously, field trash in the molten steel also is difficult to by electromagnetic agitation it be discharged if wash away in the crystallizer.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art and a kind of electromagnetic agitating technology of horizontal casting circular pipe blank in producing that be used in be provided, the technical program is not considered the crystallizer electromagnetic agitation, but the district that rises again behind crystallizer arranges two cold-zone magnetic stirrers, reach the purpose that enlarges strand equiax crystal district, add the solidification end electromagnetic agitation again, with tissue defects such as the component segregation that improves strand, centre burst, layerings, improve strand center equiaxial crystal ratio (center equiax crystal district's diameter and strand diameter percentage).Technical scheme of the present invention is as follows:
One, two cold-zone magnetic stirrers and solidification end magnetic stirrer body are arranged.Steel grade wider range of horizontal casting casting will make electromagnetic agitation get a desired effect, and key is to determine the position and the displacement of magnetic stirrer body.By to calculating, determine that secondary cooling zone magnetic stirrer body is installed in 1-3m behind the crystallizer, displacement 2m without the analysis of electromagnetic agitation strand low power sample tissue and correlation theory; Solidification end magnetic stirrer body is installed in the preceding 2-6m of Blank drawing machine, displacement 4m.
Two, mixing parametric design.Mixing parametric mainly contains three kinds of stir current, supply frequency and alr modes, two cold-zone electromagnetic agitation are the unidirectional rotation of low current (0-150A), higher supply frequency (0-20HZ), help reducing the degree of superheat that molten steel is not solidified in strand heart portion, impel equiax crystal forming core, survive and grow up, help columnar structure is converted to the reduction of ingotism and equiaxed structure and segregation peak value simultaneously; Two cold-zone electromagnetic agitation are two-way rotation, are unfavorable for columnar structure is converted to the reduction of ingotism and equiaxed structure and segregation peak value.
The solidification end electromagnetic agitation is than the two-way rotation of heavy current (0-300A), low supply frequency (0-15HZ), helps when alleviating center segregation, reduces the probability that negative segregation occurs; Solidification end is that unidirectional rotation is unfavorable for alleviating center segregation, and increases the probability of negative segregation.The time interval is: 5-30 second 0-10 second forward 5-30 second-stop-oppositely ..., the time interval is long, helps encouraging the generation of segregation, is unfavorable for alleviating center segregation, and increases the probability of negative segregation; The time interval is too short, and the stable time of stirring is too short, is unfavorable for alleviating center segregation, and increases the probability of negative segregation.
Three, field form determines.The field form of electromagnetic agitation mainly contains three kinds of rotating excitation field, helical magnetic field and travelling-magnetic-fields, adopts rotating excitation field proper for the circular pipe blank than small dimension.
Horizontal continuous-casting electromagnetic agitating technology provided by the invention has following characteristics:
Two cold-zone electromagnetic agitation can reduce the degree of superheat of strand heart portion molten steel, smash the column crystal of growing, using dendrite to fracture becomes the nucleus of equiax crystal, thereby suppresses the development of column crystal, equiax crystal district, expansion center and crystal grain thinning are to alleviate or to eliminate middle crack, shrinkage cavity.
The solidification end electromagnetic agitation can prevent established equiax crystal because of the gravity effect to deposit, simultaneously, evenly the element at strand center " mushy zone " (solid-liquid two-phase region) distributes, and improves the composition segregation, alleviates or eliminates centre burst, center porosity.
Combination electromagnetic agitation in two cold-zones+solidification end both can reduce the liquid steel temperature gradient in strand heart portion solid liquid interface forward position simultaneously with smashing to the column crystal of strand heart portion growth, impel equiax crystal forming core, survive and grow up, enlarge equiax crystal district, center; Evenly the distribution of the crystal grain and the composition of liquid two-phase section is returned at the strand center again.Improved the crystallization condition of strand, improved equiaxial crystal ratio,, reduced the composition segregation simultaneously to alleviate or to eliminate middle crack, centre burst, shrinkage cavity, tissue defects such as loose.
Hengyang steel pipe Co., Ltd is when developing certain high-pressure boiler tube with horizontal continuous casting circular tube blank (∮ 140mm), the wherein first-class electromagnetic mixing apparatus that uses above-mentioned form of a unit, two cold-zone magnetic stirrer bodies are arranged in 1.5m behind the crystallizer, and mixing parametric is: electric current 100-150A, supply frequency 15HZ, unidirectional rotation; Solidification end magnetic stirrer body is arranged in 5m before the throwing roller, and mixing parametric is: stir current 150-250A, supply frequency 12HZ, two-way rotation (time interval forward 25 seconds-stopped 5 seconds-reverse 25 seconds).
The throwing parameter is: 1630 ℃ of liquid steel temperatures, casting speed 1.5-2.5m/min.
The online base sample of getting is done hot acid and soaked macrostructure check and show: the equiaxial crystal ratio through the electromagnetic agitation strand can reach 60%, and the equiaxial crystal ratio that does not use the electromagnetic agitation strand is less than 30%; Centre burst through the electromagnetic agitation strand is 0 grade, and does not use the centre burst of electromagnetic agitation strand to reach 3 grades; That passes through the electromagnetic agitation strand is layered as 0 grade, and does not use the layering of electromagnetic agitation strand to reach 4 grades (as following tables).
In order to be illustrated more clearly in the present invention, enumerate following examples.
Description of drawings
Accompanying drawing is that two cold-zone magnetic stirrers and solidification end magnetic stirrer body are arranged scheme of installation,
Drawing reference numeral: 1-tundish, the 2-mouth of a river, 3-crystallizer, 4-two cold-zone magnetic stirrers, 5-solidification end magnetic stirrer, 6-strand, 7-throwing roller
The specific embodiment
Embodiment one: described horizontal continuous-casting electromagnetic agitating technology comprises water treatment system that magnetic stirrer is cooled off, produce the electric-control system of low-frequency power and can set and adjust the industrial control system of mixing parametric.
1, throwing begins, and the heat of strand 6 is delivered to the agitator body, therefore, start the cooling water system and the control system of electromagnetic agitation in advance.
2, two these 4 bodies of cold-zone magnetic stirrer are arranged in horizontal caster crystallizer 3 back 2m, strand 6 is by behind agitator 4 bodies, when casting speed reaches 1.5m/min, according to steel grade, the specification different set mixing parametric of producing, provide the size of signal controlling electric current and produce alternating magnetic field by industrial computer, molten steel in the strand 6 is stirred.The stir current of two cold-zone magnetic stirrers 4 is that 0-200A, stirring frequency are 0-20HZ, adopt unidirectional rotation to stir, help and to smash to the column crystal of strand 6 heart portions growth, help reducing the liquid steel temperature gradient of solid liquid interface forward position integral body simultaneously, help equiax crystal forming core, survive and grow up, to enlarge equiax crystal district, center.
3, before throwing finishes, molten steel overheat is very little, when reducing casting speed to 1.5m/min, strand 6 heart portions solidify substantially, stop magnetic stirrer, the agitator coil no longer produces heat, but the heat radiation of strand 6 is still bigger, therefore, cooling water treatment system will wait strand 6 all by just stopping behind the agitator body.
4, the field form of electromagnetic agitation mainly contains three kinds of rotating excitation field, helical magnetic field and travelling-magnetic-fields, adopts rotating excitation field proper for the circular pipe blank than small dimension.
Embodiment two: described horizontal continuous-casting electromagnetic agitating technology comprises water treatment system that magnetic stirrer is cooled off, produce the electric-control system of low-frequency power and can set and adjust the industrial control system of mixing parametric.
1, throwing begins, and the heat of strand 6 is delivered to the agitator body, therefore, start the cooling water system and the control system of electromagnetic agitation in advance.
2, solidification end magnetic stirrer 5 bodies are arranged in horizontal caster throwing roller 7 preceding 4m, after strand 6 passes through these 5 bodies of agitator, when casting speed reaches 2.0m/min, according to steel grade, the specification different set mixing parametric of producing, provided the size of signal controlling electric current and produced alternating magnetic field by industrial computer, 6 heart portions stir to strand.The stir current of solidification end magnetic stirrer is that 0-300A, stirring frequency are 0-20HZ, adopt two-way rotation to stir, the time interval is 5-30 second 0-10 second forward 5-30 second-stop-oppositely, can prevent established equiax crystal because of the gravity effect to deposit, simultaneously, evenly the element at strand 6 centers " mushy zone " (solid-liquid two-phase region) distributes.
3, before throwing finishes, molten steel overheat is very little, when reducing casting speed to 1.5m/min, strand 6 heart portions solidify substantially, stop magnetic stirrer, the agitator coil no longer produces heat, but the heat radiation of strand 6 is still bigger, therefore, cooling water treatment system will wait strand 6 all by just stopping behind the agitator body.
4, the field form of electromagnetic agitation mainly contains three kinds of rotating excitation field, helical magnetic field and travelling-magnetic-fields, adopts rotating excitation field proper for the circular pipe blank than small dimension.
Embodiment three: described horizontal continuous-casting electromagnetic agitating technology comprises water treatment system that magnetic stirrer is cooled off, produce the electric-control system of low-frequency power and can set and adjust the industrial control system of mixing parametric.
1, throwing begins, and the heat of strand 6 is delivered to the agitator body, therefore, start the cooling water system and the control system of electromagnetic agitation in advance.
2, two these 4 bodies of cold-zone magnetic stirrer are arranged in horizontal caster crystallizer 3 back 2m, strand 6 is by behind agitator 4 bodies, when casting speed reaches 1.5m/min, according to steel grade, the specification different set mixing parametric of producing, provide the size of signal controlling electric current and produce alternating magnetic field by industrial computer, molten steel in the strand 6 is stirred.The stir current of two cold-zone magnetic stirrers 4 is that 0-200A, stirring frequency are 0-20HZ, adopt unidirectional rotation to stir, help and to smash to the column crystal of strand 6 heart portions growth, help reducing the liquid steel temperature gradient of solid liquid interface forward position integral body simultaneously, help equiax crystal forming core, survive and grow up, to enlarge equiax crystal district, center.
3, solidification end magnetic stirrer 5 bodies are arranged in horizontal caster throwing roller 7 preceding 4m, after strand 6 passes through these 5 bodies of agitator, when casting speed reaches 2.0m/min, according to steel grade, the specification different set mixing parametric of producing, provided the size of signal controlling electric current and produced alternating magnetic field by industrial computer, 6 heart portions stir to strand.The stir current of solidification end magnetic stirrer is that 0-300A, stirring frequency are 0-20HZ, adopt two-way rotation to stir, the time interval is 5-30 second 0-10 second forward 5-30 second-stop-oppositely, can prevent established equiax crystal because of the gravity effect to deposit, simultaneously, evenly the element at strand 6 centers " mushy zone " (solid-liquid two-phase region) distributes.
4, before throwing finishes, molten steel overheat is very little, when reducing casting speed to 1.5m/min, strand 6 heart portions solidify substantially, stop magnetic stirrer, the agitator coil no longer produces heat, but the heat radiation of strand 6 is still bigger, therefore, cooling water treatment system will wait strand 6 all by just stopping behind the agitator body.
5, the field form of electromagnetic agitation mainly contains three kinds of rotating excitation field, helical magnetic field and travelling-magnetic-fields, adopts rotating excitation field proper for the circular pipe blank than small dimension.
Claims (3)
1, a kind of horizontal continuous-casting electromagnetic agitating technology is characterized in that it comprises water treatment system that magnetic stirrer is cooled off, produces the electric-control system of low-frequency power and can set and adjust the industrial control system of mixing parametric, and its concrete grammar and step are:
(a), throwing begins, the heat of strand (6) is delivered to the agitator body, therefore, start the cooling water system and the control system of electromagnetic agitation in advance;
(b), two cold-zone magnetic stirrer (4) bodies are arranged in horizontal caster crystallizer (3) back 1-3m, displacement 2m, strand (6) is by behind the agitator body, when casting speed reaches 1.5m/min, according to the steel grade of producing, specification different set mixing parametric, provide the size of signal controlling electric current and produce alternating magnetic field by industrial computer, molten steel in the strand (6) is stirred, the stir current of two cold-zone magnetic stirrers (4) is 0-200A, stirring frequency is 0-20HZ, adopt unidirectional rotation to stir, help and to smash to the column crystal of strand (6) heart portion growth, help reducing the liquid steel temperature gradient of solid liquid interface forward position integral body simultaneously, the forming core that helps equiax crystal, existence and growing up is to enlarge equiax crystal district, center;
(c), before throwing finishes, molten steel overheat is very little, when reducing casting speed to 1.5m/min, strand (6) heart portion solidifies substantially, stop magnetic stirrer, the agitator coil no longer produces heat, but the heat radiation of strand (6) is still bigger, therefore, cooling water treatment system will wait strand (6) all by just stopping behind the agitator body;
(d), the field form of electromagnetic agitation mainly contains three kinds of rotating excitation field, helical magnetic field and travelling-magnetic-fields, adopts rotating excitation field for the circular pipe blank than small dimension.
2, according to claim 1 described horizontal continuous-casting electromagnetic agitating technology, it is characterized in that it comprises water treatment system that magnetic stirrer is cooled off, produces the electric-control system of low-frequency power and can set and adjust the industrial control system of mixing parametric, its concrete grammar and step are:
(a), throwing begins, the heat of strand (6) is delivered to the agitator body, therefore, start the cooling water system and the control system of electromagnetic agitation in advance;
(b), two cold-zone magnetic stirrer (4) bodies are arranged in horizontal caster crystallizer (3) back 1-3m, displacement 2m, strand (6) is by behind the agitator body, when casting speed reaches 1.5m/min, according to the steel grade of producing, specification different set mixing parametric, provide the size of signal controlling electric current and produce alternating magnetic field by industrial computer, molten steel in the strand (6) is stirred, the stir current of two cold-zone magnetic stirrers (4) is 0-200A, stirring frequency is 0-20HZ, adopt unidirectional rotation to stir, help and to smash to the column crystal of strand (6) heart portion growth, help reducing the liquid steel temperature gradient of solid liquid interface forward position integral body simultaneously, the forming core that helps equiax crystal, existence and growing up is to enlarge equiax crystal district, center;
(c), solidification end magnetic stirrer (5) body is arranged in the preceding 2-6m of horizontal caster throwing roller (7), displacement 4m, strand (6) is by behind the agitator body, when casting speed reaches 2.0m/min, according to the steel grade of producing, specification different set mixing parametric, provide the size of signal controlling electric current and produce alternating magnetic field by industrial computer, heart portion stirs to strand (6), the stir current of solidification end magnetic stirrer (5) is 0-300A, stirring frequency is 0-20HZ, adopt two-way rotation to stir, the time interval is 5-30 second 0-10 second forward 5-30 second-stop-oppositely, can prevent established equiax crystal because of the gravity effect to deposit, simultaneously, evenly the element at strand (6) center " mushy zone " (solid-liquid two-phase region) distributes;
(d), before throwing finishes, molten steel overheat is very little, when reducing casting speed to 1.5m/min, strand (6) heart portion solidifies substantially, stop magnetic stirrer, the agitator coil no longer produces heat, but the heat radiation of strand (6) is still bigger, therefore, cooling water treatment system will wait strand (6) all by just stopping behind the agitator body;
(e), the field form of electromagnetic agitation mainly contains three kinds of rotating excitation field, helical magnetic field and travelling-magnetic-fields, adopts rotating excitation field for the circular pipe blank than small dimension.
3, horizontal continuous-casting electromagnetic agitating technology according to claim 2, it is characterized in that it comprises water treatment system that magnetic stirrer is cooled off, produces the electric-control system of low-frequency power and can set and adjust the industrial control system of mixing parametric, its concrete grammar and step are:
(a), throwing begins, the heat of strand (6) is delivered to the agitator body, therefore, start the cooling water system and the control system of electromagnetic agitation in advance;
(b), solidification end magnetic stirrer (5) body is arranged in the preceding 2-6m of horizontal caster throwing roller (7), displacement 4m, strand (6) is by behind the agitator body, when casting speed reaches 2.0m/min, according to the steel grade of producing, specification different set mixing parametric, provide the size of signal controlling electric current and produce alternating magnetic field by industrial computer, heart portion stirs to strand (6), the stir current of solidification end magnetic stirrer (5) is 0-300A, stirring frequency is 0-20HZ, adopt two-way rotation to stir, the time interval is 5-30 second 0-10 second forward 5-30 second-stop-oppositely, can prevent established equiax crystal because of the gravity effect to deposit, simultaneously, evenly the element at strand (6) center " mushy zone " (solid-liquid two-phase region) distributes;
(c), before throwing finishes, molten steel overheat is very little, when reducing casting speed to 1.5m/min, strand (6) heart portion solidifies substantially, stop magnetic stirrer, the agitator coil no longer produces heat, but the heat radiation of strand (6) is still bigger, therefore, cooling water treatment system will wait strand (6) all by just stopping behind the agitator body;
(d), the field form of electromagnetic agitation mainly contains three kinds of rotating excitation field, helical magnetic field and travelling-magnetic-fields, adopts rotating excitation field for the circular pipe blank than small dimension.
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| CN112974750A (en) * | 2021-02-08 | 2021-06-18 | 东北大学 | Device and method for regulating and controlling flow and solidification of special steel in secondary cooling zone by dynamic combined magnetic field |
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| CN114951579B (en) * | 2021-02-24 | 2024-05-03 | 山西太钢不锈钢股份有限公司 | Continuous casting method of high-carbon martensitic stainless steel |
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