CN110280731A - Large section Properties of Heavy Rail Steel center solidified structure thinning method - Google Patents
Large section Properties of Heavy Rail Steel center solidified structure thinning method Download PDFInfo
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- CN110280731A CN110280731A CN201910660537.3A CN201910660537A CN110280731A CN 110280731 A CN110280731 A CN 110280731A CN 201910660537 A CN201910660537 A CN 201910660537A CN 110280731 A CN110280731 A CN 110280731A
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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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- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- Mechanical Engineering (AREA)
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Abstract
Disclosed by the invention is a kind of large section Properties of Heavy Rail Steel center solidified structure thinning method of field of steel metallurgy, focusing on the continuous casting stage is controlled using following steps: Stirring During Continuous Casting uses two cold electromagnetic agitations, wherein the two cold specific installation sites of electromagnetic agitation are apart from the section 7.0~8.0m of crystallizer molten steel surface, stir current frequency is 7.0~8.0Hz, and magnetic field strength is 350 × 10‑4~400 × 10‑4T；Middle packet casting superheat of liquid steel is by 40~45 DEG C of execution；Continuous casting two cold section needs secondary cooling zone domain to cover to apart from crystallizer molten steel surface 15.0m.It is controlled according to above-mentioned parameter, effectively control the forming core crystallization of large section Properties of Heavy Rail Steel bloom central area molten steel, promote Local cooling solidification rate, so that slab center solidified structure, which forms to obtain, improves control, column crystal is more flourishing, and crystalline style is thin and fine and close, equiax crystal grain form changes, crystalline style is thin and fine and close and clear, and Models For Secondary Dendrite Arm spacing reduces, and slab central area solidified structure degree of refinement and homogeneity of ingredients improvement are significant.
Description
Technical field
The present invention relates to field of steel metallurgy more particularly to a kind of large section Properties of Heavy Rail Steel center solidified structure refinement sides
Method.
Background technique
Rail is the main building block of railroad track, in railway transport course, provides locomotive and effectively supports and draw
It leads, is subjected to the huge lateral pressure from wheel.Based on China's infrastructure growth requirement, railway transportation is just with swift and violent speed
Degree development, and constantly tend to high speed, heavy loading.This undoubtedly proposes more harsh requirement to rail quality.Rail quality
Promotion be embodied in steel quality control level itself to a certain extent, such as high homogenieity, high-cleanness, Gao Chengfen precision.Its
The homogenieity (degree of segregation is smaller, and rail homogenieity is higher) of middle rail influences the uniformity of steel tissue, serious segregation meeting
The welding performance of rail base material and rail is influenced, and then influences rail and is on active service and uses.In metallurgy industry, a large amount of expert is learned
Person to slab segregation be studied in detail, research is pointed out: during solidification of molten steel, due to solute element in solid liquid phase again
Distribution forms the uneven of Chemical Composition in Cast Billet.Meanwhile research is pointed out, during solidification of molten steel, is successively crystallized from liquid
Solid-phase component out is different, as a result makes an intra-die uneven chemical components, this phenomenon is known as microsegregation.This
Outside, research finds that significant corresponding relationship is presented in the differentiation distribution of slab segregation and solidified structure composition distribution；The study found that isometric
It is since intensive equiax crystal crystal grain will concentrate on the normal segregation of the larger area at center originally why crystalline substance, which improves center segregation,
Region is divided, and divides the later more developed slab of equiax crystal under the conditions of identical detection scale due in test sample
Crystal grain (negative segregation) accounting increases, therefore normal segregation value reduces.But go deep into research, discovery is small to certain when detection scale
Degree, the intercrystalline normal segregation of equiax crystal is obvious, and equiax crystal area ratio is bigger, and disperse segregation distribution is wider, more serious.By
This, it is believed that improving equiaxial crystal ratio, there is no fundamentally uniform steel, but the normal segregation molten steel that script is concentrated is divided,
The distribution of dispersion tinyization, as a result causes serious disperse to be segregated.
Summary of the invention
The deficiencies of to overcome existing large section Properties of Heavy Rail Steel center solidified structure equiax crystal coarse grains, the present invention to be solved
Certainly the technical issues of, is: provide it is a kind of large section Properties of Heavy Rail Steel center solidified structure can be made thin and fine and close, slab homogenieity controls
Improved control method.
The technical solution adopted by the present invention to solve the technical problems is:
Large section Properties of Heavy Rail Steel center solidified structure thinning method, including following technique is successively carried out, converter smelting, LF furnace
Refining, RH vacuum, continuous casting, heating and rolling are controlled in the continuous casting stage using following steps:
A, Stirring During Continuous Casting: using two cold electromagnetic agitations, wherein the two cold specific installation sites of electromagnetic agitation are distance knot
The brilliant device molten steel face section 7.0~8.0m, the stir current frequency of two cold electromagnetic agitations is 7.0~8.0Hz, strong by adjusting electric current
Degree is to control stirring magnetic field strength as 350 × 10-4~400 × 10-4T；
B, middle packet casting superheat of liquid steel: Baogang's liquid is cast using high degree of superheat technique in continuous casting process, degree of superheat control
It is specific to be executed by 40~45 DEG C；
C, continuous casting two cold: for the intensity of secondary cooling used for Qiang Leng, specific cooling water inflow presses 0.33~0.34L/kg of specific waterSteelIt holds
Row, secondary cooling zone domain is covered to apart from crystallizer molten steel surface 17.0m.
Further, the section of the bloom Properties of Heavy Rail Steel be 320mm × 410mm, be suitable for including at least U71Mn,
The Properties of Heavy Rail Steel of U78CrV and U75V kind produces.
Further, pulling speed of continuous casting is cooperated by 0.69~0.72m/min in continuous casting process, casting speed control fluctuates pole
Difference≤0.02m/min.
The beneficial effects of the present invention are: for the control requirement that the refinement of large section Properties of Heavy Rail Steel center solidified structure is promoted,
Process system is equipped by rationally designing large section Properties of Heavy Rail Steel continuous casting, cancels traditional M-EMS, it is cold using two
Electromagnetic agitation, and the technical datas systems such as suitable mixing position and region are studied and defined, and by accurately controlling continuous casting
The degree of superheat in stage, two parameters such as cold promote Local cooling solidification speed so that the forming core of slab central area molten steel crystallizes
Rate, centre solidified structure, which forms to obtain, improves control, and column crystal is more flourishing, and crystalline style is thin and fine and close, equiax crystal grain shaped
State changes, and crystalline style is thin and fine and close and clear, and Models For Secondary Dendrite Arm spacing reduces, and rail solidified structure transition is gentle, center solidification group
Knitting degree of refinement and homogeneity of ingredients improves significantly.
Specific embodiment
Below with reference to embodiment, the present invention is further described.
Bloom Properties of Heavy Rail Steel described herein refers to that section is the square billet of 320mm × 410mm, is applicable to generate
The heavy rail of U71Mn, U78CrV or U75V model.
Though Properties of Heavy Rail Steel conventional production process tends to be mature at present, with world-class enterprise there are obvious quality gap, with
Rail Service Environment condition is increasingly harsh and various complication, rail property require it is more harsh, with rail homogenieity and solidifying
Gu the relevant series of problems of tissue Precise control gradually exposes, the present invention is thin for large section Properties of Heavy Rail Steel center solidified structure
The needs for changing control, provide scientific and reasonable and effective technical system, are related to critical equipment outfit and process matched therewith system
System studies and defines the technical parameter system to match with quality control requirements on this basis.Large section weight of the invention
Rail steel center solidified structure thinning method, including successively carry out following technique, converter smelting, the refining of LF furnace, RH vacuum, continuous casting,
Heating and rolling, main improvement are controlled in the continuous casting stage using following steps in the continuous casting stage:
A, Stirring During Continuous Casting: using two cold electromagnetic agitations, wherein the two cold specific installation sites of electromagnetic agitation are distance knot
The brilliant device molten steel face section 7.0~8.0m, the stir current frequency of two cold electromagnetic agitations is 7.0~8.0Hz, strong by adjusting electric current
Degree is to control stirring magnetic field strength as 350 × 10-4~400 × 10-4T；
B, middle packet casting superheat of liquid steel: Baogang's liquid is cast using high degree of superheat technique in continuous casting process, degree of superheat control
It is specific to be executed by 40~45 DEG C；
C, continuous casting two cold: for the intensity of secondary cooling used for Qiang Leng, specific cooling water inflow presses 0.33~0.34L/kg of specific waterSteelIt holds
Row, secondary cooling zone domain is covered to apart from crystallizer molten steel surface 17.0m.
The entire technical process of Rail Production has been comparative maturity, and the main distinction is the key in technical process
Equipment is equipped with, on critical process system and process parameter control.The application is mainly for M-EMS in traditional handicraft
Brought defect, by changing Stirring During Continuous Casting mode, using the side of two cold electromagnetic agitation substitution M-EMSs
Formula, and the specific location in the cold electromagnetic agitation of structure adjusting two and secondary cooling zone domain, magnetic field strength, power frequency, the degree of superheat, two cold ratios
The parameters such as water obtain according to a large number of experiments comparison, are controlled according to the parameter, can make the solidification group at Properties of Heavy Rail Steel slab center
Knitting becomes thin and fine and close, and slab homogenieity significantly improves.
Other than above-mentioned core technology, to reach better continuous casting effect, it is also necessary to which the cooperation of pulling speed of continuous casting controls, specifically
For pulling speed of continuous casting is cooperated by 0.69~0.72m/min in continuous casting process, and casting speed control fluctuates very poor value≤0.02m/min.
It is further illustrated below by three specific embodiments.
Embodiment 1
Certain domestic steel mill produces U71Mn series Properties of Heavy Rail Steel using the technology of the present invention, and rolling rail type is 60kg/m.The present invention is closed
Key technology point actual process executive condition are as follows: (1) Stirring During Continuous Casting: the two cold specific installation sites of electromagnetic agitation are distance crystallization
The device molten steel face section 7.0~8.0m；The stir current frequency of two cold electromagnetic agitations is 7.0Hz, by adjusting current strength to control
System stirring magnetic field strength is 376 × 10-4The cold electromagnetic agitation of the two of T.(2) packet casting superheat of liquid steel in: Baogang in continuous casting process
Liquid is cast using high degree of superheat technique, and degree of superheat control is specifically by 40~45 DEG C of execution.(3) continuous casting two cold: what the present invention used
Intensity of secondary cooling is Qiang Leng, and specific cooling water inflow presses specific water 0.34L/kgSteelIt executes, secondary cooling zone domain is covered to apart from crystallizer molten steel
Face 17.0m.
In addition, with the coordinated company of above-mentioned three core technologies (technical system and technological parameter group) of the present invention
Casting pulling rate is cooperated by 0.70~0.72m/min: very poor value≤0.02m/min is fluctuated in the control of continuous casting process Actual Casting Speed.
Solidified structure inspection is carried out to test slab, from slab leptoprosopy to slab center position, slab column crystal is ended in
Apart from 98~105mm of leptoprosopy, isometric crystalline region grain form changes, and (equiax crystal crystal grain is in short and thick shape under normal condition
State, crystalline style are in cluster-shaped, and crystalline style is unintelligible), isometric crystalline region crystal grain is in tiny shape, and the crystalline style of crystal grain is clear, between Models For Secondary Dendrite Arm
Away from small, crystalline style tissue is thin and fine and close；Solidified structure corrosion check is carried out to rail, solidified structure crystalline style is clear, solidified structure mistake
Cross that gentle (under normal condition, bloom Properties of Heavy Rail Steel casting blank solidification tissue subregion is obvious, mixed in chill --- column crystal ---
It is brilliant --- equiax crystal distribution).Slab Center Equiaxial Crystal area's crystal grain is changed into elongated condition by short and thick form, and crystal grain crystalline style density is more
Height, slab roll out steel rail web of the rail disperse segregation zones are substantially reduced.
Embodiment 2
Certain domestic steel mill produces U78CrV series Properties of Heavy Rail Steel using the technology of the present invention, and rolling rail type is 75kg/m.The present invention
Key technology point actual process executive condition are as follows: (1) Stirring During Continuous Casting: the two cold specific installation sites of electromagnetic agitation are distance knot
The brilliant device molten steel face section 7.0~8.0m；The stir current frequency of two cold electromagnetic agitations be 8.0Hz, by adjust current strength with
Control stirring magnetic field strength is 350 × 10-4The cold electromagnetic agitation of the two of T.(2) it packet casting superheat of liquid steel in: is wrapped in continuous casting process
Molten steel is cast using high degree of superheat technique, and degree of superheat control is specifically by 40~44 DEG C of execution.(3) continuous casting two cold: the present invention uses
Intensity of secondary cooling be Qiang Leng, specific cooling water inflow press specific water 0.332L/kgSteelIt executes, secondary cooling zone domain is covered to apart from crystallizer
Molten steel face 17.0m.
In addition, with the coordinated company of above-mentioned three core technologies (technical system and technological parameter group) of the present invention
Casting pulling rate is cooperated by 0.69~0.71m/min: very poor value≤0.02m/min is fluctuated in the control of continuous casting process Actual Casting Speed.
Solidified structure inspection is carried out to test slab, from slab leptoprosopy to slab center position, slab column crystal is ended in
Apart from 95~99mm of leptoprosopy, isometric crystalline region grain form change (under normal condition equiax crystal crystal grain in the form of short and thick,
Crystalline style is in cluster-shaped, and crystalline style is unintelligible), isometric crystalline region crystal grain is in tiny shape, and the crystalline style of crystal grain is clear, Models For Secondary Dendrite Arm spacing
Small, crystalline style tissue is thin and fine and close；Solidified structure corrosion check is carried out to rail, solidified structure crystalline style is clear, solidified structure transition
Gently (under normal condition, bloom Properties of Heavy Rail Steel casting blank solidification tissue subregion is obvious, mixed in chill --- column crystal ---
It is brilliant --- equiax crystal distribution).Slab Center Equiaxial Crystal area's crystal grain is changed into elongated condition by short and thick form, and crystal grain crystalline style density is more
Height, slab roll out steel rail web of the rail disperse segregation zones are substantially reduced.
Embodiment 3
Certain domestic steel mill produces U75V series Properties of Heavy Rail Steel using the technology of the present invention, and rolling rail type is 60kg/m.The present invention is closed
Key technology point actual process executive condition are as follows: (1) Stirring During Continuous Casting: the two cold specific installation sites of electromagnetic agitation are distance crystallization
The device molten steel face section 7.0~8.0m；The stir current frequency of two cold electromagnetic agitations is 7.4Hz, by adjusting current strength to control
System stirring magnetic field strength is 400 × 10-4The cold electromagnetic agitation of the two of T.(2) packet casting superheat of liquid steel in: Baogang in continuous casting process
Liquid is cast using high degree of superheat technique, and degree of superheat control is specifically by 41~45 DEG C of execution.(3) continuous casting two cold: what the present invention used
Intensity of secondary cooling is Qiang Leng, and specific cooling water inflow presses specific water 0.33L/kgSteelIt executes, secondary cooling zone domain is covered to apart from crystallizer molten steel
Face 17.0m.
In addition, with the coordinated company of above-mentioned three core technologies (technical system and technological parameter group) of the present invention
Casting pulling rate is cooperated by 0.69~0.70m/min: very poor value≤0.02m/min is fluctuated in the control of continuous casting process Actual Casting Speed.
Solidified structure inspection is carried out to test slab, from slab leptoprosopy to slab center position, slab column crystal is ended in
Apart from 96~102mm of leptoprosopy, isometric crystalline region grain form changes, and (equiax crystal crystal grain is in short and thick shape under normal condition
State, crystalline style are in cluster-shaped, and crystalline style is unintelligible), isometric crystalline region crystal grain is in tiny shape, and the crystalline style of crystal grain is clear, between Models For Secondary Dendrite Arm
Away from small, crystalline style tissue is thin and fine and close；Solidified structure corrosion check is carried out to rail, solidified structure crystalline style is clear, solidified structure mistake
Cross that gentle (under normal condition, bloom Properties of Heavy Rail Steel casting blank solidification tissue subregion is obvious, mixed in chill --- column crystal ---
It is brilliant --- equiax crystal distribution).Slab Center Equiaxial Crystal area's crystal grain is changed into elongated condition by short and thick form, and crystal grain crystalline style density is more
Height, slab roll out steel rail web of the rail disperse segregation zones are substantially reduced.
Above-described embodiment illustrates the Properties of Heavy Rail Steel using the technology of the present invention production, and casting blank solidification tissue forms to obtain improvement control
System, column crystal is more flourishing, and crystalline style is thin and fine and close, and equiax crystal grain form changes, and crystalline style is thin and fine and close and clear, secondary dendrite
Arm spacing reduces, and crystal grain crystalline style density is higher, and disperse segregation zones are substantially reduced.
Claims (3)
1. large section Properties of Heavy Rail Steel center solidified structure thinning method, including following technique is successively carried out, converter smelting, LF furnace essence
Refining, RH vacuum, continuous casting, heating and rolling, characterized in that controlled in the continuous casting stage using following steps:
A, Stirring During Continuous Casting: using two cold electromagnetic agitations, wherein the two cold specific installation sites of electromagnetic agitation are apart from crystallizer
The molten steel face section 7.0~8.0m, the stir current frequencies of two cold electromagnetic agitations are 7.0~8.0Hz, by adjust current strength with
Control stirring magnetic field strength is 350 × 10-4~400 × 10-4T；
B, middle packet casting superheat of liquid steel: Baogang's liquid is cast using high degree of superheat technique in continuous casting process, and degree of superheat control is specific
It is executed by 40~45 DEG C；
C, continuous casting two cold: for the intensity of secondary cooling used for Qiang Leng, specific cooling water inflow presses 0.33~0.34L/kg of specific waterSteelIt executes,
Secondary cooling zone domain is covered to apart from crystallizer molten steel surface 17.0m.
2. large section Properties of Heavy Rail Steel as described in claim 1 center solidified structure thinning method, it is characterized in that: the bloom
The section of Properties of Heavy Rail Steel is 320mm × 410mm, and the Properties of Heavy Rail Steel suitable for including at least U71Mn, U78CrV and U75V kind produces.
3. large section Properties of Heavy Rail Steel as described in claim 1 center solidified structure thinning method, it is characterized in that: in continuous casting process
Pulling speed of continuous casting is cooperated by 0.69~0.72m/min, and casting speed control fluctuates very poor value≤0.02m/min.
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Citations (5)
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|---|---|---|---|---|
| JPS57115954A (en) * | 1981-01-09 | 1982-07-19 | Toshiba Corp | Method for controlling electromagnetic stirring of continuous casting installation |
| CN104959562A (en) * | 2015-07-23 | 2015-10-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Large billet heavy rail steel continuous casting method |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
| CN105215309A (en) * | 2015-11-11 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls |
| CN105364042A (en) * | 2015-11-11 | 2016-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling crystalline structure uniformity of large-section heavy rail steel cast blank |
-
2019
- 2019-07-22 CN CN201910660537.3A patent/CN110280731A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115954A (en) * | 1981-01-09 | 1982-07-19 | Toshiba Corp | Method for controlling electromagnetic stirring of continuous casting installation |
| CN104959562A (en) * | 2015-07-23 | 2015-10-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Large billet heavy rail steel continuous casting method |
| CN105215309A (en) * | 2015-11-11 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel center segregation of casting blank controls |
| CN105364042A (en) * | 2015-11-11 | 2016-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling crystalline structure uniformity of large-section heavy rail steel cast blank |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
Non-Patent Citations (2)
| Title |
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| 周琳: "《中国长材轧制技术与装备》", 30 June 2014, 冶金工业出版社 * |
| 孙立根: "《连铸设计原理》", 31 August 2017, 冶金工业出版社 * |
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Application publication date: 20190927 |