CN110303124A - Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method - Google Patents
Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method Download PDFInfo
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- CN110303124A CN110303124A CN201910660945.9A CN201910660945A CN110303124A CN 110303124 A CN110303124 A CN 110303124A CN 201910660945 A CN201910660945 A CN 201910660945A CN 110303124 A CN110303124 A CN 110303124A
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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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Abstract
Disclosed by the invention is that a kind of large section Properties of Heavy Rail Steel casting blank solidification tissue of field of steel metallurgy improves control method, 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, and stir current frequency is 6.0~7.5Hz；Middle packet casting superheat of liquid steel is by 40~45 DEG C of execution；The continuous casting two cold stage needs secondary cooling zone domain to cover to apart from crystallizer molten steel surface 17.0m.The application eliminates traditional M-EMS, using two cold electromagnetic agitations, suitable mixing position and region, and the parameters by accurately controlling the continuous casting stage are determined, so that slab tunneling boring solidified structure, which forms to obtain, improves control, column crystal is more flourishing, and crystalline style is thin and fine and close, and equiax crystal grain form changes, crystalline style is thin and fine and close and clear, Models For Secondary Dendrite Arm spacing reduces, and steel billet solidified structure transition is gentle, and solidified structure and homogeneity of ingredients improve significantly.
Description
Technical field
The present invention relates to field of steel metallurgy more particularly to a kind of bloom heavy rail rail head region homogenieity promotion 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；Expert researchs and proposes,
The size of Models For Secondary Dendrite Arm spacing reflects the severity of microsegregation.Therefore, the improvement control of casting blank solidification tissue, counterweight
The promotion of rail steel homogenieity is of great significance.
Summary of the invention
The deficiencies of to overcome existing large section Properties of Heavy Rail Steel casting blank solidification liver mass poor, skill to be solved by this invention
Art problem is: providing a kind of Properties of Heavy Rail Steel casting blank solidification tissue that can make large section becomes thin and fine and close, the control of slab homogenieity
Improved control method.
The technical solution adopted by the present invention to solve the technical problems is:
Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method, including successively carries out following technique, converter smelting,
The refining of LF furnace, 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 6.0~7.5Hz, strong by adjusting electric current
Degree is to control stirring magnetic field strength as 250 × 10-4~300 × 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 0.31~0.32L/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 heavy rail 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: improving the control requirement promoted for large section Properties of Heavy Rail Steel solidified structure, pass through
It rationally designs large section Properties of Heavy Rail Steel continuous casting and equips process system, cancel traditional M-EMS, using two cold electromagnetism
Stirring, and the technical datas systems such as suitable mixing position and region are studied and defined, and by accurately controlling the continuous casting stage
Parameters so that slab tunneling boring solidified structure, which forms to obtain, improves control, column crystal is more flourishing, and crystalline style is thin and causes
Close, equiax crystal grain form changes, and crystalline style is thin and fine and close and clear, and Models For Secondary Dendrite Arm spacing reduces, rail solidified structure transition
Gently, solidified structure and homogeneity of ingredients improve significant.
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 produce
The heavy rail of the kinds such as U71Mn, U78CrV or U75V.
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 improves control for large section Properties of Heavy Rail Steel solidified structure
The needs of system provide scientific and reasonable and effective technical system, are related to critical equipment outfit and process matched therewith system,
The technical parameter system to match with quality control requirements is studied and defined on this basis.Large section Properties of Heavy Rail Steel casting of the invention
Base solidified structure improves control method, including successively carries out following technique, and converter smelting, RH vacuum, continuous casting, adds the refining of LF furnace
Heat 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 6.0~7.5Hz, strong by adjusting electric current
Degree is to control stirring magnetic field strength as 250 × 10-4~300 × 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 0.31~0.32L/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 segregation defects are cancelled the mode of M-EMS by using two cold electromagnetic agitations, and are determined emphatically
The specific location of two cold electromagnetic agitations and secondary cooling zone domain, in addition subtle adjustment magnetic field strength, power frequency, the degree of superheat and two are cold
The parameters such as specific water, compare according to a large number of experiments, are controlled according to the parameter, and large section Properties of Heavy Rail Steel slab tunneling boring can be made
Solidified structure 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 320mm × 410mm large section U75V series Properties of Heavy Rail Steel using the technology of the present invention, rolls rail
Type is 60kg/m.Key technology point actual process executive condition of the present invention are as follows: (1) Stirring During Continuous Casting: two cold electromagnetic agitation tools
Body installation site is apart from the section 7.0~8.0m of crystallizer molten steel surface；The stir current frequency of two cold electromagnetic agitations is 7.0Hz,
By adjusting current strength to control stirring magnetic field strength as 250 × 10-4The cold electromagnetic agitation of the two of T.(2) packet casting molten steel mistake in
Temperature: Baogang's liquid is cast using high degree of superheat technique in continuous casting process, and degree of superheat control is specifically by 41~44 DEG C of execution.(3) even
It is cold to cast two: for the intensity of secondary cooling that the present invention uses for Qiang Leng, specific cooling water inflow presses specific water 0.32L/kgSteelIt executes, secondary cooling zone domain
Covering is to apart from crystallizer molten steel surface 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 88~92mm 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).Segregation differentiation transition is gentle, and tissue and homogeneity of ingredients are improved.
Embodiment 2
Certain domestic steel mill produces 320mm × 410mm large section U78CrV series Properties of Heavy Rail Steel, rolling using the technology of the present invention
Rail type is 75kg/m.Key technology point actual process executive condition of the present invention are as follows: (1) Stirring During Continuous Casting: two cold electromagnetic agitations
Specific installation site is apart from the section 7.0~8.0m of crystallizer molten steel surface；The stir current frequency of two cold electromagnetic agitations is
6.0Hz, by adjusting current strength to control stirring magnetic field strength as 270 × 10-4The cold electromagnetic agitation of the two of T.(2) packet casting in
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 specifically by 41~45 DEG C of execution.
(3) continuous casting two cold: for the intensity of secondary cooling that the present invention uses for Qiang Leng, specific cooling water inflow presses specific water 0.317L/kgSteelIt executes, two
Cold region overlay is to apart from crystallizer molten steel surface 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 84~92mm 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).Segregation differentiation transition is gentle, and tissue and homogeneity of ingredients are improved.
Embodiment 3
Certain domestic steel mill produces 320mm × 410mm large section U71Mn series Properties of Heavy Rail Steel, rolling using the technology of the present invention
Rail type is 60kg/m.Key technology point actual process executive condition of the present invention are as follows: (1) Stirring During Continuous Casting: two cold electromagnetic agitations
Specific installation site is apart from the section 7.0~8.0m of crystallizer molten steel surface；The stir current frequency of two cold electromagnetic agitations is
7.5Hz, by adjusting current strength to control stirring magnetic field strength as 300 × 10-4The cold electromagnetic agitation of the two of T.(2) packet casting in
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 specifically by 40~45 DEG C of execution.
(3) continuous casting two cold: for the intensity of secondary cooling that the present invention uses for Qiang Leng, specific cooling water inflow presses specific water 0.31L/kgSteelIt executes, two is cold
Region overlay is to apart from crystallizer molten steel surface 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 0.71~0.72m/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 81~90mm 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).Segregation differentiation transition is gentle, and tissue and homogeneity of ingredients are improved.
Above-described embodiment illustrates 320mm × 410mm large section Properties of Heavy Rail Steel using the technology of the present invention production, casting blank solidification
Tissue composition obtains improving control, and column crystal is more flourishing, and crystalline style is thin and fine and close, and equiax crystal grain form changes, crystalline style carefully and
Fine and close and clear, Models For Secondary Dendrite Arm spacing reduces；Rail solidified structure transition is gentle, and solidified structure and homogeneity of ingredients improvement are aobvious
It writes.
Claims (3)
1. large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method, including successively carries out following technique, converter smelting, LF
Furnace 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 6.0~7.5Hz, by adjust current strength with
Control stirring magnetic field strength is 250 × 10-4~300 × 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 0.31~0.32L/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 casting blank solidification tissue as described in claim 1 improves control method, it is characterized in that: described big
The section of square billet 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 is raw
It produces.
3. large section Properties of Heavy Rail Steel casting blank solidification tissue as described in claim 1 improves control method, it is characterized in that: continuous casting mistake
Pulling speed of continuous casting is cooperated by 0.69~0.72m/min in journey, and casting speed control fluctuates very poor value≤0.02m/min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111283156A (en) * | 2020-03-23 | 2020-06-16 | 江苏利淮钢铁有限公司 | Method for reducing segregation in casting process of continuous casting square billet for gear |
| CN113843402A (en) * | 2021-09-18 | 2021-12-28 | 山东钢铁股份有限公司 | Control method for internal solidification structure of gear steel ultra-large section round billet |
| CN113857449A (en) * | 2021-09-14 | 2021-12-31 | 湖南华菱涟源钢铁有限公司 | Preparation method of oriented silicon steel casting blank and casting blank system |
| CN115519083A (en) * | 2022-08-26 | 2022-12-27 | 江苏利淮钢铁有限公司 | Method for controlling surface quality of 15CrMoG continuous casting square billet of tube blank steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113857449A (en) * | 2021-09-14 | 2021-12-31 | 湖南华菱涟源钢铁有限公司 | Preparation method of oriented silicon steel casting blank and casting blank system |
| CN113857449B (en) * | 2021-09-14 | 2023-10-10 | 湖南华菱涟源钢铁有限公司 | Preparation method of oriented silicon steel casting blank and casting blank system |
| CN113843402A (en) * | 2021-09-18 | 2021-12-28 | 山东钢铁股份有限公司 | Control method for internal solidification structure of gear steel ultra-large section round billet |
| CN115519083A (en) * | 2022-08-26 | 2022-12-27 | 江苏利淮钢铁有限公司 | Method for controlling surface quality of 15CrMoG continuous casting square billet of tube blank steel |
| CN115519083B (en) * | 2022-08-26 | 2024-05-10 | 江苏利淮钢铁有限公司 | Control method for surface quality of 15CrMoG continuous casting square billet of tube blank steel |
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