CN110216259A - Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method - Google Patents
Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method Download PDFInfo
- Publication number
- CN110216259A CN110216259A CN201910661006.6A CN201910661006A CN110216259A CN 110216259 A CN110216259 A CN 110216259A CN 201910661006 A CN201910661006 A CN 201910661006A CN 110216259 A CN110216259 A CN 110216259A
- Authority
- CN
- China
- Prior art keywords
- rail
- continuous casting
- steel
- web
- homogenieity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Metal Rolling (AREA)
Abstract
Disclosed by the invention is a kind of Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method of field of steel metallurgy, focusing on the continuous casting stage is controlled using following steps: Stirring During Continuous Casting uses continuous casting two cold electromagnetic agitation, specific installation site is to stir magnetic field strength control 300 × 10 apart from the section crystallizer rigid 5.0~6.0m of liquid level‑4~400 × 10‑4T；Middle packet casting superheat of liquid steel is by 15~25 DEG C of execution；Continuous casting two cold cooling water inflow presses 0.20~0.23L/kg of specific waterSteelIt executes, solidification end drafts is not less than 9.0mm.It is controlled according to above-mentioned parameter, so that casting blank solidification tissue composition is well controlled, column crystal is more flourishing, and crystalline style is thin and fine and close, equiax crystal (the short crystalline style of crystal grain is thick) area's area reduces, slab C element is segregated curve and develops gently, and without the segregation alternating of negative and positive by a relatively large margin, rail homogenieity is high, web of the rail center segregation line is few and short, preferably, web of the rail consistency is higher, has achieved the purpose that homogenieity cooperates with raising with compactness for center segregation control.
Description
Technical field
The present invention relates to field of steel metallurgy more particularly to a kind of Properties of Heavy Rail Steel homogenieity and web of the rail consistency to promote controlling party
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.It is right
For Properties of Heavy Rail Steel, improves being uniformly distributed for rail solute element and have to rail base material tissue and welding heat affected zone organizational controls
It is significant.
Summary of the invention
To overcome existing Properties of Heavy Rail Steel entirety degree of segregation larger, the deficiencies such as web of the rail consistency is low are to be solved by this invention
Technical problem is: providing a kind of control method that can improve Properties of Heavy Rail Steel homogenieity.
The technical solution adopted by the present invention to solve the technical problems is:
Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control 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 continuous casting two cold electromagnetic agitation, and specific installation site is apart from the rigid liquid level 5.0 of crystallizer
The section~6.0m, stirring magnetic field strength control is 300 × 10-4~400 × 10-4T, do not put into operation M-EMS and solidification
End electromagnetic agitation；
B, continuous casting two cold: for the intensity of secondary cooling used for Qiang Leng, specific cooling water inflow presses 0.20~0.23L/kg of specific waterSteelIt holds
Row；
C, solidification end is depressed: implementing to depress to continuous casting billet, overall reduction is not less than 9.0mm；
D, 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 15~25 DEG C.
Further, the section of the Properties of Heavy Rail Steel is 280mm × 380mm, it is suitable for including at least U71Mn, U78CrV
It is produced with the heavy rail of U75V kind.
Further, the solidification end pressure demands pressure originates in Coagulated hemothorax previous group pressure roller, solidification
After terminal depress 3~4 groups of pressure rollers, 1.5mm under first group of pressure roll-in, subsequent pressure roller drafts be followed successively by 1.0~2mm,
2.0~3.0mm, 4.0mm, 0.0~2.0mm.
Further, pulling speed of continuous casting is cooperated by 0.73~0.75m/min in continuous casting process, casting speed control fluctuates pole
Difference≤0.02m/min.
The beneficial effects of the present invention are: passing through conjunction for the control requirement that Properties of Heavy Rail Steel homogenieity and web of the rail consistency are promoted
Reason design Properties of Heavy Rail Steel continuous casting equips process system, cancels traditional M-EMS equipment, and uses two cold electromagnetic agitations,
And the technical datas systems such as suitable mixing position and region are studied and defined, and accurately execute in technical system of the invention
All other technical datas being related to, so that casting blank solidification tissue composition is well controlled, column crystal is more flourishing, brilliant
Bar is thin and fine and close, and equiax crystal (the short crystalline style of crystal grain is thick) area's area reduces, and slab C element is segregated curve and develops gentle, no larger amplitude
Negative and positive segregation alternating is spent, rail C element degree of segregation is smaller compared with difference, and rail homogenieity is high, and web of the rail center segregation line is few and short, in
Preferably, web of the rail consistency is higher for heart segregation control.
Specific embodiment
Below with reference to embodiment, the present invention is further described.
Properties of Heavy Rail Steel described herein refer to section be 280mm × 380mm square billet, be applicable to production U71Mn,
The heavy rail of the models such as 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 is promoted for Properties of Heavy Rail Steel homogenieity and web of the rail consistency
The needs of control provide scientific and reasonable and effective technical system, are related to critical equipment outfit and process matched therewith system body
System, studies and defines the technical parameter system to match with quality control requirements on this basis.Properties of Heavy Rail Steel homogenieity of the invention
And web of the rail consistency lifting control 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 continuous casting two cold electromagnetic agitation, and specific installation site is apart from the rigid liquid level 5.0 of crystallizer
The section~6.0m, stirring magnetic field strength control is 300 × 10-4~400 × 10-4T, do not put into operation M-EMS and solidification
End electromagnetic agitation；
B, continuous casting two cold: for the intensity of secondary cooling used for Qiang Leng, specific cooling water inflow presses 0.20~0.23L/kg of specific waterSteelIt holds
Row；
C, solidification end is depressed: implementing to depress to continuous casting billet, overall reduction is not less than 9.0mm；
D, 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 15~25 DEG C.
The entire technical process of Rail Production has been comparative maturity, and the main distinction is the key in technical process
On process system and state modulator.The application substitutes original M-EMS using two cold electromagnetic agitations, and synthesis is set
Meter studies specific mixing position (region), further matching and suitable stirring technique parameter, mainly are as follows: stirring magnetic field strength,
Power frequency；The distribution of the research continuous casting process slab liquid heart is to match suitable secondary cooling zone domain covering；Furthermore research matching is to be suitable for
The parameters such as the degree of superheat, Water Rate for Secondary Cooling Water, to realize bloom Properties of Heavy Rail Steel casting blank solidification process control；Research matching science pressure work
Skill system is compared according to a large number of experiments, is controlled according to the parameter, Properties of Heavy Rail Steel to realize that Properties of Heavy Rail Steel slab center porosity is controlled
This is kind obvious for rail homogenieity, and the web of the rail center segregation line after rolling substantially mitigates, and center porosity is controlled very well, is reached
Homogenieity cooperates with the purpose improved with compactness under the conditions of economical and practical.
Other than above-mentioned core technology, to reach better continuous casting effect, it is also necessary to pulling speed of continuous casting and reduction distribution
Cooperation control, specifically, pulling speed of continuous casting is cooperated by 0.73~0.75m/min in continuous casting process, casting speed control fluctuation is very poor
Value≤0.02m/min.Originate in Coagulated hemothorax previous group pressure roller in solidification end pressure demands pressure, is pressed after Coagulated hemothorax
Lower 3~4 groups of pressure rollers, 1.5mm under first group of pressure roll-in, subsequent pressure roller drafts be followed successively by 1.0~2mm, 2.0~
3.0mm, 4.0mm, 0.0~2.0mm.
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 present invention uses continuous casting two cold electromagnetic agitation, specific to pacify
Holding position is to stir magnetic field strength control 300 × 10 apart from the section crystallizer rigid 5.0~6.0m of liquid level-4~330 × 10-4T,
Do not put into operation M-EMS and solidification end electromagnetic agitation；(2) continuous casting two cold: the present invention uses two cold for weak two cold sides
Formula, specific intensity of cooling press 0.20~0.21L/kg of specific waterSteelIt executes；(3) solidification end is depressed: solidification end pressure originates in
2# withdrawal straightening machine, terminates at 6# withdrawal straightening machine, each group pressure practical drafts of roller be respectively as follows: 1.5mm, 1.0~1.5mm, 2.4~
2.7mm, 4mm, 1.5mm, 10.4~11.2mm of overall reduction；(4) packet superheat of liquid steel in: packet superheat of liquid steel in continuous casting process
Control is at 19~25 DEG C；(5) control of continuous casting Actual Casting Speed fluctuates very poor value≤0.01m/ in 0.73~0.74m/min, pulling rate
min。
Solidified structure inspection is carried out to test slab, from slab leptoprosopy to slab center position, slab column crystal is ended in
Apart from 80~95mm of leptoprosopy, equiax crystal head of district's shaft length is 100~130mm, and crystal grain is short and small, and crystalline style tissue is thin and fine and close；To casting
Base carries out 5mm drill bit and bores sample defect strengthening examining, and C element degree of segregation develops that transition is gentle, without by a relatively large margin " it is negative-just-
Negative-just " segregation alternating；Rail is rolled into the Properties of Heavy Rail Steel slab using this technology invention production, the high direction of rail rail is carried out
It is sliced spectrum direct-reading inspection and macroscopic examination, the very poor control of rail C element degree of segregation is 0.03~0.05, center segregation line length
The sum of be 4~8mm, single segregation line length be 2~4mm；Web of the rail consistency is greater than 0.924 (1.0 be absolutely fine and close).
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 present invention uses continuous casting two cold electromagnetic agitation, specifically
Installation site is to stir magnetic field strength control 348 × 10 apart from the section crystallizer rigid 5.0~6.0m of liquid level-4~370 × 10- 4T, do not put into operation M-EMS and solidification end electromagnetic agitation；(2) continuous casting two cold: the present invention uses two cold for weak two
Cold mode, specific intensity of cooling press 0.21~0.23L/kg of specific waterSteelIt executes；(3) solidification end is depressed: originating in 2# straightening
Machine, terminates at 5# withdrawal straightening machine, each group pressure practical drafts of roller be respectively as follows: 1.5mm, 1.5~1.9mm, 2.0~2.4mm,
4.0mm, 9.0~9.8mm of overall reduction；(4) packet superheat of liquid steel in: the control of packet superheat of liquid steel is 15~21 in continuous casting process
℃；(5) control of continuous casting Actual Casting Speed fluctuates very poor value≤0.02m/min in 0.73~0.74m/min, pulling rate.
Solidified structure inspection is carried out to test slab, from slab leptoprosopy to slab center position, slab column crystal is ended in
Apart from 83~96mm of leptoprosopy, equiax crystal head of district's shaft length is 95~118mm, and crystal grain is short and small, and crystalline style tissue is thin and fine and close；To slab
Carry out 5mm drill bit and bore sample defect strengthening to examine, C element degree of segregation develops that transition is gentle, without by a relatively large margin " it is negative-just-it is negative-
Just " segregation alternating；Rail is rolled into the Properties of Heavy Rail Steel slab using this technology invention production, the high direction of rail rail is sliced
Spectrum direct-reading inspection and macroscopic examination, the very poor control of rail C element degree of segregation is 0.03~0.06, the sum of center segregation line length
For 4~7mm, single segregation line length is 3~4mm；Web of the rail consistency is greater than 0.921 (1.0 be absolutely fine and close).
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 present invention uses continuous casting two cold electromagnetic agitation, specific to pacify
Holding position is to stir magnetic field strength control 384 × 10 apart from the section crystallizer rigid 5.0~6.0m of liquid level-4~400 × 10-4T,
Do not put into operation M-EMS and solidification end electromagnetic agitation；(2) continuous casting two cold: the present invention uses two cold for weak two cold sides
Formula, specific intensity of cooling press 0.22~0.23L/kg of specific waterSteelIt executes；(3) solidification end is depressed: originating in 2# withdrawal straightening machine, eventually
Terminate in 6# withdrawal straightening machine, each group pressure practical drafts of roller be respectively as follows: 1.5mm, 1.3~1.4mm, 2.5~3.0mm, 4.0mm,
2.0,11.1~11.9mm of overall reduction；(4) packet superheat of liquid steel in: the control of packet superheat of liquid steel is 18~25 in continuous casting process
℃；(5) control of continuous casting Actual Casting Speed fluctuates very poor value≤0.01m/min in 0.74~0.75m/min, pulling rate.
Solidified structure inspection is carried out to test slab, from slab leptoprosopy to slab center position, slab column crystal is ended in
Apart from 82~96mm of leptoprosopy, equiax crystal head of district's shaft length is 97~117mm, and crystal grain is short and small, and crystalline style tissue is thin and fine and close；To slab
Carry out 5mm drill bit and bore sample defect strengthening to examine, C element degree of segregation develops that transition is gentle, without by a relatively large margin " it is negative-just-it is negative-
Just " segregation alternating；Rail is rolled into the Properties of Heavy Rail Steel slab using this technology invention production, the high direction of rail rail is sliced
Spectrum direct-reading inspection and macroscopic examination, the very poor control of rail C element degree of segregation is 0.03~0.05, the sum of center segregation line length
For 4~6mm, single segregation line length is 2~4mm；Web of the rail consistency is greater than 0.932 (1.0 be absolutely fine and close).
Above-described embodiment illustrates that casting blank solidification tissue, which forms, well to be controlled using the Properties of Heavy Rail Steel of the technology of the present invention production
System, column crystal is more flourishing, and crystalline style is thin and fine and close, and equiax crystal (the short crystalline style of crystal grain is thick) area's area reduces, and the segregation of slab C element is bent
Line develops gently, without the segregation alternating of negative and positive by a relatively large margin；Rail C element degree of segregation is smaller compared with difference, and rail homogenieity is high, the web of the rail
Center segregation line is few and short, and preferably, web of the rail consistency is higher for center segregation control.
Claims (4)
1. Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method, including following technique is successively carried out, converter smelting, LF furnace
Refining, RH vacuum, continuous casting, heating and rolling, characterized in that controlled in the continuous casting stage using following technique:
A, Stirring During Continuous Casting: using continuous casting two cold electromagnetic agitation, specific installation site be apart from the rigid liquid level of crystallizer 5.0~
The section 6.0m, stirring magnetic field strength control is 300 × 10-4~400 × 10-4T, do not put into operation M-EMS and solidification end
Hold electromagnetic agitation；
B, continuous casting two cold: for the intensity of secondary cooling used for Qiang Leng, specific cooling water inflow presses 0.20~0.23L/kg of specific waterSteelIt executes；
C, solidification end is depressed: implementing to depress to continuous casting billet, overall reduction is not less than 9.0mm；
D, 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 15~25 DEG C.
2. Properties of Heavy Rail Steel homogenieity as described in claim 1 and web of the rail consistency lifting control method, it is characterized in that: the heavy rail
The section of steel is 280mm × 380mm, and the heavy rail suitable for including at least U71Mn, U78CrV and U75V kind produces.
3. Properties of Heavy Rail Steel homogenieity as described in claim 1 and web of the rail consistency lifting control method, it is characterized in that: the solidification
Pressure demands pressure in end originates in Coagulated hemothorax previous group and depresses roller, 3~4 groups of pressure rollers of pressure after Coagulated hemothorax, and first
Group pressure roll-in under 1.5mm, subsequent pressure roller drafts be followed successively by 1.0~2.0mm, 2.0~3.0mm, 4.0mm, 0.0~
2.0mm。
4. Properties of Heavy Rail Steel homogenieity as described in claim 1 and web of the rail consistency lifting control method, it is characterized in that: continuous casting process
Middle pulling speed of continuous casting is cooperated by 0.73~0.75m/min, and casting speed control fluctuates very poor value≤0.02m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910661006.6A CN110216259A (en) | 2019-07-22 | 2019-07-22 | Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910661006.6A CN110216259A (en) | 2019-07-22 | 2019-07-22 | Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110216259A true CN110216259A (en) | 2019-09-10 |
Family
ID=67812590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910661006.6A Pending CN110216259A (en) | 2019-07-22 | 2019-07-22 | Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110216259A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57100854A (en) * | 1980-12-17 | 1982-06-23 | Toshiba Corp | Method for controlling electromagnetic stirring of continuous casting installation |
| CN101036921A (en) * | 2007-04-20 | 2007-09-19 | 攀枝花钢铁(集团)公司 | Dynamic soft reduction process for continuous casting of heavy rail steel bloom |
| CN104942252A (en) * | 2015-07-23 | 2015-09-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving internal quality of heavy-rail steel blooms |
| 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 |
| CN107552752A (en) * | 2017-10-27 | 2018-01-09 | 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 steady quality control method |
-
2019
- 2019-07-22 CN CN201910661006.6A patent/CN110216259A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57100854A (en) * | 1980-12-17 | 1982-06-23 | Toshiba Corp | Method for controlling electromagnetic stirring of continuous casting installation |
| CN101036921A (en) * | 2007-04-20 | 2007-09-19 | 攀枝花钢铁(集团)公司 | Dynamic soft reduction process for continuous casting of heavy rail steel bloom |
| CN104942252A (en) * | 2015-07-23 | 2015-09-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving internal quality of heavy-rail steel blooms |
| 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 |
| CN107552752A (en) * | 2017-10-27 | 2018-01-09 | 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 steady quality control method |
Non-Patent Citations (2)
| Title |
|---|
| 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 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105312525B (en) | Method for reducing ingot type segregation of 40Cr cold heading steel wire rod | |
| CN109940140A (en) | A method of improving hypo-peritectic steel center segregation of casting blank quality | |
| CN110303124A (en) | Large section Properties of Heavy Rail Steel casting blank solidification tissue improves control method | |
| CN110527816A (en) | A kind of heat treatment method reducing rail fatigue crack growth rate | |
| WO2024037063A1 (en) | High-carbon steel wire rod and production method therefor | |
| CN110453149A (en) | A kind of high-intensity fine rolling screw-thread steel and its production technology | |
| CN107186185A (en) | A kind of two phase stainless steel double roll strip casting rolling production process | |
| CN110303125A (en) | Bloom Properties of Heavy Rail Steel homogenieity cooperates with lifting control method with compactness | |
| CN110303131A (en) | Large section Properties of Heavy Rail Steel disperse is segregated control method | |
| CN113084110B (en) | Method for reducing carbon segregation of alloy steel | |
| CN110216253A (en) | Bloom Properties of Heavy Rail Steel disperse is segregated control method | |
| CN110216254A (en) | Properties of Heavy Rail Steel homogenieity improves control method | |
| CN110216256A (en) | Properties of Heavy Rail Steel tunneling boring homogenieity and web of the rail consistency control method | |
| CN110303130A (en) | Properties of Heavy Rail Steel homogenieity lifting control method | |
| CN100336617C (en) | Method for using hot-rolled steel plate to produce and steel cylinder by using continuously casting and rolling thin steel blanket | |
| CN109317628A (en) | YQ450NQR1 Yi shape steel bloom corner crack control method | |
| CN110216259A (en) | Properties of Heavy Rail Steel homogenieity and web of the rail consistency lifting control method | |
| CN109175279B (en) | YQ450NQR 1B-shaped steel bloom continuous casting production method | |
| CN110385412B (en) | Continuous casting method for controlling liquation of TiN in titanium-containing microalloyed steel | |
| CN110280733A (en) | Large section heavy rail rail head region homogenieity lifting control method | |
| CN110280732A (en) | Large section Properties of Heavy Rail Steel homogenieity cooperates with lifting control method with compactness | |
| CN110216252A (en) | Bloom heavy rail rail head region homogenieity method for improving | |
| CN110508763A (en) | Large section Properties of Heavy Rail Steel microsegregation control method | |
| CN109382490B (en) | YQ450NQR 1B-shaped steel bloom surface quality control method | |
| CN107008869A (en) | The production method of heavy rail steel continuous casting billet is produced using continuous cast mold |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190910 |
|
| RJ01 | Rejection of invention patent application after publication |