CN106755900A - High-strength and high ductility bainite rail and its in the cold technique of line traffic control - Google Patents
High-strength and high ductility bainite rail and its in the cold technique of line traffic control Download PDFInfo
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- CN106755900A CN106755900A CN201710098695.5A CN201710098695A CN106755900A CN 106755900 A CN106755900 A CN 106755900A CN 201710098695 A CN201710098695 A CN 201710098695A CN 106755900 A CN106755900 A CN 106755900A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B5/00—Rails; Guard rails; Distance-keeping means for them
- E01B5/02—Rails
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Abstract
The present invention provides a kind of high-strength and high ductility bainite rail and its in the cold technique of line traffic control.It is above-mentioned to include in the cold technique of line traffic control：The finishing temperature of bainite rail is 850~930 DEG C, rail is carried out cold in line traffic control, is divided into following three stage line traffic control is cold：When first stage, finishing temperature are to 360~390 DEG C, cooling rate are set and are more than 0.4 DEG C/s, the waste heat rail after finish to gauge is accelerated to be cooled to stopping cooling when rail head tread central temperature is 360~390 DEG C；Second stage, 360~390 DEG C to 180~210 DEG C when, set cooling rate in 0.07~0.2 DEG C/s；Phase III, 180~210 DEG C to align when, natural air cooling.It is above-mentioned in the cold technique of line traffic control according to bainitic transformation law formulation, simple possible can be suitably used for industrialized production.Thus the bainite rail microscopic structure for preparing more is refined, and martensite content is less, and retained austenite is more stablized, the bainite rail excellent in mechanical performance.
Description
Technical field
The present invention relates to the production technical field of railway track, more particularly to a kind of high-strength and high ductility bainite rail and its
The cold technique of line traffic control.
Background technology
Each Rail Production producer of fast development requirement of Chinese Railway constantly lifts rail quality, expects that rail is obtained more
High-caliber wearability and plasticity, the pearlite steel rail for commonly using at present, its is strong the characteristics of due to its composition and institutional framework
Toughness performs to the limit substantially, and impact flexibility, fracture toughness are relatively low.And bainite rail have good intensity, plasticity,
Impact flexibility, wearability, resistance to rolling contact fatigue performance, enjoy the favor of whole world various countries.
Since last century the eighties, including including China, multiple country of the world has carried out the bainite of various ingredients
The development and exploitation of rail, mostly use in, low carbon content design, be aided with the units such as appropriate Si, Mn, Cr, Ni, Mo, V, Nb, B
Element, directly obtains based on bainite structure under the conditions of continuous coo1ing in atmosphere, at the same comprising retained austenite, martensite or
The Multiphase Steel of M/A islands, carbide etc..Because each chemical composition of bainite rail, rail type difference, cooling condition are different, cause shellfish
Tissue morphology in family name's body rail varies, and bainite rail is had different obdurability levels, especially bainitic steel
Upper bainite, bulk M/A islands, unstable residual austenite, thick carbide etc. should be avoided the occurrence of in rail tissue, as unstable
Residual austenite knows from experience easy strain induced martensite phase transformation, and thick carbide can reduce the fatigue behaviour of rail.
As the J6 bainite rails in the U.S., hot rolled rail intensity rank reach 1400MPa, rail head elongation percentage is only 5.0%,
The contraction percentage of area 6.4%.The raising of intensity rank is mainly that alloying element content is too high, especially improves the element M n of quenching degree
+ Cr has reached 3.94wt%, rolls the martensite that higher proportion occurs in state tissue.
It is multiple that the patent application of Publication No. CN103243275B provides a kind of rail bainite/martensite/austenite
The preparation method of phase high-strength steel, contains a large amount of martensites in its metallographic structure, bainite volume fraction is only 20-50%, if
Residual stress is big after rail is rectified, and rail is caused cracking in use, and to stablize this complex phase structure of steel, eliminate remaining
Stress, at 200-350 DEG C being incubated 6-60 hours also by rail carries out tempering stabilization processes, and a small amount of unstable residual
Remaining austenite is likely to occur martensite transfor mation, causes performance inconsistency.
The patent application of Publication No. CN101921971A provides curve and heavy-duty steel rail bainitic steel and bainite
Rail and its production method, in order that rail property stabilization is also needed to reheat, cooled down, time-consuming and power consumption.
Publication No. CN103160736A, CN102021481A, the patent application of CN102534403A both provide bayesian
The heat treatment method of body rail, 350-200 DEG C, subsequent air cooling are as cold as after only highlighting rail finish to gauge eventually with cooling rate scope wider
To room temperature, cooling rate scope is too wide, does not evade the temperature range that upper bainite or thick M/A islands are likely to occur during rail is cooled down,
Cause the uncertainty of the diversity of phase composition in bainite rail and phase content, the unstable of performance can be caused.
The patent application of Publication No. CN103966520A provide a kind of bainite rail containing micro carbide and
Its production method, although 220-240 DEG C is cooled to rail acceleration after rolling, but also rail is placed in 300-350 DEG C of tempering furnace
Tempering 4-6h, using online+offline method for developing simultaneously, man-hour is long, and low production efficiency increased the difficulty of industrial mass production
Degree.
There is following technical problem in bainite rail heat treatment involved by above-mentioned patent：The tissue morphology of bainite rail
With obdurability it is difficult to match, burning optimization on line control it is cold without Proper Match cooling velocity and scope, in not evading rail cooling
The temperature range on upper bainite or thick M/A islands is likely to occur, Technology for Heating Processing also is complicated, is unfavorable for that industrialization is extensive
Quality stability.
The content of the invention
In view of this, the present invention provides a kind of high-strength and high ductility bainite rail and its in the cold technique of line traffic control.
First, the present invention provide a kind of high-strength and high ductility bainite rail in the cold technique of line traffic control, it includes：
The finishing temperature of bainite rail be 850~930 DEG C, the rail is carried out it is cold in line traffic control, it is described cold in line traffic control
It is divided into following three stage：
When first stage, finishing temperature are to 360~390 DEG C, cooling rate are set and are more than 0.4 DEG C/s, by the waste heat steel after finish to gauge
Rail accelerates to be cooled to and stops cooling down when rail head tread central temperature is 360~390 DEG C；
Second stage, 360~390 DEG C to 180~210 DEG C when, set cooling rate in 0.07~0.2 DEG C/s；
Phase III, 180~210 DEG C to align when, natural air cooling.
Further, the mode for being cooled down in the first stage is air-cooled or Areoponics culture.
Further, the alloying component system of the bainite rail is C-Si-Mn-Cr-Mo, or contains Ni or microalloy
Element nb, V, Ti, B, RE.
Further, Mn and Cr element total contents meet claimed below in the bainite rail：2.50wt%≤Mn+Cr
≤ 3.50wt%.
Accordingly, the present invention also provides a kind of high-strength and high ductility bainite rail, according to above-mentioned any one institute after its rolling
That states is obtained after the cold technique of line traffic control.
Further, the rail head position tensile strength >=1400MPa of the rail, elongation percentage >=13.0%, room temperature condition
The lower U-shaped impact >=100J of rail head, rail head tread hardness >=400HB.
Further, based on tiny lath of bainite tissue, its volume content is 70~80% to the rail, and simultaneously
It is 8~15% film-form retained austenites containing volume ratio.
The present invention provides a kind of high-strength and high ductility bainite rail and its in the cold technique of line traffic control.It is above-mentioned the cold technique of line traffic control according to
Bainitic transformation law formulation, simple possible, and can be suitably used for industrialized production.Thus the high-strength and high ductility bainite rail for preparing
Microscopic structure is more refined, and martensite content is less, and retained austenite is more stablized, and is had under same carbon content preferably tough
Change matching, the bainite rail excellent in mechanical performance meets existing railroad industry standard requirement.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described.
Fig. 1 is the microstructure picture of the bainite rail that the embodiment of the present invention 1 is obtained；
Fig. 2 is the microstructure picture of the bainite rail that the embodiment of the present invention 4 is obtained.
Specific embodiment
The invention discloses a kind of high-strength and high ductility bainite rail and its in the cold technique of line traffic control, those skilled in the art can be with
Present disclosure is used for reference, technological parameter realization is suitably modified.In particular, all similar replacements and change are to ability
It is it will be apparent that they are considered as being included in the present invention for field technique personnel.The method of the present invention and application have been led to
Cross preferred embodiment to be described, related personnel can be not substantially being departed from present invention, spirit and scope to this paper institutes
The methods and applications stated are modified or suitably change is realized and apply the technology of the present invention with combining.
The present invention provide a kind of high-strength and high ductility bainite rail in the cold technique of line traffic control, it includes：
The finishing temperature of bainite rail be 850~930 DEG C, the rail is carried out it is cold in line traffic control, it is described cold in line traffic control
It is divided into following three stage：
When first stage, finishing temperature are to 360~390 DEG C, cooling rate are set and are more than 0.4 DEG C/s, by the waste heat steel after finish to gauge
Rail accelerates to be cooled to and stops cooling down when rail head tread central temperature is 360~390 DEG C；
Second stage, 360~390 DEG C to 180~210 DEG C when, set cooling rate in 0.07~0.2 DEG C/s；
Phase III, 180~210 DEG C to align when, natural air cooling.
The reason for finishing temperature that the present invention sets bainite rail is 850~930 DEG C is as follows：
Research shows, when bainite rail finishing temperature is more than 930 DEG C, even if using the element of the crystal grain thinnings such as Nb, V,
It organizes crystal grain thicker after rolling, and is unfavorable for refining lath of bainite, influences the impact flexibility particularly low-temperature impact toughness of rail.
As finishing temperature is less than 850 DEG C, although can refine and roll rear grain size, deformation of rail stress is big, is unfavorable for the aligning of rail, can
The residual stress of rail can be improved, the flatness of rail is influenceed.The finishing temperature of bainite rail is more preferably in the present invention
880 DEG C~920 DEG C.
The present invention sets as follows in the cold three stages reason of line traffic control after rail rolls in the manner described above：
Roll under the conditions of rear air cooling, the starting temperature of transformation of bainite rail is general between 350~450 DEG C, the present inventor
Research shows：As bainite starts phase transition temperature higher than 390 DEG C, upper bainite or thick M/A islands occur in room temperature texture,
Finally influence its impact flexibility；Importantly, while rail head of rail top layer is subject to extraneous cooling medium to cool down, also from
The heat at rail head center portion and web of the rail position will by heat transfer to rail head top layer spread, such as do not take roll after accelerate cool down work
Skill, rail head of rail is extremely difficult to relatively low bainitic transformation started temperature, and rail head center portion due to heat exchange not in time, phase transformation
Cold degree is small, and bainitic transformation is insufficient, easily produces thick bainite structure or substantial amounts of martensite.Terminate when cooling is accelerated
Temperature is less than 360 DEG C, and the bainite transformation time shortens, so the first stage of bainite rail cooling control after rolling technique is for after finish to gauge
Stop cooling when rail more than 0.4 DEG C/s cooling rates to accelerate to be as cold as 360~390 DEG C.The cooling rate of first stage is preferably 0.4~
0.6 DEG C/s, final cooling temperature is preferably 360~383 DEG C.
Because bainitic transformation is half diffusion phase transformation, the overcooling austenite for first changing is arranged to the overcooling austenite area not changed
Carbon, phase transformation needs the regular hour, and the austenite carbon content only not changed reaches finite concentration, and its stability can just strengthen,
It is not easily decomposed at room temperature, becomes the retained austenite of stabilization, the impact flexibility of rail can be greatly improved.Present invention research table
It is bright：Different according to rail type, cooling rate is controlled in the range of 0.07~0.2 DEG C/s, at room temperature lower bainite volume in bainite rail
Content can reach 70~80%, and the combination property of the rail is optimal, so the second stage technique for controlling cold technique is：360~
390 DEG C to 180~210 DEG C, those skilled in the art can be cold according to the shellfish rail rail type for being produced and required bainite content
Speed control is between 0.07~0.2 DEG C/s.Preferably, the cooling rate of second stage is 0.08~0.12 DEG C/s, and final cooling temperature is 183
~203 DEG C.
Present invention research shows：When rail temperature is reduced to 180~210 DEG C, phase transformation is basically completed, and allows it to be air cooled to room temperature
Until aligning, Slow cooling can suitably reduce its transformation stress.
Preferably, the mode for being cooled down in the first stage is air-cooled or Areoponics culture.
Used as preferred scheme of the invention, the alloying component system of above-mentioned bainite rail is C-Si-Mn-Cr-Mo, or is contained
There are Ni or microalloy element Nb, V, Ti, B, RE.
Preferably, Mn and Cr element total contents meet claimed below in the bainite rail：2.50wt%≤Mn+Cr≤
3.50wt%.I.e. Mn and Cr elements total content is 2.50~3.50wt%
Accordingly, the present invention also provides a kind of high-strength and high ductility bainite rail, and it is according to the above-mentioned cold work of control after rolling
It is obtained after skill cooling.
Preferably, the rail head position tensile strength >=1400MPa of the rail, elongation percentage >=13.0%, under room temperature condition
U-shaped impact >=the 100J of rail head, rail head tread hardness >=400HB.
Further, based on tiny lath of bainite tissue, its volume content is 70~80% to the rail, and simultaneously
It is 8~15% film-form retained austenites containing volume ratio.
The present invention provide a kind of high-strength and high ductility bainite rail in the cold technique of line traffic control and high-strength and high ductility bainite rail.
The above-mentioned cold technique of control can be suitably used for industrialized production according to bainitic transformation law formulation, simple possible.Thus prepare
High-strength and high ductility bainite rail microscopic structure is more refined, and martensite content is less, and retained austenite is more stablized, and same carbon contains
Amount is lower with the matching of more preferable Strengthening and Toughening, and the bainite rail excellent in mechanical performance meets existing railroad industry standard requirement.
With reference to embodiment, the present invention is expanded on further：
Embodiment 1-6
The composition (wt%) of bainite rail is as follows in six groups of embodiments below：C：0.12~0.40, Si：0.50~
1.50, Mn：1.50~2.50, Cr：0.50~1.50, Ni：0~1.20, Mo：0.20~0.50, A1：0.02~0.08, S：≤
0.010, P：≤ 0.015, remaining is ferro element and inevitable impurity.
Bainite rail in the cold technique of line traffic control refers to table 1.
The bainite rail of table 1 in the cold technological parameter of line traffic control
Note：Phase III cooling rate is all natural air cooling in all implementations.
The room-temperature mechanical property of the bainite rail after above-mentioned implementation cooling refers to table 2.
The room-temperature mechanical property of the bainite rail of table 2
| Embodiment | Rp0.2(MPa) | Rm(MPa) | A (%) | KU2(room temperature, J) | Hardness (HB) |
| 1 | 1108 | 1430 | 16.0 | 120 | 408 |
| 2 | 1213 | 1470 | 15.0 | 108 | 424 |
| 3 | 1280 | 1523 | 13.0 | 101 | 430 |
| 4 | 1083 | 1405 | 17.0 | 131 | 403 |
| 5 | 1050 | 1415 | 17.0 | 124 | 410 |
| 6 | 1074 | 1410 | 18.0 | 140 | 400 |
The embodiment of the present invention 1 and 4 in the cold technique lower bainite rail microstructure picture of line traffic control refers to Fig. 1 and Fig. 2.
It can be seen that more being refined using the bainite rail microscopic structure obtained in the cold technique of line traffic control that the present invention is provided, bayesian
Body width of sheet is about 100~300nm, and its volume content is about 70~80%.Martensite content is less, and retained austenite is more
Stabilization, the volume content 8~15% of film-form retained austenite, thickness is about 5~15nm.
As shown in the above, in the bainite rail that the cold technique of line traffic control for being provided using the present invention is obtained, bainite group
Knit and more refine, martensite content is less, retained austenite is more stablized, there is more preferable Strengthening and Toughening under same carbon content
Match somebody with somebody.It is demonstrated experimentally that the rail head position tensile strength >=1400MPa of the bainite rail, elongation percentage >=13.0%, under room temperature condition
U-shaped impact >=the 100J of rail head, rail head tread hardness >=400HB, therefore the bainite rail excellent in mechanical performance, meet existing iron
Road Industry code requirements.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of high-strength and high ductility bainite rail in the cold technique of line traffic control, it is characterised in that including：
The finishing temperature of bainite rail is 850~930 DEG C, the rail is carried out it is cold in line traffic control, it is described to be divided into line traffic control is cold
Three stage below：
When first stage, finishing temperature are to 360~390 DEG C, cooling rate are set and are more than 0.4 DEG C/s, the waste heat rail after finish to gauge is added
Quickly cooling stops cooling when being 360~390 DEG C to rail head tread central temperature；
Second stage, 360~390 DEG C to 180~210 DEG C when, set cooling rate in 0.07~0.2 DEG C/s；
Phase III, 180~210 DEG C to align when, natural air cooling.
2. high-strength and high ductility bainite rail according to claim 1 in the cold technique of line traffic control, it is characterised in that described first
The mode cooled down in stage is air-cooled or Areoponics culture.
3. high-strength and high ductility bainite rail according to claim 1 in the cold technique of line traffic control, it is characterised in that the bayesian
The alloying component system of body rail is C-Si-Mn-Cr-Mo, or contains Ni or microalloy element Nb, V, Ti, B, RE.
4. high-strength and high ductility bainite rail according to claim 1 in the cold technique of line traffic control, it is characterised in that the bayesian
Mn and Cr elements total content meets claimed below in body rail：2.50wt%≤Mn+Cr≤3.50wt%.
5. a kind of high-strength and high ductility bainite rail, it is characterised in that according to described in Claims 1-4 any one after its rolling
After the cold technique of line traffic control be obtained.
6. high-strength and high ductility bainite rail according to claim 5, it is characterised in that the rail head position tension of the rail
Intensity >=1400MPa, elongation percentage >=13.0%, the U-shaped impact >=100J of rail head under room temperature condition, rail head tread hardness >=400HB.
7. strong high-ductility bainite rail according to claim 5, it is characterised in that the rail is with tiny lath of bainite
Based on tissue, its volume content is 70~80%, and it is 8~15% film-form retained austenites to contain volume ratio simultaneously.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016111502960 | 2016-12-14 | ||
| CN201611150296 | 2016-12-14 |
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| CN106755900A true CN106755900A (en) | 2017-05-31 |
| CN106755900B CN106755900B (en) | 2018-10-12 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385308A (en) * | 2017-06-28 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | The cooling controlling and rolling controlling process of railway high-strength wearable shellfish horse heterogeneous structure rail |
| CZ308108B6 (en) * | 2018-07-20 | 2020-01-08 | Univerzita Pardubice | Bainitic steel with increased contact-fatigue resistance |
| CN112375891A (en) * | 2020-10-20 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Online tempering process for eliminating bainite steel rail tensile fracture brittleness platform |
| CN112501518A (en) * | 2020-12-01 | 2021-03-16 | 青岛科技大学 | Bainite steel and preparation method and application thereof |
| CN112877531A (en) * | 2021-01-12 | 2021-06-01 | 包头钢铁（集团）有限责任公司 | Production control method for improving flatness of steel rail after online heat treatment quenching |
| CN113416818A (en) * | 2021-05-12 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment process of high-strength and high-toughness bainite/martensite multiphase bainite steel rail |
| CN113755670A (en) * | 2021-08-24 | 2021-12-07 | 中铁宝桥集团有限公司 | Quenching and cooling method for bainitic steel frog point rail |
| CN114317918A (en) * | 2021-12-28 | 2022-04-12 | 内蒙古科技大学 | High-toughness tissue quantitative control Baima complex phase heavy rail steel and preparation method thereof |
| CN114855082A (en) * | 2022-04-26 | 2022-08-05 | 包头钢铁（集团）有限责任公司 | Manufacturing method for improving low-temperature toughness of hot-rolled U75V steel rail by rare earth elements |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385308A (en) * | 2017-06-28 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | The cooling controlling and rolling controlling process of railway high-strength wearable shellfish horse heterogeneous structure rail |
| CZ308108B6 (en) * | 2018-07-20 | 2020-01-08 | Univerzita Pardubice | Bainitic steel with increased contact-fatigue resistance |
| CN112375891A (en) * | 2020-10-20 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Online tempering process for eliminating bainite steel rail tensile fracture brittleness platform |
| CN112501518A (en) * | 2020-12-01 | 2021-03-16 | 青岛科技大学 | Bainite steel and preparation method and application thereof |
| CN112877531A (en) * | 2021-01-12 | 2021-06-01 | 包头钢铁（集团）有限责任公司 | Production control method for improving flatness of steel rail after online heat treatment quenching |
| CN112877531B (en) * | 2021-01-12 | 2023-01-24 | 包头钢铁（集团）有限责任公司 | Production control method for improving flatness of steel rail after online heat treatment quenching |
| CN113416818A (en) * | 2021-05-12 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment process of high-strength and high-toughness bainite/martensite multiphase bainite steel rail |
| CN113755670A (en) * | 2021-08-24 | 2021-12-07 | 中铁宝桥集团有限公司 | Quenching and cooling method for bainitic steel frog point rail |
| CN113755670B (en) * | 2021-08-24 | 2022-10-25 | 中铁宝桥集团有限公司 | Quenching and cooling method for bainitic steel frog point rail |
| CN114317918A (en) * | 2021-12-28 | 2022-04-12 | 内蒙古科技大学 | High-toughness tissue quantitative control Baima complex phase heavy rail steel and preparation method thereof |
| CN114317918B (en) * | 2021-12-28 | 2023-09-22 | 内蒙古科技大学 | Beehive composite phase-change heavy rail steel with high strength and toughness tissue quantitatively controlled and preparation method thereof |
| CN114855082A (en) * | 2022-04-26 | 2022-08-05 | 包头钢铁（集团）有限责任公司 | Manufacturing method for improving low-temperature toughness of hot-rolled U75V steel rail by rare earth elements |
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