CN107557557A - A kind of burning optimization on line method for being used to eliminate rail abnormal structure - Google Patents
A kind of burning optimization on line method for being used to eliminate rail abnormal structure Download PDFInfo
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- CN107557557A CN107557557A CN201710664943.8A CN201710664943A CN107557557A CN 107557557 A CN107557557 A CN 107557557A CN 201710664943 A CN201710664943 A CN 201710664943A CN 107557557 A CN107557557 A CN 107557557A
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Abstract
The present invention relates to a kind of burning optimization on line method for being used to eliminate rail abnormal structure, it includes：Rail enters heat-treatment lines with not less than 780~680 DEG C temperature, and not less than 600 DEG C temperature are cooled to 5~15 DEG C/S cooling rate multistage；Rail is incubated, the soaking time time is more than 60~90S；Or higher than 470 DEG C temperature are cooled to 5~15 DEG C/S cooling rate multistage；Rail is heated to above 600 DEG C of temperature, insulation is no less than 60~90S, afterwards air cooling.This method is that the phase in version law formulation at position is segregated according to steel rail area, relation between generation and the control of heat-treatment of rail cooling technique based on martensite abnormal structure, show that the rail burning optimization on line cooling technique required for eliminating abnormal structure controls with cooling velocity, goes out the final cooling temperature of heat-treatment lines and the follow-up relation for reheating soaking time and temperature, eliminate abnormal martensite and bainite structure.
Description
Technical field
It is more particularly to a kind of to be used to eliminate at the online heat of rail abnormal structure the present invention relates to railway track production field
Reason method.
Background technology
As railway transportation is to high speed, heavy duty development, intensity and hardness to rail propose higher and higher requirement.It is logical
It is a kind of economically viable approach that Overheating Treatment, which is improved the obdurability of rail,.However, for heat-treated rail, to obtain
Obtain obdurability well, it is necessary to heat-treatment of rail hardened layer is obtained whole fine pearlite tissues, meanwhile, in the complete disconnected of rail
Must not have martensitic structure on face, it by influence heat-treated rail product quality stability and rail service life.
Carbon content is higher in known pearlite steel rail, thus its quenching degree is high, and the process of cooling is forced in heat-treatment of rail
In be easy to abnormal martensitic structure occur, therefore, abnormal martensitic structure elimination as heat-treatment of rail controlling difficulties it
One.By taking U71Mn heat-treated rails as an example, due to the higher (Mn of content of manganese in the steel grade:1.0~1.5%), manganese is increase steel
Quenching degree element so that the rail obtains the cooling velocity narrow range (0.5~5.5 DEG C/S) of whole fine pearlite tissues, so as to
The Technology for Heating Processing control difficulty of rail is considerably increased, meanwhile, the high easily generating region segregation of manganese content, cause local Ovshinsky
Body stabilizes, and is less useful for obtaining whole fine pearlite tissues.Further in order to improve the strength grade of heat-treated rail,
Generally use improves the content of carbon and manganese element or adds the microalloy elements such as chromium, niobium, vanadium, rare earth, and this causes the through hardening of rail
Property also further improves, meanwhile, the element such as carbon, manganese, chromium is more serious with the increase regional segregation of content, further increases out
The now possibility of abnormal martensitic structure.Once occurring martensitic structure in rail, then easily make rail crack initiation, induce early
Phase crackle, influence the service life of rail.
A large amount of heat-treated rail patents and document are consulted, two aspects are mainly grouped as, first, disclosing the heat treatment of rail
Device or producing line, second, the type of cooling for disclosing heat-treatment of rail includes but is not limited to cooling medium and cooling velocity scope
Deng, it is that rail is cooled down with cooling mediums such as wind, water smoke, wind+water smokes to sum up, and cooling control technique is different,
Purpose is all rail is obtained fine pearlite metallographic structure by heat treatment.Such as CN 1487111A heat treatment carbon steel
Rail steel discloses a kind of carbon rail steel for heat treatment, is to pass through Design of Chemical Composition the characteristics of the carbon rail steel for heat treatment
Avoid being also easy to produce the composition range of abnormal structure, so as to make rail obtain full fine pearlite in wider cooling velocity scope
Tissue, Technology for Heating Processing are easily controlled；The method and apparatus of CN85109735A heat-treatment of rail is disclosed using gas cooling
Medium cools down to the rail of different carbon equivalents by adjusting the spacing of cooling nozzles and rail's end portion, rail is reached not
Same strength grade；CN1920062A heat treatment method for steel rail and heat-treatment of rail unit are disclosed by secondary heat treatment to steel
Rail carries out pressure cooling, using compressed air cooling mode；CN1127790A steel rail in-line exhaust-heat strengthening process and its device disclose
Rail is heat-treated using water spray cooling mode, rail is specifically illustrated and enters the temperature range of annealing device, water smoke
Cooling velocity scope and cool time and rail go out the temperature range of heat-treatment lines self tempering temperature.
The content of the invention
In view of this, the present invention provides a kind of burning optimization on line method for being used to eliminate rail abnormal structure.
The present invention provides a kind of burning optimization on line method for being used to eliminate rail abnormal structure, and it includes：
Step 1), rail enter heat-treatment lines with not less than 780~680 DEG C temperature, cold with 5~15 DEG C/S cooling rate multistage
But arrive and be not less than 600 DEG C of temperature；
Step 2), rail is incubated, the soaking time time is more than 60~90S；It is or more with 5~15 DEG C/S cooling rate
Level is cooled to higher than 470 DEG C temperature；
Step 3), rail is heated to above to 600 DEG C of temperature, insulation is no less than 60~90S, afterwards air cooling.
Further, the speed of cooling is 5~8 DEG C/S in the step 1).
Further, the speed of cooling is 5~10 DEG C/S in the step 2)；It is cooled to 520~600 DEG C.
Further, in the rail：C content is 0.68~1.05wt%, and Si contents are 0.50~0.90wt%, and Mn contains
It is 0~1.00wt% to measure as 0.80~1.50wt%, Cr contents.
Further, in the rail：C content is 0.8~1.05wt%；Mn contents are 1.2~1.5wt%, Cr contents
It is not less than 2.5wt% for 0.8~1.00wt%, or Mn and Cr total contents；RE content is 0.00020wt%.
The present invention provides a kind of burning optimization on line method for being used to eliminate rail abnormal structure, and this method is according to rail area
Domain is segregated the phase in version law formulation at position, and the generation based on martensite abnormal structure controls it with heat-treatment of rail cooling technique
Between relation, draw eliminate abnormal structure required for rail burning optimization on line cooling technique control with cooling velocity, go out Re Chu
The final cooling temperature of line and the follow-up relation for reheating soaking time and temperature are managed, eliminates abnormal martensite and bainite structure.
This method has directive significance for the heat-treated rail for developing high intensity levels.This method simple possible, suitable for industrialization
Production.
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
There is the required accompanying drawing used in technology description to be briefly described.
Fig. 1 is tissue topography's figure of product prepared by the embodiment of the present invention 1；
Fig. 2 is tissue topography's figure of product prepared by the embodiment of the present invention 2；
Fig. 3 is tissue topography's figure of product prepared by the embodiment of the present invention 3；
Fig. 4 is tissue topography's figure of product prepared by comparative example 1 of the present invention；
Fig. 5 is tissue topography's figure of product prepared by comparative example 2 of the present invention；
Fig. 6 is tissue topography's figure of product prepared by comparative example 2 of the present invention；
Fig. 7 is tissue topography's figure of product prepared by comparative example 3 of the present invention；
Fig. 8 is tissue topography's figure of product prepared by comparative example 4 of the present invention；
Fig. 9 is tissue topography's figure of product prepared by comparative example 5 of the present invention.
Embodiment
The invention discloses a kind of burning optimization on line method for being used to eliminate rail abnormal structure, those skilled in the art can
To use for reference present disclosure, technological parameter realization is suitably modified.In particular, all similar replacements and change are to this
It is it will be apparent that they are considered as being included in the present invention for art personnel.The method of the present invention and application are
Be described by preferred embodiment, related personnel substantially can not depart from present invention, in spirit and scope to herein
Described methods and applications are modified or suitably changed with combining, to realize and using the technology of the present invention.
The technical problems to be solved by the invention are to provide a kind of rail burning optimization on line method, make the rail gold produced
Phase constitution is fine pearlite tissue, martensite and bainite structure without exception, so as to improve the service life of rail.
Present inventor research has shown that, be after heat treatment easy to the rail for martensitic structure occur, its chemical composition
Feature is containing elements such as higher carbon, manganese, chromium, is specifically included：0.68~1.05wt%C, 0.50~0.90wt%Si, 0.80
~1.50wt%Mn, 0~1.00wt%Cr, remaining is iron, other microalloy elements and impurity.Abnormal martensitic structure in rail
It is generally present in the upper and lower trigonum and web of the rail centre of rail.It is due to higher carbon, manganese, chromium to analyze its producing cause
Deng element, segregation easily is produced in the center portion of continuous casting billet, heredity is in the trigonum up and down of rail and web of the rail center line after rolling
Place, because the elements such as carbon, manganese, chromium play static stabilization to austenite, extends time of the austenite to perlitic transformation, steel
Rail is in heat treatment process, and under identical cooling condition, the perlitic transformation in these microsegregation regions is postponed, and is not changed
Austenite martensite transfor mation can occur as rail temperature further reduces.
Present inventor have studied between the generation of martensite abnormal structure and the control of heat-treatment of rail cooling technique
Relation, by experimental study, show that the rail burning optimization on line cooling technique control required for eliminating abnormal structure is fast with cooling down
Spend, go out the final cooling temperature of heat-treatment lines and the follow-up relation for reheating soaking time and temperature.
Thus, the present invention provides a kind of burning optimization on line method for being used to eliminate rail abnormal structure, it is characterised in that
Step 1), rail enter heat-treatment lines with not less than 780~680 DEG C temperature, cold with 5~15 DEG C/S cooling rate multistage
But arrive and be not less than 600 DEG C of temperature；
Step 2), rail is incubated, the soaking time time is more than 60~90S；It is or more with 5~15 DEG C/S cooling rate
Level is cooled to higher than 470 DEG C temperature；
Rail is heated to above 600 DEG C of temperature by step 3), and insulation is no less than 60~90S, afterwards air cooling.
Further, the speed of cooling is 5~8 DEG C/S in the step 1)；
Preferably, the speed of cooling is 5~10 DEG C/S in the step 2)；It is cooled to 520~600 DEG C.
As the preferred scheme of the present invention, in the rail：C content is 0.68~1.05wt%, Si contents are 0.50~
0.90wt%, Mn content are 0.80~1.50wt%, and Cr contents are 0~1.00wt%.
Further, in the rail：C content is 0.8~1.05wt%；Mn contents are 1.2~1.5wt%, Cr contents
It is not less than 2.5wt% for 0.8~1.00wt%, or Mn and Cr total contents；RE content is 0.00020wt%.
The present invention provides a kind of burning optimization on line method for being used to eliminate rail abnormal structure, and this method is according to rail area
Domain is segregated the phase in version law formulation at position, and the generation based on martensite abnormal structure controls it with heat-treatment of rail cooling technique
Between relation, draw eliminate abnormal structure required for rail burning optimization on line cooling technique control with cooling velocity, go out Re Chu
The final cooling temperature of line and the follow-up relation for reheating soaking time and temperature are managed, eliminates abnormal martensite and bainite structure.
The inventive method based on but be not limited to be easy to generating region segregation containing manganese, chromium steel rail, it is thus high-strength for developing
The heat-treated rail of degree rank has directive significance.This method simple possible, suitable for industrialized production.
With reference to embodiment, the present invention is expanded on further：
Embodiment 1
Table 1 lists the technological parameter and product histological test knot of the heat treatment process test of following examples and comparative example
Fruit.
The parameter and product tissue assay of the heat treatment test technique of table 1
Embodiment 1：
Rail enters heat-treatment lines temperature >=780~680 DEG C, is then cooled to 600 DEG C of insulations with 5 DEG C/S speed batch (-type)
Air cooling is to room temperature after 60~90S.Its histological test result is fine pearlite tissue, sees Fig. 1.
Embodiment 2：
Rail enters heat-treatment lines temperature >=780~680 DEG C, is then cooled to 520 DEG C with 10 DEG C/S speed batch (-type), then
It is heated rapidly to 600 DEG C, is incubated after 60~90S air cooling to room temperature.Its histological test result is complete fine pearlite tissue,
See Fig. 2.
Embodiment 3：
Rail enters heat-treatment lines temperature >=780~680 DEG C, then with 15 DEG C/S speed batch (-type) be as cold as respectively 490 DEG C,
470 DEG C, then 600 DEG C are heated rapidly to, room temperature is as cold as soon after being incubated 60S respectively.Its histological test result is fine pearlite, point
Do not see (a) and (b) in Fig. 3.
Comparative example 1：
Compared with embodiment 1, rail enters heat-treatment lines temperature >=780~680 DEG C, then with 5 DEG C/S speed batch (-type)
600 DEG C, after soaking time shortens to 45S by 90S are cooled to, its histological test result is that pearlite adds micro martensite, sees figure
4.After shortening soaking time at such a temperature, perlitic transformation is incomplete, also micro martensitic structure.
Comparative example 2：
Compared with embodiment 1, rail enters heat-treatment lines temperature >=680 DEG C, is then cooled down with 10 DEG C/S speed batch (-type),
Chilling temperature is reduced to 560 DEG C and 520 DEG C by 600 DEG C, air cooling is to room temperature after being incubated 90S respectively.Its histological test knot
Fruit is respectively that fine pearlite adds martensite, is shown after further reducing chilling temperature, stabilization of austenite enhancing, perlitic transformation
Postpone, segregation zones martensitic structure occur, see Fig. 5 and Fig. 6 respectively.
Comparative example 3：
Compared with embodiment 2, when rail is cooled to 520 DEG C with 10 DEG C/S speed batch (-type), then 600 are heated rapidly to
DEG C, soaking time shortens to after 45S air cooling to room temperature by 60S.Its histological test result is that fine pearlite adds micro martensite group
Knit, see Fig. 7.
Comparative example 4：
Compared with embodiment 2, rail enters heat-treatment lines temperature >=680 DEG C, is then cooled down with 10 DEG C/S speed batch (-type)
To 520 DEG C, then the temperature being heated rapidly to is down to 570 DEG C and 550 DEG C by 600 DEG C, and room is as cold as soon after being incubated 60S, 90S respectively
Temperature.Its histological test result is respectively that fine pearlite adds martensite, sees (a)~(d) in Fig. 8 respectively.In Fig. 7,
A) fine pearlite adds micro martensite, reheats 570 DEG C of insulation 60S；
B) fine pearlite adds micro martensite, reheats 570 DEG C of insulation 90S；
C) fine pearlite adds martensite, reheats 550 DEG C of insulation 60S；
D) fine pearlite adds a small amount of martensite, reheats 550 DEG C of insulation 90S；
Microscopic structure assay shows, after reducing relation reheating temperature, it is impossible to plays and eliminates ribbon martensitic structure
Effect.
Comparative example 5：
Compared with embodiment 3, rail enters heat-treatment lines temperature >=680 DEG C, is then distinguished with 15 DEG C/S speed batch (-type)
450 DEG C of lower temperature is as cold as, then is heated rapidly to 600 DEG C, air cooling is to room temperature after being incubated 60S.Its histological test result is thin
Pearlite adds bainite structure, sees Fig. 9.
Described 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 (5)
- A kind of 1. burning optimization on line method for being used to eliminate rail abnormal structure, it is characterised in that including：Step 1), rail enter heat-treatment lines with not less than 780~680 DEG C temperature, are cooled to 5~15 DEG C/S cooling rate multistage Not less than 600 DEG C temperature；Step 2), rail is incubated, the soaking time time is more than 60~90S；It is or cold with 5~15 DEG C/S cooling rate multistage But arrive and be higher than 470 DEG C of temperature；Step 3), rail is heated to above to 600 DEG C of temperature, insulation is no less than 60~90S, afterwards air cooling.
- 2. heat treatment method according to claim 1, it is characterised in that the speed of cooling is 5~8 in the step 1) ℃/S。
- 3. heat treatment method according to claim 1, it is characterised in that the speed of cooling is 5~10 in the step 2) ℃/S；It is cooled to 520~600 DEG C.
- 4. heat treatment method according to claim 1, it is characterised in that in the rail：C content be 0.68~ 1.05wt%, Si content are 0.50~0.90wt%, and Mn contents are 0.80~1.50wt%, and Cr contents are 0~1.00wt%.
- 5. heat treatment method according to claim 4, it is characterised in that in the rail：C content be 0.8~ 1.05wt%；Mn contents are 1.2~1.5wt%, and Cr contents are 0.8~1.00wt%, or Mn and Cr total contents are not less than 2.5wt%；RE content is 0.00020wt%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108411089A (en) * | 2018-03-20 | 2018-08-17 | 包头钢铁（集团）有限责任公司 | A kind of production method of European standard R350HT burning optimization on line rail |
| CN108504923A (en) * | 2018-03-20 | 2018-09-07 | 包头钢铁（集团）有限责任公司 | Hundred meters of scale 75kg/m burning optimization on line rail of one kind and its production method |
| CN108504838A (en) * | 2018-03-20 | 2018-09-07 | 包头钢铁（集团）有限责任公司 | A kind of production method of European standard R350LHT burning optimization on line rail |
| CN109402520A (en) * | 2018-11-02 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | One kind is containing low temperature resistant wear-resisting heat-treated rail of rare earth and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108411089A (en) * | 2018-03-20 | 2018-08-17 | 包头钢铁（集团）有限责任公司 | A kind of production method of European standard R350HT burning optimization on line rail |
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| CN109402520A (en) * | 2018-11-02 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | One kind is containing low temperature resistant wear-resisting heat-treated rail of rare earth and preparation method thereof |
| CN109402520B (en) * | 2018-11-02 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Rare earth-containing low-temperature-resistant wear-resistant heat-treated steel rail and preparation method thereof |
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Application publication date: 20180109 |