CN107236846A - The heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings - Google Patents
The heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings Download PDFInfo
- Publication number
- CN107236846A CN107236846A CN201710601127.2A CN201710601127A CN107236846A CN 107236846 A CN107236846 A CN 107236846A CN 201710601127 A CN201710601127 A CN 201710601127A CN 107236846 A CN107236846 A CN 107236846A
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- China
- Prior art keywords
- rail
- heat treatment
- treatment method
- properties
- r350lht
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000010791 quenching Methods 0.000 title claims abstract description 30
- 230000000171 quenching effect Effects 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 239000002826 coolant Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 7
- 229910001562 pearlite Inorganic materials 0.000 abstract description 6
- 230000002411 adverse Effects 0.000 abstract description 4
- 229910001566 austenite Inorganic materials 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 4
- 229910001563 bainite Inorganic materials 0.000 abstract description 3
- 229910000734 martensite Inorganic materials 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract description 2
- 238000004781 supercooling Methods 0.000 abstract description 2
- 235000019362 perlite Nutrition 0.000 abstract 1
- 239000010451 perlite Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings, it includes quenching process and cooling procedure, the quenching process：The rail temperature for entering quenching line is 710~750 DEG C, and soaking temperature is 710~750 DEG C；The cooling procedure：The rail is first cooled to 600~630 DEG C of rail head skin temperature with 3.0~3.5 DEG C/s speed, then is cooled to 500~550 DEG C of rail head skin temperature, last air cooling with 1.5~2.5 DEG C/s speed.This heat treatment method can speed up austenite from being transformed into perlite process, improve austenite transformation degree of supercooling, perlitic transformation is carried out at lower temperatures to obtain the smart Fine pearlite that obdurability has both, but occur without the adverse tissues such as martensite, bainite.This method makes rail tread hardness stabilization in 370HBW~390HBW by cooling system control, and occurs without adverse tissue, rail is had excellent abrasion resistance properties and contacting fatigue resistance.
Description
Technical field
The present invention relates to a kind of heat treatment method, especially a kind of heat treatment of Properties of Heavy Rail Steel R350LHT total length immediate quenchings
Method.
Background technology
The big problem that railway especially heavy haul railway faces is exactly abrasion abrasion, with the China railways speed of service, axle
Weight, the raising of density, especially rail defects and failures aggravation, the side grinding of sharp curve rail and stripping chip off-falling become increasingly conspicuous.Commonly
Hot rolled rail on curve in smaller part through using, and what is had even just changes lower road in 3~5 months because side grinding transfinites.In recent years, rail
Stripping chip off-falling situation it is also increasingly serious, lower stock ripple mill situation also happens occasionally.The abrasion serious wear influence vehicle peace of rail
Complete and comfortableness, adds railway maintenance cost.For reasonable employment rail, increase the service life, reduce railway maintenance maintenance
Workload, improves the synthesis utilization benefit of rail, it is necessary to improve the intensity and toughness of rail, reduces rail wear abrasion.
Full length rail press quenching is to improve one of rail strength, main path of toughness.It facts have proved, on bend
Using quenched rail than general rail more than one times of life-span of extension.To pearlite steel rail：Often increase 60HB, more than one times can be extended
Anti-wear performance；30HB is further added by, more than one times of anti-wear performance can be extended again.According to《Rail standard criterion》Carry out rail material
The selection of matter and strength grade, curve must select wear resistant rail, including online heat-treated rail or bainite rail.Use height
Hardness rail is to reduce the most effective and minimum cost technical measures of abrasion, therefore lifts rail hardness by being heat-treated and have
Very real meaning.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of Properties of Heavy Rail Steel R350LHT that can effectively improve rail wearability is complete
The heat treatment method of long immediate quenching.
In order to solve the above technical problems, the technical solution used in the present invention is：It includes quenching process and cooling procedure,
The quenching process：The rail temperature for entering quenching line is 710~750 DEG C, and soaking temperature is 710~750 DEG C；
The cooling procedure：The rail is first cooled to 600~630 DEG C of rail head skin temperature with 3.0~3.5 DEG C/s speed,
500~550 DEG C of rail head skin temperature, last air cooling are cooled to 1.5~2.5 DEG C/s speed again.
In cooling procedure of the present invention, in the rail head top surface of rail and rail head two sides injection cooling medium.It is described cold
But medium is water.
In quenching process of the present invention, rail carries out soaking by sensing heater.
It is using the beneficial effect produced by above-mentioned technical proposal：The heat treatment method of the present invention can speed up austenite
To the transition process of pearlite, austenite transformation degree of supercooling is improved, makes perlitic transformation carry out at lower temperatures to obtain
The smart Fine pearlite that obdurability has both, but occur without the adverse tissues such as martensite, bainite.The present invention passes through cooling
System control, makes rail tread hardness stabilization in 370HBW~390HBW, and occurs without adverse tissue, has rail excellent
Abrasion resistance properties and contacting fatigue resistance.The present invention does not increase cost additionally, using the cooling capacity of water, fully refines steel
Medium pearlite tissue, so as to obtain higher strong hardness index and the matching of good obdurability, has rail excellent wear-resistant
Performance and contacting fatigue resistance, with very high economic value.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the quenching structure figure at the product rail head tread of the embodiment of the present invention 1（20μm）；
Fig. 2 is the quenching structure figure at the product rail head center portion of the embodiment of the present invention 1（20μm）.
Embodiment
The heat treatment method of this Properties of Heavy Rail Steel R350LHT total length immediate quenchings includes quenching process and cooling procedure, technique mistake
Journey is as described below：（1）The quenching process：The rail after finish to gauge is stood on roller-way using double steel stand, rail enters sense
Answer before heater and to be stopped in roller-way, at once with 0.5~0.7m/s speed by sensing heater after stay-warm case covering, entered
Row soaking is to reduce head and tail temperature difference；The rail temperature that rail enters quenching line is 710~750 DEG C, the soaking temperature of sensing heater
For 710~750 DEG C.
（2）The cooling procedure：Cooling procedure is divided into two benches；First stage is with very fast cooling velocity by the rail head of rail
Skin temperature is down to 600~630 DEG C, and cooling velocity is 3.0~3.5 DEG C/s；Then second stage makes rail in slower cooling speed
Degree is lower to be cooled down, and the rail head skin temperature of rail is down to 500~550 DEG C, cooling velocity is 1.5~2.5 DEG C/s；Finally
Rail is set to continue cooling in atmosphere.Cooling procedure is applied using some groups of shower nozzles to the rail head top surface of rail and rail head two sides
Cooling medium, cooling medium is single water cooling, not including compressed air or water smoke mixed air.
Embodiment 1-8：The heat treatment method of this Properties of Heavy Rail Steel R350LHT total length immediate quenchings uses following concrete technologies.
（1）Each embodiment quenching process and the technological parameter of cooling procedure are shown in Table 1.
Table 1：The technological parameter of each embodiment
（2）Tread hardness determination is carried out to above-mentioned 8 embodiments according to TB/T2344-2012 standards, testing result is shown in Table 2.
Table 2：The tread hardness of each embodiment rail
The quenching structure that Fig. 1 and Fig. 2 are respectively at the product rail head tread of embodiment 1 and rail head center portion is obtained, can be seen by Fig. 1,2
Go out, it is organized as smart Fine pearlite.As can be seen from Table 2, the product obtained by this heat treatment method, meets mark
Alignment request, it is functional；While the good tensile strength of acquisition and elongation percentage, with excellent hardness performance, so as to carry
High rail wear resistance.
Claims (4)
1. a kind of heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings, it includes quenching process and cooling procedure, and it is special
Levy and be, the quenching process：The rail temperature for entering quenching line is 710~750 DEG C, and soaking temperature is 710~750 DEG C；
The cooling procedure：The rail is first cooled to 600~630 DEG C of rail head skin temperature with 3.0~3.5 DEG C/s speed,
500~550 DEG C of rail head skin temperature, last air cooling are cooled to 1.5~2.5 DEG C/s speed again.
2. the heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings according to claim 1, it is characterised in that：Institute
State in cooling procedure, in the rail head top surface of rail and rail head two sides injection cooling medium.
3. the heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings according to claim 2, it is characterised in that：Institute
Cooling medium is stated for water.
4. the heat treatment method of the Properties of Heavy Rail Steel R350LHT total length immediate quenchings according to claim 1,2 or 3, its feature exists
In：In the quenching process, rail carries out soaking by sensing heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710601127.2A CN107236846A (en) | 2017-07-21 | 2017-07-21 | The heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710601127.2A CN107236846A (en) | 2017-07-21 | 2017-07-21 | The heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107236846A true CN107236846A (en) | 2017-10-10 |
Family
ID=59989272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710601127.2A Withdrawn CN107236846A (en) | 2017-07-21 | 2017-07-21 | The heat treatment method of Properties of Heavy Rail Steel R350LHT total length immediate quenchings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107236846A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852782A (en) * | 2019-01-09 | 2019-06-07 | 邯郸钢铁集团有限责任公司 | The method for eliminating R350LHT heat-treatment of rail blackspot |
| CN112176170A (en) * | 2020-10-09 | 2021-01-05 | 邯郸钢铁集团有限责任公司 | Heat treatment method for full-length waste heat quenching of heavy rail steel |
| CN112708748A (en) * | 2020-11-12 | 2021-04-27 | 邯郸钢铁集团有限责任公司 | Method for improving temperature uniformity of head and tail of heat-treated steel rail |
| CN117535500A (en) * | 2023-11-28 | 2024-02-09 | 包头钢铁（集团）有限责任公司 | A method to improve rail heat treatment efficiency |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102985574A (en) * | 2010-06-07 | 2013-03-20 | 新日铁住金株式会社 | Steel rail and production method thereof |
| CN104046765A (en) * | 2014-02-20 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Hypereutectoid steel rail heat treatment method |
| CN105238917A (en) * | 2015-11-06 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving low-temperature fracture toughness of steel rail and obtained steel rail and application thereof |
| CN106661651A (en) * | 2014-08-20 | 2017-05-10 | 杰富意钢铁株式会社 | Heat treatment rail manufacturing method and manufacturing apparatus |
-
2017
- 2017-07-21 CN CN201710601127.2A patent/CN107236846A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102985574A (en) * | 2010-06-07 | 2013-03-20 | 新日铁住金株式会社 | Steel rail and production method thereof |
| CN104046765A (en) * | 2014-02-20 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Hypereutectoid steel rail heat treatment method |
| CN106661651A (en) * | 2014-08-20 | 2017-05-10 | 杰富意钢铁株式会社 | Heat treatment rail manufacturing method and manufacturing apparatus |
| CN105238917A (en) * | 2015-11-06 | 2016-01-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving low-temperature fracture toughness of steel rail and obtained steel rail and application thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109852782A (en) * | 2019-01-09 | 2019-06-07 | 邯郸钢铁集团有限责任公司 | The method for eliminating R350LHT heat-treatment of rail blackspot |
| CN109852782B (en) * | 2019-01-09 | 2020-06-16 | 邯郸钢铁集团有限责任公司 | Method for eliminating R350LHT steel rail heat treatment black spot |
| CN112176170A (en) * | 2020-10-09 | 2021-01-05 | 邯郸钢铁集团有限责任公司 | Heat treatment method for full-length waste heat quenching of heavy rail steel |
| CN112708748A (en) * | 2020-11-12 | 2021-04-27 | 邯郸钢铁集团有限责任公司 | Method for improving temperature uniformity of head and tail of heat-treated steel rail |
| CN117535500A (en) * | 2023-11-28 | 2024-02-09 | 包头钢铁（集团）有限责任公司 | A method to improve rail heat treatment efficiency |
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Application publication date: 20171010 |
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