CN107541596A - A kind of burning optimization on line technique of U75V rail - Google Patents
A kind of burning optimization on line technique of U75V rail Download PDFInfo
- Publication number
- CN107541596A CN107541596A CN201710747477.XA CN201710747477A CN107541596A CN 107541596 A CN107541596 A CN 107541596A CN 201710747477 A CN201710747477 A CN 201710747477A CN 107541596 A CN107541596 A CN 107541596A
- Authority
- CN
- China
- Prior art keywords
- rail
- burning optimization
- line technique
- nozzle
- temperature
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of burning optimization on line technique of U75V rail, it is related to heat-treatment of rail technical field, comprises the following steps：First Frequency Induction Heating is incubated 10 12 minutes to 1,120 1150 DEG C；Treat that it is cooled to hardening heat, i.e., at 850 870 DEG C, compressed air cooling quenchings are carried out to the top surface of rail and two sides using air cooling equipment, it is 34 DEG C/s to control cooling velocity；Treat that rail temperature is down to 455 460 DEG C and naturally cools to room temperature；The present invention is improved by above-mentioned technique, the hardness of Rail Surface, and tensile strength, elongation percentage, which are obtained for, to be greatly improved.
Description
Technical field
The present invention relates to heat-treatment of rail technical field, and in particular to a kind of burning optimization on line technique of U75V rail.
Background technology
With the development of China Railway cause, train pull weight, the speed of service, traffic density and year pass through total amount
Step up, considerably increase the load of rail, increase the hurt of rail, especially curved steel rail.In order to improve rail
Service life, higher requirement is proposed to the intensity, hardness and anti-fatigue performance of rail.The practice of countries in the world railway is
Through showing, heat-treatment of rail is most effective, the most economical measure for improving steel rail material obdurability.China is also required according to difference
Line condition, from the other heat-treated rail of different intensity scale.But existing Technology for Heating Processing also Shortcomings, rail
Improved space be present in case depth, wearability and hardness.
Chinese Patent Application No. is that CN201510909978.4 discloses a kind of Technology for Heating Processing of pearlite steel rail hardening,
Rail is heated to 880-920 DEG C by the heat treatment of pearlite steel rail hardening, is incubated 10-15 minutes, different according to steel grade, with specific
Cooling rate scope be as cold as specific temperature range insulation 30s, then air cooling, be specially：The pearlite steel rail that material is U75V hardens
Process system is：880-920 DEG C of insulation 10-15 minute, 570-600 DEG C is cooled to 8-15 DEG C/s cooling rates, then with 0.2-0.5
DEG C/s cooling rate air cooling is to 20-25 DEG C.Its advantage is：The specific hardening Technology for Heating Processing of a certain special component rail of specification, behaviour
The property made is strong, realizes the best match of hardening Technology for Heating Processing and rail composition, realizes the hardening effect of rail.But its this kind of heat
The rail that handling process is produced, the thickness of pearlitic structrure is still larger, interlamellar spacing be also in this way, intensity and Roughness Parameter not
It is high.
The content of the invention
Problem to be solved by this invention is to provide a kind of online heat of the simple U75V rail of excellent in mechanical performance, technique
Handling process.
To achieve these goals, the technical scheme taken of the present invention is：A kind of online heat of the U75V rail provided
Handling process, including following processing steps：
(1) by the surface of U75V rail through Frequency Induction Heating to 1120-1150 DEG C, and be incubated 10-12 minutes, intermediate frequency sense
The power frequency that should be heated is 1.5-2.0kHz；
(2) when the rail after being heated in step (1) is cooled to 850-870 DEG C, it is passed in burning optimization on line device,
Compressed air coolings are carried out to the top surface of rail and two sides using air cooling equipment, are quenched to 635-645 DEG C, control the cooling velocity to be
3-4 DEG C/s, the distance between nozzle and rail are 16-18mm, and the initial velocity for the air that nozzle sprays is 4.5-4.8m/s, spray
Mouth pressure is 0.25-0.27MPa；
(3) after the rail temperature after being quenched in step (2) being down into 455-460 DEG C, room temperature is naturally cooled to.
Preferably, two of rail is fixed by railway clamping device in the step (2).
Preferably, the railway clamping device includes two pieces of symmetrically arranged clamping plates, the inner side of the clamping plate and rail
Bottom shape is engaged, and clamping plate is provided with mounting hole.
Preferably, heating-up temperature is specially 1132 DEG C in the step (1).
Preferably, cooling velocity is specially 3.5 DEG C/s in the step (2), and the distance between nozzle and rail are 18mm,
Nozzle exit pressure is 0.27MPa.
Preferably, the temperature in the step (3) is specially 458 DEG C.
Preferably, the airflow direction that nozzle sprays in the step (2) is vertical with Rail Surface.
Beneficial effects of the present invention：By optimizing heating in medium frequency temperature to 1120-1150 DEG C, and a period of time is incubated, made
The quick austenitizing of rail, treat that it is cooled to hardening heat, i.e., at 850-870 DEG C, then again by the way of compressed air cooling,
635-645 DEG C is cooled to 3-4 DEG C/s speed, overcooling austenite is elongated in the residence time of fine pearlite transition region, and
The formation of the pearlitic structrure of shred layer can be effectively facilitated, the present invention is initially fast by strictly controlling the distance of nozzle, air
Degree and nozzle exit pressure so that cooling velocity can be strictly controlled, spacing between the pearlite of shred layer in cooling procedure
Obtain being decreased to below 110nm and be evenly distributed, the hardness of Rail Surface improves, and reaches more than HB370, tensile strength reaches
More than 1310MPa, elongation percentage have brought up to more than 11%, and impact flexibility has brought up to 29J/cm2.Finally by rail inside
Tissue is refined and removes thermal stress.
Brief description of the drawings
Fig. 1 is rail and the cross-sectional view after railway clamping device assembling in the present invention.
Fig. 2 is the metallographic structure figure of embodiment 1-3 hardened layer section in the present invention.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing 1,2, the invention will be further described,
The embodiment is only used for explaining the present invention, is not intended to limit the scope of the present invention..
Embodiment 1
A kind of burning optimization on line technique of U75V rail, including following processing steps：
(1) by the surface of U75V rail through Frequency Induction Heating to 1120 DEG C, and be incubated 12 minutes, Frequency Induction Heating
Power frequency is 1.5kHz；
(2) when the rail after being heated in step (1) is cooled to 850 DEG C, it is passed in burning optimization on line device, utilizes
Air cooling equipment carries out compressed air cooling to the top surface of rail and two sides, is quenched to 635 DEG C, and it is 3 DEG C/s to control cooling velocity, spray
The distance between mouth and rail are 18mm, and the initial velocity for the air that nozzle sprays is 4.8m/s, nozzle exit pressure 0.27MPa；
(3) after the rail temperature after being quenched in step (2) being down into 455 DEG C, room temperature is naturally cooled to.
In the present embodiment, two of rail is fixed by railway clamping device in the step (2), the railway clamping
Device includes two pieces of symmetrically arranged clamping plates, and the inner side of the clamping plate is engaged with the bottom shape of rail, and clamping plate is provided with peace
Hole is filled, in quenching, the quenching distortion of rail can be reduced by the railway clamping device at both ends.
Embodiment 2
A kind of burning optimization on line technique of U75V rail, including following processing steps：
(1) by the surface of U75V rail through Frequency Induction Heating to 1132 DEG C, and be incubated 11 minutes, Frequency Induction Heating
Power frequency is 1.8kHz；
(2) when the rail after being heated in step (1) is cooled to 862 DEG C, it is passed in burning optimization on line device, utilizes
Air cooling equipment carries out compressed air cooling to the top surface of rail and two sides, is quenched to 640 DEG C, and it is 3.5 DEG C/s to control cooling velocity,
The distance between nozzle and rail are 18mm, and the initial velocity for the air that nozzle sprays is 4.7m/s, and nozzle exit pressure is
0.27MPa；
(3) after the rail temperature after being quenched in step (2) being down into 458 DEG C, room temperature is naturally cooled to.
In the present embodiment, two of rail is fixed by railway clamping device in the step (2), the railway clamping
Device includes two pieces of symmetrically arranged clamping plates, and the inner side of the clamping plate is engaged with the bottom shape of rail, and clamping plate is provided with peace
Hole is filled, in quenching, the quenching distortion of rail can be reduced by the railway clamping device at both ends.
Embodiment 3
A kind of burning optimization on line technique of U75V rail, including following processing steps：
(1) by the surface of U75V rail through Frequency Induction Heating to 1150 DEG C, and be incubated 10 minutes, Frequency Induction Heating
Power frequency is 2.0kHz；
(2) when the rail after being heated in step (1) is cooled to 870 DEG C, it is passed in burning optimization on line device, utilizes
Air cooling equipment carries out compressed air cooling to the top surface of rail and two sides, is quenched to 645 DEG C, and it is 3 DEG C/s to control cooling velocity, spray
The distance between mouth and rail are 16mm, and the initial velocity for the air that nozzle sprays is 4.5m/s, nozzle exit pressure 0.25MPa；
(3) after the rail temperature after being quenched in step (2) being down into 460 DEG C, room temperature is naturally cooled to.
In the present embodiment, two of rail is fixed by railway clamping device in the step (2), the railway clamping
Device includes two pieces of symmetrically arranged clamping plates, and the inner side of the clamping plate is engaged with the bottom shape of rail, and clamping plate is provided with peace
Hole is filled, in quenching, the quenching distortion of rail can be reduced by the railway clamping device at both ends.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as employing the methodology and skill of the present invention
Art scheme carry out various unsubstantialities improvement, or it is not improved by the present invention design and technical scheme directly apply to it
Its occasion, within protection scope of the present invention.
Claims (7)
1. a kind of burning optimization on line technique of U75V rail, it is characterised in that including following processing steps：
(1) by the surface of U75V rail through Frequency Induction Heating to 1120-1150 DEG C, and be incubated 10-12 minutes, Medium frequency induction adds
The power frequency of heat is 1.5-2.0kHz；
(2) when the rail after being heated in step (1) is cooled to 850-870 DEG C, it is passed in burning optimization on line device, utilizes
Air cooling equipment carries out compressed air coolings to the top surface of rail and two sides, and it is 3-4 DEG C/s control cooling velocity, nozzle and rail it
Between distance be 16-18mm, the initial velocity for the air that nozzle sprays is 4.5-4.8m/s, nozzle exit pressure 0.25-
0.27MPa；
(3) after the rail temperature after being quenched in step (2) is down to 455-460 DEG C, room temperature is naturally cooled to.
A kind of 2. burning optimization on line technique of U75V rail according to claim 1, it is characterised in that：The step (2)
Two of middle rail is fixed by railway clamping device.
A kind of 3. burning optimization on line technique of U75V rail according to claim 2, it is characterised in that：The railway clamping
Device includes two pieces of symmetrically arranged clamping plates, and the inner side of the clamping plate is engaged with the bottom shape of rail, and clamping plate is provided with peace
Fill hole.
A kind of 4. burning optimization on line technique of U75V rail according to claim 1, it is characterised in that：The step (1)
Middle heating-up temperature is specially 1132 DEG C.
A kind of 5. burning optimization on line technique of U75V rail according to claim 1, it is characterised in that：The step (2)
Middle cooling velocity is specially 3.5 DEG C/s, and the distance between nozzle and rail are 18mm, nozzle exit pressure 0.27MPa.
A kind of 6. burning optimization on line technique of U75V rail according to claim 1, it is characterised in that：The step (3)
In temperature be specially 458 DEG C.
A kind of 7. burning optimization on line technique of U75V rail according to claim 1, it is characterised in that：The step (2)
The airflow direction that middle nozzle sprays is vertical with Rail Surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710747477.XA CN107541596B (en) | 2017-08-28 | 2017-08-28 | A kind of burning optimization on line technique of U75V rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710747477.XA CN107541596B (en) | 2017-08-28 | 2017-08-28 | A kind of burning optimization on line technique of U75V rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107541596A true CN107541596A (en) | 2018-01-05 |
| CN107541596B CN107541596B (en) | 2018-12-25 |
Family
ID=60957855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710747477.XA Active CN107541596B (en) | 2017-08-28 | 2017-08-28 | A kind of burning optimization on line technique of U75V rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107541596B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN115029534A (en) * | 2022-06-24 | 2022-09-09 | 中国航发北京航空材料研究院 | Solid solution cooling device and method for variable-section nickel-based high-temperature alloy shaft part |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03274221A (en) * | 1990-03-23 | 1991-12-05 | Fuji Denshi Kogyo Kk | Method and apparatus for high-frequency shifting quenching and tempering |
| CN1075985A (en) * | 1992-11-26 | 1993-09-08 | 冶金工业部重庆钢铁设计研究院 | Heat treatment method for steel rail and device |
| CN102643971A (en) * | 2012-04-12 | 2012-08-22 | 东北大学 | Online thermal treatment device for heavy rail |
| CN102776336A (en) * | 2012-08-09 | 2012-11-14 | 株洲敏锐机车配件有限责任公司 | Quenching process method and device for achieving same |
| CN202730186U (en) * | 2012-08-09 | 2013-02-13 | 株洲敏锐机车配件有限责任公司 | Quenching device |
| CN103131826A (en) * | 2013-02-26 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Steel rail on-line wind-jet quenching heat treatment simulation experiment device |
| CN103981353A (en) * | 2014-05-15 | 2014-08-13 | 宝鸡中铁宝桥天元实业发展有限公司 | Double-station heat treatment method of steel rail head and double-station medium-frequency induction hardening device of steel rail |
| CN106086622A (en) * | 2016-06-24 | 2016-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The heat treatment production method of a kind of passenger-cargo mixed fortune Rail for railway and gained rail |
| CN106498143A (en) * | 2016-10-20 | 2017-03-15 | 武汉钢铁股份有限公司 | A kind of burning optimization on line method and burning optimization on line system for rail |
-
2017
- 2017-08-28 CN CN201710747477.XA patent/CN107541596B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03274221A (en) * | 1990-03-23 | 1991-12-05 | Fuji Denshi Kogyo Kk | Method and apparatus for high-frequency shifting quenching and tempering |
| CN1075985A (en) * | 1992-11-26 | 1993-09-08 | 冶金工业部重庆钢铁设计研究院 | Heat treatment method for steel rail and device |
| CN102643971A (en) * | 2012-04-12 | 2012-08-22 | 东北大学 | Online thermal treatment device for heavy rail |
| CN102776336A (en) * | 2012-08-09 | 2012-11-14 | 株洲敏锐机车配件有限责任公司 | Quenching process method and device for achieving same |
| CN202730186U (en) * | 2012-08-09 | 2013-02-13 | 株洲敏锐机车配件有限责任公司 | Quenching device |
| CN103131826A (en) * | 2013-02-26 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Steel rail on-line wind-jet quenching heat treatment simulation experiment device |
| CN103981353A (en) * | 2014-05-15 | 2014-08-13 | 宝鸡中铁宝桥天元实业发展有限公司 | Double-station heat treatment method of steel rail head and double-station medium-frequency induction hardening device of steel rail |
| CN106086622A (en) * | 2016-06-24 | 2016-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The heat treatment production method of a kind of passenger-cargo mixed fortune Rail for railway and gained rail |
| CN106498143A (en) * | 2016-10-20 | 2017-03-15 | 武汉钢铁股份有限公司 | A kind of burning optimization on line method and burning optimization on line system for rail |
Non-Patent Citations (1)
| Title |
|---|
| 王立新等: "U75V钢相变动力学曲线测定及热处理工艺研究", 《包钢科技》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN115029534A (en) * | 2022-06-24 | 2022-09-09 | 中国航发北京航空材料研究院 | Solid solution cooling device and method for variable-section nickel-based high-temperature alloy shaft part |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107541596B (en) | 2018-12-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107541596B (en) | A kind of burning optimization on line technique of U75V rail | |
| CN105648170B (en) | The control method and bearing steel of bearing steel net carbide and Cold Roll | |
| CN103243275B (en) | Preparation method of bainite/martensite/austenite composite high-strength steel | |
| CN103045935A (en) | Control method for surface decarburization and ferrite distribution of steel disc bar of spring | |
| CN104451408B (en) | Strong bainitic steel of carbon superelevation and preparation method thereof in one | |
| CN109694988A (en) | Steel for third-generation pressurized water reactor nuclear power station support hanger and manufacturing method thereof | |
| CN105483347A (en) | Heat treatment technology for pearlite steel rail hardening | |
| CN102041371A (en) | Heat treatment method of high-tenacity high-strength steel plate | |
| CN105238911A (en) | Steel grain refining heat treatment method for heavy-load locomotive gear | |
| CN103820705B (en) | The nuclear power container property heat treatment method of SA508-3 heavy froging | |
| CN103820610B (en) | Improve the property heat treatment method of nuclear power container heavy froging obdurability | |
| CN105695858B (en) | Railroad frog high-carbon ultra high silicon bainitic steel and preparation method thereof | |
| CN107828957A (en) | A kind of Technology for Heating Processing of the carburizing steel gear forgingses of 18C,rNi,Mo7 6 | |
| CN104164548B (en) | A kind of thermal treatment process of thick and large section low-carbon low-alloy steel forge piece | |
| CN101974676A (en) | Breaking-preventing knuckle spindle and thermal treatment method thereof | |
| CN107557557A (en) | A kind of burning optimization on line method for being used to eliminate rail abnormal structure | |
| CN106636590B (en) | A kind of medium carbon steel thermo-mechanical processi method of alternative modifier treatment | |
| CN101831594A (en) | Method for manufacturing high-strength steel plate used in low-temperature environment | |
| CN109929969B (en) | Optimization method of alloy steel water quenching process | |
| CN107760833B (en) | A kind of tungstenic brake disc of high-speed train Heat-Treatment of Steel method | |
| CN105734402B (en) | Railroad frog low-carbon martensitic steels and preparation method thereof | |
| RU2632507C1 (en) | Method of heat treatment of whole-rolled railway wheels | |
| CN112210710B (en) | Low-noise steel rail for bridge crane and preparation method thereof | |
| CN105908095A (en) | High-plasticity cast steel and preparation method thereof | |
| CN1690242A (en) | Soft magnetic structural-steel-plate with excellent toughness under low temperature and method for making same |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |