CN107541596B - 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
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- CN107541596B CN107541596B CN201710747477.XA CN201710747477A CN107541596B CN 107541596 B CN107541596 B CN 107541596B CN 201710747477 A CN201710747477 A CN 201710747477A CN 107541596 B CN107541596 B CN 107541596B
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Abstract
The invention discloses a kind of burning optimization on line techniques of U75V rail, are related to heat-treatment of rail technical field, include the following steps: that first mid-frequency induction heating to 1120-1150 DEG C, and keeps the temperature 10-12 minutes；Hardening heat is cooled to it, i.e., at 850-870 DEG C, compressed air cooling quenchings is carried out to the top surface of rail and two sides using air cooling equipment, control cooling velocity is 3-4 DEG C/s；455-460 DEG C of cooled to room temperature is down to rail temperature；The present invention is improved by above-mentioned technique, the hardness of Rail Surface, and tensile strength, elongation percentage are all greatly improved.
Description
Technical field
The present invention relates to heat-treatment of rail technical fields, and in particular to a kind of burning optimization on line technique of U75V rail.
Background technique
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, to the intensity, hardness and anti-fatigue performance of rail, more stringent requirements are proposed.The practice of countries in the world railway is
Shown that 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, select the other heat-treated rail of different intensity scale.But existing heat treatment process is there is also deficiency, rail
There is improved space in case depth, wearability and hardness.
Chinese Patent Application No. is that CN201510909978.4 discloses a kind of heat treatment process of pearlite steel rail hardening,
Rail is heated to 880-920 DEG C by the heat treatment of pearlite steel rail hardening, keeps the temperature 10-15 minutes, according to steel grade difference, with specific
Cooling rate range be as cold as specific temperature range heat preservation 30s, then it is air-cooled, specifically: the pearlite steel rail that material is U75V hardens
Process system are as follows: 880-920 DEG C heat preservation 10-15 minutes, be cooled to 570-600 DEG C with 8-15 DEG C/s cooling rate, then with 0.2-0.5
DEG C/air-cooled to 20-25 DEG C of cooling rate of s.Its advantage is that: the specific hardening heat treatment process of a certain special component rail of specification, behaviour
The property made is strong, realizes the best match of hardening heat treatment process and rail ingredient, realizes the hardening effect of rail.But its this kind of heat
The thickness of the rail that treatment process is produced, pearlitic structrure is still larger, interlamellar spacing be also in this way, intensity and Roughness Parameter not
It is high.
Summary of the invention
The problem to be solved by the invention is to provide a kind of online heat of the U75V rail of excellent in mechanical performance, simple process
Treatment process.
To achieve the goals above, the technical scheme adopted by the invention is as follows: a kind of provided online heat of U75V rail
Treatment process, including following processing steps:
(1) by the surface of U75V rail through mid-frequency induction heating to 1120-1150 DEG C, and keep the temperature 10-12 minutes, intermediate frequency sense
The power frequency that should be heated is 1.5-2.0kHz；
(2) it when the rail after heating in step (1) is cooled to 850-870 DEG C, is passed in burning optimization on line device,
Compressed air cooling is carried out to the top surface of rail and two sides using air cooling equipment, is quenched to 635-645 DEG C, control cooling velocity is
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) by after quenched rail temperature is down to 455-460 DEG C in step (2), cooled to room temperature.
Preferably, the both ends of rail are fixed by railway clamping device in the step (2).
Preferably, the railway clamping device includes two pieces of symmetrically arranged clamping plates, the inside of the clamping plate and rail
Bottom shape matches, and clamping plate is equipped with mounting hole.
Preferably, heating 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 optimization heating in medium frequency temperature to 1120-1150 DEG C, and a period of time is kept the temperature, made
The quick austenitizing of rail, be cooled to hardening heat to it, i.e., at 850-870 DEG C, then again by the way of compressed air cooling,
It is cooled to 635-645 DEG C with the speed of 3-4 DEG C/s, 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 the distance of strict control nozzle, air
Degree and nozzle exit pressure, enable cooling velocity to be strictly controlled, spacing between the pearlite of shred layer in cooling procedure
It has obtained being decreased to 110nm or less and be evenly distributed, the hardness of Rail Surface improves, and reaches HB370 or more, tensile strength reaches
1310MPa or more, elongation percentage have been increased to 11% or more, and impact flexibility has been increased to 29J/cm2.Finally by rail inside
Tissue is refined and removes thermal stress.
Detailed description of the invention
Fig. 1 is rail and the cross-sectional view after railway clamping device assembly in the present invention.
Fig. 2 is the metallographic structure figure of the hardened layer section of embodiment 1-3 in the present invention.
Specific embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment and attached drawing 1,2, the invention will be further described,
The embodiment is only 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 mid-frequency induction heating to 1120 DEG C, and keep the temperature 12 minutes, mid-frequency induction heating
Power frequency is 1.5kHz；
(2) it when the rail after heating in step (1) is cooled to 850 DEG C, 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, control cooling velocity is 3 DEG C/s, 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) by after quenched rail temperature is down to 455 DEG C in step (2), cooled to room temperature.
In the present embodiment, the both ends of rail are fixed by railway clamping device in the step (2), the railway clamping
Device includes two pieces of symmetrically arranged clamping plates, and the inside of the clamping plate is matched with the bottom shape of rail, and clamping plate is equipped 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 mid-frequency induction heating to 1132 DEG C, and keep the temperature 11 minutes, mid-frequency induction heating
Power frequency is 1.8kHz；
(2) it when the rail after heating in step (1) is cooled to 862 DEG C, 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 control cooling velocity is 3.5 DEG C/s,
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) by after quenched rail temperature is down to 458 DEG C in step (2), cooled to room temperature.
In the present embodiment, the both ends of rail are fixed by railway clamping device in the step (2), the railway clamping
Device includes two pieces of symmetrically arranged clamping plates, and the inside of the clamping plate is matched with the bottom shape of rail, and clamping plate is equipped 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 mid-frequency induction heating to 1150 DEG C, and keep the temperature 10 minutes, mid-frequency induction heating
Power frequency is 2.0kHz；
(2) it when the rail after heating in step (1) is cooled to 870 DEG C, 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, control cooling velocity is 3 DEG C/s, 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) by after quenched rail temperature is down to 460 DEG C in step (2), cooled to room temperature.
In the present embodiment, the both ends of rail are fixed by railway clamping device in the step (2), the railway clamping
Device includes two pieces of symmetrically arranged clamping plates, and the inside of the clamping plate is matched with the bottom shape of rail, and clamping plate is equipped 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 using method concept and skill of the invention
The improvement for the various unsubstantialities that art scheme carries out, or not improved the conception and technical scheme of the invention are directly applied to it
Its occasion, it is within the scope of the present invention.
Claims (1)
1. a kind of burning optimization on line technique of U75V rail, which is characterized in that including following processing steps:
(1) by the surface of U75V rail through mid-frequency induction heating to 1132 DEG C, and keep the temperature 10-12 minutes, mid-frequency induction heating
Power frequency is 1.5-2.0kHz；
(2) it when the rail after heating in step (1) is cooled to 850-870 DEG C, 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 control cooling velocity is 3.5 DEG C/s, nozzle and rail it
Between distance be 18mm, nozzle spray air initial velocity be 4.5-4.8m/s, nozzle exit pressure 0.27MPa, rail
Both ends are fixed by railway clamping device, the railway clamping device include two pieces of symmetrically arranged clamping plates, the clamping plate it is interior
Side is matched with the bottom shape of rail, and clamping plate is equipped with mounting hole, and the airflow direction that nozzle sprays is vertical with Rail Surface；
(3) after quenched rail temperature is down to 458 DEG C in step (2), cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710747477.XA CN107541596B (en) | 2017-08-28 | 2017-08-28 | A kind of burning optimization on line technique of U75V rail |
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| CN201710747477.XA CN107541596B (en) | 2017-08-28 | 2017-08-28 | A kind of burning optimization on line technique of U75V rail |
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| CN107541596B true CN107541596B (en) | 2018-12-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN115029534B (en) * | 2022-06-24 | 2023-07-21 | 中国航发北京航空材料研究院 | Solid solution cooling device and method for variable-section nickel-based superalloy shaft component |
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