CN101701284A - Heat treatment method for steel rail - Google Patents
Heat treatment method for steel rail Download PDFInfo
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- CN101701284A CN101701284A CN200910232288A CN200910232288A CN101701284A CN 101701284 A CN101701284 A CN 101701284A CN 200910232288 A CN200910232288 A CN 200910232288A CN 200910232288 A CN200910232288 A CN 200910232288A CN 101701284 A CN101701284 A CN 101701284A
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- rail
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- heat treatment
- rail head
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Abstract
The invention relates to the technical field of heat treatment of steel rails, in particular to a heat treatment method for a steel rail. The method comprises the following steps of: integrally preheating a steel rail by a power frequency induction heating device, wherein the temperature of a rail head is 450-600 DEG C, and the temperature of the rail bottom is 380-450 DEG C; heating the rail head to 800-1,000 DEG C by an intermediate frequency induction heating device; cooling the rail head to 800-600 DEG C by compressed air through an air-jetting device and then cooling in the natural environment; cooling the rail head to 700-500 DEG C by a mist spray device; and finally cooling the rail head to 430-200 DEG C by a water spray device. The steel rail is uniformly cooled by the transition of spray cooling, and the water flow is easy to control, thereby being convenient for operators and greatly improving the stability of a quenching process, the performance of products and the cooling effect.
Description
Technical field
The present invention relates to the heat treatment technics field of rail, especially a kind of heat treatment method for steel rail.
Background technology
In the prior art, the heat treating method of producing high slight rail has two kinds, a kind of is the quenching technology of " mist behind the first wind ", there is following shortcoming in this technology, the mobile influence that is subject to air and discharge of mist, this difficulty is difficult to overcome, thereby the temperature of the control rail head and the flange of rail is difficult to control, brings difficulty to the operator.Another kind is the quenching technology of " water behind the first wind ", and there is following shortcoming in this technology, and the current cooling makes the rail inhomogeneous cooling even, thereby influences the stability and the product performance of quenching technology.These two kinds of methods all can not make the thermal effectiveness of rail better.
Summary of the invention
The not good deficiency of thermal effectiveness in order to overcome existing rail the invention provides a kind of heat treatment method for steel rail.
The technical solution adopted for the present invention to solve the technical problems is: a kind of heat treatment method for steel rail, pass through the line-frequency induction heating unit earlier with the whole preheating of rail, 450～600 ℃ of rail heads, 380～450 ℃ of the flanges of rail, with intermediate frequency induction heating device rail head is heated to 800～1000 ℃ again, with air-jet device pressurized air is sprayed 800～600 ℃ of cold rail heads, it is cooled off under physical environment, make rail head be cooled to 700～500 ℃ with spraying plant again, make rail head be chilled to 430～200 ℃ with waterworks at last.
According to another embodiment of the invention, comprise that further spraying plant is between air-jet device and the waterworks, extenuates the cooling range between air-jet device and the waterworks.
According to another embodiment of the invention, further comprise air-jet device cooling after, make rail head be lower than 0～60 ℃ of the flange of rail, or rail head is higher than 0～50 ℃ of the flange of rail.
The invention has the beneficial effects as follows that the transition by spray cooling makes the rail cooling evenly, and discharge is easy to control, has made things convenient for the operator, thereby makes the stability of quenching technology and product performance improve greatly, has improved cooling performance.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation of the present invention.
1. feed rollss among the figure, 2. line-frequency induction heating unit, 3. intermediate frequency induction heating device, 4. rail, 5. air-jet device, 6. spraying plant, 7. waterworks.
Embodiment
The present invention is further detailed explanation with preferred embodiment in conjunction with the accompanying drawings now.These accompanying drawings are the synoptic diagram of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
As Fig. 1 is structural representation of the present invention, a kind of heat treatment method for steel rail, pass through line-frequency induction heating unit 2 earlier with rail 4 whole preheatings, 450～600 ℃ of rail heads, 380～450 ℃ of the flanges of rail are heated to 800～1000 ℃ with intermediate frequency induction heating device 3 with rail head again, with air-jet device 5 pressurized air is sprayed 800～600 ℃ of cold rail heads, it is cooled off under physical environment, make rail head be cooled to 700～500 ℃ with spraying plant 6 again, make rail head be chilled to 430～200 ℃ with waterworks 7 at last.Spraying plant 6 is between air-jet device 5 and the waterworks 7, extenuates the cooling range between air-jet device 5 and the waterworks 7.After air-jet device 5 coolings, make rail head be lower than 0～60 ℃ of the flange of rail, or rail head is higher than 0～50 ℃ of the flange of rail.
In heat treatment process, rail by feed rolls 1 continuously, uniaxially sends into line-frequency induction heating unit 2, this moment, rail 4 piece cover were gone into line-frequency induction heating unit 2, the preheating temperature of rail 4 is to 450～600 ℃ of rail heads, 380～450 ℃ of the flanges of rail; Only rail head is covered with intermediate frequency induction heating device 3 again, and be heated to 800～1000 ℃, with air-jet device 5 pressurized air is sprayed 800～600 ℃ of cold rail heads afterwards, air-jet device 5 is formed by being centered around rail 4 shower nozzle all around, be provided with countless nozzles in the shower nozzle, can effectively control the flow of spray wind, it is cooled off under physical environment; Make rail head be cooled to 700～500 ℃ with spraying plant 6 again and realize simple cooling transition, use waterworks 7 at last, control its flow velocity and speed of cooling, make rail head be chilled to 430～200 ℃; And make rail head be lower than 0～60 ℃ of the flange of rail, or rail head is higher than 0～50 ℃ of the flange of rail.Transition by spray cooling makes the rail cooling evenly, and discharge is easy to control, has made things convenient for the operator, thereby makes the stability of quenching technology and product performance improve greatly, has improved cooling performance.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and by above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification sheets, must determine its technical scope according to the claim scope.
Claims (3)
1. heat treatment method for steel rail, pass through line-frequency induction heating unit (2) earlier with the whole preheating of rail (4), 450～600 ℃ of rail heads, 380～450 ℃ of the flanges of rail, use intermediate frequency induction heating device (3) that rail head is heated to 800～1000 ℃ again, it is characterized in that, with air-jet device (5) pressurized air is sprayed 800～600 ℃ of cold rail heads, it is cooled off under physical environment, use spraying plant (6) to make rail head be cooled to 700～500 ℃ again, use waterworks (7) to make rail head be chilled to 430～200 ℃ at last.
2. heat treatment method for steel rail according to claim 1 is characterized in that, spraying plant () 6 is between air-jet device (5) and the waterworks (7), extenuates the cooling range between air-jet device (5) and the waterworks (7).
3. heat treatment method for steel rail according to claim 1 is characterized in that, after air-jet device (5) cooling, make rail head be lower than 0～60 ℃ of the flange of rail, or rail head is higher than 0～50 ℃ of the flange of rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910232288A CN101701284A (en) | 2009-12-11 | 2009-12-11 | Heat treatment method for steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910232288A CN101701284A (en) | 2009-12-11 | 2009-12-11 | Heat treatment method for steel rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101701284A true CN101701284A (en) | 2010-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910232288A Pending CN101701284A (en) | 2009-12-11 | 2009-12-11 | Heat treatment method for steel rail |
Country Status (1)
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| CN (1) | CN101701284A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105483347A (en) * | 2015-12-10 | 2016-04-13 | 内蒙古包钢钢联股份有限公司 | Heat treatment technology for pearlite steel rail hardening |
| CN110093481A (en) * | 2019-05-24 | 2019-08-06 | 上海工程技术大学 | A kind of track process for quenching based on induction heating |
| CN116179827A (en) * | 2023-02-14 | 2023-05-30 | 铁科（北京）轨道装备技术有限公司 | Switch rail heat treatment process and switch |
-
2009
- 2009-12-11 CN CN200910232288A patent/CN101701284A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104046765B (en) * | 2014-02-20 | 2016-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of heat treating method of hypereutectoid rail |
| US9777351B2 (en) | 2014-02-20 | 2017-10-03 | Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. | Method for heat treatment of hypereutectoid steel rail |
| CN105483347A (en) * | 2015-12-10 | 2016-04-13 | 内蒙古包钢钢联股份有限公司 | Heat treatment technology for pearlite steel rail hardening |
| CN110093481A (en) * | 2019-05-24 | 2019-08-06 | 上海工程技术大学 | A kind of track process for quenching based on induction heating |
| CN116179827A (en) * | 2023-02-14 | 2023-05-30 | 铁科（北京）轨道装备技术有限公司 | Switch rail heat treatment process and switch |
| CN116179827B (en) * | 2023-02-14 | 2024-02-23 | 铁科（北京）轨道装备技术有限公司 | Switch rail heat treatment process and switch |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100505 |