CN105483347A - Heat treatment technology for pearlite steel rail hardening - Google Patents
Heat treatment technology for pearlite steel rail hardening Download PDFInfo
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- CN105483347A CN105483347A CN201510909978.4A CN201510909978A CN105483347A CN 105483347 A CN105483347 A CN 105483347A CN 201510909978 A CN201510909978 A CN 201510909978A CN 105483347 A CN105483347 A CN 105483347A
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- temperature
- steel rail
- heat treatment
- hardening
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- 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
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- 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 relates to a heat treatment technology for pearlite steel rail hardening. The heat treatment technology for pearlite steel rail hardening is characterized in that a steel rail is heated to 880 DEG C to 920 DEG C, the temperature is kept for 10 minutes to 15 minutes, according to the different types of steel, the temperature is decreased to be within the specific temperature interval according to the specific cooling speed range and is kept for 30 seconds, and air cooling is conducted; the air cooling includes the specific steps that according to the pearlite steel rail hardening process system adopting a U75 V material, the temperature ranging from 880 DEG C to 920 DEG C is kept for 10 minutes to 15 minutes, the temperature is decreased to 570 DEG C to 600 DEG C with the cooling speed being 8 DEG C/s to 15 DEG C/s, and then the temperature is decreased to 20 DEG C to 25 DEG C with the cooling speed being 0.2 DEG C/s to 0.5 DEG C/s in an air cooling manner; and according to the pearlite steel rail hardening process system adopting a U76 CrRE material, the temperature ranging from 850 DEG C to 900 DEG C is kept for 10 minutes to 15 minutes, the temperature is decreased to 590 DEG C to 610 DEG C with the cooling speed being 6 DEG C/s to 10 DEG C/s, and then the temperature is decreased to 20 DEG C to 25 DEG C with the cooling speed being 0.2 DEG C/s to 0.5 DEG C/s in an air cooling manner. The heat treatment technology has the advantages that the specific hardening heat treatment technology of steel rails made of certain specific components is standardized, operability is high, optimum matching of the hardening heat treatment technology and the components of the steel rails is achieved, and the hardening effect of the steel rails is achieved.
Description
Technical field
The invention belongs to heat-treatment of rail technical field, be specifically related to the thermal treatment process of a kind of pearlite steel rail sclerosis.
background technology
The development of national economy impels the Railway Investment of China to increase year by year, is increased to 8,000 hundred million as 2014 by 6,200 hundred million in the original plan, and the transport power of railway and travelling speed also increase substantially in recent years simultaneously, also harsher to the requirement of heavy rail performance.
Along with transportation by railroad is progressively to the development of high speed, heavy duty, the intensity of rail and the hardness of rail head are had higher requirement.The intensity of rail is improved and tread hardness is a kind of comparatively energy-conservation, economic method by heat-treatment of rail technology.The heat treatment technics of pearlite steel rail mainly contains that total length is online, out-line quenching, and to realize most economical, the most effective measures of rail highly malleablized be exactly the thermal treatment of total length press quenching.
Current heat-treatment of rail technology mainly contains " after first wind mist " and " first air-cooled and water-cooled ".When heat-treatment of rail, final cooling temperature control ratio is more wide in range.As publication number be CN101701284A patent describes heat treatment method for steel rail, the method is first pass through line-frequency induction heating unit by overall for rail preheating, rail head 450-600 DEG C, flange of rail 380-450 DEG C, with intermediate frequency induction heating device, rail head is heated to 800-1000 DEG C again, with air-jet device, pressurized air is sprayed cold rail head 800-600 DEG C, make it cool under physical environment subsequently, make rail head be cooled to 700-500 DEG C with spraying plant again, finally make rail head be chilled to 430-200 DEG C with waterworks.Be as cold as 700-500 DEG C, differ 200 DEG C, if temperature is higher, in tissue, ferrite is more, may not reach hardening effect, if temperature is lower, may occur bainite or martensite in tissue, affects the entirety military service performance of rail.For another example publication number is the heat treating method that patent describes a kind of high strength heavy type steel rail head of CN101016580A, when cooling, the surface temperature of heavy type steel rail head is cooled to 400-600 DEG C by air-jet device by cooling air, and speed of cooling is 18 ~ 20 DEG C/s; Then naturally cooling is carried out.In this patent, the final cooling temperature difference of rail also has 200 DEG C.
So need realize when heat-treatment of rail accurately controlling thermal treatment temp and cooling rate, the appearance of guarantee hardness and control abnormal structure, namely can not there is bainite or martensitic stucture in standard regulation, and meet the requirement of situ production time rhythm.
Summary of the invention
The present invention seeks to for above-mentioned prior art Problems existing, provide one can accurately control heat-treatment of rail temperature and cooling rate, while hardening rail, avoid the thermal treatment process that the pearlite steel rail of abnormal structure hardens.
For achieving the above object, technical scheme of the present invention is as follows:
Rail is heated to 880-920 DEG C, according to structural transformation and situ production rhythm, insulation 10-15 minute, different according to steel grade, be as cold as specific temperature range insulation 30s with specific cooling rate scope, then air cooling, is specially: to be the pearlite steel rail hardening process system of U75V be material: 880-920 DEG C of insulation 10-15 minute, 570-600 DEG C is cooled to 8-15 DEG C/s cooling rate, then with the cooling rate air cooling of 0.2-0.5 DEG C/s to 20-25 DEG C; Material is the pearlite steel rail hardening process system of U76CrRE: 850-900 DEG C of insulation 10-15 minute, is cooled to 590-610 DEG C with 6-10 DEG C/s cooling rate, then with the cooling rate air cooling of 0.2-0.5 DEG C/s to 20-25 DEG C.
Advantage of the present invention is: the concrete hardening heat treatment process of specification a certain special component rail, strong operability, realizes the optimum matching of hardening heat treatment process and rail composition, realizes the hardening effect of rail.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation:
Embodiment 1:U75V pearlite steel rail
Embodiment 2:U76CrRE pearlite steel rail
Claims (1)
1. the thermal treatment process of a pearlite steel rail sclerosis, it is characterized in that: rail is heated to 880-920 DEG C, insulation 10-15 minute, different according to steel grade, be as cold as specific temperature range insulation 30s with specific cooling rate scope, then air cooling, is specially: to be the pearlite steel rail hardening process system of U75V be material: 880-920 DEG C of insulation 10-15 minute, 570-600 DEG C is cooled to 8-15 DEG C/s cooling rate, then with the cooling rate air cooling of 0.2-0.5 DEG C/s to 20-25 DEG C; Material is the pearlite steel rail hardening process system of U76CrRE: 850-900 DEG C of insulation 10-15 minute, is cooled to 590-610 DEG C with 6-10 DEG C/s cooling rate, then with the cooling rate air cooling of 0.2-0.5 DEG C/s to 20-25 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510909978.4A CN105483347A (en) | 2015-12-10 | 2015-12-10 | Heat treatment technology for pearlite steel rail hardening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510909978.4A CN105483347A (en) | 2015-12-10 | 2015-12-10 | Heat treatment technology for pearlite steel rail hardening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105483347A true CN105483347A (en) | 2016-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510909978.4A Pending CN105483347A (en) | 2015-12-10 | 2015-12-10 | Heat treatment technology for pearlite steel rail hardening |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755900A (en) * | 2016-12-14 | 2017-05-31 | 内蒙古包钢钢联股份有限公司 | High-strength and high ductility bainite rail and its in the cold technique of line traffic control |
| CN107520529A (en) * | 2017-08-31 | 2017-12-29 | 攀钢集团研究院有限公司 | The method that 136RE+SS heat-treated rails move Flash Butt Welding |
| CN107557557A (en) * | 2017-08-07 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of burning optimization on line method for being used to eliminate rail abnormal structure |
| CN108676974A (en) * | 2018-06-21 | 2018-10-19 | 安徽意力电缆有限公司 | A kind of processing technology of traffic track steel |
| DE102018125047A1 (en) | 2017-10-10 | 2019-04-11 | Pangang Group Research Institute Co., Ltd. | Rail of a railway line with mixed passenger and freight traffic and method for its production |
| US10850315B2 (en) | 2017-10-10 | 2020-12-01 | Pangang Group Research Institute Co., Ltd. | High-toughness and plasticity hypereutectoid rail and manufacturing method thereof |
| CN113416822A (en) * | 2021-05-20 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment method for improving hardness of U76CrRE heat treatment steel rail gas pressure welding joint |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016580A (en) * | 2007-02-08 | 2007-08-15 | 武汉钢铁股份有限责任公司大型轧钢厂 | Heat treatment method for high strength heavy type steel rail head |
| CN101701284A (en) * | 2009-12-11 | 2010-05-05 | 吴良坤 | Heat treatment method for steel rail |
| CN105051220A (en) * | 2013-03-27 | 2015-11-11 | 杰富意钢铁株式会社 | Pearlite rail and method for manufacturing pearlite rail |
-
2015
- 2015-12-10 CN CN201510909978.4A patent/CN105483347A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016580A (en) * | 2007-02-08 | 2007-08-15 | 武汉钢铁股份有限责任公司大型轧钢厂 | Heat treatment method for high strength heavy type steel rail head |
| CN101701284A (en) * | 2009-12-11 | 2010-05-05 | 吴良坤 | Heat treatment method for steel rail |
| CN105051220A (en) * | 2013-03-27 | 2015-11-11 | 杰富意钢铁株式会社 | Pearlite rail and method for manufacturing pearlite rail |
Non-Patent Citations (1)
| Title |
|---|
| 张智等: "U76CrRE钢轨的热处理", 《金属热处理》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755900A (en) * | 2016-12-14 | 2017-05-31 | 内蒙古包钢钢联股份有限公司 | High-strength and high ductility bainite rail and its in the cold technique of line traffic control |
| CN107557557A (en) * | 2017-08-07 | 2018-01-09 | 包头钢铁（集团）有限责任公司 | A kind of burning optimization on line method for being used to eliminate rail abnormal structure |
| CN107520529A (en) * | 2017-08-31 | 2017-12-29 | 攀钢集团研究院有限公司 | The method that 136RE+SS heat-treated rails move Flash Butt Welding |
| CN107520529B (en) * | 2017-08-31 | 2019-10-11 | 攀钢集团研究院有限公司 | The method of the mobile Flash Butt Welding of 136RE+SS heat-treated rail |
| DE102018125047A1 (en) | 2017-10-10 | 2019-04-11 | Pangang Group Research Institute Co., Ltd. | Rail of a railway line with mixed passenger and freight traffic and method for its production |
| US10850315B2 (en) | 2017-10-10 | 2020-12-01 | Pangang Group Research Institute Co., Ltd. | High-toughness and plasticity hypereutectoid rail and manufacturing method thereof |
| CN108676974A (en) * | 2018-06-21 | 2018-10-19 | 安徽意力电缆有限公司 | A kind of processing technology of traffic track steel |
| CN113416822A (en) * | 2021-05-20 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment method for improving hardness of U76CrRE heat treatment steel rail gas pressure welding joint |
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Application publication date: 20160413 |