CN1075985A - Heat treatment method for steel rail and device - Google Patents
Heat treatment method for steel rail and device Download PDFInfo
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- CN1075985A CN1075985A CN 92113263 CN92113263A CN1075985A CN 1075985 A CN1075985 A CN 1075985A CN 92113263 CN92113263 CN 92113263 CN 92113263 A CN92113263 A CN 92113263A CN 1075985 A CN1075985 A CN 1075985A
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- rail
- cooling
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- nozzle
- rail head
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Abstract
The invention belongs to the rail heat treatment technics.A kind of heat treating method of producing high duty rails the steps include: with the double frequency induction heating device rail to be carried out preheating and heating earlier, then air cooling, pressurized air cooling, water spray cooling and control heat treatment deformation.Because " water behind the first wind " heat treating method is adopted in rail cooling, can make it have process stabilizing, easy and simple to handle, characteristics such as performance is good.Nozzle axis and nozzle surface have certain angle in the air-jet device, and nozzle is quincunx and distributes, and has improved cooling performance, has saved the pressurized air consumption.
Description
The invention belongs to a kind of heat treatment technics that is used for rail.
As existing rail heat treatment technics, Chinese patent 88105864.5 has been narrated a kind of heat treating method of producing high duty rails in detail.This method is to use the whole preheating of line-frequency induction earlier, arrives quenching temperature with the heating in medium frequency rail's end portion again, and then with the pressurized air cooling, subsequent spray cools off (being called for short " mist behind the first wind " quenching technology) above-mentioned technology and has following deficiency:
1. mist is water and AIR MIXTURES, is subject to air pressure, the influence of discharge fluctuation, and long-term practice proves that existing during spray cooling " breathing " phenomenon is difficult to overcome all the time both at home and abroad.Above-mentioned reason certainly will influence the stability and the product performance of quenching technology; 2. will control the rail deflection in allowed band, must control the rail head temperature and be higher than flange of rail temperature in 50～100 ℃ of scopes, this brings certain degree of difficulty to the operator; 3. use pressurized air refrigerative air-jet device structure not too reasonable, cause serious interference between the air-flow of at a high speed ejection and the air-flow that the rail surface is returned, influenced cooling performance, so the pressurized air consumption is bigger, reaches 40～70m
3/ min.
The objective of the invention is to overcome the shortcoming of above-mentioned patent, promptly the water with stable single medium replaces the mist of unsettled pair of medium to carry out quench cooled, is called for short " water behind the first wind " quenching technology.This technology can guarantee the stability of thermal treatment process, good product quality.Another object of the present invention is, provides a kind of making to spray air-flow at a high speed and do not disturb mutually between rail surface reflection air-flow, the low and air-jet device of good cooling results of pressurized air consumption.
A kind of heat treating method of producing high duty rails provided by the present invention the steps include: earlier rail to be used the whole preheating of power frequency induction heating device, makes it be preheating to following temperature with predetermined rate of heating: 560～650 ℃ of rail heads, 460～560 ℃ of the flanges of rail.With intermediate frequency induction heating device its head is heated to predetermined thermal treatment temp again, it generally is 860～1020 ℃ (referring to the rail head surface temperature), air cooling arrives predetermined temperature range under physical environment then, it generally is 790～720 ℃, so that the rail's end portion temperature is even, and helps suitably deepening hardened layer and reduce the heat-eliminating medium consumption.Subsequently with being configured in rail's end portion air-jet device on every side, with 20～40m
3The flow of/min sprays to rail's end portion with pressurized air, makes its speed of cooling with 2.5～15 ℃/s be cooled to 600～350 ℃.Then, with being configured in rail's end portion equipment water jetting cooler on every side, with 0.55～0.85m
3The flow of/h sprays to rail's end portion with 20～50 ℃ warm water, make its speed of cooling be cooled to 500～250 ℃ with 4.8～17.5 ℃/s, thereby guarantee that the rail's end portion surface obtains the nodular troostite tissue that hardness evenly descends inwards to 15～25mm scope, its Vickers' hardness is that 400～306(Brinell hardness is 390～300HB).Determining of the cooled rail head temperature of spraying water, not only to consider the metallographic structure that obtained, also to consider to make the certain temperature difference of maintenance between the rail head and the flange of rail, its scope is that the rail head temperature is lower than 0～75 ℃ of flange of rail temperature, or the rail head temperature is higher than 0～45 ℃ of flange of rail temperature, with the control rail after heat treatment along its length deflection less than 100mm/25m.
In whole heat treatment process, rail is with respect to the unidirectional movement continuously of thermal treatment unit, and its speed can reach 1.0～1.8m/min.
Described air-jet device is made up of the shower nozzle of cooling rail head of rail tread and the shower nozzle of cooling rail head two sides.Have dozens of to be the nozzle that quincunx is arranged in each shower nozzle, the angle α of nozzle centerline and nozzle surface is 79～45 °, and promptly the angle between nozzle centerline and rail longitudinal cenlerline is 11～45 °, and nozzle inside diameter is 1～8mm.In order to regulate the speed of cooling of tread and two sides respectively, each shower nozzle joins with the control valve of compressed air source respectively.Open control valve, pressurized air sprays to rail head at a high speed from nozzle.Because high velocity air and rail longitudinal axis form an angle, make and fully to carry out heat exchange by the ejection airflow smooth that therefore, the pressurized air consumption reduces to 20～40m
3/ min.
Adopt the present invention can reach following effect:
1. since of the present invention be earlier air-cooled back water-cooled, all are stable single media, the operator is easy to control and regulates.Therefore, technology stability is good, the homogeneity of the quality that can guarantee to quench.Compare with " mist behind the first wind " method with the rail quality that this method is produced, its performance index make moderate progress, and see table 1 for details.
Performance index contrast after the thermal treatment of table 1 60kg/m rail
| Quenching method | Rail is transferred speed (m/min) | Compressed air consumption (m 3/min) | Case depth (mm) | σ b(MPa) | σ 0.2(MPa) | δ 5(%) | |
| Former invention | Mist behind elder generation's wind | 1.21 | 55 | ≥15 | 1175 | 825 | 11 |
| The present invention | Water behind elder generation's wind | 1.28 | 32 | ≥15 | 1249 | 845 | 13 |
2. adopt air-jet device of the present invention, eliminated the interference between high velocity air, improved cooling performance, so compressed air consumption can save 20～50%.
3. adopt method tissue of the present invention production, allow the temperature range between the rail head and the flange of rail bigger, this brings great convenience to the operator.
The rail thermal treatment of the various materials of models such as the present invention can be used for 50,60,75kg/m.
Fig. 1 is the example side-view of the method for the invention.
Fig. 2 air-jet device scheme of installation.
Fig. 3 air-jet device side-view.
Fig. 4 is brineling result on the cross section after the thermal treatment of 60kg/m rail.
Give an example in conjunction with the accompanying drawings with regard to main points of the present invention below, described in detail.
Fig. 1 is embodiments of the invention.Feed rolls 1 is sent into rail 6 continuous uniaxiallies in the thermal treatment unit with the speed of 1.0～1.8m/min and is heat-treated.Primary heater unit 2 is the line-frequency induction well heater, and it covers on the rail entirely, utilizes the induced current that is produced that each position of rail is preheating to 460～650 ℃ respectively.Heating unit 3 is an intermediate frequency inductor, and it only covers on rail's end portion, utilizes the induced current that is produced that rail's end portion is heated to 860～1020 ℃.Then, make the proper temperature of rail between air cooling to 790～720 under the physical environment temperature ℃, with reach the rail's end portion temperature further evenly.Spray air-cooling device 4 is with 20～40m
3The flow of/min sprays to rail's end portion with pressurized air, makes its speed of cooling with 2.5～15 ℃/s be cooled to 600～350 ℃, again with being configured in rail's end portion equipment water jetting cooler 5 on every side, with 0.55～0.85m
3The flow of/h sprays to rail's end portion with 20～50 ℃ warm water, makes its speed of cooling with 4.8～17.5 ℃/s be cooled to 500～250 ℃, and makes the certain temperature difference of maintenance between the rail head and the flange of rail, and promptly the rail head temperature is lower than 0～75 ℃ of flange of rail temperature; Or the rail head temperature is higher than 0～45 ℃ of flange of rail temperature.Like this, can make after the rail thermal treatment along its length deflection less than 100mm/25m.
In Fig. 2, air-jet device 4 is made up of shower nozzle 7 and 2 (or 2 groups) shower nozzles 8, and shower nozzle 7 is used to cool off rail tread.Shower nozzle 8 is used to cool off the rail head both sides.They are connected to the compressed air source control valve respectively.Dozens of nozzle 9(Fig. 3 is arranged on each shower nozzle), the angle α between nozzle axis and nozzle surface is 79～45 °, and nozzle inside diameter is 1～8mm, and nozzle 9 is quincunx and arranges.
Embodiment
Its chemical ingredients of 60kg/m rail is: 0.75%C, and 0.20%Si, 0.78%Mn, 0.019%P, 0.023%S, all the other are iron and trace element.Rail carries out the thermal treatment of following condition with the present invention under the handover speed of 1.28m/min: earlier through the preheating of line-frequency induction heating unit, and 580 ℃ of rail's end portion temperature, 520 ℃ of the flanges of rail; Again with intermediate frequency induction heating device heating rail head tread to 900 ℃; Air cooling to 760 ℃ subsequently; The air-jet device flow is 32m
3The compressed air spraying rail's end portion of/min makes its speed of cooling with 9.6 ℃/s be cooled to 510 ℃; Be 0.78m with flow again
330 ℃ of warm water of/h spray to rail's end portion, make its speed of cooling with 10.5 ℃/s be cooled to 280 ℃, and make the rail's end portion temperature lower 10 ℃ than flange of rail temperature.The mechanical property of rail after by this method thermal treatment is: σ
b=1301.7MPa, σ
0.2=890.3MPa, δ
5=14.1%, case depth 〉=15mm, the each point Brinell hardness number distributes and sees Fig. 4 on the rail head cross section.On the 25m rail, deflection along its length is 23mm.
Claims (4)
1, a kind of heat treating method of producing high duty rails is characterized in that: rail is preheating to following temperature with power frequency induction heating device integral body, 560～650 ℃ of rail heads, 460～560 ℃ of the flanges of rail earlier; With intermediate frequency induction heating device rail head is heated to 860～1020 ℃ again; Air cooling to 790～720 ℃ subsequently; With air-jet device with 20～39m
3The pressurized air of/min sprays cold rail head, makes its speed of cooling with 2.5～15 ℃/s be chilled to 600～350 ℃; With being configured in rail head waterworks on every side with 0.5～0.86m
3The flow of/h sprays to rail head with 20～50 ℃ water, makes its cooling rate with 4.8～17.5 ℃/s reduce to 500～250 ℃.
2, method according to claim 1 is characterized in that: after the water spray cooling, make the certain temperature head of maintenance between its rail head and the flange of rail, its scope is that rail head is lower than 0～75 ℃ of the flange of rail, or rail head is higher than 0～45 ℃ of the flange of rail.
3, the air-jet device used of a kind of rail thermal treatment, it is made up of the shower nozzle of cooling rail tread and the shower nozzle of cooling both sides, it is characterized in that: have dozens of to be the high-velocity nozzle that quincunx distributes in each shower nozzle, the angle α of nozzle axis and nozzle surface is 79～45 °, nozzle inside diameter 1～8mm.
4, device according to claim 3 is characterized in that: the shower nozzle that is in the rail head tread joins with compressed-air actuated source of the gas control valve respectively with the shower nozzle that is in the rail head both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92113263 CN1032656C (en) | 1992-11-26 | 1992-11-26 | Heat treatment method and apparatus for rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92113263 CN1032656C (en) | 1992-11-26 | 1992-11-26 | Heat treatment method and apparatus for rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1075985A true CN1075985A (en) | 1993-09-08 |
| CN1032656C CN1032656C (en) | 1996-08-28 |
Family
ID=4946321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92113263 Expired - Lifetime CN1032656C (en) | 1992-11-26 | 1992-11-26 | Heat treatment method and apparatus for rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1032656C (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044723C (en) * | 1996-09-27 | 1999-08-18 | 攀枝花钢铁（集团）公司钢铁研究院 | Heat treatment method for vanadium-contained alloy steel rail |
| CN1304603C (en) * | 2002-11-20 | 2007-03-14 | 东碧工业株式会社 | Part heat treatment method for parts to be heat treated and apparatus thereof |
| CN100404702C (en) * | 2004-05-17 | 2008-07-23 | 都美工业株式会社 | Heat processing unit case heat treating method and its device |
| CN100404701C (en) * | 2004-05-18 | 2008-07-23 | 都美工业株式会社 | Heat processing unit case heat treating method and its device |
| CN102086620A (en) * | 2010-03-19 | 2011-06-08 | 呼和浩特铁路局焊轨段 | Double-frequency process for normalizing rail welding seams |
| CN102086619A (en) * | 2010-03-19 | 2011-06-08 | 呼和浩特铁路局焊轨段 | Double-frequency equipment and process for normalizing rail welding seams |
| CN102134632A (en) * | 2011-01-18 | 2011-07-27 | 浙江大学 | Inflating device for blowing off water droplet |
| CN101394690B (en) * | 2007-09-12 | 2013-03-27 | 应达公司 | Electric induction heating of a rail head with non-uniform longitudinal temperature distribution |
| 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 |
| CN107541596A (en) * | 2017-08-28 | 2018-01-05 | 芜湖中铁科吉富轨道有限公司 | A kind of burning optimization on line technique of U75V rail |
| CN110592355A (en) * | 2019-09-27 | 2019-12-20 | 武汉钢铁有限公司 | Production method for reducing residual stress of heat-treated steel rail and steel rail obtained by production method |
| CN110923619A (en) * | 2019-12-20 | 2020-03-27 | 嘉兴兴欣标准件热处理有限公司 | Carburizing and quenching composite heat treatment production line and treatment method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100443599C (en) * | 2007-02-08 | 2008-12-17 | 武汉钢铁(集团)公司 | Heat treatment method for high strength heavy type steel rail head |
| RU2755713C1 (en) * | 2020-06-05 | 2021-09-20 | Общество с ограниченной ответственностью "Информационные технологии" (ООО "ИнфоТех") | Apparatus and method for heat treatment of a long-length product with an l-shaped profile with a sole, neck, head |
-
1992
- 1992-11-26 CN CN 92113263 patent/CN1032656C/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1044723C (en) * | 1996-09-27 | 1999-08-18 | 攀枝花钢铁（集团）公司钢铁研究院 | Heat treatment method for vanadium-contained alloy steel rail |
| CN1304603C (en) * | 2002-11-20 | 2007-03-14 | 东碧工业株式会社 | Part heat treatment method for parts to be heat treated and apparatus thereof |
| CN100404702C (en) * | 2004-05-17 | 2008-07-23 | 都美工业株式会社 | Heat processing unit case heat treating method and its device |
| CN100404701C (en) * | 2004-05-18 | 2008-07-23 | 都美工业株式会社 | Heat processing unit case heat treating method and its device |
| CN101394690B (en) * | 2007-09-12 | 2013-03-27 | 应达公司 | Electric induction heating of a rail head with non-uniform longitudinal temperature distribution |
| CN102086619B (en) * | 2010-03-19 | 2013-05-01 | 呼和浩特铁路局焊轨段 | Double-frequency equipment and process for normalizing rail welding seams |
| CN102086620B (en) * | 2010-03-19 | 2013-01-16 | 呼和浩特铁路局焊轨段 | Double-frequency process for normalizing rail welding seams |
| CN102086619A (en) * | 2010-03-19 | 2011-06-08 | 呼和浩特铁路局焊轨段 | Double-frequency equipment and process for normalizing rail welding seams |
| CN102086620A (en) * | 2010-03-19 | 2011-06-08 | 呼和浩特铁路局焊轨段 | Double-frequency process for normalizing rail welding seams |
| CN102134632A (en) * | 2011-01-18 | 2011-07-27 | 浙江大学 | Inflating device for blowing off water droplet |
| 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 |
| CN107541596A (en) * | 2017-08-28 | 2018-01-05 | 芜湖中铁科吉富轨道有限公司 | A kind of burning optimization on line technique of U75V rail |
| CN107541596B (en) * | 2017-08-28 | 2018-12-25 | 芜湖中铁科吉富轨道有限公司 | A kind of burning optimization on line technique of U75V rail |
| CN110592355A (en) * | 2019-09-27 | 2019-12-20 | 武汉钢铁有限公司 | Production method for reducing residual stress of heat-treated steel rail and steel rail obtained by production method |
| CN110923619A (en) * | 2019-12-20 | 2020-03-27 | 嘉兴兴欣标准件热处理有限公司 | Carburizing and quenching composite heat treatment production line and treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032656C (en) | 1996-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| CI01 | Correction of invention patent gazette |
Correction item: The patent application is deemed to be withdrawn Correct: delete False: C21D9/04 92113263.8 1993.09.08 Number: 29 Page: 128 Volume: 11 |
|
| ERR | Gazette correction |
Free format text: CORRECT: DEEMED WITHDRAWAL OF APPLICATION FOR PATENT; FROM: C21D 9.04 92113263.8 93.9.8 TO: DELETION |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHONGYE SAIDI ENGINEERING TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: CHONGQING IRON AND STEEL DESIGN INST., MINISTRY OF METALLURGICAL INDUSTRY |
|
| CP03 | Change of name, title or address |
Address after: 400013 No. 1, Shuang Steel Road, Shizhong District, Chongqing Patentee after: Zhongye Saide Engineering Technology Co., Ltd. Address before: 630013, No. 1, Shuang Steel Road, Shizhong District, Sichuan, Chongqing Patentee before: Chongqing Iron and Steel Design Inst., Min MI |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121126 Granted publication date: 19960828 |