CN107502730A - The post weld heat treatment method of 136RE+SS heat-treated rail welding points - Google Patents
The post weld heat treatment method of 136RE+SS heat-treated rail welding points Download PDFInfo
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- CN107502730A CN107502730A CN201710775423.4A CN201710775423A CN107502730A CN 107502730 A CN107502730 A CN 107502730A CN 201710775423 A CN201710775423 A CN 201710775423A CN 107502730 A CN107502730 A CN 107502730A
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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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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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
Abstract
The invention discloses a kind of post weld heat treatment method of 136RE+SS heat-treated rails welding point, particularly a kind of post weld heat treatment method for the 136RE+SS heat-treated rail welding points for being related to rail welding technique field.The post weld heat treatment method of the 136RE+SS heat-treated rail welding points of the present invention, including following steps：A, more than heated weld seam line regions to Ac3 critical-temperatures after 860 DEG C 940 DEG C of peak temperature；B, heating region is quickly cooled down, cooling velocity control will be made in 2.0 DEG C/s, 3.5 DEG C/s；C, when it is 400 DEG C 470 DEG C that weld seam wheel tread temperature, which is down to final cooling temperature, quick cooling is stopped；D, Welded Joints carry out naturally cooling to room temperature.The present processes, it is possible to prevente effectively from the precipitation of the rail head martensitic structure of 136RE SS heat-treated rail joints, the particularly mechanical property of raising 136RE SS heat-treated rail welding points, impact flexibility, and make longitudinal hardness reasonable layout under joint tread, reduction softening sector width.
Description
Technical field
The present invention relates to a kind of post weld heat treatment method of 136RE+SS heat-treated rails welding point, particularly one kind relates to
And the post weld heat treatment method of the 136RE+SS heat-treated rail welding points in rail welding technique field.
Background technology
In order to adapt to the needs of Transportation Development, gapless track gapless line to heavy-duty while developing, it is necessary to
Improve its intensity, toughness, through both at home and abroad for many years it was verified that rail carry out Full length quenching can improve rail abrasion resisting, resistance to compression burst,
Antistripping, antifatigue, impact resistance, can extend its service life, be most effective, the most economical side for improving line quality
Method.After weld formation, weld seam nearby due to being influenceed by welding high temperature, causes grain coarsening, plasticity, toughness are big to full quenching rail
Amplitude declines.Simultaneously in weld heat-affected zone, former quench-hardened case will disappear, and produce the soft area that width is about 100mm or so.
This increases the fragility for making steel rail welding line, and joint earth subsidence is also easy to produce in use and induces the generation of undulatory wear, and shortening uses the longevity
Life.
Generally enter after current domestic flash welding in rail or gas pressure welding welding by the standard requirements of TB/T 1632 at 900 DEG C or so
Row postwelding normalizing heat treatment technique, room temperature is air-cooled to after being heated to 900 DEG C of peak temperature using Medium frequency induction electricity or oxyacetylene torch,
Air-cooled technique is even taken after normalizing further to improve tread hardness.On the one hand postwelding normalizing heat treatment can improve rail
The mechanical property of joint, in particular so that impact flexibility improves significantly；On the other hand it is to significantly reduce welding point stress, avoids
Extended in the cracked hurt of welding point in " S " type, so as to ensure the security performance of welding point.As common pearlite
The rail (such as U71Mn, U75V rail) of type because carbon content be less than 0.80%, and with tendency of hardenability alloying element compared with
Few, postwelding employs the technique cooled down after 900 DEG C or so peak temperature heating, is not required to consider the martensitic structure for hardenability occur.
136RE SS heat-treated rails belong to high-carbon Li-adding Al alloy, Cr the and Fe shapes in steel as AREMA normal intensity rail
Into continuous solid solution, a variety of carbide are formed with carbon, the intensity and wearability of steel can be improved, increase quenching degree, are improved anti-oxidant
This rail tread hardness is higher than U71Mn rail with resistance to corrosion, and Cr is residual elements in U71Mn, and its content must not exceed
0.15%.Its tensile strength height (1000-1200MPa or so), hardness height (390-410HV or so), carrying out at postwelding normalizing
During reason, easily there is martensitic structure, the reduction of the serious mechanical property for reducing joint, mainly toughness plasticity energy.Martensite
Tissue category is harmful to brittlement phase, should do the best and avoid during postwelding normalized treatment.136RE SS heat-treated rail property of welded joints
The influence of post weld heat treatment technique is significantly limited by with quality, it is important to open the shadow of the factors such as cold temperature, cooling velocity
Ring.
Application No. 201410058292.4, entitled " a kind of heat treatment method of hypereutectoid rail ", is disclosed
A kind of heat treatment method of hypereutectoid rail during Rolling production, this method include finishing temperature being higher than
900 DEG C of rail carries out isothermal holding, make the rail after isothermal holding is carried out under the first cooling velocity the first stage cool down with
The rail head surface temperature of rail is down to 700-750 DEG C, second stage cooling is carried out under the second cooling velocity followed by rail
So that the rail head surface temperature of rail is down into 550 DEG C, then rail is set to carry out phase III cooling under the 3rd cooling velocity to incite somebody to action
The rail head surface temperature of rail is down to less than 450 DEG C, then makes rail continue to cool down in atmosphere.This method related generally to common
The Technology for Heating Processing of rail is analysed, is to prepare a kind of high-carbon hypereutectoid rail that can reduce secondary cementite precipitation, full mistake
Journey is divided into three-stage cooling.It is to belong to different technical process from steel rail weld joint post weld heat treatment, and starts wind chill temperatures
Difference, the purpose of control are different.
Application No. 201410135909.8, a kind of entitled " post weld heat treatment of bainite rail welding point
Method ", discloses a kind of bainite rail postwelding joint heat-treating methods, this method include will welding obtain it is to be cooled
The welding point of bainite rail carries out being cooled to the first temperature not higher than 450 DEG C for the first time, then by after the first cooling
Welding point is heated to second temperature, then carries out the second cooling again, and the second temperature is higher than first temperature and not high
In 510 DEG C.This method mainly for the welding point of bainite rail post weld heat treatment technique, wherein, the bainite rail
Cooling initial temperature be 1300-1380 DEG C, second cooling after cooling termination temperature be room temperature.And hypereutectoid steel rail steel and horse
Family name's body, bainitic steel rail steel are that have entirely different micro- structure, and it is on fracture toughness, wearability and fatigue behaviour
Also have significantly different, therefore have different technological requirements in terms of heat treatment after welding to it.
Application No. 201510319185.7, the entitled " side of hypereutectoid steel rail weld joint post weld heat treatment
Method ", disclose a kind of process of hypereutectoid steel rail weld joint post weld heat treatment.When hypereutectoid steel rail glistens in the invention
It is right after weldering or air pressure plumb joint use intermediate frequency or the quick heated weld seam line regions of oxyacetylene torch to 900-920 DEG C of peak temperature
Heating zone carries out spray wind and quickly cooled down.The rail head weld impingement work(A of the inventive method processingku>=more than 18J, the punching of tunneling boring weld seam
Hit work(Aku>=more than 9J, the air-cooled region tread longitudinal direction hardness of joint welding reach the 90%-105% of mother metal, and softening sector width is small
In 20mm.The heat-treatment of rail process is invented mainly for the control of hypereutectoid steel secondary cementite.And 136RE SS
Heat-treated rail has entirely different micro- metallographic result with the hypereutectoid rail, the bainite rail that are referred in above invention,
It also has a notable difference on fracture toughness, wearability and fatigue behaviour, therefore has to it in terms of post weld heat treatment different
Technological requirement.
The content of the invention
The invention provides a kind of it is possible to prevente effectively from the rail head martensitic structure of 136RE SS heat-treated rail joints
Separate out, improve the mechanical property of 136RE SS heat-treated rail welding points, particularly impact flexibility, and making under joint tread
Longitudinal hardness reasonable layout, shorten the post weld heat treatment method of the 136RE+SS heat-treated rail welding points of softening sector width.
The present invention is the post weld heat treatment side of 136RE+SS heat-treated rail welding points used by solving the above problems
Method, including following steps：
A, more than heated weld seam line regions to Ac3 critical-temperatures after 860 DEG C -940 DEG C of peak temperature；
B, heating region is quickly cooled down, cooling velocity control will be made in 2.0 DEG C/s-3.5 DEG C/s；
C, when it is 400 DEG C -470 DEG C that weld seam wheel tread temperature, which is down to final cooling temperature, quick cooling is stopped；
D, Welded Joints carry out naturally cooling to room temperature.
It is further to have in step A using intermediate frequency or oxyacetylene torch heated weld seam line regions.
It is further to have in step B using spray wind method for rapid cooling, heating region is quickly cooled down.
Be further, in step B Welded Joints tread heating zone carry out spray wind quickly cool down.
It is further the rail rail in step B outside Welded Joints heating zone in the range of two side length 50mm-60mm
Head tread and side, and rail bottom center carry out spray wind and quickly cooled down.
It is further that air nozzle is apart from tread 20mm-70mm in step B.
It is further that it is 0.10MPa-0.50MPa that wind blast is sprayed in step B.
Be further, in step B Welded Joints tread heating zone carry out spray wind quickly cool down.
It is further that carrying out spray wind using air-jet device quickly cools down.
It is further, using infrared radiation thermometer automatic data collection and monitoring wheel tread temperature.
The beneficial effects of the invention are as follows：The present processes can effectively eliminate grain coarsening caused by welding high temperature, modeling
Property, toughness significantly decline, while in weld heat-affected zone, former quench-hardened case disappears so as to cause the fragility that this will make steel rail welding line
Increase, is also easy to produce joint earth subsidence and induces the generation of undulatory wear in use, the problem of reduction of service life.Using the application's
Heat treatment method can avoid the precipitation of the rail head martensitic structure of 136RE SS heat-treated rail joints, rail head weld impingement work(
Aku >=more than 12J, tunneling boring weld impingement work(Aku >=more than 10J, the air-cooled region tread longitudinal direction hardness of joint welding reach female
The 90%-102% of material, softening sector width are less than 20mm.
Brief description of the drawings
Fig. 1 is the vertical section low power sample of 136RE SS heat-treated rails post weld heat treatment joint in embodiment 1；
Fig. 2 be in embodiment 1 136RE SS heat-treated rails welding point heat treatment after tread 5.0mm at vertical section it is hard
Spend distribution map；
Fig. 3 is the microscopic structure of 136RE SS heat-treated rails post weld heat treatment joint in embodiment 4；
Fig. 4 is the microscopic structure of 136RE SS heat-treated rails postwelding air cooling joint in comparative example 3；
Fig. 5 is the microscopic structure of 136RE SS heat-treated rails post weld heat treatment joint in comparative example 4.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
The post weld heat treatment method of the 136RE+SS heat-treated rail welding points of the application, including following steps：
A, more than heated weld seam line regions to Ac3 critical-temperatures after 860 DEG C -940 DEG C of peak temperature；
B, heating region is quickly cooled down, cooling velocity control will be made in 2.0 DEG C/s-3.5 DEG C/s；
C, when it is 400 DEG C -470 DEG C that weld seam wheel tread temperature, which is down to final cooling temperature, quick cooling is stopped；
D, Welded Joints carry out naturally cooling to room temperature.
Weld seam nearby due to being influenceed by welding high temperature, causes grain coarsening, plasticity, toughness significantly decline.Weld simultaneously
Stitch in heat affected area, former quench-hardened case will disappear, and the rail after welding is heat-treated using the present processes, first by weld seam
Region is heated to more than Ac3 critical-temperatures 860 DEG C -940 DEG C, then the fast quickly cooling under 2.0 DEG C/s-3.5 DEG C/s speed control
But, grain coarsening caused by can effectively eliminating welding high temperature, plasticity, toughness significantly decline, while in weld heat-affected zone,
Former quench-hardened case is disappeared so as to cause this to increase the fragility for making steel rail welding line, and joint earth subsidence is also easy to produce in use and induces wave to grind
The generation of consumption, the problem of reduction of service life.136RE SS heat-treated rails can be avoided using the heat treatment method of the application
The precipitation of the rail head martensitic structure of joint, rail head weld impingement work(Aku>=more than 12J, tunneling boring weld impingement work(Aku≥10J
More than, the air-cooled region tread longitudinal direction hardness of joint welding reaches the 90%-102% of mother metal, and softening sector width is less than 20mm.
Have in step A using intermediate frequency or oxyacetylene torch heated weld seam line regions.Can be fast using intermediate frequency or oxyacetylene torch
Welded seam area is simultaneously accurately heated to more than Ac3 critical-temperatures 860 DEG C -940 DEG C by speed, impact flexibility is further enhanced.
Have in step B using spray wind method for rapid cooling, heating region is quickly cooled down.Wind is used in this application
Cold method, the heat exchange area of heating zone can be made full use of, cooling is quickly carried out in time, and can improved to cooling
The control accuracy of temperature and cooling velocity, air cooling equipment can be directly used, nozzle exit area is easy to adjust, easily operated.
Welded Joints tread heating zone carries out spraying wind method for rapid cooling in step B.Tread heating zone is sprayed
Wind quickly cools down, and can increase weld zone mother metal hardness, further shortens softening sector width.
The rail head of rail tread outside Welded Joints heating zone in the range of two side length 50mm-60mm and side in step B
Face, and rail bottom center carry out spray wind and quickly cooled down.Quick air-cooled rear weld zone mother metal hardness is carried out to area above to obtain
Further improve, short softening sector width further shortens.
Air nozzle is apart from tread 20mm-70mm in step B.Using foregoing spray wind distance heating region can be made fully to obtain
To heat exchange, to realize efficient fast cooling.
It is 0.10MPa-0.50MPa that wind blast is sprayed in step B.Foregoing spray wind blast is taken, realizes welding region fast
Prompt drop temperature.
Welded Joints tread heating zone carries out spraying wind method for rapid cooling in step B.Welded Joints tread heats
Area carries out spray wind, can further improve the hardness of material after welding.
Spray wind is carried out using air-jet device quickly to cool down.Easy to operate using air-jet device, cooling effectiveness is high, temperature control
System is accurate.
Can the promptly and accurately control cooling in cooling procedure using infrared radiation thermometer automatic data collection and monitoring wheel tread temperature
Temperature, so as to which weldquality after heat treatment be effectively ensured.
Embodiment
Embodiment 1：In WELDING JOINT PWHT procedures, when joint uses the quick electrical heating of Medium frequency induction
After welded seam area to 735 DEG C of Ac3 temperature+~more than 200 DEG C of 930 DEG C of peak temperature, heating zone is included to heating zone immediately
Rail head of rail tread and side in the range of outer two side lengths 55mm, and rail bottom center carry out compressed air cooling.Control is opened cold
Temperature is preferably to stop 840 DEG C after heating, immediately begins to carry out rail head tread and flange of rail spray wind is quickly forced to cool down, air nozzle
Apart from tread 45mm, wind blast 0.19MPa, compressed air cooling section rail joint weld seam tread t are sprayed8/5Cooling velocity is in 2.5 DEG C/s；
Stop compressed air cooling immediately after joint Heating Zone Temperature is forced and is cooled to 410 DEG C of final cooling temperature, 136RE SS can be avoided hot
Handle the precipitation of the rail head martensitic structure of rail joint, rail head weld impingement work(Aku>=more than 12J, tunneling boring weld impingement work(
Aku>=more than 10J, the air-cooled region tread longitudinal direction hardness of joint welding reach the 90%-102% of mother metal, and softening sector width is less than
20mm。
Fig. 1 is the vertical section low power sample of the Post-Welding Heattreatment of Rail joint in the present embodiment, and Fig. 2 is rail in the present embodiment
Vertical section hardness distribution at tread 5.0mm after welding point heat treatment.Hardness distribution is using cloth dimension hardometer (Shandong Lay
State city testing machine head factory, model HBV-30A) to be tested by interval of 5mm, obtained data are mapped using EXCLE.
In Fig. 2 as can be seen that on the basis of the center of weld seam, on the left of 136RE SS heat-treated rail post weld heat treatment joint
Softening sector width is 13.5mm, and right side softening sector width is 15.0mm, meets to soften the requirement that sector width is less than 20mm in iron mark.
Embodiment 2
In WELDING JOINT PWHT procedures, when joint uses Medium frequency induction fast electric heated weld seam line regions
To 735 DEG C of Ac3 temperature+~more than 200 DEG C of 920 DEG C of peak temperature, include both sides outside heating zone to heating zone immediately and grow
The rail head of rail tread spent in the range of 60mm and side, and rail bottom center carry out compressed air cooling.It is best that cold temperature is opened in control
To stop 840 DEG C after heating, immediately begin to carry out rail head tread and flange of rail spray wind is quickly forced to cool down, air nozzle is apart from tread
45mm, spray wind blast 0.23MPa, compressed air cooling section rail joint weld seam tread t8/5Cooling velocity is in 2.8 DEG C/s；When joint plus
Hot zone temperature is forced to stop compressed air cooling immediately after being cooled to 420 DEG C of final cooling temperature, can avoid 136RE SS heat-treated rails
The precipitation of the rail head martensitic structure of joint, rail head weld impingement work(Aku>=more than 12J, tunneling boring weld impingement work(Aku≥10J
More than, the air-cooled region tread longitudinal direction hardness of joint welding reaches the 90%-102% of mother metal, and softening sector width is less than 20mm.
The tensile property of 136RE SS heat-treated rails post weld heat treatment joint is listed in Table 1 below in the present embodiment.
Embodiment 3
In WELDING JOINT PWHT procedures, when joint uses Medium frequency induction fast electric heated weld seam line regions
To 735 DEG C of Ac3 temperature+~more than 200 DEG C of 900 DEG C of peak temperature, include both sides outside heating zone to heating zone immediately and grow
The rail head of rail tread spent in the range of 50mm and side, and rail bottom center carry out compressed air cooling.It is best that cold temperature is opened in control
To stop 830 DEG C after heating, immediately begin to carry out rail head tread and flange of rail spray wind is quickly forced to cool down, air nozzle is apart from tread
50mm, spray wind blast 0.25MPa, compressed air cooling section rail joint weld seam tread t8/5Cooling velocity is in 2.7 DEG C/s；When joint plus
Hot zone temperature is forced to stop compressed air cooling immediately after being cooled to 440 DEG C of final cooling temperature, can avoid 136RE SS heat-treated rails
The precipitation of the rail head martensitic structure of joint, rail head weld impingement work(Aku>=more than 12J, tunneling boring weld impingement work(Aku≥10J
More than, the air-cooled region tread longitudinal direction hardness of joint welding reaches the 90%-102% of mother metal, and softening sector width is less than 20mm.
The impact property of 136RE SS heat-treated rails post weld heat treatment joint is listed in Table 1 below in the present embodiment.
The impact property of the heat treatment joint of the embodiment 2 and 3 of table 1
Embodiment 4
In WELDING JOINT PWHT procedures, when joint uses Medium frequency induction fast electric heated weld seam line regions
To 735 DEG C of Ac3 temperature+~more than 200 DEG C of 910 DEG C of peak temperature, include both sides outside heating zone to heating zone immediately and grow
The rail head of rail tread spent in the range of 55mm and side, and rail bottom center carry out compressed air cooling.It is best that cold temperature is opened in control
To stop 800 DEG C after heating, immediately begin to carry out rail head tread and flange of rail spray wind is quickly forced to cool down, air nozzle is apart from tread
30mm, spray wind blast 0.10MPa, compressed air cooling section rail joint weld seam tread t8/5Cooling velocity is in 2.2 DEG C/s；When joint plus
Hot zone temperature is forced to stop compressed air cooling immediately after being cooled to 420 DEG C of final cooling temperature, can avoid 136RE SS heat-treated rails
The precipitation of the rail head martensitic structure of joint, rail head weld impingement work(Aku>=more than 12J, tunneling boring weld impingement work(Aku≥10J
More than, the air-cooled region tread longitudinal direction hardness of joint welding reaches the 90%-102% of mother metal, and softening sector width is less than 20mm.
Fig. 3 is the microscopic structure of the Post-Welding Heattreatment of Rail joint in this example.Including rail head, the web of the rail and the flange of rail
136RE SS heat-treated rail post weld heat treatment joint martensite-free tissues.
It is several comparative examples below as the Contrast on effect with previous embodiment.
Comparative example 1
After rail flash welding is completed, post weld heat treatment of the present invention is not done, and joint is stood and is cooled to room temperature.
Wherein, peak temperature during welding is 1280 DEG C, and room temperature refers to 0-45 DEG C.
The tensile property of 136RE SS heat-treated rails postwelding air cooling joint is listed in Table 2 below in the present embodiment.
Comparative example 2
After rail flash welding is completed, post weld heat treatment of the present invention is not done, and joint is stood and is cooled to room temperature.
Wherein, peak temperature during welding is 1310 DEG C, and room temperature refers to 0-45 DEG C.
The impact property of 136RE SS heat-treated rails postwelding air cooling joint is listed in Table 2 below in the present embodiment.It can not meet
AKU>=6.5J requirement.
The impact property of the heat treatment joint of the comparative example 1 of table 2 and comparative example 2
Comparative example 3
After rail flash welding is completed, post weld heat treatment of the present invention is not done, and joint is stood and is cooled to room temperature.
Wherein, peak temperature during welding is 1290 DEG C, and room temperature refers to 0-45 DEG C.
Fig. 4 is the microscopic structure of the rail postwelding air cooling joint in comparative example.Including rail head, the web of the rail and the flange of rail
There is martensitic structure in 136RE SS heat-treated rail postwelding air cooling joints.
Comparative example 4
In WELDING JOINT PWHT procedures, when joint uses Medium frequency induction fast electric heated weld seam line regions
To 735 DEG C of Ac3 temperature+~more than 200 DEG C of 940 DEG C of peak temperature, include both sides outside heating zone to heating zone immediately and grow
The rail head of rail tread spent in the range of 60mm and side, and rail bottom center carry out compressed air cooling.It is best that cold temperature is opened in control
To stop 830 DEG C after heating, immediately begin to carry out rail head tread and flange of rail spray wind is quickly forced to cool down, air nozzle is apart from tread
48mm, wind blast 0.35MPa is sprayed, compressed air cooling section rail joint weld seam tread t8/5 cooling velocities are in 6.2 DEG C/s；When joint plus
Hot zone temperature is forced to be cooled to the method for stopping compressed air cooling after 380 DEG C of final cooling temperature immediately.
Fig. 5 is the microscopic structure of the Post-Welding Heattreatment of Rail joint in this contrast.Including rail head, the web of the rail and the flange of rail
There is martensitic structure in 136RE SS heat-treated rail post weld heat treatment joints.
It can be seen that using technical scheme, successfully can enter 136RE SS rail from the result of embodiment
The mobile Flash Butt Welding of row, the internal flaw of rail joint is few, welding quality stable, can pass through fatigue test, stretching and impact
The test of experiment and quiet curved experiment meets to require；Rail joint can continue through 15 flash welding joints and drop hammer inspection, tool
There is preferable stability.And comparative example 1, comparative example 2, comparative example 3 and the comparative example 4 of technical solution of the present invention are not used, welding
Rail joint afterwards can not be examined by dropping hammer, and be unsatisfactory for requiring.
Claims (10)
- The post weld heat treatment method of 1.136RE+SS heat-treated rail welding points, it is characterised in that：Including following steps：A, more than heated weld seam line regions to Ac3 critical-temperatures 860 DEG C -940 DEG C of peak temperature；B, heating region is quickly cooled down, cooling velocity control will be made in 2.0 DEG C/s-3.5 DEG C/s；C, when it is 400 DEG C -470 DEG C that weld seam wheel tread temperature, which is down to final cooling temperature, quick cooling is stopped；D, Welded Joints carry out naturally cooling to room temperature.
- 2. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 1, it is characterised in that： Have in step A using intermediate frequency or oxyacetylene torch heated weld seam line regions.
- 3. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 1, it is characterised in that： Have in step B using spray wind method for rapid cooling, heating region is quickly cooled down.
- 4. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 3, it is characterised in that： In step B Welded Joints tread heating zone carry out spray wind quickly cool down.
- 5. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 3, it is characterised in that： The rail head of rail tread outside Welded Joints heating zone in the range of two side length 50mm-60mm and side in step B, and rail Bottom center carries out spray wind and quickly cooled down.
- 6. the post weld heat treatment method of the 136RE+SS heat-treated rail welding points as described in claim 4 or 5, its feature exist In：Air nozzle is apart from tread 20mm-70mm in step B.
- 7. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 3, it is characterised in that： It is 0.10MPa-0.50MPa that wind blast is sprayed in step B.
- 8. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 3, it is characterised in that： In step B Welded Joints tread heating zone carry out spray wind quickly cool down.
- 9. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 1, it is characterised in that： Spray wind is carried out using air-jet device quickly to cool down.
- 10. the post weld heat treatment method of 136RE+SS heat-treated rails welding point as claimed in claim 1, its feature exist In：Using infrared radiation thermometer automatic data collection and monitoring wheel tread temperature.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108103299A (en) * | 2018-01-28 | 2018-06-01 | 合肥市瑞宏重型机械有限公司 | Heat treatment process after full length quenching steel rail welding |
| CN109022748A (en) * | 2018-10-24 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The heat treatment method of U71MnH steel rail weld joint |
| CN109022746A (en) * | 2018-10-24 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The heat treatment method of U71MnH rail flash welding connector |
| CN109022749A (en) * | 2018-10-24 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The post weld heat treatment method of U71MnH steel rail weld joint |
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| CN108103299A (en) * | 2018-01-28 | 2018-06-01 | 合肥市瑞宏重型机械有限公司 | Heat treatment process after full length quenching steel rail welding |
| CN109022746B (en) * | 2018-10-24 | 2020-05-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Heat treatment method of U71MnH steel rail flash welding joint |
| CN109022746A (en) * | 2018-10-24 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The heat treatment method of U71MnH rail flash welding connector |
| CN109022749A (en) * | 2018-10-24 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The post weld heat treatment method of U71MnH steel rail weld joint |
| CN109022747A (en) * | 2018-10-24 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The post weld heat treatment method of U71MnH rail flash welding connector |
| CN109022748A (en) * | 2018-10-24 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The heat treatment method of U71MnH steel rail weld joint |
| CN109022749B (en) * | 2018-10-24 | 2020-06-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Postweld heat treatment method for U71MnH steel rail welding joint |
| CN109355481A (en) * | 2018-10-26 | 2019-02-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Groove-shape rail flash welding connector post weld heat treatment method |
| CN111363897A (en) * | 2020-04-23 | 2020-07-03 | 中国铁建重工集团股份有限公司 | Heat treatment method for welded joint of dissimilar material steel rail |
| CN111363897B (en) * | 2020-04-23 | 2021-11-02 | 中国铁建重工集团股份有限公司 | Heat treatment method for welded joint of dissimilar material steel rail |
| CN113416833A (en) * | 2021-07-08 | 2021-09-21 | 包钢中铁轨道有限责任公司 | Steel rail weld heat treatment control system and heat treatment method |
| CN113416833B (en) * | 2021-07-08 | 2022-06-10 | 包钢中铁轨道有限责任公司 | Steel rail weld heat treatment control system and heat treatment method |
| CN115287442A (en) * | 2022-08-25 | 2022-11-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Postweld heat treatment method for high-carbon microalloyed steel rail |
| CN115287442B (en) * | 2022-08-25 | 2024-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Postweld heat treatment method for high-carbon microalloyed steel rail |
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