CN109022747A - The post weld heat treatment method of U71MnH rail flash welding connector - Google Patents
The post weld heat treatment method of U71MnH rail flash welding connector Download PDFInfo
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- CN109022747A CN109022747A CN201811244438.9A CN201811244438A CN109022747A CN 109022747 A CN109022747 A CN 109022747A CN 201811244438 A CN201811244438 A CN 201811244438A CN 109022747 A CN109022747 A CN 109022747A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to the post weld heat treatment methods of U71MnH rail flash welding connector, belong to rail welding technique field.The present invention in order to solve existing steel rail weld joint during heat treatment cool down when because local cooling rate be higher than critical transition temperature, and leading to the problem of the adverse tissues such as martensite influences connector hardness, provide a kind of post weld heat treatment method of U71MnH rail flash welding connector, this method is: being cooled to postwelding and stops heating after 300 DEG C of U71MnH steel rail weld joint welded seam areas below are heated to 919-940 DEG C, using compressed air cooling, stop compressed air cooling, cooled to room temperature after rail joint wheel tread temperature is down to 410-435 DEG C.While effectively controlling the hardness of U71MnH steel rail weld joint using the method for the present invention, it ensure that joint microstructure is normal.
Description
Technical field
The invention belongs to rail welding technique fields, and in particular to the post weld heat treatment of U71MnH rail flash welding connector
Method.
Background technique
Rail welding has that heating temperature is high, heating speed is fast, high-temperature residence time is short, temperature distribution is non-uniform and in sky
Under cool condition the features such as continuous coo1ing, be easy to appear organizational coarseness in connector especially heat affected area, in addition easily formed martensite,
The adverse tissues such as bainite make joint phenomena such as hardening, embrittlement occur；Postwelding connector generates internal stress simultaneously, in complexity
External stress effect under, be easily broken, become the weak link of railroad embankment.To discharge stress, crystal grain is refined, is changed
Joint microstructure form improves lowered performance state, need to carry out post weld heat treatment to rail joint.
Patent document CN108103299A discloses a kind of heat treatment process after full length quenching steel rail welding, which will be portable
The wind pressure of formula hardening of rails device, which is adjusted to 0.8~1.0Mpa, water is adjusted to 15~20ml/s and reaches atomization requires, and works as welding
When connector temperature drops to 400 ± 10 DEG C, with oxy arc heat welding point 3~5 minutes, measurement connector temperature reach 900 DEG C ±
At 10 DEG C, heat preservation keeps connector temperature balanced, spraying using Portable rail quenching device when temperature reaches 800 DEG C ± 10 DEG C,
Spray time is ± 10 seconds 100 seconds, is finished by spraying, natural cooling, and when temperature drops to 400 DEG C ± 10 DEG C, integer of polishing is visited
Wound, detects rail and detection tabs meet the requirements.The technique solves the smoothness of rail by heat treatment method, makes rail
Can be with indefinite length, but the hardness of non-Welded Joints makes a search；Technique Welded Joints by the way of spraying simultaneously
It is cooled down, if atomizing effect is not up to standard, makes the water droplet in cooling medium containing larger particles, keep rail joint surface locally cold
Speed is higher than critical transition temperature, and then generates the adverse tissues such as martensite in the region, and there are excessively high risks for connector hardness.
Xu Xin etc. (railway construction, 2016 (08): 145-148) is welded using novel load coil Welded Joints
After be heat-treated, 880 ± 10 DEG C of heating temperature；Heating time > 130s；0.06~0.10MPa of wind pressure；Spray wind time 150s.It uses
After novel load coil carries out post weld heat treatment under above-mentioned technological parameter, connector tyre tread and the ratio of base material hardness are
1.01, rail head, rail bottom trigonum and 2 rail bottom angle crystal grain are refined, and grain size number is up to 9 grades or more.But its research pair
As for U71Mn hot rolled rail, this method is not suitable for U17MnH rail.
Summary of the invention
The present invention produces to solve steel rail weld joint in cooling procedure because local cooling rate is higher than critical transition temperature
The adverse tissues such as raw martensite make welding point lower hardness.
The technical solution used to solve the technical problems of the present invention is that providing the weldering of U71MnH rail flash welding connector
Heat treatment method afterwards.This method comprises the following steps: being cooled to 300 DEG C of U71MnH steel rail weld joint weld seams below to postwelding
Region stops heating after being heated to 919-940 DEG C, using compressed air cooling, after rail joint wheel tread temperature is down to 410-435 DEG C
Stop compressed air cooling, cooled to room temperature.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, U71MnH rail welding is connect
Head welded seam area heating method is heated using Medium frequency induction electric heating or oxyacetylene torch.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the U71MnH rail weldering
The control of joint welding region heating time is connect in 135-250s.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the compressed air cooling is risen
Beginning connector wheel tread temperature is controlled at 720-810 DEG C.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the spray of the compressed air cooling
Air port is apart from 30 ± 2mm of rail joint surface.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the spray wind wind pressure is
0.15±0.05MPa。
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the rail joint weld seam
Region refers to the region in each 20mm in melt run two sides.
The beneficial effects of the present invention are:
The method of the present invention improves U71MnH steel rail weld joint by control heating temperature, spray wind wind pressure and final cooling temperature
Hardness, ratio >=0.90 of the hardness average value HJ and base material hardness average value HP of connector；Connector soft spots hardness average value
Ratio >=0.80 of HJ1 and base material hardness average value HP；Softened region is less than 20mm, meets standard requirements.The method of the present invention has
While effect control rail joint hardness, it ensure that rail joint tissue morphology is normal, improve lowered performance state.This
Inventive method has good popularization and application foreground, can the welding base of heavy-haul line rail or online welding procedure list at home
It promotes the use of position.
Detailed description of the invention
The hardness curve that Fig. 1 is 5mm under 60kg/mU71MnH Post-Welding Heattreatment of Rail rail head tyre tread in embodiment 1.
The hardness curve that Fig. 2 is 5mm under 60kg/mU71MnH Post-Welding Heattreatment of Rail rail head tyre tread in embodiment 2.
The hardness curve that Fig. 3 is 5mm under 60kg/mU71MnH Post-Welding Heattreatment of Rail rail head tyre tread in embodiment 3.
The hardness curve that Fig. 4 is 5mm under 60kg/mU71MnH Post-Welding Heattreatment of Rail rail head tyre tread in embodiment 4.
The hardness curve that Fig. 5 is 5mm under 60kg/mU71MnH Post-Welding Heattreatment of Rail rail head tyre tread in comparative example.
Specific embodiment
The present invention provides the post weld heat treatment methods of U71MnH rail flash welding connector.This method includes following step
It is rapid: to postwelding be cooled to 300 DEG C it is below 919-940 DEG C is heated to U71MnH steel rail weld joint welded seam area after stop plus
Heat stops compressed air cooling, cooled to room temperature after rail joint wheel tread temperature is down to 410-435 DEG C using compressed air cooling.
In the present invention, 300 DEG C of U71MnH steel rail weld joint welded seam areas below are cooled to postwelding and are heated to 919-
Stop heating after 940 DEG C, then cooling while use normalizing process and effectively control rail joint hardness, releases connector and answer
Power refines connector crystal grain, changes joint microstructure form, improves lowered performance state.When rail head of rail surface reaches requirement
When range, it cannot be guaranteed that especially center portion temperature can also reach requirement temperature inside rail, in order to guarantee that center portion temperature can reach
To temperature is required, temperature cannot be too low；When the temperature is excessively high, on the one hand, temperature is surveyed than practical at relatively thin rail rail bottom
Amount temperature is higher, and there are the risk of tissue overheating, on the other hand, heating coil is the source of heat, using its as center heat to
Rail both ends heat transfer, heat affected area width can broaden, or even be unsatisfactory for standard requirements.
In the present invention, final cooling temperature should be controlled at 420-470 DEG C.Final cooling temperature is excessively high, and hardness requirement is not achieved；Cold temperature eventually
It spends low, entire rail joint tissue can be made to be abnormal.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, U71MnH rail welding is connect
Head welded seam area heating method is heated using Medium frequency induction electric heating or oxyacetylene torch.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the U71MnH rail weldering
The control of joint welding region heating time is connect in 135-250s.For the uniformity coefficient for keeping rail tunneling boring heated, heating
Needing control heating time in the process is 135-250s, if heating time is too short, actual transformation region only has rail surface layer, in rail
Portion's tissue cannot be promoted；If heating time is too long, there is the risk of overheat in rail joint, will affect joint microstructure, while can
Rail joint softened region can be made exceeded.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the compressed air cooling is risen
Beginning connector wheel tread temperature is controlled at 720-810 DEG C.In order to control the hardness of rail joint softened zone, starting spray air temperature needs to control
System is within the above range.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the spray of the compressed air cooling
Air port is apart from 30 ± 2mm of rail joint surface.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the spray wind wind pressure is
0.15±0.05MPa.It is too high or too low to spray wind wind pressure, can all influence cooling rate, cause hardness not up to standard.
Wherein, in the post weld heat treatment method of above-mentioned U71MnH rail flash welding connector, the rail joint weld seam
Region refers to the region in each 20mm in melt run two sides.
Refer at rail joint in the present invention using melt run as the region in each 100mm in center two sides.
Embodiment 1
Stop after being heated to 940 DEG C to 60kg/m U71MnH steel rail weld joint welded seam area using heating in medium frequency mode
Heating, heating time 145s.After stopping heating, when rail joint wheel tread temperature is down to 810 DEG C, compressed air cooling, spray are carried out
Apart from rail joint surface 30mm, spray wind wind pressure is 0.15 ± 0.05MPa in air port, is down to cold temperature eventually when connector wheel tread temperature is air-cooled
When degree is 435 DEG C, stop compressed air cooling, subsequent rail joint carries out cooled to room temperature.Referring to TB/T 1632.2-2014
Standard requirements, using 5mm Rockwell hardness under rail head tyre tread on HR-150A Rockwell apparatus test vertical section.In the present embodiment
The ratio of the hardness average value HJ and base material hardness average value HP of 60kg/m U71MnH Post-Welding Heattreatment of Rail connector are 0.98,
The ratio of connector soft spots hardness average value HJ1 and base material hardness average value HP is 0.88, and softening sector width is on the left of connector
13.5mm, it is 8.0mm that right side, which softens sector width, meets standard requirements.
Embodiment 2
Stop after being heated to 919 DEG C to 60kg/m U71MnH steel rail weld joint welded seam area using heating in medium frequency mode
Heating, heating time 138s.After stopping heating, when rail joint wheel tread temperature is down to 785 DEG C, compressed air cooling, spray are carried out
Apart from rail joint surface 30mm, spray wind wind pressure is 0.15 ± 0.05MPa in air port, is down to cold temperature eventually when connector wheel tread temperature is air-cooled
When degree is 410 DEG C, stop compressed air cooling, subsequent rail joint carries out cooled to room temperature.Referring to TB/T 1632.2-2014
Standard requirements, using 5mm Rockwell hardness under rail head tyre tread on HR-150A Rockwell apparatus test vertical section.In the present embodiment
The ratio of the hardness average value HJ and base material hardness average value HP of 60kg/m U71MnH Post-Welding Heattreatment of Rail connector are 0.95,
The ratio of connector soft spots hardness average value HJ1 and base material hardness average value HP is 0.83, and softening sector width is on the left of connector
12.5mm, it is 12.5mm that right side, which softens sector width, meets standard requirements.
Embodiment 3
Stop after being heated to 921 DEG C to 60kg/m U71MnH steel rail weld joint welded seam area using heating in medium frequency mode
Heating, heating time 136s.After stopping heating, when rail joint wheel tread temperature is down to 800 DEG C, compressed air cooling, spray are carried out
Apart from rail joint surface 30mm, spray wind wind pressure is 0.15 ± 0.05MPa in air port, is down to cold temperature eventually when connector wheel tread temperature is air-cooled
When degree is 435 DEG C, stop compressed air cooling, subsequent rail joint carries out cooled to room temperature.Referring to TB/T 1632.2-2014
Standard requirements, using 5mm Rockwell hardness under rail head tyre tread on HR-150A Rockwell apparatus test vertical section.In the present embodiment
The ratio of the hardness average value HJ and base material hardness average value HP of 60kg/m U71MnH Post-Welding Heattreatment of Rail connector are 0.91,
The ratio of connector soft spots hardness average value HJ1 and base material hardness average value HP is 0.80, and softening sector width is on the left of connector
14.5mm, it is 18.0mm that right side, which softens sector width, meets standard requirements.
Embodiment 4
919 DEG C are heated to 60kg/m U71MnH steel rail weld joint welded seam area using oxyacetylene torch heating method
Stop heating afterwards, the pressure of oxygen is 0.6MPa, flow 4.8m3/ h, the pressure of acetylene are 0.2MPa, flow 4.0m3/ h,
Heating time is 250s.Stop heating after, when rail joint wheel tread temperature is down to 720 DEG C, carry out compressed air cooling, air nozzle away from
From rail joint surface 30mm, spray wind wind pressure is 0.15 ± 0.05MPa, when the air-cooled final cooling temperature of being down to of connector wheel tread temperature is
At 429 DEG C, stop compressed air cooling, subsequent rail joint carries out cooled to room temperature.Referring to TB/T 1632.2-2014 standard
It is required that using 5mm Rockwell hardness under rail head tyre tread on HR-150A Rockwell apparatus test vertical section.60kg/m in the present embodiment
The ratio of the hardness average value HJ and base material hardness average value HP of U71MnH Post-Welding Heattreatment of Rail connector are 0.91, connector soft spots
The ratio of hardness average value HJ1 and base material hardness average value HP is 0.80, and softening sector width is 19.0mm on the left of connector, and right side is soft
Change sector width is 17.0mm, meets standard requirements.
Comparative example
Stop after being heated to 842 DEG C to 60kg/m U71MnH steel rail weld joint welded seam area using heating in medium frequency mode
Heating, heating time 87s after stopping heating, when rail joint wheel tread temperature is down to 715 DEG C, carry out compressed air cooling, spray wind
Mouth is 0.15 ± 0.05MPa apart from rail joint surface 30mm, spray wind wind pressure, is down to final cooling temperature when connector wheel tread temperature is air-cooled
When being 431 DEG C, stop compressed air cooling, subsequent rail joint carries out cooled to room temperature.It is marked referring to TB/T 1632.2-2014
Alignment request, using 5mm Rockwell hardness under rail head tyre tread on HR-150A Rockwell apparatus test vertical section.60kg/ in the present embodiment
The ratio of the hardness average value HJ and base material hardness average value HP of m U71MnH Post-Welding Heattreatment of Rail connector are 0.74, and connector is soft
The ratio of point hardness average value HJ1 and base material hardness average value HP is 0.74, and softening sector width is 30.0mm, right side on the left of connector
Softening sector width is 25.0mm, is unsatisfactory for standard requirements.
By embodiment 1-4 it is found that being heat-treated using the method for the present invention to U71MnH steel rail weld joint, processing is followed by
Ratio >=0.90 of the hardness average value HJ and base material hardness average value HP of head；Connector soft spots hardness average value HJ1 and base material are hard
Spend ratio >=0.80 of average value HP；The softened region of left and right side is less than 20mm, meets standard requirements.And comparative example is not adopted
With the method for the present invention to the ratio of the hardness average value HJ and base material hardness average value HP of the rail joint of U71MnH heat-treatment of rail
Value is 0.74, and the ratio of connector soft spots hardness average value HJ1 and base material hardness average value HP are 0.74, and softened zone is wide on the left of connector
Degree is 30.0mm, and it is 25.0mm that right side, which softens sector width, is unsatisfactory for standard requirements.
Claims (7)
- The post weld heat treatment method of 1.U71MnH rail flash welding connector, it is characterised in that: 300 DEG C or less are cooled to postwelding U71MnH steel rail weld joint welded seam area be heated to 919-940 DEG C after stop heating, using compressed air cooling, to rail joint Wheel tread temperature stops compressed air cooling, cooled to room temperature after being down to 410-435 DEG C.
- 2. the post weld heat treatment method of U71MnH rail flash welding connector according to claim 1, it is characterised in that: U71MnH steel rail weld joint welded seam area heating method is heated using Medium frequency induction electric heating or oxyacetylene torch.
- 3. the post weld heat treatment method of U71MnH rail flash welding connector according to claim 1 or 2, feature exist In: the U71MnH steel rail weld joint welded seam area heating time control is in 135-250s.
- 4. the post weld heat treatment method of U71MnH rail flash welding connector according to claim 1-3, special Sign is: the starting connector wheel tread temperature of the compressed air cooling is controlled at 720-810 DEG C.
- 5. the post weld heat treatment method of U71MnH rail flash welding connector according to claim 1-4, special Sign is: the air nozzle of the compressed air cooling is apart from 30 ± 2mm of rail joint surface.
- 6. the post weld heat treatment method of U71MnH rail flash welding connector according to claim 1-5, special Sign is: the spray wind wind pressure is 0.15 ± 0.05MPa.
- 7. the post weld heat treatment method of U71MnH rail flash welding connector according to claim 1-6, special Sign is: the rail joint welded seam area refers to the region in each 20mm in melt run two sides.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110257620A (en) * | 2019-07-30 | 2019-09-20 | 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 |
| CN110295274A (en) * | 2019-07-30 | 2019-10-01 | 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 |
| CN110306032A (en) * | 2019-07-30 | 2019-10-08 | 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 |
| CN110343841A (en) * | 2019-07-30 | 2019-10-18 | 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 |
| 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 |
| CN115287441A (en) * | 2022-07-31 | 2022-11-04 | 包头钢铁（集团）有限责任公司 | Postweld heat treatment method for U71MnG high-speed steel rail welded joint |
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| CN110343841A (en) * | 2019-07-30 | 2019-10-18 | 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 |
| 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 |
| CN115287441A (en) * | 2022-07-31 | 2022-11-04 | 包头钢铁（集团）有限责任公司 | Postweld heat treatment method for U71MnG high-speed steel rail welded joint |
| CN115287441B (en) * | 2022-07-31 | 2024-04-30 | 包头钢铁（集团）有限责任公司 | Post-welding heat treatment method for U71MnG high-speed steel rail welding joint |
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