CN110512149A - A method of control R260 WELDING JOINT martensitic structure - Google Patents
A method of control R260 WELDING JOINT martensitic structure Download PDFInfo
- Publication number
- CN110512149A CN110512149A CN201910701635.7A CN201910701635A CN110512149A CN 110512149 A CN110512149 A CN 110512149A CN 201910701635 A CN201910701635 A CN 201910701635A CN 110512149 A CN110512149 A CN 110512149A
- Authority
- CN
- China
- Prior art keywords
- welding
- rail
- control
- martensitic structure
- controlling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/04—Flash butt welding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
Abstract
The present invention relates to a kind of methods for controlling R260 WELDING JOINT martensitic structure, belong to railway track welding technology field.Present invention solves the technical problem that being that R260 WELDING JOINT postwelding is air-cooled is easy to appear martensitic structure.The technical scheme is that a kind of method for controlling R260 WELDING JOINT martensitic structure, it is controlled including hot rolling technology, welding procedure control, the cooling control of postwelding, wherein control R260 rail base material Mn content is that 0.80%~0.90%, C content is in lower limit, Si≤0.30%, and 0.05%~0.10%Cr, 0.01%~0.03%V are added in molten steel in steelmaking process.The present invention can avoid the inspection position as defined in rail head median plane and rail bottom foot and martensitic structure occurs, ensure that connector items mechanical performance index, meets the technical requirements of EN14587-2:2009 standard, has good popularization and application foreground.
Description
Technical field
The invention belongs to railway track welding technology fields, and in particular to a kind of control R260 WELDING JOINT geneva
The method of body tissue.
Background technique
EN R260 rail is to climb steel one of steel grade most to the countries in Southeast Asia such as Malaysia, Thailand export volume every year,
Ten thousand tons of 2-4 or so are about exported every year.EN13674-1:2011"Railway applications-Track-RailPart 1:
Vignole railway rails 46kg/mand above " standard requirements production R260 finished product rail chemical component
Are as follows: 0.60%~0.82%C, 0.65%~1.25%Mn, 0.13%~0.60%Si, P, S≤0.030% ,≤0.15%
Cr ,≤0.030%V, remaining Mo, Ni, Cu, Sn, Pb etc. are control element, the control of general content requirement 0.02%~
0.15%.Meanwhile EN standard requirements R260 mechanics property of rail tensile strength Rm >=880MPa, elongation after fracture A >=10%,
260~300HB of tyre tread hardness.
Rail Production quotient meets standard requirements for the intensity and tyre tread hardness that guarantee R260 rail, and most economical method is
Mn content is promoted to middle upper range, to guarantee after normal rolling that rail meets EN standard under the conditions of air-cooled: Rm >=
880MPa, the technical requirements of 260~300HB of tyre tread hardness.However, C, Mn be segregation element, when in rail Mn content improve to
After middle upper range, the rail base material of high Mn ingredient certainly will cause Mn microcell to be segregated, and the chemical component of line of segragation high-content makes CCT
Curve seriously moves to right, and is particularly easy to cause dotted martensitic structure occur in postwelding connector process air cooler, can not pass through EN standard
Solder type inspection.
Summary of the invention
Present invention solves the technical problem that being that R260 WELDING JOINT postwelding is air-cooled is easy to appear martensitic structure.
The technical solution that the present invention solves above-mentioned technical problem is to provide a kind of control R260 WELDING JOINT geneva
The method of body tissue, step include: R260 rail base material chemical Composition Control, hot rolling technology control, welding procedure control, postwelding
Cooling control, wherein Mn content is during 0.80%~0.90%, C content is in control R260 rail base material by weight percentage
0.05%~0.10%Cr, 0.01%~0.03%V are added in steelmaking process in molten steel for lower limit, Si≤0.30%.
Wherein, hot rolling technology control, which makes to roll mechanics property of rail, meets Rm >=880MPa, tyre tread hardness >=260HB.
Further, hot rolling technology carries out hot rolling using universal rolling production line.
Wherein, the cooling control of postwelding is to be air-cooled to room temperature after the completion of connector pushes away tumor.
Wherein, welding procedure control welding upset amount is maintained at 14.0~15.0mm.
Further, welding procedure is using the high heat-input amount pulsation of 8.5~9.5MJ or preheating flash butt welding.
The beneficial effects of the present invention are:
The present invention is made by the comprehensively control cooling to R260 rail chemical component, hot rolling technology, welding procedure, postwelding
R260 rail ingredient Mn content is obtained in the case where 0.80%~0.90%, flash welding connector can avoid in rail head median plane
There is martensitic structure with inspection position as defined in rail bottom foot, ensure that connector items mechanical performance index, meet EN 14587-
The technical requirements of 2:2009 standard；The present invention controls simple process, can mating solution EN R260 rail promotion and application road
On great welding technique problem, have good popularization and application foreground.
Detailed description of the invention
Fig. 1 is microscopic structure check position schematic diagram as defined in EN 14587-2:2009 standard, wherein 1,2 is micro- group
Knit check position；
Fig. 2 is 1 connector metallographic structure figure of the embodiment of the present invention.
Specific embodiment
The rail welding method and test stone of the standard requirements such as external EN, AREMA are different from Chinese T B/T1632-
The standard of 2014 rail weldings series.The maximum difference of welding method is that postwelding does not use the air-cooled technique of postwelding normalizing to carry out
Connector post weld heat treatment, and generally use postwelding air-cooled or air quenching technique.It is generally adopted before R260 rail in foreign countries
It is welded and is checked and accepted with AS standard, but require to check and accept in strict accordance with EN 14587-2:2009 standard in recent years.Especially EN
14587-2:2009《Rail way applications-Track-Flash butt welding of rails.Part 2:
New R220 R260 R260Mn and R350HT grade rails by mobile welding machines at
Sites other than a fixed plant " standard regulation check the air-cooled connector tyre tread of R260 flash welding in rail under 0mm~
The microscopic structure of 20mm vertical central plane position is as shown in Figure 1.Rail vertical central plane is the center crystal plane of continuous casting steel billet, is
C, the element segregations such as Mn are enriched with region the most serious.
The present invention provides a kind of method for controlling R260 WELDING JOINT martensitic structure, and step includes: R260 steel
Rail base material chemical Composition Control, hot rolling technology control, welding procedure control, the cooling control of postwelding, wherein control R260 rail is female
Mn content is that 0.80%~0.90%, C content is in lower limit, Si≤0.30% to material by weight percentage, in steelmaking process
0.05%~0.10%Cr, 0.01%~0.03%V are added in molten steel.C content be in lower limit general control 0.70~
Between 0.75%.
Wherein, hot rolling technology control, which makes to roll mechanics property of rail, meets Rm >=880MPa, tyre tread hardness >=260HB.This hair
Conventional hot rolling technique can be used in the bright hot rolling technology carried out to rail base material, make after hot rolling mechanics property of rail meet Rm >=
880MPa, tyre tread hardness >=260HB.Preferably, hot rolling technology carries out hot rolling using universal rolling production line.
Wherein, welding procedure control welding upset amount is maintained at 14.0~15.0mm.The present invention enters after hot rolling
Welding procedure controls the stage, wherein having carried out special control to upset amount, because upset amount is too small, weld seam is net in the presence of not extracting
Oxide reduces joint performance；Excessive upset amount leads to cold junction, and performance equally reduces.It needs in practice operation by big
Quiet curved or stretching experiment is measured to confirm optimal upset amount.
Specifically, the present invention is using the mobile flash welder of rail or fixes flash welder, using the big heat of 8.5~9.5MJ
Input quantity pulsation or preheating flash butt welding connect.Heat input is bigger, and connector postwelding cooling velocity is slower, is conducive to mitigation and geneva occurs
The area percentage content of body tissue.
Wherein, the cooling control of postwelding is to be air-cooled to room temperature after the completion of connector pushes away tumor.
The present invention is further illustrated by the following examples.
In the present invention, it is described welding " connector " be obtain after weld formation include weld seam including length be 70~110mm
The region of range, the center in the region are steel rail welding line.The present invention relates to connector temperature be welding point rail head surface layer
Temperature namely rail head wheel tread temperature are acquired temperature signal using infrared radiation thermometer, and the rail head of rail tyre tread is wheel
With the contact portion of rail.Length including tunneling boring refers to comprising weld seam is about that rail welding within the scope of 70~110mm connects
Head whole cross section, including rail head, the web of the rail, rail bottom.
Metallographic structure is carried out to rail joint metallographic specimen by GB/T13298-2015 " the metal microstructure method of inspection "
It examines, etch is carried out to rail joint metallographic specimen using 3% nital, using Leca MeF3 optical microscopy
Rail joint metallographic structure is observed.The quiet curved load of connector, amount of deflection, microscopic structure check position are according to EN 14587-
2:2009 standard carries out.
Embodiment 1
Mn content in R260 rail base material composition is controlled to be in 0.80% in limited time, during other chemical component C contents are in
Lower limit and when Si is maintained at≤0.30%, needs to be added 0.10%Cr and 0.02%V in molten steel in steelmaking process, omnipotent
The hot rolled rail mechanical property that line normally produces rolling meets Rm >=880MPa, when tyre tread hardness >=260HB, utilizes rail mobile
Flash welder or fixed flash welder, after being connect using the high heat-input amount pulsation of 8.5MJ or preheating flash butt welding, actual welding upset
Amount is maintained at 14.0mm, is air-cooled to room temperature after the completion of connector pushes away tumor.
After tested, examine confirmation martensite-free by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Tissue, corresponding metallographic structure as shown in Fig. 2, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reach 1610kN,
Amount of deflection 25.0mm meets EN standard requirements.
Embodiment 2
Mn content in R260 rail base material composition is controlled to be in 0.85% in limited time, during other chemical component C contents are in
Lower limit and when Si is maintained at≤0.30%, needs to be added 0.08%Cr and 0.02%V in molten steel in steelmaking process, omnipotent
The hot rolled rail mechanical property that line normally produces rolling meets Rm >=880MPa, when tyre tread hardness >=260HB, utilizes rail mobile
Flash welder or fixed flash welder, after being connect using the high heat-input amount pulsation of 8.5MJ or preheating flash butt welding, actual welding upset
Amount is maintained at 14.0mm, is air-cooled to room temperature after the completion of connector pushes away tumor.
After tested, examine confirmation martensite-free by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Tissue, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reaches 1610kN, amount of deflection 25.5mm, meets EN standard and wants
It asks.
Embodiment 3
Mn content in R260 rail base material composition is controlled to be in 0.88% in limited time, during other chemical component C contents are in
Lower limit and when Si is maintained at≤0.30%, needs to be added 0.07%Cr and 0.02%V in molten steel in steelmaking process, omnipotent
The hot rolled rail mechanical property that line normally produces rolling meets Rm >=880MPa, when tyre tread hardness >=260HB, utilizes rail mobile
Flash welder or fixed flash welder, after being connect using the high heat-input amount pulsation of 9.0MJ or preheating flash butt welding, actual welding upset
Amount is maintained at 14.5mm, is air-cooled to room temperature after the completion of connector pushes away tumor.
After tested, examine confirmation martensite-free by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Tissue, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reaches 1610kN, amount of deflection 26.0mm, meets EN standard and wants
It asks.
Embodiment 4
Mn content in R260 rail base material composition is controlled to be in 0.90% in limited time, during other chemical component C contents are in
Lower limit and when Si is maintained at≤0.30%, needs to be added 0.05%Cr and 0.02%V in molten steel in steelmaking process, omnipotent
The hot rolled rail mechanical property that line normally produces rolling meets Rm >=880MPa, and tyre tread hardness >=260HB is dodged using rail is mobile
Welding machine or fixed flash welder, after being connect using the high heat-input amount pulsation of 9.5MJ or preheating flash butt welding, actual welding upset amount
It is maintained at 15.0mm, is air-cooled to room temperature after the completion of connector pushes away tumor.
After tested, examine confirmation martensite-free by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Tissue, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reaches 1610kN, amount of deflection 26.0mm, meets EN standard and wants
It asks.
The present invention has good popularization and application foreground, especially climbs steel EN R260 rail in external inter-city passenger rail and subway
The online welding procedure unit of route is directly promoted the use of.
Claims (6)
1. a kind of method for controlling R260 WELDING JOINT martensitic structure, it is characterised in that the following steps are included: R260
Rail base material chemical Composition Control, hot rolling technology control, welding procedure control, the cooling control of postwelding, wherein control R260 rail
Mn content is that 0.80%~0.90%, C content is in lower limit, Si≤0.30%, steelmaking process to base material by weight percentage
In in molten steel be added 0.05%~0.10%Cr, 0.01%~0.03%V.
2. a kind of method for controlling R260 WELDING JOINT martensitic structure according to claim 1, feature exist
Make to roll mechanics property of rail in: hot rolling technology control and meets Rm >=880MPa, tyre tread hardness >=260HB.
3. a kind of method for controlling R260 WELDING JOINT martensitic structure according to claim 1 or 2, feature
Be: the cooling control of the postwelding is to be air-cooled to room temperature after the completion of connector pushes away tumor.
4. a kind of described in any item methods for controlling R260 WELDING JOINT martensitic structure according to claim 1~3,
It is characterized by: the welding procedure control welding upset amount is maintained at 14.0~15.0mm.
5. a kind of method for controlling R260 WELDING JOINT martensitic structure according to claim 1, feature exist
In: the hot rolling technology carries out hot rolling using universal rolling production line.
6. a kind of method for controlling R260 WELDING JOINT martensitic structure according to claim 1, feature exist
In: the welding procedure is using the high heat-input amount pulsation of 8.5~9.5MJ or preheating flash butt welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910701635.7A CN110512149B (en) | 2019-07-31 | 2019-07-31 | Method for controlling R260 steel rail flash welding joint martensite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910701635.7A CN110512149B (en) | 2019-07-31 | 2019-07-31 | Method for controlling R260 steel rail flash welding joint martensite structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110512149A true CN110512149A (en) | 2019-11-29 |
| CN110512149B CN110512149B (en) | 2021-01-26 |
Family
ID=68623796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910701635.7A Active CN110512149B (en) | 2019-07-31 | 2019-07-31 | Method for controlling R260 steel rail flash welding joint martensite structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110512149B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1192867A (en) * | 1997-09-17 | 1999-04-06 | Nippon Steel Corp | Low segregation pearlitic rail excellent in wear resistance and weldability and its production |
| CN108890106A (en) * | 2018-07-26 | 2018-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of the mobile Flash Butt Welding of 60kg/m R260 hot rolled rail |
| CN109079302A (en) * | 2018-08-29 | 2018-12-25 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of the mobile Flash Butt Welding of 60kg/m R260 hot rolled rail |
| 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 |
-
2019
- 2019-07-31 CN CN201910701635.7A patent/CN110512149B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1192867A (en) * | 1997-09-17 | 1999-04-06 | Nippon Steel Corp | Low segregation pearlitic rail excellent in wear resistance and weldability and its production |
| CN108890106A (en) * | 2018-07-26 | 2018-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of the mobile Flash Butt Welding of 60kg/m R260 hot rolled rail |
| CN109079302A (en) * | 2018-08-29 | 2018-12-25 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of the mobile Flash Butt Welding of 60kg/m R260 hot rolled rail |
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 傅刚斌 主编: "《建筑材料》", 31 January 2009 * |
| 王平 等议: "《现代铁路轨道：第2版》", 31 July 2014, 中国铁道出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110512149B (en) | 2021-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108504848B (en) | Heat treatment method of steel rail flash welding joint | |
| CN102365377B (en) | Method of cooling welded rail section, device for cooling welded rail section, and welded rail joint | |
| CN108754114B (en) | Heat treatment method for steel rail welding joint | |
| US20160194730A1 (en) | High-impact-toughness steel rail and production method thereof | |
| CN108660306B (en) | Postweld heat treatment method for hypereutectoid steel rail and eutectoid steel rail welded joint | |
| CN108796202B (en) | Heat treatment method for welded joint of dissimilar material steel rail | |
| CN109355482A (en) | The post weld heat treatment method of hypo eutectoid rail | |
| CN108374120A (en) | A kind of European standard R320Cr rail and its production method | |
| CN108950158B (en) | Heat treatment method for weld joint of eutectoid steel rail and hypereutectoid steel rail | |
| CN109022750A (en) | The post weld heat treatment method of rail | |
| CN110423941A (en) | A method of control R260 WELDING JOINT martensitic structure | |
| US20220064746A1 (en) | POST-WELD HEAT TREATMENT METHOD FOR 1,300 MPa-LEVEL LOW-ALLOY HEAT TREATED STEEL RAIL | |
| JP7417170B2 (en) | welding rail | |
| CN109055708B (en) | Heat treatment method for weld joint of eutectoid steel rail and hypereutectoid steel rail | |
| CN104451452A (en) | Bearing steel for wind power equipment and preparation method thereof | |
| CN113621881B (en) | Method for improving low-temperature toughness of medium-carbon steel rail welded joint | |
| CN110616368B (en) | Method for controlling R260 steel rail flash welding joint martensite structure | |
| CN110512148A (en) | A method of control R260 WELDING JOINT martensitic structure | |
| CN110512149A (en) | A method of control R260 WELDING JOINT martensitic structure | |
| CN110512139A (en) | A method of control R260 WELDING JOINT martensitic structure | |
| CN110438327A (en) | Hypo eutectoid steel rail weld joint heat treatment method | |
| CN114891967A (en) | Method for welding medium-low carbon pearlite steel rail | |
| CN110616367B (en) | Method for controlling R260 steel rail flash welding joint martensite structure | |
| CN110760761B (en) | Method for controlling R260 steel rail flash welding joint martensite structure | |
| CN110438328A (en) | A kind of hypo eutectoid steel rail weld joint heat treatment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |