CN110512148A - A method of control R260 WELDING JOINT martensitic structure - Google Patents
A method of control R260 WELDING JOINT martensitic structure Download PDFInfo
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- CN110512148A CN110512148A CN201910701637.6A CN201910701637A CN110512148A CN 110512148 A CN110512148 A CN 110512148A CN 201910701637 A CN201910701637 A CN 201910701637A CN 110512148 A CN110512148 A CN 110512148A
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Machines For Laying And Maintaining Railways (AREA)
- Heat Treatment Of Steel (AREA)
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, including R260 rail base material chemical Composition Control, hot rolling technology control, welding procedure control, the cooling control of postwelding, wherein Mn content is that 0.90%~1.0%, C content is in lower limit, Si≤0.30%, 0.03%~0.05%Cr to control R260 rail base material by weight percentage.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 EN 14587-2:2009 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 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 0.90%~1.0%, C content is in control R260 rail base material by weight percentage
0.03%~0.05%Cr is 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, 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.
Wherein, when welding procedure control is air-cooled to 550~520 DEG C after the completion of connector pushes away tumor, the cooling control of postwelding is carried out.
Wherein, the cooling control of postwelding is cooled to 300 DEG C hereinafter, air-cooled to room temperature again when connector temperature is kept the temperature.
Wherein, the cooling control of postwelding is that butt welding rear joint keep the temperature cooling (slow cooling), and control joint is in austenite to pearl
The cooling velocity of the phase transition temperature interval of body of light transformation is in 0.6~0.3 DEG C/s.
Specifically, control joint 620~500 DEG C of sections cooling rate in 0.6~0.3 DEG C/s.
Wherein, the cooling control of postwelding carries out slow cooling using attemperator, and attemperator embeds sial using hinge type structure
The rail head attemperator or tunneling boring rail attemperator of silicate fiber cotton.
Further, attemperator length 190mm~220mm；Aluminate fiber cotton thickness 35mm.
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 in the case where 0.90%~1.0%, flash welding connector can avoid in rail head median plane and
Check that martensitic structure occurs in position, ensure that connector items mechanical performance index, meets EN 14587-2 as defined in rail bottom foot:
The technical requirements of 2009 standards；The present invention is kept the temperature using easy rail head attemperator or tunneling boring rail attemperator
Cooling control, by the setting to attemperator length and thickness, preferably controls postwelding cooling velocity；The present invention controls work
Skill is simple, mating can solve the problems, such as the great welding technique on EN R260 rail promotion and application road, has good popularization
Application prospect.
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 that rail head attemperator of the present invention keeps the temperature schematic diagram, and wherein a is attemperator length；
Fig. 3 is that tunneling boring attemperator of the present invention keeps the temperature schematic diagram；
Fig. 4 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 R220R260R260Mn 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~20mm hang down
The microscopic structure of straight median plane position is as shown in Figure 1.Rail vertical central plane is the center crystal plane of continuous casting steel billet, is C, Mn etc.
Element segregation is 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 0.90%~1.0%, C content is in lower limit, Si≤0.30% to material by weight percentage, in steelmaking process
0.03%~0.05%Cr is added in molten steel.C content is in lower limit general control between 0.70~0.75%.
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 makes welding upset amount be maintained at 14.0~15.0mm.The present invention terminates laggard in hot rolling
Enter the welding procedure control stage, wherein having carried out special control to upset amount, because upset amount is too small, weld seam, which exists, not to be extracted only
Oxide, reduce joint performance；Excessive upset amount leads to cold junction, and performance equally reduces.It needs to pass through in practice operation
A large amount of quiet curved or stretching experiments 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.
Further, when welding procedure is air-cooled to 550~520 DEG C after the completion of connector pushes away tumor, the cooling control of postwelding is carried out.
The cooling control of postwelding is even more important, and the present invention carries out cooling control in such a way that heat preservation is cooling, and connector is worked as in control
Temperature is cooled to 300 DEG C hereinafter, air-cooled to room temperature again.
The present invention reduces cooling velocity by way of keeping the temperature cooling (slow cooling), so that martensitic structure be avoided to occur.Tool
Body, control joint phase transition temperature interval from austenite to perlitic transformation cooling velocity in 0.6~0.3 DEG C/s.Pass through
A large number of experiments verifying, postwelding control joint 620~500 DEG C of sections cooling velocity in 0.6~0.3 DEG C/s, can avoid be more than
Critical martensite transfor mation speed.
Specifically, the cooling control of postwelding carries out slow cooling using attemperator, attemperator embeds silicon using hinge type structure
The rail head attemperator (Fig. 2) or tunneling boring rail attemperator (Fig. 3) of aluminate fiber cotton.
Wherein, the length of attemperator and thickness are very big to the cooling influence of heat preservation, in order to preferably control cooling velocity,
Preferably, setting attemperator length 190mm~220mm, aluminate fiber cotton thickness 35mm.
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.
Embodiment 1
Control R260 rail base material composition in when Mn content be in 0.91%, other chemical component C contents be in lower limit,
And Si needs to be added 0.05%Cr in molten steel in steelmaking process, omnipotent line normally produces rolling when being maintained at≤0.30%
Hot rolled rail mechanical property meet Rm >=880MPa, tyre tread hardness >=260HB utilizes the mobile flash welder of rail or fixed dodges
Welding machine, 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,
When being air-cooled to 520 DEG C after the completion of connector pushes away tumor, the rail head of 35mm thickness aluminosilicate fiber cotton is embedded using hinge type structure
Attemperator or tunneling boring rail attemperator carry out slow cooling, length of slow cooling device 190mm are kept the temperature, when slow cooling temperature is to 300 DEG C
Attemperator is removed after below, makes connector air-cooled to room temperature.
After tested, connector examines confirmation without horse by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Family name's body tissue, corresponding metallographic structure as shown in figure 4, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reach
1610kN, amount of deflection 25.0mm meet EN standard requirements.
Embodiment 2
Control R260 rail base material composition in when Mn content be in 0.95%, other chemical component C contents be in lower limit,
And Si needs to be added 0.04%Cr in molten steel in steelmaking process, omnipotent line normally produces rolling when being maintained at≤0.30%
Hot rolled rail mechanical property meet Rm >=880MPa, tyre tread hardness >=260HB utilizes the mobile flash welder of rail or fixed dodges
Welding machine, 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,
When being air-cooled to 530 DEG C after the completion of connector pushes away tumor, the rail head of 35mm thickness aluminosilicate fiber cotton is embedded using hinge type structure
Attemperator or tunneling boring rail attemperator carry out slow cooling, length of slow cooling device 200mm are kept the temperature, when slow cooling temperature is to 300 DEG C
Attemperator is removed after below, makes connector air-cooled to room temperature.
After tested, connector examines confirmation without horse by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Family name's body tissue, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reaches 1610kN, amount of deflection 25.6mm, meets EN mark
Alignment request.
Embodiment 3
Control R260 rail base material composition in when Mn content be in 0.98%, other chemical component C contents be in lower limit,
And Si is maintained at≤0.30%, needs to be added 0.03%%Cr in molten steel in steelmaking process, omnipotent line normally produces rolling
Hot rolled rail mechanical property meet Rm >=880MPa, when tyre tread hardness >=260HB；Utilize the mobile flash welder of rail or fixation
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 when being air-cooled to 540 DEG C after the completion of connector pushes away tumor, embeds 35mm thickness aluminosilicate fiber cotton using hinge type structure
Rail head attemperator or tunneling boring rail attemperator carry out slow cooling, keep the temperature length of slow cooling device 200mm, when slow cooling temperature arrives
Attemperator is removed after 300 DEG C or less, makes connector air-cooled to room temperature.
After tested, connector examines confirmation without horse by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Family name's body tissue, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reaches 1610kN, amount of deflection 24.0mm, meets EN mark
Alignment request.
Embodiment 4
Control R260 rail base material composition in when Mn content be in 1.0%, other chemical component C contents be in lower limit,
And Si is maintained at≤0.30%, needs to be added 0.03%Cr in molten steel in steelmaking process, omnipotent line normally produces rolling
Hot rolled rail mechanical property meets Rm >=880MPa, when tyre tread hardness >=260HB；Utilize the mobile flash welder of rail or fixed sudden strain of a muscle
Welding machine, after being connect using the high heat-input amount pulsation of 9.5MJ or preheating flash butt welding, actual welding upset amount is maintained at 15.0mm,
When being air-cooled to 550 DEG C after the completion of connector pushes away tumor, the rail head of 35mm thickness aluminosilicate fiber cotton is embedded using hinge type structure
Attemperator or tunneling boring rail attemperator carry out slow cooling, length of slow cooling device 210mm are kept the temperature, when slow cooling temperature is to 300 DEG C
Attemperator is removed after below, makes connector air-cooled to room temperature.
After tested, connector examines confirmation without horse by the rail head of EN14587-2:2009 standard requirements and rail bottom foot specified position
Family name's body tissue, corresponding metallographic structure as shown in figure 3, and the continuous quiet curved load of 5 R260 rail joints of the embodiment reach
1610kN, amount of deflection 26.0mm meet EN standard requirements.
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 (10)
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 postweld heat preservation, wherein controlling R260
Mn content is that 0.90%~1.0%, C content is in lower limit, Si≤0.30% to rail base material by weight percentage, is made steel
0.03%~0.05%Cr is added in journey in molten steel.
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 welding procedure control welding upset amount is maintained at 14.0~15.0mm.
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: it is cold to carry out postweld heat preservation when the welding procedure control is air-cooled to 550~520 DEG C after the completion of connector pushes away tumor
But it controls.
5. a kind of method for controlling R260 WELDING JOINT martensitic structure according to any one of claims 1 to 4,
It is characterized by: the cooling control postwelding connector temperature heat preservation of the postweld heat preservation is cooled to 300 DEG C hereinafter, air-cooled to room temperature again.
6. a kind of described in any item methods for controlling R260 WELDING JOINT martensitic structure according to claim 1~5,
It is characterized by: the cooling control of the postwelding is that butt welding rear joint carries out heat preservation cooling, control joint is in austenite to pearlite
The cooling velocity of the phase transition temperature interval of transformation is in 0.6~0.3 DEG C/s.
7. a kind of described in any item methods for controlling R260 WELDING JOINT martensitic structure according to claim 1~6,
It is characterized by: the cooling control of the postwelding is that butt welding rear joint carries out heat preservation cooling, control joint is in 620~500 DEG C of sections
Cooling velocity in 0.6~0.3 DEG C/s.
8. a kind of described in any item methods for controlling R260 WELDING JOINT martensitic structure according to claim 1~7,
It is characterized by: the cooling control of the postwelding carries out heat preservation cooling using attemperator, attemperator is using in hinge type structure
The rail head attemperator or tunneling boring rail attemperator of embedding aluminosilicate fiber cotton.
9. a kind of method for controlling R260 WELDING JOINT martensitic structure according to claim 7, feature exist
In: the attemperator length 190mm~220mm；Aluminosilicate fiber cotton is with a thickness of 35mm.
10. 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.
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| CN201910701637.6A CN110512148B (en) | 2019-07-31 | 2019-07-31 | Method for controlling R260 steel rail flash welding joint martensite structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115488483A (en) * | 2022-11-03 | 2022-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bonding strength of steel rail flash butt joint |
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| CN115488483A (en) * | 2022-11-03 | 2022-12-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bonding strength of steel rail flash butt joint |
| CN115488483B (en) * | 2022-11-03 | 2024-04-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bonding strength of steel rail flash butt welding joint |
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