CN106048175A - Turnout rail and production method thereof - Google Patents
Turnout rail and production method thereof Download PDFInfo
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- CN106048175A CN106048175A CN201610543903.3A CN201610543903A CN106048175A CN 106048175 A CN106048175 A CN 106048175A CN 201610543903 A CN201610543903 A CN 201610543903A CN 106048175 A CN106048175 A CN 106048175A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to the field of railways, and discloses a turnout rail and a production method thereof. A steel billet adopted by the method contains 0.2-0.3 wt% of C, 1.2-1.8 wt% of Si, 1.8-2.5 wt% of Mn, 1.3-1.6 wt% of Cr and Fe, wherein the total content of Mn and Cr is 3.2-3.7 wt%; and the method is combined with a specific acceleration cooling process to produce the turnout rail with excellent toughness. In preferential embodiment, the turnout rail contains few (0.01 wt% or below) or no precious alloy elements as Mo, Ni, V and Nb, so that the preparation cost is low.
Description
Technical field
The present invention relates to railway territory, in particular it relates to a kind of turnout rail and preparation method thereof.
Background technology
The great-leap-forward development of railway proposes requirements at the higher level to the military service performance of rail, and conventional pearlitic rail is gone through for many years
Development become better and approaching perfection day by day, circuit be on active service show, pearlite steel rail have excellence abrasion resistance properties, but contact resistance fatigue behaviour
Relative deficiency, in particular with China railways freight volume and the increase year by year of traffic density, rail fatigue trauma the most progressively becomes shadow
Ring the primary factor of rail service life.Research shows, bainite structure is applied to rail field and can effectively solve rail
Fatigue defect problem.Since the nineties in last century, China has carried out further investigation and has achieved rich in bainite rail field
Large achievement in research.But, compared to pearlite steel rail, it is the poorest that bainite rail then exists in terms of cost with economy
Away from.Common pearlite steel rail generally uses the high-carbon content of carbon content 0.65-0.95 weight % to design, and is aided with appropriate Si, Mn
Element, and choose whether as required in steel, add the elements such as a small amount of Cr, V, Nb, alloying cost is relatively low, possesses big rule
The basis of mould popularization and application.By contrast, the precious alloy such as alloying element content particularly Mo, Ni, V, Nb in bainite rail
Constituent content is significantly higher, to reach to obtain under conditions of air cooling the purpose of fined bainite structure after rolling, by
In expensive, limit this popularization and application with premium properties rail.
Summary of the invention
It is an object of the invention to overcome prior art to prepare the high defect with poor performance of bainite turnout rail cost, it is provided that one
Plant turnout rail and preparation method thereof.
The present inventor finds under study for action, uses suitable Controlled cooling process, by strong refined crystalline strengthening
Effect, can not only be greatly improved the tough combination property of turnout rail, moreover it is possible to steel is greatly reduced under conditions of obtaining equal performance
The content of the expensive alloying elements such as middle alloying element, particularly Mo, Ni, V, Nb, i.e. utilizes the rolling waste heat of turnout rail, by essence
True Controlled cooling process, it is possible to meet or exceed the effect that expensive alloying elements plays.
Thus, the invention provides a kind of method preparing turnout rail, wherein, the method comprises the following steps:
(1) hot rolling contains C:0.2-0.3wt%, Si:1.2-1.8wt%, Mn:1.8-2.5wt%, Cr:1.3-1.6wt%
Forming turnout rail with the steel billet of Fe and carry out natural cooling, wherein, the total content of Mn and Cr is 3.2-3.7wt%；
(2) when the rail head skin temperature of described turnout rail is down to 800 DEG C, respectively to the rail head tread center of turnout rail and
Rail head both sides apply cooling medium makes turnout rail carry out first stage acceleration cooling with the rate of cooling of 10-20 DEG C/s；
(3) when rail head tread central temperature is down to 400-420 DEG C, rail head and the flange of rail to turnout rail apply cooling simultaneously
Medium makes turnout rail carry out second stage acceleration cooling with the rate of cooling of 5-8 DEG C/s, accelerates cooling in described second stage
During, the rate of cooling in the long leg siding track rostral face of described turnout rail higher than short-leg siding track rostral face rate of cooling 1-2 DEG C/
s；
(4) when rail head tread central temperature is down to 200-240 DEG C, stop second stage and accelerate cooling and by turnout rail sky
It is cooled to room temperature.
Present invention also offers the turnout rail prepared by described method.
The present invention prepares the turnout rail with higher comprehensive performance by the content and cooling technique controlling alloying element,
The main alloy element of described turnout rail is C, Si, Mn and Cr, according to the present invention one preferred embodiment, described rail
In without the expensive alloying elements such as Mo, Ni, V, Nb, preparation cost is low.Further, the turnout rail that prepared by the method for the invention is with carefully
It is main for changing bainite, comprises the heterogeneous structure of a small amount of martensite and retained austenite simultaneously, and rail head tunneling boring hardness is evenly distributed,
Apply as heavy haul railway track switch after being suitable for cutting Milling Machining.Described " on a small quantity " is relative to refining containing of bainite in turnout rail
For amount.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that described herein specifically
Embodiment is merely to illustrate and explains the present invention, is not limited to the present invention.
The end points of scope disclosed in this article and any value are not limited to this accurate scope or value, these scopes or
Value should be understood to the value comprised close to these scopes or value.For numerical range, between the endpoint value of each scope, respectively
Between endpoint value and the single point value of individual scope, and can obtain one or more between single point value with combination with one another
New numerical range, these numerical rangies should be considered the most specifically to disclose.
The invention provides the preparation method of a kind of turnout rail, wherein, the method may comprise steps of:
(1) hot rolling contains C:0.2-0.3wt%, Si:1.2-1.8wt%, Mn:1.8-2.5wt%, Cr:1.3-1.6wt%
Forming turnout rail with the steel billet of Fe and carry out natural cooling, wherein, the total content of Mn and Cr is 3.2-3.7wt%；
(2) when the rail head skin temperature of described turnout rail is down to 800 DEG C, respectively to the rail head tread center of turnout rail and
Rail head both sides apply cooling medium makes turnout rail carry out first stage acceleration cooling with the rate of cooling of 10-20 DEG C/s；
(3) when rail head tread central temperature is down to 400-420 DEG C, rail head and the flange of rail to turnout rail apply cooling simultaneously
Medium makes turnout rail carry out second stage acceleration cooling with the rate of cooling of 5-8 DEG C/s, accelerates cooling in described second stage
During, the rate of cooling in the long leg siding track rostral face of described turnout rail higher than short-leg siding track rostral face rate of cooling 1-2 DEG C/
s；
(4) when rail head tread central temperature is down to 200-240 DEG C, stop second stage and accelerate cooling and by turnout rail sky
It is cooled to room temperature.
In steel billet described below, main alloy element content is limited to the reason of above-mentioned scope:
Carbon (C) is to obtain required strong hardness and the most important element of comprehensive mechanical property.When carbon content is less than 0.2wt%
Time, it is impossible to give full play to strengthening effect, cause turnout rail strong hardness too low, and then the abrasion resistance properties of turnout rail cannot be ensured；
When carbon content is higher than 0.3wt%, after using accelerated cooling process, the intensity index of turnout rail is too high and toughness plasticity is too low, no
It is beneficial to the service safety of turnout rail.Therefore, carbon content is limited to 0.2-0.3wt%.
Silicon (Si) is generally present in ferrite with solution as the main adding elements in steel, it is possible to increase tissue
Intensity.When silicone content is less than 1.2wt%, it is impossible to effectively thick, in discontinuously arranged Carbide Precipitation in suppression steel, it is impossible to
Obtain non-carbide bainitic steel；When silicone content is higher than 1.8wt%, to the microstructure and property of turnout rail without significantly improving, with
Shi Zengjia turnout rail surface produces the probability of defect.Therefore, silicone content is limited to 1.2-1.8wt%.
Manganese (Mn) can significantly reduce bainite structure and start transition temperature, increases the hardness of carbide, particularly this
In bright under conditions of without Mo, Mn will add in steel as main alloy element.When Fe content is less than 1.8wt%,
It is difficult to reach to the positive role of bainitic steel；When Fe content is higher than 2.5wt%, the fatigue behaviour of turnout rail significantly reduces；
Meanwhile, the segregation degree of steel is significantly increased, and is easily formed martensitic structure under follow-up cooling condition, is unfavorable for the military service of turnout rail
Safety.Therefore, Fe content is limited to 1.8-2.5wt%.
Chromium (Cr) can promote C curve to move to right and increase the quenching degree of turnout rail, is the weight in bainite turnout rail equally
Want addition element.In steel billet without Mo under conditions of, chromium simultaneously works as forcing down bainite transformation temperature and improves track switch
The purpose of rail abrasion resistance properties.When chromium content is less than 1.3wt%, its effect in turnout rail is difficult to fully demonstrate；Work as chromium
When content is higher than 1.6wt%, the beneficially carbon in steel forms complicated carbide, although be of value to the raising of polishing machine, but same
Time can deteriorate the toughness plasticity of turnout rail.Therefore, chromium content is limited to 1.3-1.6wt%.
For guaranteeing that turnout rail of the present invention obtains excellent military service performance, the total content of Mn and Cr need to meet 3.2-
3.7wt%.Even if reason is to use to roll rear accelerated cooling process, for guaranteeing continuous cooling process obtains many as far as possible and refinement
Bainite structure, still need to ensure that Mn and Cr constituent content is within the specific limits in turnout rail.When the total content of Mn and Cr is less than
During 3.2wt%, even if using quickly cooling, also cannot completely inhibit pro-eutectoid ferrite in steel and separating out, it is impossible to reaching the present invention
Purpose；When the total content of Mn and Cr is higher than 3.7wt%, in cooling procedure, a large amount of carbon will be separated out on ferrite matrix
Compound, simultaneously by producing the most serious segregation, is unable to reach the purpose of the present invention equally.Therefore, the total content of Mn and Cr needs
Meet 3.2-3.7wt%.
According to the present invention, it was found by the inventors of the present invention that when the component content of described steel billet is controlled at above-mentioned composition model
In enclosing, and combine the cooling technique in the described method of the present invention and can obtain tough high comprehensive performance and lower-cost road
Switch track.Wherein it is preferred to, (on the basis of the gross weight of described steel billet) described steel billet can contain C:0.28-0.3wt%,
The total content of Si:1.5-1.6wt%, Mn:2.15-2.4wt%, Cr:1.4-1.5wt%, Mn and Cr is 3.6-3.7wt%.
According to the present invention, described steel billet can also also have P and S.The content of P can be 0.011-0.014wt%, S's
Content can be 0.002-0.004wt%.Main component in described steel billet is Fe, and the content of described Fe can be 94-
95wt%.
According to the present invention, the total content of the expensive alloying elements in described steel billet at below 0.01wt%, described valuable conjunction
Gold element includes Mo, Ni, V and Nb.Under preferable case, without expensive alloying elements in described steel billet.
According to the present invention, the steel billet of above-mentioned composition can be obtained by the conventional method of this area, for example with converter or
The electric furnace smelting molten steel containing mentioned component, through external refining, Fruit storage, continuous casting is bloom, then by this bloom
Sending into heating and thermal insulation in heating furnace, just can obtain steel billet of the present invention, concrete process does not repeats them here.
According to the present invention, to the mode of described hot rolling, there is no particular limitation, can be the conventional hot rolling mode in this area,
Such as can use pass method or omnipotent method that described hot rolling of steel billet is obtained turnout rail, cooling procedure subsequently can be carried out, right
The condition of described hot rolling is not particularly limited, and can be the normal condition of this area.
According to the present invention, after described hot rolling, utilize the hot rolling waste heat of turnout rail, by the way of natural cooling, by track switch
The rail head skin temperature of rail is down to 800 DEG C, carries out first stage acceleration cooling the most again.
For the bainite turnout rail of excellent, bainite structure to be obtained, but also need to obtain to the greatest extent
May the bainite structure (the bainite ferrite lath such as refined) of refinement, the most just can ensure that obtain excellent comprehensive
The turnout rail of energy, the composition of steel billet not only be there are certain requirements, but also needs strictly to control accelerated cooling process by this.
According to the present invention, it is 10-20 DEG C/s that the first stage accelerates the rate of cooling of cooling, can by controlling this rate of cooling
Can be quickly through ferrite-pearlite transition region the precipitation that suppresses pro-eutectoid ferrite during continuous cooling.
Preferably, it is 12-15 DEG C/s that the first stage accelerates the rate of cooling of cooling, more preferably 14-15 DEG C/s.
According to the present invention, when rail head tread central temperature is down to 400-420 DEG C, simultaneously to the rail head of described turnout rail and
The flange of rail carries out second stage and accelerates cooling.Under preferable case, in step (3), when rail head tread central temperature is down to 415-419 DEG C
Time, rail head and the flange of rail to described turnout rail carry out second stage and accelerate cooling simultaneously.Simultaneously to the rail head of described turnout rail and
It is to avoid rail head to make deflection of rail because cooling is too fast that the flange of rail applies the purpose of cooling medium, it is impossible to meet flatness requirements.
According to a kind of preferred implementation of the present invention, described second stage accelerate the rate of cooling of cooling be 7-7.5 DEG C/
S, the rail more excellent to obtain combination property.
According to the present invention, the selection of the cooling medium that the described first stage accelerates cooling and second stage acceleration cooling does not has
There is particularly restriction, if the effect needed for being obtained in that the present invention, it is preferable that and the described first stage accelerates the cold of cooling
But medium is mist mixture, and it is compressed air that described second stage accelerates the cooling medium of cooling.
According to the present invention, when rail head tread central temperature is down to 200-240 DEG C, when preferably 220-230 DEG C, stop the
Two-stage accelerates cooling air cooling to room temperature.
Present invention also offers the turnout rail prepared by said method.Described turnout rail has excellent tensile property, often
Temperature impact property and rail head tread hardness, and wear weight loss amount is little；Meanwhile, in turnout rail containing a small amount of (below 0.01wt%) or
Without expensive alloying elements Mo, Ni, V and Nb, low cost.
Hereinafter will be described the present invention by embodiment.In following example, " room temperature " refers to " 25 DEG C ".
The chemical composition that the steel billet that following example are used contains is as shown in table 1, and the steel billet that comparative example is used contains
Some chemical compositions are as shown in table 2, and wherein, in addition to the element in Tables 1 and 2, surplus is Fe and the most miscellaneous
Matter:
Table 1
Table 2
Embodiment 1-6
1# to 6# steel billet in table 1 is rolled into 60AT1 turnout rail under conditions of 1200 DEG C, according to table 3 reference numeral
The 60AT1 turnout rail that 1# to 6# hot rolling of steel billet in table 1 is become by shown accelerated cooling process respectively is accelerated cooling, then
Air cooling, to room temperature, obtains turnout rail A1 to A6.
Table 3
Comparative example 1-6
1# to 6# steel billet in table 2 is rolled into 60AT1 turnout rail under conditions of 1200 DEG C, Direct Air-Cooled to room temperature,
Obtain turnout rail D1 to D6.
Test case 1
Performance inspection is carried out according to turnout rail A1-A6 and D1-D6 that embodiment 1-6 and comparative example 1-6 are prepared by following methods
Survey, specifically:
Measure the tensile property of turnout rail by GB/T228.1-2010 " metal material tensile testing at ambient temperature ", record
Rm(tensile strength), A% (percentage elongation), result is as shown in table 4；
Measure impact property and the hardness of turnout rail by the method in current art, result is as shown in table 4；
MM200 type abrasion tester is carried out wear test with measure wear and tear average weight loss, turnout rail taken from by sample
The upper sample of the rail head of A1-A6 and D1-D6, in all wear tests, lower grind away material is the most identical, and concrete test parameters is such as
Under:
Specimen size: thickness 10mm, diameter 36mm circle sample；Test load: 150kg；Slippage: 10%；Sample material lower to mill
Matter: hardness is the U75V hot rolled rail of 280-310HB, and hardness is suitable with train wheel hardness；The speed of rotation: 200 revs/min；
Always wear and tear number of times: 100,000 times；
Wear weight loss amount is calculated as follows: the weight of sample after the weight-abrasion of wear weight loss amount=sample before wearing.
Result is as shown in table 4.
Table 4
From above-described embodiment and the results contrast of comparative example, after relying on rolling waste heat and rolling, substep accelerates cooling skill
Art, contains only the conventional inexpensive elements such as appropriate C, Si, Mn, Cr although with in turnout rail prepared by the method for the invention,
But turnout rail is tough, and integrated performance index has met or exceeded the bainite track switch adding the expensive alloying elements such as Ni, Mo
Rail.Therefore, on the premise of obtaining similar performance, the present invention is greatly reduced expensive alloying elements content, thus reduces preparation
Cost, and product has excellent tough combination property, can be applicable to heavy haul railway and line condition complicated highway section.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned embodiment
Detail, in the technology concept of the present invention, technical scheme can be carried out multiple simple variant, this
A little simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, at not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy illustrates the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it should be considered as content disclosed in this invention equally.
Claims (6)
1. the method preparing turnout rail, it is characterised in that the method comprises the following steps:
(1) hot rolling contains C:0.2-0.3wt%, Si:1.2-1.8wt%, Mn:1.8-2.5wt%, Cr:1.3-1.6wt% and Fe
Steel billet and form turnout rail and carry out natural cooling, wherein, the total content of Mn and Cr is 3.2-3.7wt%；
(2) when the rail head skin temperature of described turnout rail is down to 800 DEG C, rail head tread center and the rail head to turnout rail respectively
Both sides apply cooling medium makes turnout rail carry out first stage acceleration cooling with the rate of cooling of 10-20 DEG C/s；
(3) when rail head tread central temperature is down to 400-420 DEG C, rail head and the flange of rail to turnout rail apply cooling medium simultaneously
Make turnout rail carry out second stage with the rate of cooling of 5-8 DEG C/s and accelerate cooling, during second stage accelerates cooling, institute
The rate of cooling in the long leg siding track rostral face stating turnout rail is higher than the rate of cooling 1-2 DEG C/s in short-leg siding track rostral face；
(4) when rail head tread central temperature is down to 200-240 DEG C, stop second stage accelerate cooling and by turnout rail air cooling extremely
Room temperature.
Method the most according to claim 1, wherein, containing C:0.28-0.3wt%, Si:1.5-in described steel billet
The total content of 1.6wt%, Mn:2.15-2.4wt%, Cr:1.4-1.5wt%, Mn and Cr is 3.6-3.7wt%.
Method the most according to claim 1 and 2, wherein, the total content of the expensive alloying elements in described steel billet exists
Below 0.01wt%, described expensive alloying elements includes Mo, Ni, V and Nb.
Method the most according to claim 3, wherein, without expensive alloying elements in described steel billet.
Method the most according to claim 1 and 2, wherein, it is that water smoke mixes that the described first stage accelerates the cooling medium of cooling
Compound, it is compressed air that second stage accelerates the cooling medium of cooling.
6. the turnout rail prepared by the method described in any one in claim 1-5.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610543903.3A CN106048175B (en) | 2016-07-12 | 2016-07-12 | A kind of turnout rail and preparation method thereof |
| AU2017204403A AU2017204403B2 (en) | 2016-07-12 | 2017-06-28 | A turnout rail and preparation method thereof |
| DE102017115472.8A DE102017115472A1 (en) | 2016-07-12 | 2017-07-11 | Switch rail and its production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610543903.3A CN106048175B (en) | 2016-07-12 | 2016-07-12 | A kind of turnout rail and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106048175A true CN106048175A (en) | 2016-10-26 |
| CN106048175B CN106048175B (en) | 2018-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610543903.3A Active CN106048175B (en) | 2016-07-12 | 2016-07-12 | A kind of turnout rail and preparation method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN106048175B (en) |
| AU (1) | AU2017204403B2 (en) |
| DE (1) | DE102017115472A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110358904A (en) * | 2019-05-30 | 2019-10-22 | 邯郸钢铁集团有限责任公司 | The control method of rail shape after rail burning optimization on line |
| CN115852117A (en) * | 2022-12-15 | 2023-03-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel for nano-structure bainite frog |
| CN115927814A (en) * | 2022-12-15 | 2023-04-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel for low-torsion bainite frog |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175980A (en) * | 1995-01-20 | 1998-03-11 | 英国钢铁公司 | Improvements in and relating to cartide-free bainitic steels and method of producing such steels |
| JP4644105B2 (en) * | 2005-11-28 | 2011-03-02 | 新日本製鐵株式会社 | Heat treatment method for bainite steel rail |
| CN103160736A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | High-strength bainite steel rail and heat treatment process thereof |
| CN103993237A (en) * | 2014-05-22 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Abrasion-resistant bainite switch rail and production method thereof |
-
2016
- 2016-07-12 CN CN201610543903.3A patent/CN106048175B/en active Active
-
2017
- 2017-06-28 AU AU2017204403A patent/AU2017204403B2/en active Active
- 2017-07-11 DE DE102017115472.8A patent/DE102017115472A1/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175980A (en) * | 1995-01-20 | 1998-03-11 | 英国钢铁公司 | Improvements in and relating to cartide-free bainitic steels and method of producing such steels |
| JP4644105B2 (en) * | 2005-11-28 | 2011-03-02 | 新日本製鐵株式会社 | Heat treatment method for bainite steel rail |
| CN103160736A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | High-strength bainite steel rail and heat treatment process thereof |
| CN103993237A (en) * | 2014-05-22 | 2014-08-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Abrasion-resistant bainite switch rail and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110358904A (en) * | 2019-05-30 | 2019-10-22 | 邯郸钢铁集团有限责任公司 | The control method of rail shape after rail burning optimization on line |
| CN110358904B (en) * | 2019-05-30 | 2020-11-03 | 邯郸钢铁集团有限责任公司 | Method for controlling rail shape after on-line heat treatment of steel rail |
| CN115852117A (en) * | 2022-12-15 | 2023-03-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel for nano-structure bainite frog |
| CN115927814A (en) * | 2022-12-15 | 2023-04-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel for low-torsion bainite frog |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106048175B (en) | 2018-03-06 |
| AU2017204403A1 (en) | 2018-02-01 |
| AU2017204403B2 (en) | 2018-07-19 |
| DE102017115472A1 (en) | 2018-01-18 |
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