CN104988405B - A kind of passenger-cargo mixed utilization rail and its production method and application - Google Patents
A kind of passenger-cargo mixed utilization rail and its production method and application Download PDFInfo
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Abstract
The invention discloses a kind of passenger-cargo mixed utilization rail and preparation method thereof, by globular pearlite organizational composition, the thickness at described gauge angle is 3 5mm, and hardness is 311 350HB, and elongation percentage is 12.5 16% at the gauge angle of this passenger-cargo mixed utilization rail.Shown preparation method includes：Rail after finish to gauge is quickly cooled down, then gauge angular position is quickly heated and be incubated；The condition of quick cooling includes：Open cold temperature and be 800 880 DEG C, rate of cooling is 26 DEG C/s, final cooling temperature is 430 470 DEG C；The quick condition heating and being incubated includes：With the programming rate of 3.0 4.0 DEG C/s, gauge angle temperature is increased to 700 800 DEG C and is incubated 2 4min.The passenger-cargo mixed of the present invention has high intensity, high-wearing feature and high contacting fatigue resistance with rail, and especially the phase has excellent anti-wear performance and contacting fatigue resistance before use.
Description
Technical field
The present invention relates to a kind of passenger-cargo mixed utilization rail and its production method and application.
Background technology
The end of the year in 2013, China railways operation mileage reached 9.8 ten thousand kilometers, and except more than 10,000 kilometers of height
Outside fast passenger rail, special freight corridor, the passenger-cargo mixed fortune railway of about 80,000 kilometrages is transported in the passenger transportation of China and shipping
Great function has been played in defeated.
One important feature of passenger-cargo mixed fortune railway is to open passenger train and goods train simultaneously.Passenger train is usual
Speed is fast, axle heavy and light, and the generally abrasion to rail is less, and contact fatigue property requires higher；And the usual speed of goods train is slow,
Axle is great, and rail defects and failures is mainly based on wearing away.Therefore, during the early application on passenger-cargo mixed transport line road, train passes through car
Number is more, but the freight volume that reality is passed through is relatively low, easily rolling contact fatigue at the gauge angle of rail.
In recent years, domestic rail research worker is directed to the uniqueness of passenger-cargo mixed fortune railway, in terms of rail kind
To improve contacting fatigue resistance and the abrasion resisting performance of rail.Such as Deng builds publications CN such as brightness, Mei Dongsheng, Xu Quan
101148736A " rail and its production method " invented in field of metallurgy a kind of good rail of anti-rolling contact fatigue performance and
The production method of this rail, the chemical composition of its rail is C=0.61%～0.73%, Si=0.20%～0.50%, Mn=
0.80%～1.30% and the Fe of aequum and other trace element, its tensile strength Rm >=1080MPa, fracture toughness KIC
≥45MPa·m1/2.This rail shows good contacting fatigue resistance and comprehensive using effect when actually used.This
The production method of bright rail, implements burning optimization on line including to the rail after roll forming, wherein simultaneously to the rail head of rail, rail
Waist, the flange of rail carry out quenching cooling.By carrying out quenching cooling to the rail head of rail, the web of the rail, the flange of rail simultaneously, rail is made to reach tension
Intensity Rm >=1080MPa, fracture toughness KIC >=45MPa m1/2.This patent, by carrying out to rail forcing cooling, improves rail
Intensity and toughness, thus improving abrasion resistance and the contact resistance fatigue behaviour of rail.
In the early application stage of the rail on passenger-cargo mixed transport line road, because its gauge angle intensity and hardness are higher, abrasion performance
Performance is good, easily rolling contact fatigue on the contrary, but prior art all not contact resistance fatigue behaviours to rail early stage
Give to pay special attention to.
Content of the invention
The purpose of the present invention overcomes existing passenger-cargo mixed fortune railway contact fatigue strain easily using early stage
Present situation, provides a kind of passenger-cargo mixed utilization rail and its production method, this passenger-cargo mixed with rail have high intensity, high-wearing feature and
High contacting fatigue resistance, especially the phase has excellent anti-wear performance and contacting fatigue resistance before use.
The invention provides a kind of passenger-cargo mixed utilization rail, the gauge angle of this passenger-cargo mixed utilization rail is by globular pearlite group
It is configured to, the thickness at described gauge angle is 3-5mm, and hardness is 311-350HB, and elongation percentage is 12.5-16%.
Present invention also offers the method producing the passenger-cargo mixed utilization rail of the present invention, the method includes：After finish to gauge
Rail is quickly cooled down, and then gauge angular position is quickly heated and is incubated；The condition of quick cooling includes：Open cold temperature
Spend for 800-880 DEG C, rate of cooling is 2-6 DEG C/s, final cooling temperature is 430-470 DEG C；The quick condition heating and being incubated includes：
With the programming rate of 3.0-4.0 DEG C/s, gauge angle temperature is increased to 700-800 DEG C and is incubated 2-4min.
Invention additionally provides the present invention produces the passenger-cargo mixed utilization steel that the method production of passenger-cargo mixed utilization rail obtains
Rail.
The inventors found that globular pearlite is organized due to its preferably moulding performance and slightly lower abrasion performance
The metallographic structure at gauge angle can be highly suitable as, such gauge angle, due to having preferably moulding performance, can quickly be ground
Fall, form good wheel-rail contact relationship, the phase has good abrasion resistance and anti-contact fatigue before use to make rail
Energy.The present inventor further study show that, in order to obtain the gauge angle of globular pearlite tissue, can be in the life of rail
Post-partum period carries out special heat treatment, such as first quick cooling, then gauge angular position is quickly heated and is incubated, can
Make at gauge angle, to generate globular pearlite tissue.The rail that the method for the present invention obtains has excellent intensity, wearability concurrently and resists
Contact fatigue property.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the area schematic at the gauge angle of passenger-cargo mixed utilization rail that the present invention provides.
Fig. 2 is the scanning of the globular pearlite tissue at the according to embodiments of the present invention 1 gauge angle of passenger-cargo mixed utilization rail
Electron microscope.
Fig. 3 is the test point schematic diagram of the hardness test of rail head matrix of passenger-cargo mixed utilization rail that the present invention provides.
Fig. 4 is the test point schematic diagram of the hardness test at gauge angle of passenger-cargo mixed utilization rail that the present invention provides.
Fig. 5 is the heating region schematic diagram of the rapid heating process of passenger-cargo mixed utilization rail that the present invention provides.
Description of reference numerals
The test position of the region A1 rail head matrix hardness at 1 gauge angle
The test position of the test position C1 gauge angle hardness of B1 gauge angle hardness
Specific embodiment
Hereinafter the specific embodiment of the present invention is described in detail.It should be appreciated that it is described herein concrete
Embodiment is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention provides a kind of passenger-cargo mixed utilization rail, the gauge angle of this passenger-cargo mixed utilization rail is by globular pearlite group
It is configured to, the thickness at described gauge angle 1 is 3-5mm, and hardness is 311-350HB, and elongation percentage is 12.5-16%, as shown in Figure 1.
Preferably, the thickness at the gauge angle 1 of described passenger-cargo mixed utilization rail is 3.5-4.7mm, and hardness is 320-340HB,
Elongation percentage is 13.4-15.3%；Preferably, the width at the gauge angle 1 of described passenger-cargo mixed utilization rail is 18-22mm.
In the present invention, the assay method of the thickness at described gauge angle 1 is etching pit method, and the assay method of hardness is
GB/T231.1, the assay method of elongation percentage is GB/T228.1.As shown in figure 4, the hardness test point B1 at the gauge angle 1 of rail and
The intermediate point of substantially in-orbit elongation 1 thickness in the position of C1.
In the present invention, the position at described gauge angle 1 is applied to the position at gauge angle generally in the art, described gauge angle
1 border is defined by metallographic structure, the tool at the gauge angle that metallographic structure is the present invention for the part that globular pearlite is organized
Body position, as shown in the dash area of reference 1 indication in Fig. 1.Rail head in the present invention, web of the rail etc. describe rail position
Word is all applied to definition generally in the art.Heretofore described rail head matrix refers to rail head in addition to gauge angle 1
Part.
According to the passenger-cargo mixed utilization rail of the present invention, other portions in addition to gauge angle 1 of described passenger-cargo mixed utilization rail
Position is preferably by lamellar pearlite organizational composition.The gold at other positions in addition to gauge angle 1 for the passenger-cargo mixed utilization rail of the present invention
Phase constitution allows during producing containing other nonmetallic inclusion payment organizations a small amount of, disclosure satisfy that industry to rail property
Basic demand can it is preferable that lamellar pearlite tissue account for 95% of the metallographic structure at other positions in addition to gauge angle 1 with
On, preferably account for more than 99.5%.The metallographic structure at other positions in addition to gauge angle 1 for the heavy haul railway rail of the present invention is permitted
Permitted to contain a small amount of ferrite it is preferable that ferrite accounts for 1.0 weights of the metallographic structure at other positions in addition to gauge angle 1
Amount below %.
According to the passenger-cargo mixed utilization rail of the present invention, the rail head base in addition to gauge angle 1 of described passenger-cargo mixed utilization rail
The hardness of body is 341-380HB, and elongation percentage is 10.0-13.0%.The assay method of the hardness of described rail head matrix is GB/
T231.1, the assay method of elongation percentage is GB/T228.1.As shown in figure 3, the position of the hardness test point A1 at the gauge angle 1 of rail
Put the position of depth about 10mm substantially on rail head axis.
The passenger-cargo mixed rail type with rail of the present invention is preferably 60kg/m.
According to the passenger-cargo mixed utilization rail of the present invention, on the basis of the gross weight of described passenger-cargo mixed utilization rail, described visitor
Goods mix with rail can the carbon containing 0.71-0.78 weight %, the silicon of 0.3-0.8 weight %, the manganese of 0.8-1.1 weight %,
Sulfur below phosphorus below the chromium of 0.1-0.3 weight %, the vanadium of 0.04-0.2 weight %, 0.025 weight %, 0.025 weight %
Ferrum with 96.77-98.05 weight %.
Preferably, on the basis of the gross weight of described passenger-cargo mixed utilization rail, described passenger-cargo mixed utilization rail can contain
The carbon of 0.72-0.77 weight %, the silicon of 0.38-0.70 weight %, the manganese of 0.90-1.06 weight %, 0.15-0.24 weight %
Sulfur below phosphorus below chromium, the vanadium of 0.08-0.14 weight %, 0.020 weight %, 0.016 weight %, 97.06-97.77 weight
The ferrum of amount %.
The reason rail main chemical elements of the present invention are limited in above range is below described.
Carbon (C) is that rail obtains good obdurability coupling and the most important element of comprehensive mechanical property.When the content of carbon is low
It is impossible to give full play to strengthening effect when 0.71 weight %, lead to rail strong hardness too low, and then the carbonization in steel cannot be ensured
Thing ratio and abrasion resistance properties；When the content of carbon is higher than 0.78 weight %, under technique of the present invention, the intensity index of steel
Too high and toughness plasticity is too low, lead to the appreciable impact fatigue behaviour because carbide proportion is too high, be unfavorable for the use safety of rail
Property.The present inventor finds in process of the test, and the content of carbon can reach preferably comprehensive for 0.72-0.77 weight %
Performance.
The Main Function of silicon (Si) is deoxidation and improves intensity.When the content of silicon is less than 0.3 weight %, one side solid solution
Amount is low to be led to strengthen DeGrain, when the content of silicon is higher than 0.8 weight %, will reduce plasticity.
Manganese (Mn) is that to improve intensity requisite.The present inventor's research finds, when the content of manganese is less than 0.8 weight
It is difficult to reach the effect increasing carbide hardness during amount %；When the content of manganese is higher than 1.1 weight %, carbide much higher hard,
The anti-fatigue performance of rail significantly reduces.Therefore, the content of described manganese is 0.8-1.1 weight %.
Chromium (Cr) can form multiple carbides as the carbon in medium carbide former, with steel；Meanwhile, chromium can be uniformly
Distribution of carbides in steel, reduces carbide size, improves the abrasion resistance properties of rail.When chromium content is less than 0.1 weight %, shape
The carbide hardness becoming and ratio are relatively low；When chromium content is higher than 0.3 weight %, in steel, martensite occurrence probability will significantly improve,
The safety of the military service of rail is difficult to ensure.Therefore, the content of described chromium is 0.1-0.3 weight %.
Vanadium (V) as the carbide formers of steel grade, can significantly strengthen the cementite intensity improving in pearlite, hardness and resistance to
Mill property, but too high content of vanadium can reduce plasticity and the toughness of rail.Therefore, the content of described vanadium is 0.04-0.2 weight
Amount %.
P and ses are impurity elements.When phosphorus content more than 0.025 weight % and/or sulfur content more than 0.025 weight
During amount %, plasticity and toughness are all deteriorated, and therefore the upper limit of p and ses is all 0.025 weight %.
Present invention also offers a kind of method of the passenger-cargo mixed utilization rail producing the present invention, the method includes：By finish to gauge
Rail afterwards is quickly cooled down, and then gauge angular position is quickly heated and is incubated；The condition of quick cooling includes：Open
Cold temperature is 800-880 DEG C, and rate of cooling is 2-6 DEG C/s, and final cooling temperature is 430-470 DEG C；The quick condition heating and being incubated
Including：With the programming rate of 3.0-4.0 DEG C/s, gauge angle temperature is increased to 700-800 DEG C and is incubated 2-4min.
In the methods described that the present invention provides, described quick cooling procedure is also referred to as heat treatment process.Cool down quick
During, for the rail of 60kg/m rail type, due to higher to the performance requirement of its matrix, and the component system in the present invention
Under, need just to enable to have the rail of high intensity, high-wearing feature and high anti-contact fatigue concurrently by the way of quick cooling.Quickly
The speed of cooling may be controlled to 2-6 DEG C/s, preferably 3.3-5.2 DEG C/s；Meanwhile, for ensureing that the temperature after quick cooling can not
Too low, it is opened cold temperature control and is 800 DEG C -880 DEG C, preferably 820-860 DEG C, simultaneously for ensureing follow-up natural cooling process
More smoothly, the temperature of described quick cooling procedure can not be too low, requires the temperature control after its quick cooling to exist in the present invention
More than 430 DEG C for example, 430-470 DEG C, preferably 440-460 DEG C.In order to ensure higher open cold temperature, should after finish to gauge,
Promptly quickly cooled down, thus eliminating the popular drama crop operation carrying out after finish to gauge of routine.Herein, quick cooling
Roller transport speed be preferably 4-5m/s, the medium of quick cooling can be cooling medium commonly used in the art, for example
Can be at least one in compressed air and gas-vapor mix.
The present inventor have passed through numerous studies it was found that the metallographic structure at gauge angle 1 in order to realize the present invention
For globular pearlite tissue, immediately gauge angle 1 position can quickly be heated and is incubated after above-mentioned quick cooling,
The quick condition heating and being incubated includes：With the programming rate of 3.0-4.0 DEG C/s, gauge angle 1 temperature is increased to 700-800 DEG C
And it is incubated 2-4min；Preferably, with the programming rate of 3.2-3.8 DEG C/s, gauge angle 1 temperature is increased to 710-790 DEG C and is incubated
2-4min.
In accordance with the present production process it is preferable that the mode of described quick heating heats for flame；Flame heating is used
Fuel gas can be various conventional fuel gas, for example, H2、C2H2And CH4One or more of, preferably H2、
C2H2And CH4The mixing of three kinds of gases.Preferably, H2、C2H2And CH4The ratio of three kinds of gases is 1：1-2：3-5.In order that it is flammable
Gas fully discharges heat, and described fuel gas can be properly selected according to the composition of fuel gas with the volume ratio of oxygen,
Preferably, when fuel gas is H2、C2H2And CH4One or more of when, the volume ratio of fuel gas and oxygen is 1：1.5-
5, more preferably 1：2-4.
In accordance with the present production process, described insulation refers to gauge angle 1 is incubated, and specific method is permissible
For：When gauge angle 1 is quickly heated reach temperature required after, by adjusting the flow-control temperature of fuel gas and oxygen
Degree, makes gauge angle 1 realize insulation.
In accordance with the present production process, the schematic diagram of described flame heating is as shown in figure 5, flame direction should be substantially vertical
In the cambered surface at gauge angle 1, and flame region substantially should just cover the region at gauge angle 1, when fuel gas is H2、C2H2With
CH4During one or more of three kinds of gaseous mixture, burner is more suitable during 6-10mm with the distance at gauge angle 1.
In the present invention, finish to gauge and its step before are carried out to rail, and rail is quickly cooled down, quickly adds
Step after heat and insulation can be all the step of the conventional rail that can obtain lamellar pearlite tissue in this area.Example
As the complete Rail Production technique of the present invention can be：At the first blast furnace vanadium-bearing hot metal carrying out this area routine successively, vanadium extraction
Reason, molten iron pre-desulfurization, converter smelting, LF stove+RH stove refine, six stream bloom protection continuous castings, stepped heating and 7 frames are omnipotent
Rolling mill practice, obtains the rail after finish to gauge, then carries out quick cooling, quick heating and the heat preservation method of the present invention, afterwards will
The rail obtaining carries out the conventional walking beam cooler in this area, flat, vertical compound straightening, ultrasound examination, cross dimensions successively, puts down
The detection of straight degree, combined saw brill+scale, surface inspection and warehouse-in.
In accordance with the present production process, passenger-cargo mixed rail type with rail is preferably 60kg/m.
According to the passenger-cargo mixed utilization rail of the present invention, on the basis of the gross weight of described passenger-cargo mixed utilization rail, described passenger-cargo
Mixing can be with the carbon of 0.71-0.78 weight %, the silicon of 0.3-0.8 weight %, the manganese of 0.8-1.1 weight %, 0.1-0.3 with rail
Sulfur below phosphorus below the chromium of weight %, the vanadium of 0.04-0.2 weight %, 0.025 weight %, 0.025 weight % and 96.77-
The ferrum of 98.05 weight %.
Preferably, on the basis of the gross weight of described passenger-cargo mixed utilization rail, described passenger-cargo mixed utilization rail can contain
The carbon of 0.72-0.77 weight %, the silicon of 0.38-0.70 weight %, the manganese of 0.90-1.06 weight %, 0.15-0.24 weight %
Sulfur below phosphorus below chromium, the vanadium of 0.08-0.14 weight %, 0.020 weight %, 0.016 weight %, 97.06-97.77 weight
The ferrum of amount %.
Invention additionally provides the present invention produces the passenger-cargo mixed utilization steel that the method production of passenger-cargo mixed utilization rail obtains
Rail.This is passenger-cargo mixed to have high intensity, high-wearing feature and high contacting fatigue resistance with rail, according to GB/T228.1 method pair
It carries out tensile strength RmTest understand, tensile strength R of the passenger-cargo mixed utilization rail of the present inventionmUp to 1250-1350MPa；
According to GB/T10622 method, it is carried out with the test of anti-contact fatigue to understand, the anti-contact of the passenger-cargo mixed utilization rail of the present invention
Fatigue behaviour can reach 26-29 ten thousand times；.
Hereinafter will be described the present invention by embodiment, but the scope of the present invention will be not limited to this.
Embodiment 1-5 rail from following numbering 1-5 chemical composition corresponding with comparative example 1-5, specific chemical composition is such as
Shown in table 1.
Table 1
Balance of Fe, residual elements and field trash.
Embodiment 1
Will be containing numbering in table 11 chemical composition steel through bessemerizing, be cast into continuous casting steel after LF refining, RH application of vacuum
Then steel billet is delivered to and is heated to 1300 DEG C in walking beam furnace and is incubated 3h by base, and billet rolling is 60kg/m rail type
Rail, is stood on the rail after finish to gauge on roller-way using double steel stand.Kun road is transported with the speed of 4.8m/s, using steam
Mixture is quickly cooled down to rail as cooling medium, controls the cold temperature of opening of quick cooling to be 860 DEG C, rate of cooling is
5.2 DEG C/s, final cooling temperature is 446 DEG C.After quick cooling, by H2、C2H2And CH4Three kinds of gas is with 1:1.5:4 volume ratio is mixed
Synthesis fuel gas, fuel gas is 1 with the volume ratio of oxygen:3, to gauge angle 1 part with flame heating (as shown in Figure 5)
Form is quickly heated.The programming rate controlling quick heating is 3.7 DEG C/s, when gauge angle 1 temperature is increased to 790 DEG C,
By controlling the flow of fuel gas and oxygen, gauge angle 1 is made to be incubated about 2.5min, the distance at burner and gauge angle 1 is in 6-
Adjust in 10mm.Then gained rail is sent into walking beam cooler to process, then sequentially pass through ultrasound examination, cross dimensions, put down
The detection of straight degree, combined saw brill+scale, surface inspection, final acquisition rail A1.
Embodiment 2-5 and comparative example 1-5
Embodiment 2-5 is according to the method for embodiment 1, and operating process control parameter is different from embodiment 1, concrete operations
As shown in table 2, the rail according to the preparation of embodiment 2-5 method is A2-A5 to range control parameter.Processing mode in comparative example and reality
Apply example except that, the step quickly heating and being incubated after quickly not cooled down, specific operation process control parameter
As shown in table 2, the rail according to the preparation of comparative example 1-5 method is D1-D5.
Table 2
Test case
According to following methods, performance detection is carried out to rail A1-A5 and D1-D5 of embodiment 1-5 and the preparation of comparative example 1-5,
Specifically：
The hardness at the rail head matrix for rail and gauge angle, thickness, elongation percentage and metallographic structure, are surveyed using following methods
, acquired results are as shown in table 3：
The method of testing of the hardness at rail head matrix and gauge angle all measures according to the method for GB/T231.1；Elongation percentage is all pressed
Method according to GB/T228.1 measures；Metallographic structure all measures according to the method for GB/T13299；The method of testing of gauge angle 1 thickness
For etching pit method；Wherein, the position of test point A1 of rail head matrix hardness (is located substantially on rail head axis depth about
The position of 10mm) as shown in figure 3, test point B1 of gauge angle 1 test hardness and the position of C1 (are located substantially at gauge angle 1 thickness
Intermediate point) as shown in Figure 4.TEM observation is carried out to gauge angle 1 position of the made rail of embodiment 1, result as shown in Fig. 2 from
The metallographic structure that Fig. 2 can be seen that gauge angle 1 position is the globular pearlite tissue being evenly distributed.
Tensile strength for rail and contacting fatigue resistance method of testing are as follows, and result is as shown in table 4：
Tensile strength RmMethod of testing be GB/T228.1；
The method of testing of anti-contact fatigue is GB/T10622, specially：Carry out steel in JPM-1B type contact fatigue test machine
Rail contact fatigue test, the rail head position of rail A1-A5 and D1-D5 taken from by sample, in all contact fatigue tests, lower grind away
Material all same, concrete test parameterss are as follows：
Specimen size：Thickness 20mm, the round sample of diameter 60mm,
Test load：200Kg,
Slippage：5%,
The lower sample material to mill：Hardness is the wheel steel of 280-320HB,
Environment：Atmospheric environment,
The speed of rotation：300 revs/min.
In addition, in the test process carrying out anti-contact fatigue, observing the wear phenomenon at rail gauge angle, and record in table
In 4.
Table 3
*, on the basis of the gross weight of rail head matrix, ferritic content is 0.4 weight %.
On the basis of the gross weight of rail head matrix, ferritic content is 0.3 weight % to *.
Table 4
The passenger-cargo mixed utilization steel that the method according to the invention prepares be can be seen that by comparing embodiment and comparative example
Rail have globular pearlite tissue gauge angular zone, and tensile strength and contacting fatigue resistance preferable；And according to contrast
The rail that the method for example prepares does not have the gauge angular zone that property is substantially distinguished, and tensile strength and anti-contact fatigue
Can be poor.
In addition, rail contact with wheel at the beginning of contacting points position in-orbit elongation region (1 position see in Fig. 1), due to
Now contact area is little leads to contact stress high, and the metal of contact area easily reaches its fatigue limit.Gauge according to table 4
Corner wear phenomenon, the gauge angle intensity of rail prepared by comparative example, hardness are high, and wear hardness is good, causes the metal of contact area not
Easily it is worn away and forms fatigue crack, extension, ultimately form and peel off block, so that the metal wear in rail contact area is accelerated；
And the gauge angle of rail prepared by the application will be worn before producing fatigue crack, such rail contact area does not result in
Fatigue, peel off block, finally improve the wear hardness of rail.
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 range of the technology design of the present invention, multiple simple variant can be carried out to technical scheme, this
A little simple variant belong to protection scope of the present invention.
Claims (8)
1. a kind of passenger-cargo mixed utilization rail, the gauge angle of this passenger-cargo mixed utilization rail is by globular pearlite organizational composition, described rail
The thickness of elongation be 3-5mm, hardness be 311-350HB, elongation percentage be 12.5-16%, described passenger-cargo mixed utilization rail except rail
Other positions beyond elongation by lamellar pearlite organizational composition, the rail head in addition to gauge angle of described passenger-cargo mixed utilization rail
The hardness of matrix is 341-380HB, and elongation percentage is 10.0-13.0%.
2. passenger-cargo mixed utilization rail according to claim 1, wherein, with the gross weight of described passenger-cargo mixed utilization rail as base
Standard, described passenger-cargo mixed contains the carbon of 0.71-0.78 weight %, the silicon of 0.3-0.8 weight %, 0.8-1.1 weight % with rail
Manganese, the chromium of 0.1-0.3 weight %, the vanadium of 0.04-0.2 weight %, the phosphorus below 0.025 weight %, below 0.025 weight %
Sulfur and 96.77-98.05 weight % ferrum.
3. a kind of method of the passenger-cargo mixed utilization rail producing described in claim 1 or 2, the method includes：By the steel after finish to gauge
Rail is quickly cooled down, and then gauge angular position is quickly heated and is incubated；The condition of quick cooling includes：Open cold temperature
For 800-880 DEG C, rate of cooling is 2-6 DEG C/s, and final cooling temperature is 430-470 DEG C；The quick condition heating and being incubated includes：With
Gauge angle temperature is increased to 700-800 DEG C and is incubated 2-4min by the programming rate of 3.0-4.0 DEG C/s.
4. method according to claim 3, wherein, the condition of quick cooling includes：Open cold temperature and be 820-860 DEG C, cold
But speed is 3.3-5.2 DEG C/s, and final cooling temperature is 440-460 DEG C；The quick condition heating and being incubated includes：With 3.2-3.8 DEG C/
Gauge angle temperature is increased to 710-790 DEG C and is incubated 2-4min by the programming rate of s.
5. the method according to claim 3 or 4, wherein, described quick heating is carried out by way of flame heats.
6. method according to claim 5, wherein, described flame heating fuel gas used with the volume ratio of oxygen is
1：1.5-5.
7. method according to claim 6, wherein, described fuel gas is selected from H2、C2H2And CH4One or more of.
8. the passenger-cargo mixed utilization rail that the method production described in any one in claim 3-7 obtains.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063916A (en) * | 1990-07-30 | 1992-08-26 | 伯林顿北方铁道公司 | High-strength, damage-resistant rail and manufacture method thereof |
| CN101743334A (en) * | 2007-10-10 | 2010-06-16 | 杰富意钢铁株式会社 | Internal high hardness type pearlitic rail with excellent wear resistance, rolling contact fatigue resistance, and delayed fracture property and method for producing same |
| CN104087836A (en) * | 2014-08-06 | 2014-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-chromium micro-alloyed superfine pearlite steel rail |
| CN104120354A (en) * | 2014-08-11 | 2014-10-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel rail with excellent contact fatigue performance and production method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2734980C (en) * | 2008-10-31 | 2014-10-21 | Nippon Steel Corporation | Pearlite rail having superior abrasion resistance and excellent toughness |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063916A (en) * | 1990-07-30 | 1992-08-26 | 伯林顿北方铁道公司 | High-strength, damage-resistant rail and manufacture method thereof |
| CN101743334A (en) * | 2007-10-10 | 2010-06-16 | 杰富意钢铁株式会社 | Internal high hardness type pearlitic rail with excellent wear resistance, rolling contact fatigue resistance, and delayed fracture property and method for producing same |
| CN104087836A (en) * | 2014-08-06 | 2014-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-chromium micro-alloyed superfine pearlite steel rail |
| CN104120354A (en) * | 2014-08-11 | 2014-10-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel rail with excellent contact fatigue performance and production method thereof |
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