CN106435367B - A kind of bainite rail and preparation method thereof - Google Patents
A kind of bainite rail and preparation method thereof Download PDFInfo
- Publication number
- CN106435367B CN106435367B CN201611036574.XA CN201611036574A CN106435367B CN 106435367 B CN106435367 B CN 106435367B CN 201611036574 A CN201611036574 A CN 201611036574A CN 106435367 B CN106435367 B CN 106435367B
- Authority
- CN
- China
- Prior art keywords
- weight
- rail
- bainite
- content
- steel billet
- 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.)
- Active
Links
Classifications
-
- 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
- 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
- C22C38/04—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
- C22C38/12—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
- 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
- C21D2211/001—Austenite
-
- 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
-
- 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
- C21D2211/008—Martensite
Abstract
The present invention relates to rail material fields, disclose a kind of bainite rail and preparation method thereof.Wherein, on the basis of the weight of the bainite rail, it is 0.3 0.8 μm that the content of bainite ferrite slip on the rail head of the bainite rail in the microscopic structure at fillet position, which is more than or equal to 90 weight % and the width of the bainite ferrite slip, the content of film-form retained austenite is less than or equal to 5 weight % and the width of the film-form retained austenite is less than 0.1 μm, the content of martensite is less than or equal to 5 weight %, and obtaining the chemical composition of steel billet of the bainite rail, it is necessary to meet following condition：On the basis of the weight of the steel billet, the steel billet contains the C of 0.20 0.30 weight %, the Si of 1.40 1.60 weight %, the Mn of 1.85 2.05 weight %, the Cr of 1.00% 1.25 weight %, the Mo of 0.30% 0.50 weight %, the V of 0.07% 0.09 weight %, and meet the weight % of 3.1 weight %≤Mn+Cr≤3.3.The bainite rail has excellent toughness and tenacity and service safety.
Description
Technical field
The present invention relates to rail materials, and in particular, to a kind of bainite rail and preparation method thereof.
Background technology
The axis weight of railway and the continuous promotion of freight volume, propose the military service performance of rail requirements at the higher level, and annual traffic is more than 2
Hundred million tons of heavy haul railway particularly small curve radius section has become the severely afflicated area of rail defects and failures, and rail service life is usually not more than
3 years are spent, part line condition harshness section is even less than 1 year, is difficult to adjacent straightway and sweeping curve section
Match, rail is frequently replaced and maintenance of way cost and the labor intensity of worker is not only significantly increased, while hurt fast development is to row
Vehicle also brings hidden trouble safely.The rail of conventional pearlitic material after the development of more than 100 years, performance close to the limit, if
Further improving the comprehensive performance of rail then needs bainite structure to realize.
Correlative study at present applied to the bainitic steel in rail field is more deep, such as CN105385938A is announced
The heat treatment method and bainite rail of a kind of alloy system and its bainite rail, employ following chemical composition (matter
Measure percentage)：0.22%-0.27%C, 1.65%-1.85%Si, 1.60%-1.80%Mn, 1.30%-1.90%Cr,
0.25%-0.85%Mo, 0.25%-0.95%Ni, 0.04%-0.06%V or 0.02%-0.04%Nb, surplus is for Fe and not
Evitable impurity.Meanwhile clear stipulaties are also carried out to the impurity element in steel and elemental gas content：P≤0.015%, S
≤ 0.015%, strand [H]≤1.5ppm, [O]≤25ppm, [N]≤70ppm, Al≤0.006%, Cu≤0.15%, Sn≤
0.010%th, Sb≤0.010%.Rail is handled after rolling using normalizing+adjustment：During 900-940 DEG C of austenitizing heat preservation of normalizing temperature
Between come out of the stove after ＞ 8h and be air-cooled to room temperature；After the range inside holding 7h of Ac3+50~70 DEG C, direct water-cooling is quenched to martensitic traoformation
Between 320-350 DEG C of temperature more than；Then rail stacking is put into isothermal holding in holding pit, soaking time at 320-350 DEG C
＞ 5h；Finally, continue to be air-cooled to room temperature, and then obtain finished product after 320-370 DEG C of range inside holding ＞ 9h carries out temper
Rail.Rail using this method production has excellent tough comprehensive performance.Research shows that the production method is although to rail
Performance it is beneficial, but such as Ni, V, Nb content of the alloying element in steel is higher, and the production cost of rail is caused to be significantly increased；Meanwhile
Water hardening is employed in subsequent processing steps, since rail particularly rail head position surface layer and center portion cooling rate are different, will be led
Deflection of rail is caused, residual stress is significantly increased, refers to even if by that can not obtain ideal stress follow-up isothermal and temper
Mark；Further, since it is shown using a normalizing, primary quenching, an isothermal processes and a temper, the production cycle of rail
It writes extension and Energy Consumption Cost increases.
Invention content
The object of the present invention is to provide a kind of bainite rails and preparation method thereof.The bainite rail has excellent strong
Tough performance kimonos uses as a servant safety, suitable for big axis weight, high density heavy haul railway small curve radius section and line condition complexity road
Section.
To achieve these goals, the present invention provides a kind of bainite rail, wherein, using the weight of the bainite rail as
Benchmark, the content of the bainite ferrite slip on the rail head of the bainite rail in the microscopic structure at fillet position are more than or equal to
The width of 90 weight % and the bainite ferrite slip is 0.3-0.8 μm, and the content of film-form retained austenite is less than etc.
It is less than 0.1 μm in 5 weight % and the width of the film-form retained austenite, the content of martensite is less than or equal to 5 weight %,
Obtaining the chemical composition of the steel billet of the bainite rail, it is necessary to meet following condition：Using the weight of the steel billet as
Benchmark, the steel billet contain the C of 0.20-0.30 weight %, the Si of 1.40-1.60 weight %, the Mn of 1.85-2.05 weight %,
The Cr of 1.00%-1.25 weight %, the Mo of 0.30%-0.50 weight %, the V of 0.07%-0.09 weight %, and meet 3.1 weights
Measure the weight % of %≤Mn+Cr≤3.3.
The present inventor has found that influence rail military service safety mainly includes following factor under study for action：First, shellfish
The content of retained austenite and the content of martensitic structure in family name's body rail microscopic structure；Retained austenite is sub- at room temperature
Steady phase will change under applied stress or temperature action to more stable martensitic structure, and martensitic structure belongs to brittleness group
It knits, the easy crack initiation under wheel track multiaxial stress repeated action easily leads to rail after crackle extends further to critical length
Brittle failure jeopardizes traffic safety.Therefore, the content of martensitic structure in rail is reduced to rail brittle failure is avoided to have notable benefit.So
And the rail that room temperature is air-cooled to after rolling will inevitably obtain martensitic structure.Therefore, if being reduced to room in rail temperature
Isothermal processes are carried out before warm, makes to form the region acquisition bainite structure as much as possible of martensite originally, then can effectively solve
The content problem of martensitic structure.At the same time, to the retained austenite that is formed in steel also should by the adjustment of ingredient and technique,
It made to obtain film-form as far as possible and be the rich higher metastable phase of carbon degree, at this time outside plus under stress to martensitic structure
The probability and ability of transformation will be greatly reduced；By retained austenite and the Collaborative Control of martensitic structure, steel can be effectively improved
The service safety of rail.Second is that the residual stress of rail.Research shows that rail through roll with aligning after, rail head and flange of rail position
Distribution tensile stress, web of the rail position are compression, when rail residual stress is larger, since web of the rail thickness is small, belongs to rail and break entirely
The more weak position in face, is also easy to produce piped rail, serious crisis traffic safety under rail head, flange of rail stress.Although steel
Rail bainite rail has higher fracture toughness and relatively low crack growth rate, but evidence there is no to show that it can at present
Offset the illeffects of larger residual stress.Therefore, the residual stress for reducing rail is that bainite rail needs asking for emphasis solution
Topic.The present invention, not only can be with by the Collaborative Control of bainite ferrite slip, film-form retained austenite and martensitic structure
The bainite rail with excellent toughness and tenacity is obtained, also can reach the effect for reducing residual stress.
The present invention also provides the preparation method of above-mentioned bainite rail, this method includes：By the steel billet after isothermal holding
Rolling waste heat rail is carried out, treats that the tread center of waste heat rail is cooled to the central temperature of rail head tread and is in air
After 350-370 DEG C, gained waste heat rail is placed at 375-405 DEG C and is tempered 4-8h, is then cooled to room temperature in air.
Bainite rail provided by the invention has excellent toughness and tenacity, also, compared to roller repairing to room temperature
Rail can at least reduce by 10%, i.e., bainitic steel provided by the invention using the rail flange of rail center residual stress of isothermal processes
Rail also has excellent service safety.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention, but be not construed as limiting the invention together.In the accompanying drawings：
Fig. 1 is that fillet position is observed under transmission electron microscope and obtained on the rail head of the bainite rail of the embodiment of the present invention 1
A visual field micro-structure diagram.
Specific embodiment
The specific embodiment of the present invention is described in detail below.It is it should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood to comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It between the endpoint value of a range and individual point value and can be individually combined with each other between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
According to the first aspect of the invention, the present invention provides a kind of bainite rail, wherein, with the bainite rail
On the basis of weight, the content of the bainite ferrite slip on the rail head of the bainite rail in the microscopic structure at fillet position is big
In equal to the width of 90 weight % and the bainite ferrite slip be 0.3-0.8 μm, the content of film-form retained austenite
It is less than 0.1 μm less than or equal to 5 weight % and the width of the film-form retained austenite, the content of martensite is less than or equal to 5 weights
Measure %,
Obtaining the chemical composition of the steel billet of the bainite rail, it is necessary to meet following condition：Using the weight of the steel billet as
Benchmark, the steel billet contain the C of 0.20-0.30 weight %, the Si of 1.40-1.60 weight %, the Mn of 1.85-2.05 weight %,
The Cr of 1.00%-1.25 weight %, the Mo of 0.30%-0.50 weight %, the V of 0.07%-0.09 weight %, and meet 3.1 weights
Measure the weight % of %≤Mn+Cr≤3.3.
In order to which film-form retained austenite in bainite rail and martensitic structure is made preferably to play synergistic effect and make
Bainite rail has more excellent toughness and tenacity and service safety, under preferable case, with the weight of the bainite rail
On the basis of, the content of the bainite ferrite slip is 91-95 weight %, and the content of film-form retained austenite is 2-5 weights
% is measured, the content of martensite is 2-5 weight %.
In order to obtain the chemical composition of the steel billet materials of above-mentioned bainite rail, it is necessary to meet following condition, with the steel billet
Weight on the basis of, the steel billet contains the C of 0.20-0.30 weight %, the Si of 1.40-1.60 weight %, 1.85-2.05 weight
Mn, the Cr of 1.00%-1.25 weight %, the Mo of 0.30%-0.50 weight %, the V of 0.07%-0.09 weight % of % is measured, it is remaining
It measures as Fe and inevitable impurity, and meets the weight % of 3.1 weight %≤Mn+Cr≤3.3.
Under preferable case, the steel billet further includes P and S, and on the basis of the weight of the steel billet, the content of the P is
The content of 0.010-0.016 weight %, the S are 0.001-0.005 weight %.
Illustrate the reason of content of steel billet main chemical elements of the present invention is limited to above range below.
Carbon (C) is that bainitic steel obtains good obdurability matching and the most important element of comprehensive mechanical property.When containing for carbon
When amount is less than 0.20 weight %, invigoration effect is unable to give full play, the strong hardness for leading to rail is too low, can not meet fully loaded transportation condition
Under military service performance；When carbon content be less than 0.30 weight % when, under the method for the invention, the intensity index of steel it is excessively high and
Toughness plasticity is too low, is unfavorable for the safety in utilization of rail.Therefore, the content of carbon is defined to 0.20-0.30 weight % by the present invention.
Silicon (Si) is usually present in solution in ferrite as the main adding elements in steel, can improve tissue
Intensity.When the content of silicon is less than 1.40 weight %, for bainitic steel, one side solid solution capacity is relatively low to cause reinforcing effect unknown
It is aobvious, it on the other hand will be unable to effectively inhibit Carbide Precipitation, obtain film-form residual austenite body tissue, and then this hair can not be obtained
The bright bainitic steel with specific organization, it is impossible to achieve the object of the present invention；It, will when the content of silicon is higher than 1.60 weight %
Fully inhibit the precipitation of carbide, instead more retained austenite occurs, while is also easy to produce surface defect, can not ensure to arrange
The ride comfort of vehicle operation.Therefore, the content of silicon is defined to 1.40-1.60 weight % by the present invention.
Manganese (Mn) can significantly reduce bainite structure and start transition temperature, be the bainite that refinement is obtained in bainitic steel
The important addition element of ferrite slip.When the content of manganese is less than 1.85 weight %, the positive effect of bainitic steel is difficult to
Reach；When the content of manganese is higher than 2.05 weight %, the segregation of rail will be increased and martensitic structure is not under room temperature
Profit, the fatigue behaviour and service safety of rail can significantly reduce.Therefore, the content of manganese is defined to 1.85- by the present invention
2.05 weight %.
Formation element of the chromium (Cr) as medium carbide, a variety of carbide can be formed with the carbon in steel；Meanwhile chromium can be
The distribution of carbide in even steel reduces carbide size, so as to improve the abrasion resistance properties of rail.When the content of chromium is less than 1.00
During weight %, the carbide hardness and ratio of formation are relatively low, and are assembled with sheet form, are unfavorable for improving the wear resistance of rail
It can be reduced with toughness；When the content of chromium is higher than 1.25 weight %, ratio of martensite will significantly improve in steel, the military service of rail
Safety is difficult to ensure.Therefore, the content of chromium is defined to 1.00-1.25 weight % by the present invention.
Molybdenum (Mo) has extremely significant effect for reducing the beginning transition temperature of hot rolling and air cooling condition lower bainite tissue
Fruit, and be conducive to stablize and strengthen bainite structure.When the content of molybdenum is less than 0.30 weight %, it is difficult to reach above-mentioned effect
Fruit；When the content of molybdenum is higher than 0.50 weight %, bainite structure transformation efficiency will significantly reduce, and can not obtain in cooling procedure
Obtain ideal bainite structure.Therefore, the content of molybdenum is defined to 0.30-0.50 weight % by the present invention.
Vanadium (V), which is added to as grain refining element in steel, can further refine bainite ferrite slip, synchronous to improve
The strong hardness of rail and toughness plasticity index.When the content of vanadium is less than 0.07 weight %, grain refining effect is not notable, rail
Tough comprehensive performance is relatively low；When the content of vanadium is higher than 0.09 weight %, the impact flexibility of rail will be deteriorated, be unfavorable for rail and obtain
Obtain higher contact resistance fatigue behaviour.Therefore, the content of vanadium is defined to 0.07-0.09 weight %.
To ensure that bainite rail of the present invention obtains performance of being more preferably on active service, the inventors found that obtaining
The weight percent of Mn+Cr in the steel billet of the bainite rail need to meet the weight % of 3.1 weight %≤Mn+Cr≤3.3.It is former
Because being, Mn and Cr play the role of in bainitic steel it is similar, under the conditions of air-cooled after rolling, as 3.1 weight % of Mn+Cr ＜, steel
Middle bainite ferrite slip ratio is greatly reduced less than 90 weight %, the toughness plasticity index of rail；When 3.3 weights of Mn+Cr ＞
When measuring %, on the other hand one side rail excessive high hardness will lead to rail part macrosegregation, it is difficult to ensure bainite in rail
The uniformity of tissue and performance.Therefore, the weight percent of Mn+Cr is defined to 3.1 weight %≤Mn+Cr≤3.3 by the present invention
Weight %.
Above-mentioned bainite rail provided by the invention with specific organization is with good obdurability and excellent safety
Military service.
According to the second aspect of the invention, the present invention also provides the preparation method of above-mentioned bainite rail, this method packets
It includes：Steel billet after isothermal holding is subjected to rolling waste heat rail, treats that the tread center of waste heat rail is cooled in air
After the central temperature of rail head tread is 350-370 DEG C, gained waste heat rail is placed at 375-405 DEG C and is tempered 4-8h, Ran Hou
It is cooled to room temperature in air.
According to the method for the present invention, on the basis of the weight of the steel billet, the steel billet contains 0.20-0.30 weight %'s
The Si of C, 1.40-1.60 weight %, the Mn of 1.85-2.05 weight %, the Cr of 1.00%-1.25 weight %, 0.30%-0.50 weight
Mo, the V of 0.07%-0.09 weight % of % is measured, and meets the weight % of 3.1 weight %≤Mn+Cr≤3.3.
According to the method for the present invention, the steel billet of above-mentioned composition can be obtained, such as will contain by the conventional method of this field
There is the molten steel of above-mentioned chemical composition through converter or electric furnace smelting, LF stoves refine, continuous casting is certain section after RH or VD vacuum processings
Then the continuous casting billet of size send into walking beam furnace the continuous casting billet to heating and thermal insulation, be required section by billet rolling
Waste heat rail.
According to the method for the present invention, the heat-retaining condition is subject to heating steel billet to the temperature for being suitable for rolling, such as will
Heating steel billet is to 1200-1300 DEG C and keeps the temperature more than 3h, and under preferable case, to 1200-1300 DEG C and heating steel billet kept the temperature 3-
5h。
Method according to the invention it is possible to the steel billet after the isothermal holding is rolled using pass method or omnipotent method
Obtain waste heat rail.To the condition of the rolling, there is no particular limitation, under preferable case, is into substance by above-mentioned billet rolling
The section steel rail of 43-75kg/m.
According to the method for the present invention, after the rolling, the waste heat rail is placed in air and is cooled down, when waste heat rail
After the central temperature that tread center is cooled to rail head tread in air is 350-370 DEG C, gained waste heat rail is placed in 375-
4-8h is tempered at 405 DEG C.
When gained waste heat rail tempering temperature higher than 405 DEG C, rail temperature is close to Transition of Brittleness area temperature, steel at this time
Cooling rate of the rail in tempering furnace is far below in air, causes rail long in 405 DEG C or more of temperature residence time, rail
Intensity and impact flexibility will be greatly reduced.Microscopic structure inspection also confirms that, should retain originally to the piece strip bainite of room temperature
There is polygonization trend at this time in ferrite；If the temperature of gained waste heat rail is less than 375 DEG C, rail is in temper
After when continuing to be cooled to room temperature, form the 5 weight % of content ＞ of martensitic structure；Meanwhile the toughness plasticity index of rail is promoted not
Significantly, it is unfavorable for obtaining the bainite rail of function admirable.
When tempering time is less than 4h, the rail head position temper of rail is insufficient, the military service performance-sensitive of rail；When
Tempering time is higher than 8h, and Carbide Precipitation is completed in steel, and tempering process purpose has reached, and continues to extend processing time without significantly
Benefit.
After temper, rail is taken out into cooling in air and obtains finished product bainite rail.
Therefore, according to the method for the present invention, when the central temperature of the rail head tread of waste heat rail is down to 350-370 DEG C,
Rail is placed in 375-405 DEG C of tempering 4-8h.
It, will under preferable case in order to which the bainite rail of preparation is made to obtain more excellent obdurability and military service security performance
Gained waste heat rail is tempered 5-7 hours at 385-392 DEG C.
It is stood in air in the roller-way of the invention that waste heat rail is preferably stood on to continuous operation by double steel rack cold
But.
According to the method for the present invention, the device of the tempering, which may be used, commonly used in the art various can play tempering
The device of effect, such as tempering furnace.
In the present invention, temperature is measured using infrared radiation thermometer.
The present invention will be described in detail by way of examples below.
The chemical composition and content contained in the steel billet used in the embodiment of the present invention A1-A6 and comparative example D1-D3
As shown in table 1 below, remaining is Fe and inevitable impurity.
Table 1
Embodiment 1-6
Embodiment 1-6 is used for the preparation method for illustrating bainite rail provided by the invention.
The A1-A6 steel billets in table 1 are being cast into certain break after converter smelting, the refining of LF stoves, RH application of vacuum respectively
It after the continuous casting billet of face size, send and 1250 DEG C is heated into walking beam furnace, keep the temperature 4h, be the disconnected of 60kg/m by billet rolling
Face rail, gained waste heat rail is stood on after roller-way stand in air it is air-cooled, when waste heat rail tread central temperature drop
Into table 2 when rolling rear air-cooled final temperature, rail is placed in tempering furnace is tempered rapidly, temperature and time are shown in Table 2, after
Taking-up continues to be air-cooled to room temperature.
Comparative example 1-3
According to the method for embodiment 1, unlike comparative example 1-3 in the steel billet that uses such as table 1, the temperature in preparation process
Degree control is referring to table 2.
Table 2
Test case
Performance detection is carried out to rail A1-A6 and D1-D3 prepared by embodiment 1-6 and comparative example 1-3 according to following methods,
Specifically：
By GB/T228.1-2010《Metal material tensile testing at ambient temperature》The tensile property of rail is measured, is measured
Rp0.2 (yield strength), Rm(tensile strength), A% (elongation), Z% (contraction percentage of area) are as shown in table 3；
Measure the impact property of rail by GB/T-229/2007 methods, rail at the room temperature (25 DEG C) of measure and 0 DEG C
Aku (ballistic work) is referring to table 3；
The flange of rail center residual stress of rail is measured by TB/T-2344/2012 methods, measurement result is shown in Table 3；
By GB/T 13298-1991《The metal microstructure method of inspection》Using TECNAL-G 2-20 transmissioning electric mirror determinings
The microscopic structure of rail A1, as a result referring to Fig. 1；
The content of bainite ferrite slip and martensite is measured according to GB/T 13298-1991 methods, using XRD diffraction
Method measures the content of film-form retained austenite；And bainite ferrite slip and the width of film-form retained austenite lead to
It crosses using transmission electron microscope, chooses at least 200 visual fields, measure its width average value, measurement result is shown in Table 3.
Table 1 to table 3 the result shows that, the content that method using the present invention can obtain bainite ferrite slip is more than
Equal to 90 weight % and slip width significantly refines while bayesian of the content of retained austenite and martensite no more than 5%
Body fine structure, bainite rail provided by the invention is while high intensity is obtained, toughness plasticity index particularly impact flexibility
The corresponding technical indicator being apparently higher than in comparative example；Meanwhile the flange of rail center residual stress of bainite rail significantly lower than pair
Corresponding technical indicator in ratio, it is therefore seen that, bainite rail provided by the invention have more excellent military service performance and
Security performance.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail, within the scope of the technical concept of the present invention, a variety of simple variants can be carried out to technical scheme of the present invention, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (4)
1. a kind of bainite rail, which is characterized in that on the basis of the weight of the bainite rail, the rail head of the bainite rail
The content of bainite ferrite slip in the microscopic structure at upper fillet position is more than or equal to 90 weight % and the bainite iron
The width of ferritic slip is 0.3-0.8 μm, and the content of film-form retained austenite is less than or equal to 5 weight % and the film-form is residual
The width of remaining austenite is less than 0.1 μm, and the content of martensite is less than or equal to 5 weight %,
Obtaining the chemical composition of the steel billet of the bainite rail, it is necessary to meet following condition：Using the weight of the steel billet as base
Standard, the steel billet contain the C of 0.20-0.30 weight %, the Si of 1.40-1.60 weight %, the Mn of 1.85-2.05 weight %,
The Cr of 1.00%-1.25 weight %, the Mo of 0.30%-0.50 weight %, the V of 0.07%-0.09 weight %, and meet 3.1 weights
Measure the weight % of %≤Mn+Cr≤3.3.
2. bainite rail according to claim 1, wherein, on the basis of the weight of the bainite rail, the shellfish
The content of family name's body ferrite slip is 91-95 weight %, and the content of the film-form retained austenite is 2-5 weight %, described
The content of martensite is 2-5 weight %.
3. a kind of preparation method of the bainite rail described in claims 1 or 2, this method include：After isothermal holding
Steel billet carries out rolling waste heat rail, treats that the tread center of waste heat rail is cooled to the central temperature of rail head tread in air
After 350-370 DEG C, gained waste heat rail is placed at 375-405 DEG C and is tempered 4-8h, is then cooled to room temperature in air.
4. according to the method described in claim 3, wherein, gained waste heat rail is placed at 385-392 DEG C and is tempered 5-7h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036574.XA CN106435367B (en) | 2016-11-23 | 2016-11-23 | A kind of bainite rail and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036574.XA CN106435367B (en) | 2016-11-23 | 2016-11-23 | A kind of bainite rail and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106435367A CN106435367A (en) | 2017-02-22 |
| CN106435367B true CN106435367B (en) | 2018-07-10 |
Family
ID=58221752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611036574.XA Active CN106435367B (en) | 2016-11-23 | 2016-11-23 | A kind of bainite rail and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106435367B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT519669B1 (en) * | 2017-06-07 | 2018-09-15 | Voestalpine Schienen Gmbh | Rail part and method for producing a rail part |
| CN111918980A (en) | 2018-03-30 | 2020-11-10 | 杰富意钢铁株式会社 | Guide rail and method for manufacturing the same |
| CN110592354B (en) * | 2019-09-12 | 2021-01-05 | 北京交通大学 | Method for preparing 1380 MPa-level bainite steel rail through waste heat quenching-self-distribution |
| CN110565015A (en) * | 2019-09-20 | 2019-12-13 | 陕西法士特齿轮有限责任公司 | Low-carbon bainite steel synchronizer gear hub and manufacturing method thereof |
| CN113999962A (en) * | 2021-11-09 | 2022-02-01 | 攀钢集团攀枝花钢铁研究院有限公司 | High-toughness bainite steel rail and production method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1232089A (en) * | 1998-04-16 | 1999-10-20 | 铁道部鞍山工务器材厂 | Railway elastic strip of low alloy steel and its heat treatment method |
| JP3287496B2 (en) * | 1993-04-30 | 2002-06-04 | 新日本製鐵株式会社 | Manufacturing method of bainite steel rail with excellent surface damage resistance |
| CN102534387A (en) * | 2011-12-12 | 2012-07-04 | 中国铁道科学研究院金属及化学研究所 | Bainite/martensite steel rail with 1,500 Mpa level of high toughness and manufacturing method thereof |
| CN102839268A (en) * | 2012-08-28 | 2012-12-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Heat treatment method of bainite switch rail |
| CN103966520A (en) * | 2014-05-08 | 2014-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Bainite steel rail containing micro carbide and production method thereof |
| CN104087852A (en) * | 2014-07-25 | 2014-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength bainite steel rail and production method thereof |
| CN106048430A (en) * | 2016-07-06 | 2016-10-26 | 马钢(集团)控股有限公司 | Bainite steel wheel for high-tenacity rail transit and manufacture method thereof |
-
2016
- 2016-11-23 CN CN201611036574.XA patent/CN106435367B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3287496B2 (en) * | 1993-04-30 | 2002-06-04 | 新日本製鐵株式会社 | Manufacturing method of bainite steel rail with excellent surface damage resistance |
| CN1232089A (en) * | 1998-04-16 | 1999-10-20 | 铁道部鞍山工务器材厂 | Railway elastic strip of low alloy steel and its heat treatment method |
| CN102534387A (en) * | 2011-12-12 | 2012-07-04 | 中国铁道科学研究院金属及化学研究所 | Bainite/martensite steel rail with 1,500 Mpa level of high toughness and manufacturing method thereof |
| CN102839268A (en) * | 2012-08-28 | 2012-12-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Heat treatment method of bainite switch rail |
| CN103966520A (en) * | 2014-05-08 | 2014-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Bainite steel rail containing micro carbide and production method thereof |
| CN104087852A (en) * | 2014-07-25 | 2014-10-08 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength bainite steel rail and production method thereof |
| CN106048430A (en) * | 2016-07-06 | 2016-10-26 | 马钢(集团)控股有限公司 | Bainite steel wheel for high-tenacity rail transit and manufacture method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106435367A (en) | 2017-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106435367B (en) | A kind of bainite rail and preparation method thereof | |
| US20190338402A1 (en) | Method for manufacturing railway vehicle wheel | |
| CN101586216B (en) | Ultra-high strength and toughness bainitic steel and manufacturing method thereof | |
| CN105385938B (en) | Alloy system, heat treatment method for Bainite steel rail of alloy system and Bainite steel rail | |
| WO2018006844A1 (en) | High strength, high toughness, heat-cracking resistant bainite steel wheel for rail transportation and manufacturing method thereof | |
| CN106086663B (en) | A kind of hypereutectoid rail and preparation method thereof | |
| CN107746915B (en) | A kind of brake disc of high-speed train steel | |
| CN107267864B (en) | A kind of high-strength spring steel | |
| US20140144557A1 (en) | Method for producing low temperature bainite steel containing aluminum | |
| CN106521315A (en) | High strength and high toughness heavy haul train wheel steel and heat treatment method thereof | |
| CN100366779C (en) | Stone material cutting saw blade steel and its manufacturing method | |
| CN110791715A (en) | Niobium-titanium-containing atmospheric corrosion-resistant 14.9-grade high-strength bolt steel and production method thereof | |
| WO2019218135A1 (en) | Ultra high strength steel having yield strength of 1,000 mpa and low yield-tensile ratio, and preparation method thereof | |
| CN107988564B (en) | A kind of ultra-fine grain ultra-high strength and toughness high speed axle steel and its heat treatment method | |
| CN105039861B (en) | A kind of middle manganese boric low alloy wear resistant steel plate and preparation method thereof | |
| CN108588580A (en) | A kind of high-purity bainitic steel, wheel and manufacturing method comprising it | |
| CN106756509B (en) | A kind of high-temperature alloy structural steel and its Technology for Heating Processing | |
| CN110172646A (en) | A kind of storage tank for ship P690QL1 steel plate and manufacturing method | |
| CN107760838B (en) | A kind of brake disc of high-speed train Heat-Treatment of Steel method | |
| CN103014535B (en) | Axle steel and axletree | |
| JP2011510175A (en) | High alloy cold die steel | |
| CN106521343A (en) | Ultrahigh strength aluminum alloyed superhigh carbon wheel steel and heat treatment method thereof | |
| CN105102659A (en) | Steel sheet for nitriding and production method therefor | |
| CN106555131B (en) | A kind of Super High Carbon profile shaft holds Heat-Treatment of Steel method | |
| CN105695858B (en) | Railroad frog high-carbon ultra high silicon bainitic steel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |