CN106148825A - A kind of bullet train bainite wheel steel and preparation method - Google Patents
A kind of bullet train bainite wheel steel and preparation method Download PDFInfo
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- CN106148825A CN106148825A CN201610822854.7A CN201610822854A CN106148825A CN 106148825 A CN106148825 A CN 106148825A CN 201610822854 A CN201610822854 A CN 201610822854A CN 106148825 A CN106148825 A CN 106148825A
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- 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
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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
- 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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
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- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- 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
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- 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
- C21D2211/002—Bainite
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- Metallurgy (AREA)
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Abstract
The present invention relates to high-speed railway locomotive wheel-use steel material technical field, disclose a kind of bullet train bainite wheel steel, composition is by weight percentage: C:0.36 0.48%, Mn:0.68 1.0%, Si:0.25 0.50%, Cr:0.8 1.5%, Y:0.02 0.08%, P:＜ 0.020%, S:＜ 0.020%, remaining is Fe and inevitable element；Bainite wheel steel is organized as on the bainite ferrite of lamellar and described bainite ferrite the bar-shaped carbide separated out；Also disclose the preparation method of a kind of above-mentioned wheel steel.The invention have the benefit that the wheel steel containing yttrium of unique alloy design and Technology for Heating Processing is on the basis of having high intensity and hardness, significantly improve anti-rolling contact fatigue performance, it is substantially reduced high ferro wheel tread peeling phenomenon, guarantee that high speed train wheel has good usage safety performance, extend wheel service life.
Description
Technical field
The present invention relates to high-speed railway locomotive wheel-use steel material technical field, particularly to a kind of bullet train bainite car
Wheel steel and preparation method.
Background technology
Wheel, in train travelling process, plays carrying, the transmission effect such as power and braking.The abrasion of wheel, fatigue
And mechanical damage, directly affect its service life and traffic safety.Result of study shows, after the speed of service is more than 120km/h, and row
There is notable change in the dynamic conditions of car, the use condition of wheel also occurs significantly to change.Along with carrying of train running speed
Height, the abrasion aggravation between wheel and rail, and during high-speed train braking, produce substantial amounts of frictional heat, exacerbate
The Problem of Failure that wheel and rail cause because of fatigue, stripping etc., brings great hidden danger to the safe operation of bullet train, even
There is security incident, add the railway cost of overhaul simultaneously.High speed passenger dedicated railway overall trip speed is 250-350km/h, needs car
Wheel adapts to load capacity with high intensity, ensures wheel reliability of operation with high tenacity, extends with high wearability
Its service life.
High speed train wheel steel mainly carbon content is the medium high carbon low-alloy steel of 0.52-0.75% now, metallographic group
It is woven to Ferrite-Perlite structure.Carbon content such as Europe high-speed wheel steel R7 is 0.52%, and chromium content is 0.30%, is ferrum
Ferritic-pearlitic steel, mainly with Si, Mn as intensified element.The main damage of this wheel steel is shelled tread, even occurs 1998
The major traffic accidents of year Germany's high-speed wheel fracture；Japan's high ferro includes that the wheel steel of the Shinkansen train is high-carbon carbon steel,
Representing the trade mark is SSW, and carbon content is 0.60-0.75%, is ferrite pearlific steel, uses the measure adding V strengthening.Japan grinds
The person of studying carefully damages performance for improving the wheel cracking resistance when high-speed cruising, takes to reduce carbon content microalloying, improves the toughness of material,
Thus performance is damaged in the heat resistanceheat resistant improving material.In order to optimize intensity and the toughness of steel, countries in the world are all at active development wheel steel
Optimizing components and Technology for Heating Processing research.
Although toughness of material can be improved by reducing carbon content microalloying, but the wheel steel of pearlitic structrure is moulded
Toughness is on the low side, and wheel is under high speed, complicated service condition, and wheel tread is acted on to complicated contact stress by each, is stepping on
Face position is easily generated the defects such as shear crack, stripping, fatigue, jeopardizes the traffic safety of train.And bainitic steel has obdurability
Join more excellent, combination property is higher, characteristic based on bainitic steel, its impact flexibility be far above existing perlite product.
CN103993237A patent describes a kind of anti abrasive bainite turnout rail and production method thereof: this bainite road
Laminar bainite ferrite and the point-like of Dispersed precipitate or bar-shaped carbide, institute is had in the range of switch track top layer to heart portion 30mm
State a length of 0.05-0.5um of carbide, there is good obdurability and wearability.CN1510155 patent discloses a kind of anti-
Abrasion, high-strength tenacity meta-bainite railroad turnout steel rail and production technology thereof, be organized as lath ferrite and retained austenite, its mechanics
Functional, but anti-rolling contact fatigue performance is low, and abrasion resistance properties is the highest.
Summary of the invention
The purpose of the present invention overcomes the deficiencies in the prior art exactly, it is provided that a kind of bullet train with bainite wheel steel and
Heat treatment method, is designed by composition and optimization of Heat Treatment Process, obtains a kind of resisting fatigue, anti abrasive high ferro wheel-use steel material.
One bullet train bainite wheel steel of the present invention, the composition of described bainite wheel steel is by weight percentage
For: C:0.36-0.48%, Mn:0.68-1.0%, Si:0.25-0.50%, Cr:0.8-1.5%, Y:0.02-0.08%, P:＜
0.020%, S:＜ 0.020%, remaining is Fe and inevitable element.
Further, described C content is: 0.38-0.46%, and described Cr content is: 0.9-1.3%.
Further, described Y content is: 0.03-0.06%.
Further, described bainite wheel steel is organized as: the bainite ferrite of lamellar and described bainite ferrite
The bar-shaped carbide of upper precipitation.
The preparation method of a kind of above-mentioned bullet train bainite wheel steel, preparation method is to use vacuum by component requirements
Induction melting, is rolled into wheel according to common process forging and slow cooling processes；Heat treatment step is: wheel steel is warming up to stove
840-860 DEG C, air cooling of coming out of the stove after insulation 1.5-2.5h is to temperature, then with stove, wheel steel is warming up to 840-860 DEG C, is incubated 1.5-
2.5h, spray cooling after coming out of the stove, after making wheel be cooled to 200 DEG C with the cooling rate of 10-20 DEG C/s, air cooling is to room temperature, then that mist is cold
Wheel steel put in 500-520 DEG C of stove, insulation 2-3h after, air cooling of coming out of the stove is to room temperature.
The invention have the benefit that to solve high speed train wheel steel anti-rolling contact fatigue performance low, wear-resistant
The problem that performance is the highest；Unique alloy design and Technology for Heating Processing containing yttrium wheel steel, there is high intensity and hardness basis
On, significantly improve its anti-rolling contact fatigue performance, be substantially reduced high ferro wheel tread peeling phenomenon, it is ensured that high speed train wheel
There is good usage safety performance, extend the wheel service life under high speed service condition.
Accompanying drawing explanation
Fig. 1 show the bullet train bainite wheel steel of the embodiment of the present invention 1 microscopic structure under light microscopic.
Fig. 2 show the bullet train bainite wheel steel of the embodiment of the present invention 1 microscopic structure under scanning electron microscope.
Fig. 3 show the H curve of the bullet train bainite wheel steel of the embodiment of the present invention 2.
Fig. 4 show the grain size image of the bullet train bainite wheel steel of the embodiment of the present invention 3.
Detailed description of the invention
The specific embodiment of the invention is described in detail below in conjunction with concrete accompanying drawing.It should be noted that, in following embodiment
The technical characteristic described or the combination of technical characteristic are not construed as isolating, and they can be mutually combined thus reach
To superior technique effect.In the accompanying drawing of following embodiment, the identical label that each accompanying drawing is occurred represent identical feature or
Person's parts, can be applicable in different embodiment.
Embodiment of the present invention one bullet train bainite wheel steel, the composition by weight hundred of described bainite wheel steel
Proportion by subtraction is: C:0.36-0.48%, Mn:0.68-1.0%, Si:0.25-0.50%, Cr:0.8-1.5%, Y:0.02-0.08%,
P:＜ 0.020%, S:＜ 0.020%, remaining is Fe and inevitable element.
Preferably, described C content is: 0.38-0.46%, and described Cr content is: 0.9-1.3%.
Preferably, described Y content is: 0.03-0.06%.
Preferably, described bainite wheel steel is organized as: on the bainite ferrite of lamellar and described bainite ferrite
The bar-shaped carbide separated out, improves the obdurability of railroad carriage wheel, contact fatigue property and wearability, greatly reduces wheel and step on
Face peeling phenomenon, improves vehicle safety in operation.
The preparation method of a kind of above-mentioned bullet train bainite wheel steel, preparation method is to use vacuum by component requirements
Induction melting, is rolled into wheel according to common process forging and slow cooling processes；Heat treatment step is: wheel steel is warming up to stove
840-860 DEG C, air cooling of coming out of the stove after insulation 1.5-2.5h is to temperature, then with stove, wheel steel is warming up to 840-860 DEG C, is incubated 1.5-
2.5h, spray cooling after coming out of the stove, after making wheel be cooled to 200 DEG C with the cooling rate of 10-20 DEG C/s, air cooling is to room temperature, then that mist is cold
Wheel steel put in 500-520 DEG C of stove, insulation 2-3h after, air cooling of coming out of the stove is to room temperature.
Bullet train bainite wheel steel mentioned by the present invention is smelted according to above-mentioned alloying element and content and is formed, group
It is woven on the bainite ferrite of lamellar and described bainite ferrite the bar-shaped carbide separated out.According to heat resistanceheat resistant damage performance with
The Martensite phase transition of steel starts the relation of temperature, and anti-fatigue performance and the heat resistanceheat resistant damage performance of bainite wheel steel all compare
Good.Rare-earth yttrium effect in steel mainly includes cleaning molten steel, rotten field trash and microalloying, RE-treated energy deoxidation, de-
Sulfur, the form of change field trash, the anti-crack germinating improving wheel steel and the ability extended.The railway vehicle truck that the present invention is carried
The bainitic steel of wheel has the highest obdurability, contact fatigue property and wearability, and the high ferro wheel that bainitic steel is made is big
The big wheel tread peeling phenomenon that reduces, prolongation service life improves vehicle safety in operation.
The each main chemical elements of the heretofore described wheel steel of following description is limited in the reason of above-mentioned scope.
C: carbon is to ensure that the quenching degree of steel, improves the intensity of steel, hardness and the most important element of wearability, the most at a high speed
The tissue of wheel steel to improve the toughness of wheel steel on the basis of meeting requirement of strength as far as possible, improves resistance to crack extension ability
And anti-rolling contact fatigue performance, the too high meeting of carbon content causes that intensity index is too high and plasticity and toughness are relatively low.Therefore, present invention design
The composition range of C is 0.36-0.48%；
Mn: have stronger solid solution strengthening effect, it is possible to decrease the phase transition temperature of steel, improves the quenching degree of steel, and energy crystal grain thinning,
Thus improve the anti-wear performance of wheel steel.Research shows that its content keeps less than 1.0% intensity that can make steel and hardness to improve,
And the toughness of steel does not significantly decreases.For ensureing preferable obdurability proportioning, it is 0.68-that the present invention designs the composition range of Mn
1.0%.
Si: be the significant alloying element of solid solution strengthening effect, its solid solution strengthening effect is higher than Mn, the most also makes wheel steel be subject to
It is not susceptible to austenite phase transformation, martensite transfor mation when heat, cooling, contributes to improving the heat resistanceheat resistant damage performance of steel, but too high Si
Heat sensitivity and the fragility of material can be increased.Therefore, Si content is kept about 0.25-0.50%% by the present invention, can make car
Wheel steel has higher heat resistanceheat resistant damage performance.
Cr: for medium carbide former, the quenching degree of steel can be improved.Meanwhile, carbide in chromium energy homogenization steel
Distribution, reduces carbide size, thus improves the abrasion resistance properties of wheel steel.Chromium can incorporate in ferrite, produces solution strengthening
Effect, improve ferritic intensity, slow down germinating and the propagation of fatigue crack.When chromium content is higher, steel easily occur a large amount of
Martensite.Therefore, the present invention designs the composition range of Cr is 0.8-1.5%.
Y: have certain solid solution capacity in steel, it is possible to suppression phosphorus sulfur and low-melting impurities, at cyrystal boundary segregation, purify and strong
Change crystal boundary, crystal grain thinning, change the Nomenclature Composition and Structure of Complexes of cementite, make carbide spheroidization, refine and be uniformly distributed, and to field trash
Play metamorphism, but the yttrium of excess can increase and is mingled with deterioration performance in steel.Therefore, the present invention designs the composition range of Y and is
0.02-0.08%.
P and S: impurity element, its content should control less than 0.02%.
The bullet train bainite wheel steel obtained by said method has good obdurability and anti-Structure deformation
Fatigue behaviour, thus extend the service life of high-speed railway wheel.
Embodiment 1
The bullet train of the present embodiment bainite wheel steel, its chemical component weight percentage ratio is preferably: the composition of C wheel steel
For: C:0.38%, Mn:0.68%, Si:0.50%, Cr:1.3%, P:＜ 0.020%, S:＜ 0.020%, Y:0.06%, its
Remaining is Fe and inevitable element.Carry out vacuum smelting furnace smelting according to said components and proportioning and cast the round base of φ 160mm,
Make, after cutting ingot, heats forged rolling, heat treatment, the pole that external diameter is 65mm.Pole is carried out heat treatment, concrete heat treatment
Technique is warming up to 860 DEG C with stove, and air cooling of coming out of the stove after insulation 1.5h is to temperature, then with stove, wheel is warming up to 860 DEG C, is incubated 1.5h,
Spray cooling after coming out of the stove, after making wheel be cooled to 200 DEG C with the cooling rate of 10-15 DEG C/s, air cooling is to room temperature, then by car cold for mist
Wheel is put in 520 DEG C of stoves, and after insulation 3h, air cooling of coming out of the stove, to room temperature, obtains the bainite ferrite of lamellar and described bainite ferrum
The bar-shaped carbide separated out in ferritic, as shown in figs. 1 and 2.
After pole is blocked as 20mm length, it is processed into its a diameter of 60mm of rolling contact fatigue experiment slice, thickness 20mm, contact
Width 5mm, carries out rolling to fatigue test piece connect at MJP-20 rolling contact fatigue-testing machine and foundation YB/T 5345-2006
Touch fatigue test.It is U71Mn(TB/T 3276-2011 to mill sample material), its diameter 60mm thickness is 20mm.Rolling contact fatigue
Test actual conditions be hertz stress: 2000MPa, slip: 1.65%, faster rotating wheel be 2000rpm, to mill rail
Sheet rotating speed is 1835rpm, oil lubrication.Test and monitor whether fatigue occurs, and i.e. detects that acceleration is with extensional vibration acceleration
The revolution of 0.5G is as rolling fatigue life.Shut down observation specimen surface abrasion condition for every 500,000 turns.Test result indicate that, 700
After ten thousand turns, wheel contact surface is without substantially damage, and acceleration of vibration is not above 0.5G, and wear extent is less than 0.1mg.Along cross section
Cutting and observe microscopic structure change, secondary textura epidermoidea, without significant change and crackle, does not has significantly along the plasticity in pull strength direction
Rheology, illustrates that this bullet train bainite wheel steel has higher intensity, has higher anti-rolling contact fatigue crackle
Germinating and the performance propagated, have higher anti-rolling contact fatigue performance and abrasion resistance properties.
Embodiment 2
The bullet train of the present embodiment bainite wheel steel, its chemical component weight percentage ratio is preferably: the composition of C wheel steel
For: C:0.46%, Mn:1.0%, Si:0.35%, Cr:0.9%, P:＜ 0.020%, S:＜ 0.020%, Y:0.03%, remaining
For Fe and inevitable element.Carry out vacuum smelting furnace smelting according to said components and proportioning and cast the round base of φ 160mm, warp
Make, after cutting ingot, heats forged rolling, heat treatment, the pole that external diameter is 65mm.Pole is carried out heat treatment, concrete heat treatment work
Skill is warming up to 840 DEG C with stove, and air cooling of coming out of the stove after insulation 2.5h is to temperature, then with stove, wheel is warming up to 840 DEG C, is incubated 2.5h, goes out
Furnace rear spray cooling, after making wheel be cooled to 200 DEG C with the cooling rate of 10-20 DEG C/s, air cooling is to room temperature, then by mist car after cold
Wheel is put in 500 DEG C of stoves, and after insulation 2h, air cooling of coming out of the stove is to room temperature.
. the pole of above-mentioned 65mm diameter is intercepted 100mm, carries out end hardening experiment according to TB/T 225-2006, produce
Standard specimen in the stove of 840 DEG C, be incubated 50min, take out from stove subsequently and be put on quenching frame, sparge pipe internal diameter is
12.5mm, water column free height is 65mm, and water temperature is 20-30 DEG C.Sample grinds a flat stone mill after being cooled to room temperature along its length
Cutting the degree of depth is 0.4mm, measures a hardness number (HRC) at a certain distance from end.Its depth-hardness curve is as shown in Figure 3.Its
Half martensite offset quenched end distance is 24mm, and hardness number increases without declining suddenly with the distance away from quenched end, and this height is described
Speed train bainite wheel steel has preferable quenching degree so that it is be easy to get in heat treatment operation equally distributed bainite
Tissue.The present embodiment high speed train is with the H curve of bainite wheel steel as shown in Figure 3.
Embodiment 3
The bullet train of the present embodiment bainite wheel steel, its chemical component weight percentage ratio is preferably: the composition of C wheel steel
For: C:0.40%, Mn:0.68%, Si:0.23%, Cr:0.1.1%, P:＜ 0.020%, S:＜ 0.020%, Y:0.05%,
Remaining is Fe and inevitable element.Carry out vacuum smelting furnace smelting according to said components and proportioning and cast the circle of φ 160mm
Base, makes, after cutting ingot, heats forged rolling, heat treatment, the pole that external diameter is 65mm.Pole is carried out heat treatment, at concrete heat
Science and engineering skill is warming up to 840 DEG C with stove, and air cooling of coming out of the stove after insulation 2h is to temperature, then with stove, wheel is warming up to 840 DEG C, is incubated 2h, goes out
Furnace rear spray cooling, after making wheel be cooled to 200 DEG C with the cooling rate of 10-20 DEG C/s, air cooling is to room temperature, then by mist car after cold
Wheel is put in 500 DEG C of stoves, and after insulation 2h, air cooling of coming out of the stove is to room temperature.
The sample that the pole of above-mentioned 65mm diameter intercepts 10x10x20mm does the experiment of surface oxidation method, determines the crystal grain of steel
Degree size.Said sample longitudinal surface is put into after grinding, polishing insulation 20min in 840 DEG C of stoves, the most considerable through slight polishing
Observe grain size as shown in Figure 4, grain size 7 grades, it is better than TB/T2817-1997 rail truck and rolles over steel solid wheel technology bar
Part, and 250 kilometers of speed per hour EMUs are with rolling over the requirement to grain size 6 grades of the steel solid wheel trial-manufacture technology condition draft.This reality
Execute the grain size image of example high speed train bainite wheel steel as shown in Figure 4.
The invention have the benefit that to solve high speed train wheel steel anti-rolling contact fatigue performance low, wear-resistant
The problem that performance is the highest；Unique alloy design and Technology for Heating Processing containing yttrium wheel steel, there is high intensity and hardness basis
On, significantly improve its anti-rolling contact fatigue performance, be substantially reduced high ferro wheel tread peeling phenomenon, it is ensured that high speed train wheel
There is good usage safety performance, extend the wheel service life under high speed service condition.
Although having been presented for several embodiments of the present invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment is exemplary, no
Should be using the embodiments herein as the restriction of interest field of the present invention.
Claims (5)
1. a bullet train bainite wheel steel, it is characterised in that the composition percentage by weight of described bainite wheel steel
Ratio is: C:0.36-0.48%, Mn:0.68-1.0%, Si:0.25-0.50%, Cr:0.8-1.5%, Y:0.02-0.08%, P:
＜ 0.020%, S:＜ 0.020%, remaining is Fe and inevitable element.
2. bullet train bainite wheel steel as claimed in claim 1, it is characterised in that described C content is: 0.38-
0.46%, described Cr content is: 0.9-1.3%.
3. bullet train bainite wheel steel as claimed in claim 1, it is characterised in that described Y content is: 0.03-
0.06%.
4. bullet train bainite wheel steel as claimed in claim 1, it is characterised in that described bainite wheel steel tissue
For: the bar-shaped carbide separated out on the bainite ferrite of lamellar and described bainite ferrite.
5. the bullet train preparation method of bainite wheel steel as described in any one of claim 1-5, it is characterised in that
Preparation method is to use vacuum induction melting by component requirements, is rolled into wheel according to common process forging and slow cooling processes；Heat
Treatment process is: wheel steel is warming up to 840-860 DEG C with stove, insulation 1.5-2.5h after come out of the stove air cooling to temperature, then by wheel steel with
Stove is warming up to 840-860 DEG C, is incubated 1.5-2.5h, spray cooling after coming out of the stove, makes wheel be cooled to the cooling rate of 10-20 DEG C/s
After 200 DEG C, air cooling is to room temperature, then puts in 500-520 DEG C of stove by wheel steel cold for mist, and after insulation 2-3h, air cooling of coming out of the stove is to room
Temperature.
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| CN201610822854.7A CN106148825B (en) | 2016-09-13 | 2016-09-13 | A kind of bullet train bainite wheel steel and preparation method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256323A (en) * | 1998-12-07 | 2000-06-14 | 清华大学 | High-strength and high-toughness weldable air-cooled Hongkang bainite steel specially for railway frog |
| CN103627960A (en) * | 2013-12-10 | 2014-03-12 | 南昌航空大学 | Wear-resistant cast steel |
| CN105908095A (en) * | 2016-06-02 | 2016-08-31 | 湖北汽车工业学院 | High-plasticity cast steel and preparation method thereof |
-
2016
- 2016-09-13 CN CN201610822854.7A patent/CN106148825B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256323A (en) * | 1998-12-07 | 2000-06-14 | 清华大学 | High-strength and high-toughness weldable air-cooled Hongkang bainite steel specially for railway frog |
| CN103627960A (en) * | 2013-12-10 | 2014-03-12 | 南昌航空大学 | Wear-resistant cast steel |
| CN105908095A (en) * | 2016-06-02 | 2016-08-31 | 湖北汽车工业学院 | High-plasticity cast steel and preparation method thereof |
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| CN106148825B (en) | 2018-06-12 |
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