CN104278205A - Low-carbon carbide-free bainitic steel, and manufacturing method and application thereof in steel rails - Google Patents
Low-carbon carbide-free bainitic steel, and manufacturing method and application thereof in steel rails Download PDFInfo
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- CN104278205A CN104278205A CN201410444533.9A CN201410444533A CN104278205A CN 104278205 A CN104278205 A CN 104278205A CN 201410444533 A CN201410444533 A CN 201410444533A CN 104278205 A CN104278205 A CN 104278205A
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- 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
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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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B5/00—Rails; Guard rails; Distance-keeping means for them
- E01B5/02—Rails
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Abstract
The invention discloses a carbide-free low-carbon bainitic steel, and a manufacturing method and application thereof in steel rails. The metallurgical structure of the bainitic steel is a complex-phase structure composed of bainite and martensite, wherein the volume percent of the bainite structure is 20-50%, and the bainitic steel contains no carbide. The low-carbon bainitic steel contains the following chemical elements in percentage by mass: 0.10-0.22% of C, 0.9-1.6% of Si, 1.7-2.4% of Mn, 0.2-1.0% of Cr, 0.01-0.15% of V, less than 0.012% of P, less than 0.015% of S, and the balance of Fe and inevitable impurities. The carbide-free low-carbon bainitic steel has the advantages of low cost and favorable comprehensive properties, and conforms to the policy requirements for energy saving and emission reduction.
Description
Technical field
The invention belongs to alloy field, a kind of low-carbon (LC) and the bainitic steel of carbides-free specifically, applicant names its trade mark to be 20Mn2SiCrV low-carbon (LC) non-carbide bainitic steel, gained steel grade has the features such as high strength, high tenacity, high-wearing feature, excellent combination property, can significantly improve the work-ing life of product.The invention still further relates to it and be suitable for industrialized preparation method, and this kind of application of steel in rail.
Background technology
Steel are the requisite valuable cargos of nation-building, and it is widely used, various in style.Along with the development of economic construction, steel are as the important component part of structure and functional materials, and the requirement of people to its machinery and use properties improves constantly.The R&D and production of special steel becomes the main development direction of steel industry, and wherein bainitic steel is approved by every profession and trade just gradually with its excellent properties.
The development of railway occupies critical role in Economic development, and rail seems particularly important as the basis of railway development.Due to rail carrying locomotive weight rolled and impact, therefore require all higher to the intensity of rail, hardness, unit elongation, weldability and tough, particularly heavy-duty steel rail, its over-all properties requires higher.At present, steel rail steel can be divided into following a few class: perlitic steel, low-carbon martensitic steels and bainitic steel.Research shows, the research of perlitic steel performance and complete processing is close to the limit, and low-carbon martensitic steels welding property is unstable.At present, in world wide, rail steel are mainly perlitic steel, and the subject matter that this perlitic steel exists is that impelling strength is on the low side, and the pearlite steel rail web section impelling strength that China produces is lower than 8J/cm
2.And bainitic steel various aspects of performance is excellent, it is one of direction of rail material development from now on.At present, external bainitic steel research emphasis is upper bainite, and shock resistance and the toughness of material affect obviously by carbon content.For avoiding carbon content to the disadvantageous effect of Fracture of Material, low-carbon bainite steel becomes the focus of research in recent years.
At the bainitic steel research initial stage, for obtaining good lower bainite tissue, must carry out isothermal processes, this has inconvenience in production.The research of Bainitic Phase Transformation has promoted bainitic steel development and application, adopts the bainitic steel of air cooling to be developed.In order to ensure the rational hardening capacity required for the intensity of steel grade and bainite transformation, need to add other alloying elements being applicable to changing, to be transformed into carbide-free Bainite tissue by alloying.Current bainitic steel mainly contains following system:
(1) Mo-B system bainitic steel, suppresses the formation of polygonal ferrite by adding Mo and B in the alloy.But this steel initial transition temperature is high, poor toughness.
(2) Mn-B system bainitic steel, combined by Mn and B, Bainite Phases of Some temperature is reduced, and refinement bainite size, improves intensity and toughness.Shortcoming is that the compound forming B can reduce toughness of material because the chemical property of B is active, wayward.
(3) Si-Mn-Mo quasi-bainite steel, improves hardening capacity by Mn and Mo.
(4) micro-alloyed air cooled bainitic steel, by adding Re, Ti, V alloy, makes austenite grain size reduce, and the obvious refinement of microstructure, improves obdurability.
(5) containing Cu steel, by adding Cu and B combined action, the proeutectoid ferrite further before suppression bainite transformation is formed, and copper can make the carbide high-temp strain induction of niobium separate out acceleration simultaneously.
In bainitic steel, the use of expensive Mo, Ni, limits the commercialized development of product, and the wayward quality product of B, also restriction is caused to applying of product.In addition, different field is also different to the requirement of the performance of steel, the good weldability of the requirement such as had, some requirements comparatively high-wearing feature.But influencing each other due to alloying element, improve a certain performance and often also can have a negative impact to other performances, this also has higher requirement to the development of bainitic steel.
Steel rail steel, all having higher requirements to the hardness, intensity, toughness, weldability etc. of material, is a major domain of bainitic steel applied research.
At present, what rail bainitic steel major part adopted is all Si-Mn-Mo system, except Si, Mn, Mo are necessary alloying element, even also needs to be added with Cr, Nd, V, Ni etc.This alloy is owing to adopting Mo, Ni, and cost is higher, simultaneously because rail steel using amount is huge, on railway, therefore really applies difficulty very large, limits its commercialization.In addition, the Si-Mn-Mo bainite rail material of exploitation at present, through research, its metallographic structure is bainitic ferrite+(M-A) island, and bainitic ferrite is mostly in lath-shaped feature, and proportion is more than 80%.Its rail head tensile property Rm reaches 1250-1270MPa, unit elongation 12-16%, and impact toughness at room temperature Aku is 72-88J/cm
2, hardness HB is 363-375.(" exploitation of tensile strength 1200MPa bainite rail and the application on railway thereof ", Chen Xin etc., " iron and steel ".November the 43rd in 2008 volume o. 11th).
Chinese patent literature CN102534403A, CN102021481A, Co, W is even also had to instead of Mo, Ni with Nb, V, Ti, growing up of austenite recrystallization crystal grain is suppressed by the carbonitride of separating out Nb, V, Ti in steel rail rolling temperature range, simultaneously using carbonitride as Bainite Phases of Some deformed nucleus particle, increase number of nuclei, produce ferrite bainite as much as possible, the size on restriction M-A island and proportion.Its mechanical property is that Rm reaches 1060-1350MPa, and unit elongation 11-16.5%, impact toughness at room temperature Aku are 28-52J/cm
2.
The heart rail of the compound railway frog of applicant's exploitation, main alloy element is Si, Mn, Cr, Mo, Ni, is accompanied by micro-V and Nd, and its tensile strength is greater than 1320MPa, and unit elongation is greater than 9%, and impact toughness at room temperature is greater than 75J/cm
2, hardness HRC38-45.Alloying element is the curve of Si, Mn, Cr, Mo, Ni and heavily loaded bainite rail, and its tensile strength is 1300-1500MPa, unit elongation A>=10%, impact toughness at room temperature>=75J/cm
2, Brinell hardness>=380HB.
Above-mentioned bainite rail, although have outstanding performance in performance, but owing to all have employed the expensive alloying elements such as Mo, Ni, Nb, Ti, therefore all has the high deficiency of cost, limits commercial applications.
Japan exploitation bainitic steel with Mn, Si, Cr for main alloy element (CN102021481A), select to add Mo, Cu, Ni or Ti, V, Nb or B, its control method is cooled fast to 500-300 DEG C to naturally cool to normal temperature again by the high temperature of more than 700 DEG C with the speed of 1-10 DEG C/s.Its metallographic structure mainly bainite structure, and likely have small tempered martensite, the document thinks that martensite damages steel toughness, and therefore martensitic stucture is more few better.Its deficiency is that its impelling strength is lower simultaneously in raising wear resistance, even if it will control the appearance of martensitic stucture, but its impelling strength will be starkly lower than aforementioned domestic bayesian iron rail, therefore it is only suitable for making rail upper end anti-wear component, makes the web of the rail then because poor impact toughness can reduce work-ing life on the contrary.
In addition, for improving railway transportation capability, heavy-duty steel rail not only desired strength and hardness good, also On Impact Toughness is had higher requirement, although existing its impelling strength of bainite rail material improves a lot than traditional low carbon martensite rail, due to the high cost of current bainite rail material, impelling strength is low means that rail life is short, based on above-mentioned various reasons, current bainitic steel expands wide application due to the real commercialization of the factors such as cost on rail and receives larger restriction.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of low-carbon (LC) non-carbide bainitic steel material, it is a kind of 20Mn2SiCrV low-carbon bainite steel, this steel does not need to add expensive alloying elements Mo, Ni, Nd etc., do not need to add active element B yet, therefore the cost of material is low, and over-all properties is better than existing steel rail steel.
Another object of the present invention is also to provide the application of this 20Mn2SiCrV low-carbon bainite steel on rail.
The present invention's the 3rd object is to provide a kind of above-mentioned 20Mn2SiCrV low-carbon bainite steel in the cold production method of line traffic control.
Applicant is surprised to find through large quantifier elimination, as bainite rail, not bainite structure content is more high better, alloying element of the present invention is adopted to form, controlling metallographic structure is lower bainite and martensite complex body, and lower bainite tissue volume mark be 20-50% and carbides-free time, the bainitic steel obtained not only intensity, unit elongation and hardness is excellent, and higher impelling strength can be obtained, therefore steel rail steel is particularly suitable for, and do not need the alloying elements such as Mo, Ni, reduce cost, be easy to promote.
For realizing the present invention's first object, provide a kind of 20Mn2SiCrV carbides-free low-carbon bainite steel, its metallographic structure is the heterogeneous structure that bainite and martensite is formed, carbides-free, and bainite structure volume fraction is wherein 20-50%; The chemical element that this low-carbon bainite steel contains and mass percent thereof are: the V of Cr, 0.01-0.15% of Mn, 0.2-1.0% of Si, 1.7-2.4% of C, 0.9-1.6% of 0.10-0.22%, be less than the P of 0.012%, be less than the S of 0.015%, and surplus is Fe and inevitable impurity.
Comparative optimization be, the chemical element contained and mass percent thereof are: the V of Cr, 0.03-0.12% of Mn, 0.3-0.8% of Si, 1.8-2.3% of C, 1.0-1.4% of 0.14-0.20%, be less than the P of 0.012%, be less than the S of 0.015%, and the Fe of surplus and inevitable impurity.
20Mn2SiCrV of the present invention is main alloy element with C-Mn-Si-Cr, avoids adding Ni, Co, W, Nb element, is conducive to reducing cost of alloy; Containing lower P, S content, be conducive to the anti-brittle failure ability improving rail.Its special lower bainite and martensitic compound metallurgical structure, the crystal boundary grain direction of crystal grain contact surface is interlocked, and when being subject to shock stress, can not extend along fixed-direction in intercrystalline failure direction, therefore improves its impelling strength.
The application of a kind of above-mentioned 20Mn2SiCrV carbides-free low-carbon bainite steel in rail, this 20Mn2SiCrV carbides-free low-carbon bainite steel, its tensile strength is greater than 1250MPa, and yield strength is greater than 900MPa, unit elongation is greater than 10%, and impact toughness at room temperature Aku is greater than 100J/cm
2, Brinell hardness HB size 390, has excellent over-all properties, and the alloying element cost adopted is low, easy being easy to of manufacture method controls, and meets the strategic requirement of China's energy-saving and emission-reduction, the needs of railway construction in China can be met, be specially adapted to heavy haul railway circuit.
Present invention also offers the preparation method of 20Mn2SiCrV low-carbon bainite steel, the method comprises the steps:
(1) smelt: through converter or electrosmelting-stove refining-vacuum outgas-continuous casting-rolling-slow cooling, obtain the continuous casting steel billet containing following weight percent chemical element: the V of Cr, 0.01-0.15% of Mn, 0.2-1.0% of Si, 1.7-2.4% of C, 0.9-1.6% of 0.10-0.22%, be less than the P of 0.012%, be less than the S of 0.015%, and the Fe of surplus and inevitable impurity;
(2) rolling: by above-mentioned continuous casting steel billet through heating-cogging-roughing and finish rolling;
(3) cold in line traffic control, steel billet after finish rolling is carried out cold in line traffic control, forced to be cooled to 200-350 DEG C with the cooling rate of 1-10 DEG C/s by steel billet, then slowly cool to room temperature with the cooling rate of 0.01-0.5 DEG C/s, obtaining containing volume fraction is 20-50% bainite structure;
(4) stabilization treatment: by above-mentioned bainite steel billet being incubated 6-60 hour at 200-350 DEG C of temperature, stablize microstructure, eliminates unrelieved stress.
In the present invention, owing to reducing the alloying elements such as Mo, Nb, B, for obtaining the bainite of desired properties, to the control of non-metallic inclusion in steel billet, particularly more strict to the more conventional bainitic steel of control of [H], P, S content, the present invention specifically can adopt with the following method:
A () adopts High-Alumina/MgO-C refractory materials in described smelting and stove refining process, and lime CaCO
3/ MgCO
3slag charge, only has and meets this condition, could control the non-metallic inclusion level of steel billet, avoids occurring that single macrobead is mingled with;
B () described refining process controls the mass percent of the P of molten steel not higher than 0.01%, [H] and [O] content is less than 2.0ppm and 20ppm respectively;
C in () described smelting, annealing process will adopt and keep 24-120 hour at 600-700 DEG C, only have and meet this condition, effectively could reduce [H] content of steel billet;
The non-metallic inclusion level of final steel billet is: category-A is mingled with and is less than 2.0, and category-B is mingled with and is less than 1.5, C class and is mingled with and is less than 1.5, D class and is mingled with and is less than 1.5.
In the present invention, also comprise the concrete microdefect adopting following methods to eliminate bainite rail and the size reducing original austenite grain:
A milling train tonnage that in (), described step (2), roughing and omnipotent finish rolling adopt, more than 900 tons, only has and meets this condition, effectively could eliminate microdefect;
B in (), described step (2), the termination rolling temperature of omnipotent finish rolling is 950-860 DEG C, only have and meet this condition, could effectively reduce original austenite grain size.The performance of finishing temperature to product has certain association, and the height of speed of cooling speed to tensile strength has very large relation.Cooling is fast, and intensity is large, but impacts (toughness) decline.Last soaking time will have rationally, the time of science.Longly infinitely can not improve performance.Naturally cooling performance is bad, because do not reach rational tissue.
Accompanying drawing explanation
Fig. 1 is 20Mn2SiCrV low-carbon bainite steel metallographic structure photo of the present invention, and in figure, scale is 10 μm.
embodiment
Below in conjunction with specific embodiment, the invention will be further described, to help understanding content of the present invention.、
The preparation of step 1 steel
Steel billet is obtained through converter or electrosmelting-stove refining-vacuum outgas-continuous casting-slow cooling, the chemical element contained and weight percent thereof be Cr, 0.01-0.15% of Mn, 0.2-1.0% of Si, 1.7-2.4% of C, 0.9-1.6% of 0.10-0.22% V, be less than the P of 0.012%, be less than the S of 0.015%, and the Fe of surplus and inevitable impurity;
Smelt and refining process employing High-Alumina/MgO-C refractory materials, and lime CaCO
3/ MgCO
3slag charge;
The mass percent of the P of refining process molten steel is not higher than 0.01%, and [H] and [O] content is less than 2.0ppm and 20ppm respectively;
Annealing process adopts and keeps 24-120 hour at 600-700 DEG C.
The manufacture of step 2 bainite rail
The bainite steel billet that step 1 is obtained is rolled into rail, billet heating temperature is: 1150-1250 DEG C, and cogging temperature is 1100-1200 DEG C, and employing tonnage is the milling train roughing of more than 900 tons, tonnage is the universal rolling finish rolling of 900 tons, and termination rolling temperature is 860-950 DEG C;
The rail type of rail: 50kg/m, 60kg/m, 68kg/m, 75kg/m.
Rail after above-mentioned hot rolling is forced to be cooled to 200-350 DEG C with the cooling rate of 1-10 DEG C/s, then slowly cools to room temperature with the cooling rate of 0.01-0.5 DEG C/s;
By above-mentioned rail at 200-350 DEG C of insulation 6-60 hour, stablize microstructure.
Rail property after thermal treatment is: tensile strength 1200-1500MPa, yield strength 900-1150MPa, and unit elongation is greater than 10%, normal temperature impact value A
kU100-200 J/cm
2, Brinell hardness is greater than HB 390.
The specific embodiment under concrete different condition and mechanical property is given below in table.
Upper embodiment of the present invention 1-7 is the embodiment that alloying element content and heat-treat condition meet application claims, and wherein embodiment 1-5 adopts identical heat-treat condition, and alloying element is different, so that the impact of different-alloy element on product performance to be described.Embodiment 6,7 adopts identical alloying element content with embodiment 4, and adopts different heat-treat conditions.As can be seen from Table 1, in 7 groups of specific embodiments of the present invention, all obtain the bainite of carbides-free, the metallographic structure of martensite compound, wherein bainite structure volume fraction is 20-50%.Fig. 1 shows embodiment 4 and obtains metallographic structure phasor, this tissue carbides-free as seen from the figure, bainite structure is lower bainite, intercrystalline crystal boundary moves towards random, when being therefore subject to impacting, the destruction direction of Stress transmit not easily extends along a direction, may be the raising reason of impelling strength.The tensile strength 1200-1500MPa of product in embodiment 1-7, yield strength is greater than 950MPa, and unit elongation is greater than 10%, impact toughness at room temperature A
kUbe greater than 100J/cm
2, Brinell hardness HB is greater than 390, its high comprehensive performance, can meet current heavy traffic and the requirement of delivery dimension, and product cost is low.And embodiment 2-4 over-all properties is better than embodiment 1,5, it is more preferably embodiment.
And in comparative example 1-4, comparative example 1 constituent content is identical with embodiment 3, but after the cold quick cooling of control, adopt naturally cooling, what obtain is bainite structure substantially, and it is compared with embodiment 3, and impact toughness decreased is obvious.Comparative example 2 does not add V, and what obtain is based on martensitic stucture, all obvious in the present invention in intensity, unit elongation and impelling strength.Comparative example 3 is due to higher S, P content, comparative example 4 does not carry out isothermal holding, although alloying element and the present invention are comparatively close, but due to concrete constituent content difference or the difference due to heat treatment process parameter, cause product metallographic structure to change, the finished product mechanical property is obviously worse than the present invention.
The present invention is not limited to above-mentioned embodiment, and without departing from the spirit and scope of the present invention, the various amendment make the present invention and/or distortion all belong to protection scope of the present invention.
Claims (9)
1. a carbides-free low-carbon bainite steel, its metallographic structure is the heterogeneous structure that bainite and martensite is formed, and bainite structure volume fraction is wherein 20-50%, carbides-free; The chemical element that this low-carbon bainite steel contains and mass percent thereof are: the V of Cr, 0.01-0.15% of Mn, 0.2-1.0% of Si, 1.7-2.4% of C, 0.9-1.6% of 0.10-0.22%, be less than the P of 0.012%, be less than the S of 0.015%, and surplus is Fe and inevitable impurity.
2. carbides-free low-carbon bainite steel as claimed in claim 1, it is characterized in that the chemical element that contains and mass percent thereof are: the V of Cr, 0.03-0.12% of Mn, 0.3-0.8% of Si, 1.8-2.3% of C, 1.0-1.4% of 0.14-0.20%, be less than the P of 0.012%, be less than the S of 0.015%, and the Fe of surplus and inevitable impurity.
3. the application of 20Mn2SiCrV carbides-free low-carbon bainite steel in rail described in claim 1.
4. a production method for carbides-free low-carbon bainite steel described in claim 1, the method comprises the steps:
(1) smelt: through converter or electrosmelting-stove refining-vacuum outgas-continuous casting-rolling-slow cooling, obtain the continuous casting steel billet containing following weight percent chemical element: the V of Cr, 0.01-0.15% of Mn, 0.2-1.0% of Si, 1.7-2.4% of C, 0.9-1.6% of 0.10-0.22%, be less than the P of 0.012%, be less than the S of 0.015%, and the Fe of surplus and inevitable impurity;
(2) rolling: by above-mentioned continuous casting steel billet through heating-cogging-roughing and finish rolling;
(3) cold in line traffic control, steel billet after finish rolling is carried out cold in line traffic control, forced to be cooled to 200-350 DEG C with the cooling rate of 1-10 DEG C/s by steel billet, then slowly cool to room temperature with the cooling rate of 0.01-0.5 DEG C/s, obtaining containing volume fraction is 20-50% bainite structure;
(4) stabilization treatment: by above-mentioned bainite steel billet being incubated 6-60 hour at 200-350 DEG C of temperature, stablize microstructure, eliminates unrelieved stress.
5. production method as claimed in claim 4, is characterized in that: adopt High-Alumina/MgO-C refractory materials in described smelting and stove refining process, and lime CaCO
3/ MgCO
3slag charge.
6. production method as claimed in claim 4, is characterized in that: the mass percent that described refining process controls the P of molten steel is not less than 2.0ppm respectively higher than 0.01%, H and O content and is less than 20ppm.
7. production method as claimed in claim 4, is characterized in that: described annealing process adopts and keeps 24-120 hour at 600-700 DEG C.
8. production method as claimed in claim 4, is characterized in that: the milling train tonnage that in described step (2), roughing and omnipotent finish rolling adopt is more than 900 tons.
9. production method as claimed in claim 4, is characterized in that: in described step (2), the termination rolling temperature of omnipotent finish rolling is 950-860 DEG C.
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| CN104928590A (en) * | 2015-06-11 | 2015-09-23 | 北京交通大学 | Mn-Si-Cr low carbon bainitic steel, and Mn-Si-Cr low carbon drill rod and preparation method thereof |
| CN107058864B (en) * | 2017-01-10 | 2019-07-02 | 北京特冶工贸有限责任公司 | Railroad carriage wheel |
| CN110691856A (en) * | 2017-06-07 | 2020-01-14 | 沃斯特阿尔派因钢轨有限责任公司 | Rail component and method for producing a rail component |
| CN110951943A (en) * | 2019-11-08 | 2020-04-03 | 包头钢铁（集团）有限责任公司 | Baimamu multiphase steel rail and heat treatment method thereof |
| CN111471934A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for self-reinforcing gear and preparation method thereof |
| CN111593270A (en) * | 2019-12-16 | 2020-08-28 | 北京特冶工贸有限责任公司 | 1280 MPa-grade martensite multiphase bainite steel rail for general line and manufacturing method thereof |
| CN115261722A (en) * | 2022-07-29 | 2022-11-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-carbon complex-phase bainite steel rail and preparation method thereof |
| CN116555669A (en) * | 2023-05-16 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Niobium microalloyed high-strength bainite steel rail and production method thereof |
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| CN104928590A (en) * | 2015-06-11 | 2015-09-23 | 北京交通大学 | Mn-Si-Cr low carbon bainitic steel, and Mn-Si-Cr low carbon drill rod and preparation method thereof |
| CN107058864B (en) * | 2017-01-10 | 2019-07-02 | 北京特冶工贸有限责任公司 | Railroad carriage wheel |
| CN110691856A (en) * | 2017-06-07 | 2020-01-14 | 沃斯特阿尔派因钢轨有限责任公司 | Rail component and method for producing a rail component |
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| CN110951943B (en) * | 2019-11-08 | 2021-07-20 | 包头钢铁（集团）有限责任公司 | Baimamu multiphase steel rail and heat treatment method thereof |
| CN111593270A (en) * | 2019-12-16 | 2020-08-28 | 北京特冶工贸有限责任公司 | 1280 MPa-grade martensite multiphase bainite steel rail for general line and manufacturing method thereof |
| CN111471934A (en) * | 2020-05-25 | 2020-07-31 | 武汉钢铁有限公司 | Carbide bainite-free steel for self-reinforcing gear and preparation method thereof |
| CN111471934B (en) * | 2020-05-25 | 2021-08-13 | 武汉钢铁有限公司 | Carbide bainite-free steel for self-reinforcing gear and preparation method thereof |
| CN115261722A (en) * | 2022-07-29 | 2022-11-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-carbon complex-phase bainite steel rail and preparation method thereof |
| CN115261722B (en) * | 2022-07-29 | 2023-04-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-carbon complex-phase bainite steel rail and preparation method thereof |
| CN116555669A (en) * | 2023-05-16 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Niobium microalloyed high-strength bainite steel rail and production method thereof |
| CN116555669B (en) * | 2023-05-16 | 2024-06-11 | 包头钢铁（集团）有限责任公司 | Niobium microalloyed high-strength bainite steel rail and production method thereof |
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