CN113637912A - Corrosion-resistant hypereutectoid steel rail and preparation method thereof - Google Patents
Corrosion-resistant hypereutectoid steel rail and preparation method thereof Download PDFInfo
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/085—Rail sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Abstract
The invention discloses a preparation method of a corrosion-resistant hypereutectoid steel rail, which comprises the following steps: preparing a steel rail casting blank; rolling the steel rail casting blank into a steel rail; and carrying out sectional cooling on the rolled steel rail, firstly, standing the rolled steel rail in air for cooling, spraying a cooling medium on the rail head of the steel rail when the central temperature of the top surface of the steel rail is reduced to 730-850 ℃, accelerating and cooling the rail head of the steel rail to 650-750 ℃ at a first cooling rate, then accelerating and cooling the rail head of the steel rail to 400-500 ℃ at a second cooling rate, and then stopping the accelerated cooling, so that the steel rail is continuously cooled to room temperature in the air. The invention also discloses the corrosion-resistant hypereutectoid steel rail prepared by the method. According to the invention, Mo element for inhibiting intergranular corrosion and Nb element for refining the steel rail structure are added into the existing components of the hypereutectoid steel rail, and the corrosion resistance, especially the chloride pitting corrosion resistance, of the hypereutectoid steel rail is improved through component optimization and structure regulation by combining the steel rail production process.
Description
Technical Field
The invention belongs to the technical field of steel rail manufacturing, and particularly relates to a corrosion-resistant hypereutectoid steel rail and a preparation method thereof.
Background
The corrosion of steel rails is always one of the key problems restricting the development of railway transportation. The design service life of the steel rail is usually 10 years, but according to the actual monitoring result of the Ministry of railways, the average service life of the steel rail in China is about 5 years. One of the main causes of rail failure is rail corrosion, particularly rail foot corrosion, and the frequent stress effects between the wheel rails cause fatigue cracks in the rail from the corrosion pits and cause rail failure. In addition, northern winter climate is cold, and the goods such as coal, ore and the like are usually prevented from being frozen into a whole by using an antifreezing solution with chloride as a main component in the transportation process. However, the antifreeze is easy to be scattered on the laid steel rail during transportation, and Cl in the antifreeze is contained-The corrosion of the steel rail is accelerated, particularly the pitting corrosion of the rail bottom, so the problem of the corrosion of the steel rail is particularly prominent in the transportation process in winter in the north.
There are three main methods for improving the corrosion resistance of steel rails: adding alloy elements to optimize the components of the steel rail, protecting the surface coating of the steel rail and sticking zinc sheets and other sacrificial anodes. Wherein, carbon has adverse effect on the corrosion resistance of the steel rail, the higher the carbon content is, the greater the tendency of intercrystalline corrosion is generated, and simultaneously the incubation period of hydrogen corrosion is shortened, so that the corrosion process of the steel is controlled by the carbon content to a certain extent. However, with the rapid development of railway transportation in recent years, in order to meet the transportation requirements of heavy haul railways for large axle load and increasingly high efficiency, the strength and hardness of steel rails are gradually improved, and hypereutectoid steel rails with high carbon content, such as new iron HE370, HE400, Pan steel U95Cr and the like, have been developed to date.
The corrosion-resistant steel rail disclosed in the prior art and the method for manufacturing the same will be briefly described below.
Chinese patent CN107747021A discloses a corrosion-resistant steel rail for high-speed railway and a production method thereof. The steel rail comprises the following components: c: 0.1-0.9%, Si: 0.1-0.8%, Mn: 0.15 to 1.2 percent; cr: less than or equal to 0.4 percent; v is less than or equal to 0.020 percent, and Nb is less than or equal to 0.40 percent; less than or equal to 0.025 percent of S, less than or equal to 0.025 percent of P, and the balance of Fe and impurities. The process of the invention adopts a plasma cladding ferrochrome composite anticorrosive coating on the outer surface of the continuous casting steel rail, and improves the corrosion resistance of the steel rail by a coating technology. However, the invention requires that cladding is completed at 800-1200 ℃ of the continuous casting billet, the operation technology is difficult, and the integrity of the coating and the bonding capability with the steel rail matrix cannot be ensured in the later rolling process.
Chinese patent CN107747040A discloses a method for preparing corrosion-resistant high-speed railway steel rails. The method comprises the steps of refining low-S molten iron fed into a furnace under the protection of high-alkalinity refining slag to obtain molten steel, then completing continuous casting under the protection of the whole process, slowly cooling and cleaning the surface of a billet after continuous casting, then reheating the billet and removing scale on the whole section, spraying alloy substances mainly containing chromium, nickel, aluminum and carbon elements on the surface of the billet, and then rolling the billet. The invention mainly adopts high-temperature spraying, and utilizes the alloy anticorrosive coating to carry out rust prevention protection on the steel rail base, but the stability of the coating is difficult to ensure due to the spraying of various elements in the process design.
Chinese patent CN109112468B discloses an oxide film, a corrosion-resistant steel rail and a preparation method of the steel rail. The method comprises the steps of heating a steel billet in an oxidizing atmosphere until oxide scales on the surface of a steel rail are easy to fall off, descaling by high-pressure water, placing the steel billet in a cogging mill for rolling for 5-7 times, rolling by adopting high reduction in the first and third times, then entering a universal mill, and cooling after rough rolling, medium rolling and finish rolling. The invention provides a method for improving the thickness of an oxide film on the surface of a steel rail and Fe3O4Method for improving corrosion resistance of steel rail, but the method requires air gas as fuelThe steel rail is heated at high temperature for a long time in the oxidizing atmosphere, so that the loss of the steel rail is large and certain potential safety hazards exist.
Chinese patent CN109023126A discloses a method for producing corrosion-resistant steel rails for high-speed railways. The method comprises the steps of utilizing the rolling waste heat of the steel rail, applying 1-3 ℃/s accelerated cooling operation to the steel rail, then utilizing the heat treatment waste heat of the steel rail, spraying hot-melt aluminum liquid on the surface of the steel rail, and improving the corrosion resistance of the steel rail through the protection of a coating of the aluminum liquid. However, aluminum has low hardness and poor bonding force with steel, and involves wheel-rail interaction in the service process of the steel rail, so that long-term protection is difficult to realize.
Chinese patent CN111607738A discloses a corrosion-resistant high-strength pearlitic steel rail and a preparation method thereof. The steel rail components need to meet the following requirements: c: 0.65-0.80%, Si: 0.45-0.85%, Mn: 1.0-1.5%; s is less than or equal to 0.020%, P is less than or equal to 0.020%, Cr: 0.68-0.95%; nb: 0.03-0.06%; cu: 0.8-1.6%, B: 0.002-0.006%, and the balance of Fe and impurities. The steel rail is prepared by the processes of molten iron pretreatment, converter smelting, refining, vacuum treatment, continuous casting, rolling, online heat treatment and the like. The method improves the corrosion resistance of the steel rail by thinning the distance between the steel rail lamella to 90-120 nm. However, in this method, in order to reduce the influence of carbon on the corrosion resistance, the carbon content is controlled to 0.65 to 0.80%, and therefore the strength and hardness of the steel rail are difficult to be compared with those of the hypereutectoid steel rail.
Chinese patent CN110527910A discloses a method for preparing corrosion-resistant nano pearlite steel rail containing rare earth Ce and Nb elements. Refining the steel rail, adding rare earth elements, performing vacuum degassing to obtain a casting blank, heating the casting blank to 1250-1280 ℃, and soaking for more than 80 min; the rough rolling cogging temperature is 1180-1200 ℃, the final rolling temperature is 880-950 ℃, the rolled steel rail is cooled to 750 ℃ at the cooling rate of 3-5 ℃/s, and the steel rail is cooled to 500 ℃ at the cooling rate of 1-3 ℃/s and then is cooled in air. The invention improves the corrosion resistance of the steel rail by controlling and thinning the steel rail structure, but the invention has small rolling control temperature range, high process requirement, larger cooling speed of start cooling and difficult realization of production.
Based on the knowledge, there is still a certain room for improvement on how to improve the corrosion resistance of the steel rail, especially the hypereutectoid steel rail.
Disclosure of Invention
The invention provides a hypereutectoid steel rail with better corrosion resistance and a production method thereof, aiming at the problem that the hypereutectoid steel rail with high carbon content has poorer corrosion resistance. According to the method, Mo element for inhibiting intergranular corrosion and Nb element for refining the steel rail structure are added, and the corrosion resistance, especially the chloride pitting corrosion resistance, of the hypereutectoid steel rail is improved through composition and structure regulation and control by combining a steel rail production process.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided a method for manufacturing a corrosion-resistant hypereutectoid steel rail, the method comprising the steps of:
the method comprises the following steps: preparing a steel rail casting blank;
step two: rolling the prepared steel rail casting blank into a steel rail;
step three: and carrying out sectional cooling on the rolled steel rail, firstly, standing the rolled steel rail in air for cooling, spraying a cooling medium on the rail head of the steel rail when the central temperature of the top surface of the steel rail is reduced to 730-850 ℃, accelerating and cooling the rail head of the steel rail to 650-750 ℃ at a first cooling rate, then accelerating and cooling the rail head of the steel rail to 400-500 ℃ at a second cooling rate, and then stopping the accelerated cooling, so that the steel rail is continuously cooled to room temperature in the air.
According to one embodiment of the invention, the steel rail casting blank prepared in the first step comprises the following components in percentage by mass: c: 0.85 to 1.05%, Si: 0.2-0.8%, Mn: 0.4-1.0%; cr: 0 to 0.4 percent; v is less than or equal to 0.1 percent, S is less than or equal to 0.008 percent, P is less than or equal to 0.025 percent, Mo: 0.05-0.35%, Nb: 0.015 to 0.035%, and the balance of Fe and inevitable impurities.
According to one embodiment of the invention, the sum of the Mo and the Nb in the steel rail casting blank prepared in the step one needs to satisfy the following requirements: mo and Nb are more than or equal to 0.08% and less than or equal to 0.37%.
According to one embodiment of the invention, the steel rail casting blank prepared in the first step contains 0.1-0.3% by mass of Mo and 0.01-0.03% by mass of Nb.
According to an embodiment of the invention, the preparation of the steel rail casting blank in the first step comprises the following steps: the steel rail casting blank is prepared through a molten iron pretreatment process, a converter smelting process, an LF furnace refining process, an RH vacuum treatment process and a continuous casting process.
According to an embodiment of the invention, the preparation of the steel rail casting blank in the first step comprises the following steps: and (2) feeding low-S molten iron into a furnace, performing deoxidation alloying treatment in the tapping process after the converter blowing is finished, and performing soft argon blowing on the alloyed molten steel to homogenize alloy components, wherein the argon blowing time is 5-10 min.
According to an embodiment of the invention, in the second step, a universal rolling mill is adopted to roll the steel rail casting blank into the steel rail.
According to an embodiment of the present invention, the first cooling rate in step three is 3.0 to 4.0 ℃/s, and the second cooling rate in step three is 1.0 to 2.0 ℃/s.
According to an embodiment of the present invention, the cooling medium in step three is compressed air or a water mist mixture.
According to another aspect of the invention, the corrosion-resistant hypereutectoid steel rail prepared by the preparation method comprises the following components in percentage by mass: c: 0.85 to 1.05%, Si: 0.2-0.8%, Mn: 0.4-1.0%; cr: 0 to 0.4 percent; v is less than or equal to 0.1 percent, S is less than or equal to 0.008 percent, P is less than or equal to 0.025 percent, Mo: 0.05-0.35%, Nb: 0.015 to 0.035%, and the balance of Fe and inevitable impurities.
Compared with the prior art, the technical scheme of the invention improves the corrosion resistance of the hypereutectoid steel rail by adding a proper amount of Mo and Nb elements in the hypereutectoid steel rail, and realizes the improvement of the corrosion resistance of the hypereutectoid steel rail by combining with the sectional accelerated cooling of the heat treatment process. The hypereutectoid steel rail produced by the method has better environmental corrosion resistance, especially resistance to pitting corrosion of chloride in an antifreeze, and is suitable for transportation of northern heavy haul railways.
In addition, the beneficial effects of the invention also include:
1. a proper amount of molybdenum and niobium are added into the existing components of the hypereutectoid steel rail, so that additional equipment is not required to be added on the basis of the existing production process, and the controllable production cost of the steel rail is ensured.
2. The steel rail heat treatment process only needs to adjust the steel rail cooling speed, other process parameters are unchanged, and the process flow cannot be obviously changed.
3. Molybdenum and niobium alloy elements are added into the hypereutectoid steel rail, the steel rail structure is refined through a heat treatment process, and the intergranular corrosion resistance and Cl resistance of the steel rail are improved by utilizing the molybdenum elements-The steel rail has better environmental corrosion resistance, particularly the resistance to chloride in antifreeze, and is suitable for transportation of northern heavy haul railways.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As required, detailed embodiments of the present invention are disclosed in the present specification; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms. In the following description, various operating parameters and components are described in various embodiments as contemplated. These specific parameters and components are used in this specification as examples only and are not meant to be limiting.
The invention provides a preparation method of a corrosion-resistant hypereutectoid steel rail, which comprises the following steps:
(1) and (3) feeding low-S molten iron into the furnace, performing deoxidation alloying treatment in the tapping process after the blowing of the converter is finished, and performing soft argon blowing on the alloyed molten steel to homogenize alloy components, wherein the argon blowing time is not less than 5-10 min.
(2) And (2) feeding the molten steel obtained in the step (1) into an LF furnace for electrical heating refining and accurate regulation and control of main alloy components, performing RH vacuum circulation degassing treatment after LF is finished, wherein the vacuum treatment time is 10-20 min, and forming the molten steel into a steel rail casting blank through a continuous casting process. The chemical components of the obtained steel rail casting blank need to meet the following requirements: c: 0.85 to 1.05%, Si: 0.2-0.8%, Mn: 0.4-1.0%; cr: 0 to 0.4 percent; v is less than or equal to 0.1 percent, S is less than or equal to 0.008 percent, P is less than or equal to 0.025 percent, Mo: 0.05-0.35%, Nb: 0.015-0.035%, more than or equal to 0.08% and less than or equal to 0.37% of Mo and Nb, and the balance of Fe and inevitable impurities.
(3) And (3) rolling the steel rail casting blank obtained in the step (2) by adopting a universal rolling mill. The initial rolling temperature is 1100-1200 ℃, and the final rolling temperature is 850-950 ℃.
(4) And (3) cooling the rolled steel rail obtained in the step (3) in air, entering an online heat treatment unit when the central temperature of the top surface of the steel rail is reduced to the start cooling temperature of 730-850 ℃, spraying cooling media to the rail head and two sides of the steel rail, cooling the rail head to the intermediate temperature of 650-750 ℃ at a first cooling rate of 3.0-4.0 ℃/s, cooling to the final cooling temperature of 400-500 ℃ at a second cooling rate of 1.0-2.0 ℃/s, stopping accelerated cooling, and continuously cooling to the room temperature in the air. The cooling medium is compressed air or water mist mixed gas.
The second aspect of the invention provides a corrosion-resistant hypereutectoid steel rail prepared by the preparation method, which comprises the following components in percentage by mass: c: 0.85 to 1.05%, Si: 0.2-0.8%, Mn: 0.4-1.0%; cr: 0 to 0.4 percent; v is less than or equal to 0.1 percent, S is less than or equal to 0.008 percent, P is less than or equal to 0.025 percent, Mo: 0.05-0.35%, Nb: 0.015 to 0.035%, and the balance of Fe and inevitable impurities.
In the invention, in order to compensate the weakening of the corrosion resistance of the steel rail caused by high carbon content, a proper amount of molybdenum and Nb elements are added into the steel rail for component optimization. Molybdenum can reduce the activity of carbon, is beneficial to reducing intercrystalline corrosion tendency, improves the corrosion resistance of steel and reduces the corrosion rate of steel in a corrosive atmosphere environment. Generally, corrosion resistance of steel is enhanced as the structure in steel is refined. Niobium, as a common grain refining element in steel, is also used to improve the corrosion resistance of steel. In addition, the Nb element can reduce the pitting probability of the steel and promote the uniform corrosion process of the steel.
The steel rail produced by the method has better environmental corrosion resistance, particularly resistance to pitting corrosion of chloride in an antifreezing solution, and is suitable for transportation of northern heavy haul railways.
The present invention will be specifically described below with reference to specific examples.
The invention selects seven groups of steel rail samples with different chemical compositions and production processes for comparison. Wherein, the components and the heat treatment process of the examples 1-5 adopt the method of the invention, and the components and the heat treatment process of the comparative examples 1-2 are designed according to the requirements of the conventional steel rail. Specifically, the comparative examples 1-2 adopt low-S molten iron to be fed into a furnace, and carbon and alloy are added after converter blowing deoxidation for refining under the protection of high-alkalinity refining slag; the obtained molten steel is subjected to a continuous casting process to obtain a casting blank; rolling the obtained casting blank by adopting a universal rolling mill; and carrying out online heat treatment on the obtained steel rail, standing the obtained steel rail for cooling in the air, entering an online heat treatment unit when the central temperature of the top surface of the steel rail is reduced to the start cooling temperature, cooling the head of the steel rail to the intermediate temperature at a first cooling rate, cooling to the final cooling temperature at a second cooling rate, stopping accelerated cooling, and continuously cooling to the room temperature in the air.
The compositions of the rail slabs in examples 1 to 5 and comparative examples 1 to 2 are shown in Table 1.
TABLE 1 Steel Rail casting blank composition Table (in% by mass)
The steel rail casting blank containing the components is rolled into a 75kg/m steel rail, and the heat treatment process parameters after rolling are shown in table 2.
TABLE 2 Steel rail heat treatment process parameter table
In order to accurately evaluate the corrosion resistance of the steel rails of examples 1 to 5 and comparative examples 1 to 2, two methods were used to test the corrosion resistance of the steel rails in the present application.
Test example 1
The corrosion resistance of the steel rails prepared in the examples 1-5 and the comparative examples 1-2 is tested according to the standard requirements of TB/T2375-1993 periodic infiltration corrosion test method for weathering steel for railways, samples with the size of 50 multiplied by 1.5mm are cut at the rail bottom of the steel rail to carry out periodic infiltration test, the test time is 72h, and the corrosion rate of the samples is calculated by measuring the weight loss of the samples before and after corrosion. The results are shown in Table 3.
TABLE 3 evaluation of Corrosion resistance
| Numbering | Corrosion rate/g/m2h |
| 1# | 7.8256 |
| 2# | 6.9245 |
| 3# | 7.6354 |
| 4# | 6.4458 |
| 5# | 7.5841 |
| D1# | 10.2645 |
| D2# | 9.7836 |
Test example 2
The marine environment corrosion resistance of the steel rails prepared in the examples 1-5 and the comparative examples 1-2 is tested according to the standard requirements of TB/T2375 + 1993 periodic infiltration corrosion test method for weathering steel for railways, samples with the size of 50 multiplied by 1.5mm are cut at the rail bottom of the steel rail, a periodic infiltration test is carried out in 3.5 wt.% NaCl solution, the test time is 100h, and the pitting corrosion resistance of the steel rail is characterized by measuring the ratio (a/c) of the depth and the width of the pits on the surface of the samples. The results are shown in Table 4.
TABLE 4 evaluation chart of marine environment corrosion resistance
| Numbering | a/c |
| 1# | 0.33 |
| 2# | 0.25 |
| 3# | 0.31 |
| 4# | 0.22 |
| 5# | 0.29 |
| D1# | 0.71 |
| D2# | 0.63 |
As can be seen from the results in tables 3 and 4, the hypereutectoid steel rails prepared by the method of the present invention have smaller corrosion rate and the ratio of depth to width of pits on the surface of the test piece during the periodic wetting test, that is, SO resistance, than the steel rails designed according to the requirements of the conventional steel rails3 2-Corrosion rate and Cl resistance-The pitting corrosion capability is better, and the corrosion resistance is excellent.
It should be understood that although the steps of such methods, etc., are described as occurring in a certain order, such methods may perform operations using the described steps which are performed in an order other than the order described herein. It is further understood that certain steps may be performed simultaneously, that other steps may be added, or that certain steps described herein may be omitted. In other words, the description of the methods herein is provided for the purpose of illustrating certain embodiments and should not be construed as limiting the claimed invention in any way.
The above-described embodiments, particularly any "preferred" embodiments, are possible examples of implementations, and are presented merely for a clear understanding of the principles of the invention. Many variations and modifications may be made to the above-described embodiments without departing substantially from the spirit and principles of the technology described herein. All such modifications are intended to be included within the scope of this disclosure.
Claims (10)
1. The preparation method of the corrosion-resistant hypereutectoid steel rail is characterized by comprising the following steps of:
the method comprises the following steps: preparing a steel rail casting blank;
step two: rolling the prepared steel rail casting blank into a steel rail;
step three: and carrying out sectional cooling on the rolled steel rail, firstly, standing the rolled steel rail in air for cooling, spraying a cooling medium on the rail head of the steel rail when the central temperature of the top surface of the steel rail is reduced to 730-850 ℃, accelerating and cooling the rail head of the steel rail to 650-750 ℃ at a first cooling rate, then accelerating and cooling the rail head of the steel rail to 400-500 ℃ at a second cooling rate, and then stopping the accelerated cooling, so that the steel rail is continuously cooled to room temperature in the air.
2. The method for preparing the corrosion-resistant hypereutectoid steel rail according to claim 1, wherein the steel rail casting blank prepared in the first step comprises the following components in percentage by mass: c: 0.85 to 1.05%, Si: 0.2-0.8%, Mn: 0.4-1.0%; cr: 0 to 0.4 percent; v is less than or equal to 0.1 percent, S is less than or equal to 0.008 percent, P is less than or equal to 0.025 percent, Mo: 0.05-0.35%, Nb: 0.015 to 0.035%, and the balance of Fe and inevitable impurities.
3. The method for preparing the corrosion-resistant hypereutectoid steel rail according to claim 2, wherein the sum of the contents of Mo and Nb in the steel rail casting blank prepared in the first step is required to satisfy the following requirements: mo and Nb are more than or equal to 0.08% and less than or equal to 0.37%.
4. The method for preparing the corrosion-resistant hypereutectoid steel rail according to claim 2, wherein the mass percent of Mo in the steel rail casting blank prepared in the first step is 0.1-0.3%, and the mass percent of Nb is 0.01-0.03%.
5. The method for preparing the corrosion-resistant hypereutectoid steel rail according to claim 1, wherein the preparing of the steel rail casting blank in the first step comprises: the steel rail casting blank is prepared through a molten iron pretreatment process, a converter smelting process, an LF furnace refining process, an RH vacuum treatment process and a continuous casting process.
6. The method for preparing the corrosion-resistant hypereutectoid steel rail according to claim 1, wherein the preparing of the steel rail casting blank in the first step comprises: and (2) feeding low-S molten iron into a furnace, performing deoxidation alloying treatment in the tapping process after the converter blowing is finished, and performing soft argon blowing on the alloyed molten steel to homogenize alloy components, wherein the argon blowing time is 5-10 min.
7. The method for preparing the corrosion-resistant hypereutectoid steel rail according to claim 1, wherein in the second step, a universal rolling mill is adopted to roll the steel rail casting blank into the steel rail.
8. The method for preparing a corrosion-resistant hypereutectoid steel rail according to claim 1, wherein the first cooling rate in step three is 3.0 to 4.0 ℃/s, and the second cooling rate in step three is 1.0 to 2.0 ℃/s.
9. The method for preparing the corrosion-resistant hypereutectoid steel rail according to claim 1, wherein the cooling medium in the third step is compressed air or a water mist mixture.
10. The corrosion-resistant hypereutectoid steel rail is characterized by comprising the following components in percentage by mass: c: 0.85 to 1.05%, Si: 0.2-0.8%, Mn: 0.4-1.0%; cr: 0 to 0.4 percent; v is less than or equal to 0.1 percent, S is less than or equal to 0.008 percent, P is less than or equal to 0.025 percent, Mo: 0.05-0.35%, Nb: 0.015 to 0.035%, and the balance of Fe and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110947175.3A CN113637912A (en) | 2021-08-18 | 2021-08-18 | Corrosion-resistant hypereutectoid steel rail and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110947175.3A CN113637912A (en) | 2021-08-18 | 2021-08-18 | Corrosion-resistant hypereutectoid steel rail and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261733A (en) * | 2022-08-18 | 2022-11-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Wear-resistant corrosion-resistant steel rail for subway and production method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09316598A (en) * | 1996-03-27 | 1997-12-09 | Nippon Steel Corp | Pearlitic rail, excellent in wear resistance and weldability, and its production |
| JP2004043963A (en) * | 2002-05-20 | 2004-02-12 | Nippon Steel Corp | Pearlitic rail having excellent toughness and ductility and production method therefor |
| CN102220545A (en) * | 2010-04-16 | 2011-10-19 | 攀钢集团有限公司 | High-carbon and high-strength heat-treated steel rail with high wear resistance and plasticity and manufacturing method thereof |
| CN107675081A (en) * | 2017-10-10 | 2018-02-09 | 攀钢集团研究院有限公司 | Wear-resistant hypereutectoid rail and its manufacture method |
| CN107739805A (en) * | 2017-10-10 | 2018-02-27 | 攀钢集团研究院有限公司 | High tough hypereutectoid steel rail and its manufacture method |
| CN108385022A (en) * | 2018-03-30 | 2018-08-10 | 鞍钢股份有限公司 | The corrosion-resistant bainite rail of heavy haul railway high toughness wear resistant and its manufacturing method |
-
2021
- 2021-08-18 CN CN202110947175.3A patent/CN113637912A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09316598A (en) * | 1996-03-27 | 1997-12-09 | Nippon Steel Corp | Pearlitic rail, excellent in wear resistance and weldability, and its production |
| JP2004043963A (en) * | 2002-05-20 | 2004-02-12 | Nippon Steel Corp | Pearlitic rail having excellent toughness and ductility and production method therefor |
| CN102220545A (en) * | 2010-04-16 | 2011-10-19 | 攀钢集团有限公司 | High-carbon and high-strength heat-treated steel rail with high wear resistance and plasticity and manufacturing method thereof |
| CN107675081A (en) * | 2017-10-10 | 2018-02-09 | 攀钢集团研究院有限公司 | Wear-resistant hypereutectoid rail and its manufacture method |
| CN107739805A (en) * | 2017-10-10 | 2018-02-27 | 攀钢集团研究院有限公司 | High tough hypereutectoid steel rail and its manufacture method |
| CN108385022A (en) * | 2018-03-30 | 2018-08-10 | 鞍钢股份有限公司 | The corrosion-resistant bainite rail of heavy haul railway high toughness wear resistant and its manufacturing method |
Non-Patent Citations (2)
| Title |
|---|
| 郑沛然: "《炼钢学》", 30 June 1994, 冶金工业出版社 * |
| 陈嵘等: "《城市交通轨道工程》", 31 March 2018, 中国铁道出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261733A (en) * | 2022-08-18 | 2022-11-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Wear-resistant corrosion-resistant steel rail for subway and production method thereof |
| CN115261733B (en) * | 2022-08-18 | 2023-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Abrasion-resistant corrosion-resistant steel rail for subway and production method thereof |
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