WO2008123483A1 - 耐磨耗性と耐疲労損傷性に優れた内部高硬度型パーライト鋼レールおよびその製造方法 - Google Patents
耐磨耗性と耐疲労損傷性に優れた内部高硬度型パーライト鋼レールおよびその製造方法 Download PDFInfo
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- WO2008123483A1 WO2008123483A1 PCT/JP2008/056277 JP2008056277W WO2008123483A1 WO 2008123483 A1 WO2008123483 A1 WO 2008123483A1 JP 2008056277 W JP2008056277 W JP 2008056277W WO 2008123483 A1 WO2008123483 A1 WO 2008123483A1
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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
- 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
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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
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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
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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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
-
- 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
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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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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- 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
- C21D2211/009—Pearlite
Definitions
- the present invention relates to an internal high hardness type pearlitic rail excellent in wear resistance and rolling contact fatigue (RCF) resistance, and a method for producing the same.
- RCF rolling contact fatigue
- the present invention relates to an internal high-hardness pearlite steel rail excellent in wear resistance and fatigue damage resistance that achieves a longer operating life of a lenore used below, and a manufacturing method thereof.
- Japanese Patent Application Laid-Open No. 10-195601 discloses that the rail at the depth of at least 20 mm from the corner of the head and the top of the head is HV370 or more. The service life is improved. Further, in Japanese Patent Laid-Open No. 2003-293086, by controlling a pearlite block, the hardness of at least a depth of 20 mm starting from the rail corner and head surface is Hv 300 to 500. By making it within the range, the service life of the rail is improved. However, the use environment of pearlite steel rails has become more severe, and in order to improve the service life of pearlite steel rails, it has been a challenge to further increase the hardness and expand the range of hardening depth.
- the present invention has been made to solve this problem.
- Mn and Cr were optimized and hardenability index (hereinafter referred to as DI) and carbon equivalent (hereinafter referred to as C eq ) were optimized.
- DI hardenability index
- C eq carbon equivalent
- the inventors manufactured a single-ply steel rail with varying contents of Si, Mn, and Cr, and earnestly examined the structure, hardness, wear resistance, and fatigue damage resistance. investigated.
- the [% Mn] / [% Cr] value calculated from the Mn content [% Mn] and the Cr content [% Cr] should be 0.3 or more and less than 1.0.
- the lamellar spacing is miniaturized, and the internal hardness of the rail head defined by the hardness within the range of at least 25 strokes from the surface of the rail head is Hv380 or more.
- the wear resistance and fatigue damage resistance are improved because the Hv is less than 480.
- the hardenability index ie DI value
- the carbon equivalent ie C eq value
- the Mn content [% Mn] , [% Si] + [% Mn] + [% Cr] calculated from Cr content [% Cr] and Si content [% Si] should be in the range of 1.55 to 2.50% by mass
- the present invention is C: 0.73-0.85 mass%, Si: 0.5-0.75 mass%, Mn: 0.3-1.0 mass 0 P: 0.035 mass% or less, S: 0.0005-0.012 mass 0 Cr: 0.2-1.3 %, With the balance being Fe and inevitable impurities, with Mn content of [% Mn] and Cr content of [% Cr] and [% Mn] / [% Cr] value of 0.3% Abrasion resistance and fatigue damage that is less than 1.0 and the internal hardness of the rail head defined by the Vickers hardness at a depth of at least 25 mm from the surface of the rail head is Hv380 or more and less than Hv480 This is an internal high hardness type pearlite copper rail with excellent properties.
- the C content of the above composition is [% C]
- the Si content is [% Si]
- the Mn content is [% Mn]
- the P content is [%
- the DI value calculated by the following equation (1) satisfies the range of 5.6 to 8.6, where the P] and S contents are [% S] and the Cr content is. it is preferred that C e ⁇ 1 value calculated satisfies a range of 1.04 to 1.27.
- the lamellar spacing of the pearlite layer in the range of a depth of at least 25 mm from the surface layer of the rail head is 0.04 to 0.15 ⁇ m.
- the present invention is to hot-roll a steel material having the above-described composition into a rail shape so that the rolling finishing temperature is 850 to 950 ° C., and then continue the rail head from a temperature equal to or higher than the palai small transformation start temperature 1
- Fig. 1A and Fig. 1B are diagrams showing the Nishihara-type wear test piece for evaluating wear resistance.
- FIG. 1A is a plan view
- FIG. 1B is a side view.
- Figure 2 A cross-sectional view of the rail head showing the sampling position of the Nishihara-type wear test piece.
- Fig. 3A and Fig. 3B are diagrams showing a Nishihara-type wear test piece for evaluating fatigue damage resistance.
- Fig. 3A is a plan view and Fig. 3B is a side view.
- C forms a cementite in the pearlite structure and is an essential element for ensuring wear resistance.
- wear resistance improves.
- it is less than 0.73% by mass, it is difficult to obtain superior wear resistance compared to conventional heat-treated perlite copper rails.
- 0.85 mass If it exceeds / 0 , pro-eutectoid cementite is formed at the austenite grain boundaries during the transformation after hot rolling, and the fatigue damage resistance is significantly reduced. Therefore, the C content is 0.73 to 0.85% by mass. More preferably, it is 0.75 to 0.85% by mass.
- Si must be 0.5% by mass or more as a deoxidant and a strengthening element for the pearlite structure, but if it exceeds 0.75% by mass, weldability deteriorates due to the high bonding strength of Si with oxygen. Furthermore, due to the high hardenability of Si, a martensite structure is likely to form on the surface layer of internal hardened pearlitic steel rails. Therefore, the Si content is 0.5 to 0.75 mass%. More preferably, it is 0.5 to 0.70% by mass.
- Mn contributes to increasing the strength and ductility of internal hardened rails by decreasing the lamellar transformation temperature and reducing the lamellar spacing, but excessive addition reduces the equilibrium transformation temperature of the parrite. As a result, the supercooling degree is reduced and the lamellar spacing is increased. If it is less than 0.3% by mass, a sufficient effect cannot be obtained. If it exceeds 1.0% by mass, a martensite structure is likely to be formed, and the material is liable to be hardened or embrittled during heat treatment and welding. Even if a pearlite structure is formed, the equilibrium transformation temperature is lowered. Incurs coarser mellar spacing. Therefore, the Mn content is 0.3 to 1.0 mass%. More preferably, it is 0.3-0.8 mass%.
- the P content is 0.035% by mass or less. More preferably, it is 0.020 mass% or less.
- S is present in steel materials mainly in the form of A-based inclusions.
- the amount exceeds 0.012% by mass, the amount of inclusions increases remarkably, and at the same time, coarse inclusions are produced, which deteriorates the cleanliness of the steel materials. .
- 0.0005 mass If it is less than 0 , steelmaking costs will increase. Therefore, the S content is 0.0005 to 0.012 mass%. Preferably it is 0.0005-0.010 mass%. More preferably, it is 0.0005-0.008 mass%.
- the Cr is an element that raises the pearlite equilibrium transformation temperature and contributes to the refinement of the lamellar spacing, while at the same time providing higher strength through solid solution strengthening.
- the amount is less than 0.2% by mass, sufficient internal hardness cannot be obtained.
- the amount exceeds 1.3% by mass, the hardenability becomes too high, martensite is generated, and the wear resistance is high. Fatigue damage is reduced. Therefore, the Cr content is 0.2 to 1.3% by mass. Preferably, it is 0.3-1.3 mass%. More preferably, it is 0.5 to 1.3% by mass.
- Mn and Cr added to increase the hardness of internal hardened pearlitic steel rails Element.
- Mn content [% Mn] and the Cr content [% Cr] are both mass 0/0. If the value of [% Mn] / [% Cr] is less than 0.3, the amount of Cr added increases, and because of the high hardenability of Cr, martensite is generated on the surface layer of the internal hardened pearlite steel rail. It becomes easy.
- the value of [% Mn] / [% Cr] is 1.0 or more, the amount of Mn added increases, and because of the high hardenability of Mn, martensite is similarly formed on the surface layer of the internal hardened pearlite copper rail. Is easier to generate.
- the value of [% Mn] / [% Cr] is set to 0.3 or more and less than 1.0, thereby preventing the formation of martensite on the surface layer. It is possible to control the internal hardness of the head (the hardness in the range of at least 25 thigh depth from the head surface layer of the internal high-hardness pearlite steel rail) to the range described later. Therefore, the value of [% Mn] / [% Cr] is 0.3 or more and less than 1.0. Preferably it is 0.3 or more and 0.9 or less.
- the DI value is C content [% C], Si content [% Si], Mn content [% Mn], P content [% P], S content [% S], This is a value calculated by the following formula (1), where Cr content is [% Cr].
- the units L% C], [% Si], [% Mn], [% P], [% S], and [% Cr] are all mass%.
- This DI value represents hardenability and is hardened. Although it is used as an index to judge the quality of the steel, in the present invention, the generation of martensite on the surface layer of the internal high-hardness pearlite steel rail is suppressed and the target value of the internal hardness of the rail head is set. Achieve It is preferable to use it as an index for maintaining it in a suitable range. If the DI 'value is less than 5.6, the desired internal hardness can be obtained, but it will be close to the lower limit of the target hardness range, so further improvement in wear resistance and fatigue damage resistance cannot be expected.
- the DI value exceeds 8.6, the hardenability of the internal hardened pearlite steel rail increases, and martensite is easily generated on the surface layer of the rail head. Therefore, the DI value is preferably 5.6 to 8.6. More preferably, it is 5.6 to 8.2.
- the C eq value is calculated by the following formula (2), where C content is [% C], Si content is [% Si], Mn content is [% Mn], and Cr content is [% Cr]. Is the value to be [% C], [% Si],
- This C eq value is the alloy composition ratio Therefore, in the present invention, the formation of martensite on the surface layer of the internal high-hardness pearlite steel rail is suppressed and the internal hardness of the rail head is used. It is preferable to use it as an index to achieve the target value and maintain it within a suitable range. If the C eq value is less than 1.04, the desired internal hardness can be obtained, but it will be close to the lower limit of the target hardness range, so further improvement in wear resistance and fatigue damage resistance cannot be expected.
- the C eq value exceeds 1.27, the hardenability of the internal high hardness type pearlite steel rail is increased, and martensite is likely to be generated on the surface layer of the rail head. Therefore, the C eq value is preferably 1.04 to 1.27. More preferably, it is 1.04-1.20.
- the internal hardness of the rail head (hardness in the range of depth of at least 25mm from the surface of the head of the internal high hardness type steel steel rail) is Hv380 or more and less than Hv480: If the internal hardness of the rail head is less than Hv380, the wear resistance of the steel will decrease, and the service life of the internal hardened perlite steel rail will decrease.
- the internal hardness of the rail head is Hv380 or more and less than Hv480.
- the definition of the internal hardness of the rail head is at least 25mra depth from the surface layer of the internal high-hardness perlite copper rail head. This is because the wear resistance of the internal high hardness type pearlite copper rail decreases and the service life decreases. More preferably, the internal hardness of the rail head is more than Hv390 and less than Hv480.
- the units of [% Si], [% Mn], and [% Cr] are all mass%.
- V 0.001 to 0.30 mass%, ( ⁇ 1: 1.0 mass% or less, Ni: 1.0 mass% or less, Nb: 0.001 to 0.05 mass% %
- Mo 0.5 mass / 1 or 2 or more selected from 0 or less may be added as necessary.
- V forms carbonitrides, disperses and precipitates in the matrix, and improves wear resistance. If the amount is less than%, the effect is small. On the other hand, if the amount exceeds 0.30% by mass, the workability deteriorates and the production cost increases. In addition, the cost of the alloy increases, which increases the cost of the internal hardened pearlite steel rail. Therefore, when V is added, the amount of V is preferably 0.001 to 0.30% by mass. More preferably, it is 0.001 to 0.15 mass%.
- Cu like Cr, is an element for further strengthening by solid solution strengthening. In order to obtain the effect, addition of Cu of 0.005% by mass or more is preferable. However, Cu cracking tends to occur when the content exceeds 1.0% by mass. Therefore, when adding Cu, the amount of Cu is preferably 1.0% by mass or less. More preferably, it is 0.005 to 0.5 mass%.
- Ni 1.0 mass. /. Less than:
- Ni is an element for increasing the strength without deteriorating the ductility.
- the Ni content is preferably 0.005% or more.
- addition exceeding 1.0% by mass increases the hardenability and produces martensite, which tends to decrease the wear resistance and fatigue damage resistance. Therefore, when adding Ni, the amount of Ni is preferably 1.0% by mass or less. More preferably, it is 0.005 to 0.5% by mass.
- Nb binds to C in the steel and precipitates as carbide during and after rolling, and effectively acts to reduce the size of the pearlite colony.
- wear resistance fatigue damage resistance This greatly contributes to prolonging the service life of internal hardened perlite copper rails.
- addition of 0.001% by mass or more of Nb content is preferable. Even if added in excess of 0.05% by mass, the effect of improving wear resistance and fatigue damage resistance is saturated, and an effect commensurate with the amount added cannot be obtained. Therefore, when adding Nb, the amount of Nb is preferably 0.001 0.05 mass%. More preferably, it is 0.001 0.03 mass%.
- Mo is an element for further strengthening by solid solution strengthening.
- the Mo content is preferably 0.005% by mass or more.
- the amount of Mo is preferably 0.5% by mass or less. More preferably, it is 0.005 0.3% by mass.
- the finer the lamellar spacing of the pearlite layer the higher the hardness of the internal high-hardness pearlite steel rail, which is advantageous from the viewpoint of improving wear resistance and fatigue damage resistance. Since the improvement of these characteristics becomes insufficient, it is preferable to set it to 0.15 ⁇ or less. Also, if the lamellar spacing is set to less than 0.04 // m, a method of improving hardenability and making it finer will be used. In this case, martensite is easily generated on the surface layer and fatigue damage resistance is increased. Adversely affect. Therefore, it is preferably 0.04 / 4m or more.
- a pearlite steel rail that contains other trace component elements within a range that does not substantially affect the function and effect of the present invention instead of a part of the remaining Fe in the composition according to the present invention is also disclosed in the present invention.
- impurities include P, N, 0, and the like, and P can be allowed to be 0.035 mass% as described above.
- N is allowed up to 0.006% by mass
- O is allowed up to 0.004% by mass.
- Ti mixed as impurities can be allowed to be up to 0.0 0 10%.
- Ti forms an oxide and causes a decrease in fatigue damage resistance, which is a basic characteristic of the rail, and therefore, it is preferable to control until Ti becomes 0.0% or less.
- the internal high hardness type pearlite steel rail of the present invention is obtained by hot rolling a steel material having the composition according to the present invention into a rail shape so that the rolling finishing temperature is 850 to 950 ° C. At least the head, temperature force above the pearlite transformation starting temperature, 1.2-5. It is preferred to produce by slack quenching from 400 to 650 ° C at a cooling rate of C / sec. Roll finishing temperature: 850-950 ° C, accelerated cooling rate: 1. 2-5 ° C / sec and cooling stop temperature: 400-650 ° C The following is described. Rolling finishing temperature: 850 ⁇ 950 ° C:
- the rolling finish temperature is lower than 850 ° C, the rolling will be performed to the low-temperature of austenite range, and the austenite grains
- austenite grain size ⁇ austenite grain size
- processing strain 3 ⁇ 4 3 ⁇ 4 '
- degree of elongation of austenite crystal grains becomes remarkable.
- Rearrangement by increased introduction and austenite grain boundary area (dislocation) (austenite grain boundary area ), Pala I Bok nucleation site Bok (pearlite nucleation site) and Caro increase mosquito, Nono 0 one line Bok colonies Sai
- the pearlite colony size is refined, the pearlite transformation start temperature rises due to increased calories at the pearlite nucleation site, and the lamellar spacing of the pearlite layer is coarsened, resulting in a marked decrease in wear resistance.
- the rolling finishing temperature should be 850-950 ° C. Cooling rate from temperature above pearlite transformation start temperature: 1. 2 ⁇ 5 ° C / sec
- the cooling rate should be in the range of 1-2-5 ° C / sec. More preferably, it is 1.2 to 4.6 ° C / second.
- pearlite transformation starting temperature varies depending on the cooling rate, cooling of the range of over 720 ° C in Ingredient scope of the equilibrium transformation temperature in the present invention (equilibrium transformation temperature). That city Metsu 1, the present invention Adopt speed. Cooling stop temperature: 400 ⁇ 650 ° C:
- the cooling stop temperature in order to obtain a homogeneous pallite structure at a cooling rate of 1.2 to 5 ° C / sec, is 70 ° C above the equilibrium transformation temperature. It is preferable to secure a temperature that is at least as low as possible. However, when the cooling stop temperature is less than 400 ° C, the increase in cooling time leads to an increase in the cost of internal hardened pearlite steel rails. Therefore, the cooling stop temperature should be 400-650 ° C. More preferably, it is 450-650 degreeC.
- a round bar of 32mm ⁇ was taken from the head of the normal rail described in JIS E 1101, and heat-treated so that the Vickers hardness (load 98N) was HV390 and the structure was tempered martensite structure. Then, the shape shown in Fig. 1 was processed into a tire test piece.
- the Nishihara-type wear test piece 1 is collected from two places on the rail head 3 as shown in Fig.2. The sample taken from the surface of the rail head 3 is the Nishihara-type wear test piece la, and the sample taken from the inside is the Nishihara-type wear test piece lb.
- the center in the longitudinal direction of the Nishihara style abrasion test specimen lb collected from the inside of the rail head 3 is located at a depth of 24 to 26 sleeps (average value 25 awakening) from the upper surface of the rail head 3.
- Test environment conditions are dry, contact pressure: 1. 4 GPa, slip ratio: —10%, rotation speed: 675 rpm (tire test piece is 750 rpm) 100,000 Measure the amount of wear after rotation.
- the heat-treated pearlite steel rail was adopted as the standard steel when comparing the amount of wear, and the wear resistance was improved when the amount of wear was 10% or less than this standard steel. judge.
- the allowance for improvement in wear resistance was calculated by ⁇ (amount of wear of reference material ⁇ amount of wear of test material) I (amount of wear of reference material)) X 100.
- the contact surface is a curved surface with a radius of curvature of 15 mm
- a Nishihara-style wear test piece 1 with a diameter of 30 mm is taken from the rail head, and rotated by contacting with the tire test piece 2 as shown in FIG. And test.
- the arrows in Fig. 3 indicate the rotation directions of the Nishihara-type wear test piece 1 and the tire test piece 2, respectively.
- Nishihara-type wear test piece 1 is collected from two places on rail head 3. Since the position optiature test piece from which the Nishihara-type wear test piece 1 is collected is the same as described above, the description thereof is omitted.
- the test environment was oil lubrication, contact pressure: 2.2 Gpa, slip rate: -20%, rotation speed: 600 rpm (tire test piece 750 rpm), and the surface of the test piece was observed every 25,000 times.
- the number of rotations at the time when a crack of 5 mm or more has occurred is defined as the fatigue damage life.
- the heat-treated perlite copper rail used as the standard steel for comparing the size of fatigue damage life was adopted, and it was judged that the fatigue damage resistance was improved when the fatigue damage time was 10% or longer than this standard steel. Determine.
- the fatigue damage resistance improvement allowance is ⁇ (the number of rotations until the fatigue damage of the test material-the number of rotations until the fatigue damage of the reference material) I (the number of rotations until the damage of the reference material) ⁇ X 100 Calculated.
- the steel material having the composition shown in Table 1 was rolled and cooled under the conditions shown in Table 2 to produce a perlite steel rail. Cooling was performed only on the rail head and after cooling stopped.
- the pearlite copper rail was evaluated for Vickers hardness, lamellar spacing, wear resistance, and fatigue damage resistance. The results are shown in Table 3.
- the rolling finish temperature in Table 2 shows the value measured by the radiation thermometer for the surface temperature of the rail head side surface on the entry side of the final rolling mill as the finish rolling temperature.
- the cooling stop temperature is the cooling stop temperature obtained by measuring the temperature of the surface layer on the rail head side on the exit side of the cooling facility with a radiation thermometer.
- the cooling rate was defined as the time change in temperature from the start to the end of cooling.
- 0 1 value is 5.6 to 8.6, C eq place, such as 1—B to 1_G, 1—S to 1—U. However, if it satisfies 1. 04 to 1.27, it can be seen that wear resistance and fatigue damage resistance are improved compared to 1 1 H to 1 1 K.
- the rail head Although the hardness at the position 25mm deep from the surface layer of the material satisfies Hv380 or more and less than Hv480, the [% Si] + [% Mn] + [% Cr] value was controlled to 1.55-2.50 mass% No, compared to things. It can be seen that the characteristics of the single-light steel rail deteriorate.
- the steel material having the composition shown in Table 4 was rolled and cooled under the conditions shown in Table 5 to produce a pearlite steel rail. Cooling was performed only on the rail head and after cooling stopped. As with Example 1, this pearlite steel rail was evaluated for Vickers hardness, lamellar spacing, wear resistance, and fatigue damage resistance. The results are shown in Table 6.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2679556A CA2679556C (en) | 2007-03-28 | 2008-03-25 | Internal high hardness type pearlitic rail with excellent wear resistance and rolling contact fatigue resistance and method for producing same |
EP08739394.8A EP2135966B1 (en) | 2007-03-28 | 2008-03-25 | Pearlite steel rail of high internal hardness type excellent in wear resistance and fatigue failure resistance and process for production of the same |
AU2008235820A AU2008235820B8 (en) | 2007-03-28 | 2008-03-25 | Internal high hardness type pearlitic rail with excellent wear resistance and rolling contact fatigue resistance and method for producing same |
CN2008800105256A CN101646795B (zh) | 2007-03-28 | 2008-03-25 | 耐磨损性和耐疲劳损伤性优良的内部高硬度型珠光体钢轨及其制造方法 |
US12/593,463 US7955445B2 (en) | 2007-03-28 | 2008-03-25 | Internal high hardness type pearlitic rail with excellent wear resistance and rolling contact fatigue resistance and method for producing same |
Applications Claiming Priority (4)
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CN101646795B (zh) | 2011-04-27 |
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EP2135966A4 (en) | 2012-01-04 |
AU2008235820B8 (en) | 2011-01-20 |
US7955445B2 (en) | 2011-06-07 |
AU2008235820A1 (en) | 2008-10-16 |
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CN101646795A (zh) | 2010-02-10 |
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