CA2687438A1 - Internal high hardness type pearlitic rail with excellent wear resistance, rolling contact fatigue resistance, and delayed fracture property and method for producing same - Google Patents

Internal high hardness type pearlitic rail with excellent wear resistance, rolling contact fatigue resistance, and delayed fracture property and method for producing same Download PDF

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Publication number
CA2687438A1
CA2687438A1 CA002687438A CA2687438A CA2687438A1 CA 2687438 A1 CA2687438 A1 CA 2687438A1 CA 002687438 A CA002687438 A CA 002687438A CA 2687438 A CA2687438 A CA 2687438A CA 2687438 A1 CA2687438 A1 CA 2687438A1
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CA
Canada
Prior art keywords
content
mass
high hardness
internal high
rail
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002687438A
Other languages
French (fr)
Other versions
CA2687438C (en
Inventor
Minoru Honjo
Tatsumi Kimura
Shinichi Suzuki
Kimihiro Nishimura
Nobuo Shikanai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Jfe Steel Corporation
Minoru Honjo
Tatsumi Kimura
Shinichi Suzuki
Kimihiro Nishimura
Nobuo Shikanai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jfe Steel Corporation, Minoru Honjo, Tatsumi Kimura, Shinichi Suzuki, Kimihiro Nishimura, Nobuo Shikanai filed Critical Jfe Steel Corporation
Publication of CA2687438A1 publication Critical patent/CA2687438A1/en
Application granted granted Critical
Publication of CA2687438C publication Critical patent/CA2687438C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • 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
    • 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
    • C21D2221/00—Treating localised areas of an article
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/02—Edge parts

Abstract

The invention provides a pearlite steel rail of high internal hardness type which is excellent in wear resistance, fatigue failure resistance, and delayed fracture resistance; and a process suitable for the production of the rail. Specifically, a pearlite steel rail which has a composition containing by mass C: 0.73 to 0.85%, Si: 0.5 to 0.75%, Mn: 0.3 to 1.0%, P: 0.035% or below, S: 0.0005 to 0.012%, Cr: 0.2 to 1.3%, V: 0.005 to 0.12%, and N: 0.0015 to 0.0060% with the balance consisting of Fe and unavoidable impurities and having a [%Mn]/[%Cr] ratio of 0.3 or above and below 1.0 (wherein [%Mn] is Mn content and [%Cr] is Cr content) and a [%V]/[%N] ratio of 8.0 to 30.0 (wherein [%V] is V content and [%N] is N content) and whose railhead exhibits an internal hardness of Hv380 or above and below Hv480 in terms of Vickers hardness (Hv) in a depth range of at least 25mm from the railhead surface.

Claims (6)

1. An internal high hardness type pearlitic rail comprising a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, 0.005% to 0.12% by mass V, 0.0015% to 0.0060% by mass N, and the balance being Fe and incidental impurities, wherein the value of [%Mn]/[%Cr] is greater than or equal to 0.3 and less than 1.0, where [%Mn] represents the Mn content, and [%Cr] represents the Cr content, and the value of [%V]/[%N] is in the range of 8.0 to 30.0, where [%V]
represents the V content, and [%N] represents the N content, and wherein the internal hardness of a rail head is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm and is greater than or equal to 380Hv and less than 480Hv.
2. The internal high hardness type pearlitic rail according to Claim 1, wherein the value of DI calculated from expression (1) is in the range of 5.6 to 8.6, and the value of Ceq calculated from expression (2) is in the range of 1.04 to 1.27, DI = (0.548[%C]1/2) × (1 + 0.64[%Si]) × (1 + 4.1[%Mn]) × (1 +
2.83[%P]) × (1 - 0.62[%S]) × (1 + 2.23[%Cr]) × (1 +
1.82[%V]) (1); and C eq = [%C] + ([%Si]/11) + ([%Mn]/7) + ([%Cr]/5.8) + [%V]
(2) where [%C] represents the C content, [%Si] represents the Si content, [%Mn] represents the Mn content, [%P] represents the P content, [%S] represents the S content, [%Cr]
represents the Cr content, and [%V] represents the V content of the composition.
3. The internal high hardness type pearlitic rail according to Claim 1 or 2, wherein the value of [%Si] +
[%Mn] +[%Cr] is in the range of 1.55% to 2.50, where [%Si]
represents the Si content, [%Mn] represents the Mn content, and [%Cr] represents the Cr content of the composition.
4. The internal high hardness type pearlitic rail according to any one of Claims 1 to 3, wherein the composition further contains one or two or more selected from 1.0% by mass or less Cu, 1.0% by mass or less Ni, 0.001% to 0.05% by mass Nb, and 0.5% by mass or less Mo.
5. The internal high hardness type pearlitic rail according to any one of Claims 1 to 4, wherein the lamellar spacing of a pearlite layer in the portion located from the surface layer of the rail head to a depth of at least 25 mm is in the range of 0.04 to 0.15 µm.
6. A method for producing an internal high hardness type pearlitic rail, the method comprising hot-rolling a steel material having the composition according to any one of Claims 1 to 4 to form a rail in such a manner that the finishing rolling temperature is in the range of 850°C to 950°C, and then slack-quenching the surface of the rail head from a temperature equal to or higher than a pearlite transformation starting temperature to 400°C to 650°C at a cooling rate of 1.2 to 5 °C/s.
CA2687438A 2007-10-10 2008-03-25 Internal high hardness type pearlitic rail with excellent wear resistance, rolling contact fatigue resistance, and delayed fracture property and method for producing same Active CA2687438C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007-264826 2007-10-10
JP2007264826 2007-10-10
PCT/JP2008/056273 WO2009047926A1 (en) 2007-10-10 2008-03-25 Pearlite steel rail of high internal hardness type excellent in wear resistance, fatigue failure resistance and delayed fracture resistance and process for production of the same

Publications (2)

Publication Number Publication Date
CA2687438A1 true CA2687438A1 (en) 2009-04-16
CA2687438C CA2687438C (en) 2012-12-18

Family

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Family Applications (1)

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CA2687438A Active CA2687438C (en) 2007-10-10 2008-03-25 Internal high hardness type pearlitic rail with excellent wear resistance, rolling contact fatigue resistance, and delayed fracture property and method for producing same

Country Status (7)

Country Link
US (1) US20100186857A1 (en)
EP (1) EP2196552B1 (en)
JP (1) JP5292875B2 (en)
CN (1) CN101743334B (en)
AU (1) AU2008310503B2 (en)
CA (1) CA2687438C (en)
WO (1) WO2009047926A1 (en)

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JP5145795B2 (en) * 2006-07-24 2013-02-20 新日鐵住金株式会社 Method for producing pearlitic rails with excellent wear resistance and ductility
US8241442B2 (en) 2009-12-14 2012-08-14 Arcelormittal Investigacion Y Desarrollo, S.L. Method of making a hypereutectoid, head-hardened steel rail
JP5459453B1 (en) * 2012-04-23 2014-04-02 新日鐵住金株式会社 rail
CN105051220B (en) 2013-03-27 2017-05-31 杰富意钢铁株式会社 The manufacture method of pearlite steel rail and pearlite steel rail
CA2938938C (en) * 2014-02-26 2020-02-25 Nippon Steel & Sumitomo Metal Corporation Rail vehicle axle
US9670570B2 (en) 2014-04-17 2017-06-06 Evraz Inc. Na Canada High carbon steel rail with enhanced ductility
WO2015182759A1 (en) * 2014-05-29 2015-12-03 新日鐵住金株式会社 Rail and production method therefor
CN106460117A (en) * 2014-06-11 2017-02-22 杰富意钢铁株式会社 Wheel for railroad car and method for manufacturing wheel for railroad car
CN104060187B (en) * 2014-07-14 2016-08-17 攀钢集团攀枝花钢铁研究院有限公司 The micro alloyed steel of corrosion resistance and rail and preparation method thereof
CN104213037A (en) * 2014-09-07 2014-12-17 钢铁研究总院 High-nitrogen pearlitic steel
BR112017015008A2 (en) * 2015-01-23 2018-01-23 Nippon Steel & Sumitomo Metal Corporation rail
CN105154773B (en) * 2015-07-23 2017-03-08 攀钢集团攀枝花钢铁研究院有限公司 A kind of heavy haul railway rail and its production method and application
CN104988405B (en) * 2015-07-23 2017-03-08 攀钢集团攀枝花钢铁研究院有限公司 A kind of passenger-cargo mixed utilization rail and its production method and application
CN105112786B (en) * 2015-09-29 2017-04-12 燕山大学 Super pearlite steel for steel rails and method for preparing super pearlite steel
WO2017104719A1 (en) * 2015-12-15 2017-06-22 Ｊｆｅスチール株式会社 Method for selecting rail steel and wheel steel
CN105838981A (en) * 2016-05-20 2016-08-10 金轮针布(江苏)有限公司 Steel for card clothing
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CN108048746A (en) * 2017-12-26 2018-05-18 苏州贝尔纳德铁路设备有限公司 A kind of high-intensity switch rail and preparation method thereof
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JP6852761B2 (en) * 2018-10-26 2021-03-31 Ｊｆｅスチール株式会社 Rails and their manufacturing methods
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Also Published As

Publication number Publication date
WO2009047926A1 (en) 2009-04-16
EP2196552A1 (en) 2010-06-16
US20100186857A1 (en) 2010-07-29
EP2196552A4 (en) 2015-12-23
AU2008310503A1 (en) 2009-04-16
CN101743334B (en) 2012-04-04
AU2008310503B2 (en) 2010-12-09
CA2687438C (en) 2012-12-18
JP2009108396A (en) 2009-05-21
CN101743334A (en) 2010-06-16
EP2196552B1 (en) 2017-05-10
JP5292875B2 (en) 2013-09-18

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