WO2011120517A1 - Aciers pour rails quasi-eutectoïdes, à résistance ultra-élevée et résistants à l'usure - Google Patents

Aciers pour rails quasi-eutectoïdes, à résistance ultra-élevée et résistants à l'usure Download PDF

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Publication number
WO2011120517A1
WO2011120517A1 PCT/DE2011/075058 DE2011075058W WO2011120517A1 WO 2011120517 A1 WO2011120517 A1 WO 2011120517A1 DE 2011075058 W DE2011075058 W DE 2011075058W WO 2011120517 A1 WO2011120517 A1 WO 2011120517A1
Authority
WO
WIPO (PCT)
Prior art keywords
mass
rail steel
rail
mpa
steel according
Prior art date
Application number
PCT/DE2011/075058
Other languages
German (de)
English (en)
Inventor
Georg Frommeyer
Klaus Brokmeier
Original Assignee
Max-Planck-Institut Für Eisenforschung GmbH
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 Max-Planck-Institut Für Eisenforschung GmbH filed Critical Max-Planck-Institut Für Eisenforschung GmbH
Publication of WO2011120517A1 publication Critical patent/WO2011120517A1/fr

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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
    • 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
    • C22C38/04—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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

Definitions

  • the present invention relates to a high-strength and wear-resistant rail steel, a method for its production and the use of rail steel for tracks and points heavily used rail lines, high-speed lines, heavy load lines for freight transport and craneways of overhead cranes, gantry and special cranes.
  • European Patent Application EP 2 135 966 discloses a pearlitic rail steel which has from 0.73 to 0.85 mass% C, 0.5 to 0.75 mass% Si, 0.3 to 1.0 mass % Mn, ⁇ 0.035 mass% P, 0.0005 to 0.012 mass% S and 0.2 to 1.3 mass% Cr.
  • the hardness in the region of the rail surface could be improved to a depth of at least 25 mm when combined with hypoeutectoid, eutectoid, and eutectoid hypereutectoid perlitic rail steels.
  • an inner hardness of the pearlitic steel type rail steel having good abrasion resistance and fatigue resistance of the rolling contact should be achieved.
  • the present invention has for its object to provide an ultra-high strength and wear-resistant rail steel available, which has over the prior art improved properties.
  • the present invention accordingly provides a quasiperlitic or slightly underperlitic rail steel which contains the following alloy constituents:
  • the present invention provides ultra-high-strength and wear-resistant natural-hard bar steels which have a quasi-perlitic (quasi-eutectoid) or slightly underperlitic (hypoeutectoid) structure.
  • the addition of aluminum has been found to shift the eutectoid / eutectoid composition of iron-carbon steels to higher carbon contents.
  • the eutectoid transformation temperature of the three-phase equilibrium becomes: ⁇ -Fe-> ⁇ -Fe + Fe 3 C
  • the abrasion resistance of the rail steels according to the invention can be further improved if the alloy contains, as further alloying additions, Ti in an amount of 0.012 to 0.03% by mass and V in an amount of 0.01 to 0.08% by mass.
  • steel alloys contain impurities such as P, S and H.
  • impurities such as P, S and H.
  • these impurities should be present only in minor amounts, so should P in an amount of up to 0.035 weight percent, S in an amount up to 0.030 mass% and H in an amount be contained up to 2.5 ppm.
  • a-Fe Fe 3 C finely lamellar pearlitic structure
  • the alloy contains vanadium as an alloying additive, the volume fractions of cementite fins of VFe 3 C are> 23% by volume, preferably from 23 to 30% by volume.
  • the rail steels according to the invention show a significant increase in yield stress and strength.
  • they Preferably, they have tensile strength values (Rm) of 1200 MPa to 1650 MPa. Even at high strength values, elongations at break (A) of up to 13% can still be achieved.
  • the 2-stretch limit (R P 0.2) is preferably between 875 MPa and 1 150 MPa.
  • C values) are at room temperature, ie at 20 ° C., preferably at about> 50 MPa m 1/2 , in particular between 55 and 70 MPa m 1/2 and the stress intensity factor at -60 ° C. preferably above about 35 MPa m 1/2 and at -40 ° C preferably above about 45 MPa m 1/2 .
  • at room temperature C 60 to 75 MPa m 1/2 .
  • These improved fracture toughnesses provide significantly improved resistance to rolling and fretting wear compared to the high strength bainitic rails.
  • the rail steel according to the invention exhibits a high hardness, which is preferably between 375 and 475 HB 18 7.5 / 2.5. Due to the high strength of the resulting microlamellar structure, the spread of fatigue cracks can be prevented and results overall in a good resistance to wear, such as the ribbing, periodic wear of the running surface, unevenness (wave and wave formation) with small and large wavelengths ⁇ of 80 mm ⁇ ⁇ 300 mm or 300 mm ⁇ ⁇ 2500 mm and varying depths of the troughs with burrs of 4 mm to 1, 5 mm, pitting as a result of high Hertzian surface pressure and headcheck sequence of driving edge cracks.
  • Another object of the present invention a method for producing rail steel with a quasiperlitic or slightly subperlitic structure containing
  • a molten steel produced by conventional methods can be used.
  • steel melts are produced according to the Linz-Donawitz process (LD process) or according to the Linz Donawitz Arbed Center National process (LDAC process).
  • LD process Linz-Donawitz process
  • LDAC process Linz Donawitz Arbed Center National process
  • the melt is degassed, usually by applying a vacuum. If present, then oxygen and oxidic compounds are removed, for example by AI or an Al / Fe master alloy or Ca, z. B. as Ca-spooled wire, are added.
  • the melt can subsequently be rinsed with inert gas, such as argon, and settled slag removed.
  • the thus prepared melt is then mixed with the alloying metals and additives and cast.
  • the cast melt is cured in a conventional manner and further processed.
  • the casting of the melt is usually carried out in a continuous casting process.
  • the castings obtained can be further processed with conventional rolling techniques to the respective end products.
  • the rail steels according to the invention are suitable as ultra high-strength and wear-resistant rail steels for Vignol- and / or grooved rails including the associated rail switches and frog points, the track for conventionally traveled rail lines, high-speed rail and rail freight with high axle loads (heavy traffic) and crane runways of overhead cranes, gantry and special cranes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention a pour objet un acier pour rails quasi-perlitique ou légèrement sous-perlitique qui contient les constituants suivants : 0,85 à 1,3 % en masse de C, 0,50 à 3,00 % en masse d'AI, 0,30 à 1,00 % en masse de Cr, 0,30 à 1,00 % en masse de Mn, 0,20 à 0,60 % en masse de Si ainsi que des impuretés liées à la fabrication.
PCT/DE2011/075058 2010-03-31 2011-03-30 Aciers pour rails quasi-eutectoïdes, à résistance ultra-élevée et résistants à l'usure WO2011120517A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010016282.5 2010-03-31
DE201010016282 DE102010016282A1 (de) 2010-03-31 2010-03-31 Ultrahochfeste und verschleißresistente quasieutektoide Schienenstähle

Publications (1)

Publication Number Publication Date
WO2011120517A1 true WO2011120517A1 (fr) 2011-10-06

Family

ID=44116197

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2011/075058 WO2011120517A1 (fr) 2010-03-31 2011-03-30 Aciers pour rails quasi-eutectoïdes, à résistance ultra-élevée et résistants à l'usure

Country Status (2)

Country Link
DE (1) DE102010016282A1 (fr)
WO (1) WO2011120517A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113088805A (zh) * 2021-02-23 2021-07-09 江阴兴澄特种钢铁有限公司 一种经济型高耐磨钢球及其制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002069585A (ja) * 2000-06-14 2002-03-08 Nippon Steel Corp 耐摩耗性および耐内部疲労損傷性に優れたパーライト系レールおよびその製造法
JP2003293086A (ja) * 2002-04-05 2003-10-15 Nippon Steel Corp 耐摩耗性および延性に優れたパーライト系レール
WO2005085481A1 (fr) * 2004-03-09 2005-09-15 Nippon Steel Corporation Procede de production de rails d'acier a haute teneur en carbone tres resistant a l'usure et tres ductile
US20080011393A1 (en) * 2002-04-05 2008-01-17 Masaharu Ueda Pearlitic steel rail excellent in wear resistance and ductility and method for producing same
EP2135966A1 (fr) 2007-03-28 2009-12-23 JFE Steel Corporation Rail en acier perlitique de type à dureté interne élevée présentant une excellente résistance à l'usure et une excellente résistance à la rupture par fatigue, et son procédé de fabrication

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4272437B2 (ja) * 2003-01-20 2009-06-03 新日本製鐵株式会社 高炭素鋼レールの製造方法
JP4272410B2 (ja) * 2002-11-12 2009-06-03 新日本製鐵株式会社 パーライトレールの熱処理方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002069585A (ja) * 2000-06-14 2002-03-08 Nippon Steel Corp 耐摩耗性および耐内部疲労損傷性に優れたパーライト系レールおよびその製造法
JP2003293086A (ja) * 2002-04-05 2003-10-15 Nippon Steel Corp 耐摩耗性および延性に優れたパーライト系レール
US20080011393A1 (en) * 2002-04-05 2008-01-17 Masaharu Ueda Pearlitic steel rail excellent in wear resistance and ductility and method for producing same
WO2005085481A1 (fr) * 2004-03-09 2005-09-15 Nippon Steel Corporation Procede de production de rails d'acier a haute teneur en carbone tres resistant a l'usure et tres ductile
EP2135966A1 (fr) 2007-03-28 2009-12-23 JFE Steel Corporation Rail en acier perlitique de type à dureté interne élevée présentant une excellente résistance à l'usure et une excellente résistance à la rupture par fatigue, et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113088805A (zh) * 2021-02-23 2021-07-09 江阴兴澄特种钢铁有限公司 一种经济型高耐磨钢球及其制造方法

Also Published As

Publication number Publication date
DE102010016282A1 (de) 2011-10-06

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