EP1003920B1 - Procede de fabrication d'un element de voie a resistance elevee, et element de voie ainsi obtenu - Google Patents

Procede de fabrication d'un element de voie a resistance elevee, et element de voie ainsi obtenu Download PDF

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Publication number
EP1003920B1
EP1003920B1 EP98943853A EP98943853A EP1003920B1 EP 1003920 B1 EP1003920 B1 EP 1003920B1 EP 98943853 A EP98943853 A EP 98943853A EP 98943853 A EP98943853 A EP 98943853A EP 1003920 B1 EP1003920 B1 EP 1003920B1
Authority
EP
European Patent Office
Prior art keywords
steel
temperature
cooled
basic structure
process according
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.)
Expired - Lifetime
Application number
EP98943853A
Other languages
German (de)
English (en)
Other versions
EP1003920A1 (fr
Inventor
Gerhard Ratz
Walter Kunitz
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.)
Voestalpine Turnout Technology Germany GmbH
Original Assignee
Voestalpine BWG GmbH
Butzbacher Weichenbau 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 Voestalpine BWG GmbH, Butzbacher Weichenbau GmbH filed Critical Voestalpine BWG GmbH
Publication of EP1003920A1 publication Critical patent/EP1003920A1/fr
Application granted granted Critical
Publication of EP1003920B1 publication Critical patent/EP1003920B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B7/00—Switches; Crossings
    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C22C38/18—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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite

Definitions

  • the invention relates to a method for producing a high-strength track part made of steel, in particular soft parts such as the centerpiece, tongue or wing rail.
  • the invention further relates to a switch component which is made of steel.
  • Rails and switches in particular should have a high resistance to wear, crushing and fatigue damage. Break resistance and suitability for welding should also be provided. These requirements have given rise to the use of rails with a minimum tensile strength of 1100 N / mm 2 .
  • a track part or a method for producing such is known in which a vacuum-treated steel with 0.53 to 0.52% C, 0.1 to 0.25 Si, 0.65 to 1 , 1% Mn, 0.8 to 1.3% Cr, 0.05 to 0.11% Mo, 0.05% to 0.11% V, ⁇ 0.02% P, optionally up to 0.025% Al, optionally up to 0.5% Nb, remainder iron and usual melting-related impurities, the ratio of Mn: Cr being about 0.80 ⁇ Mn: Cr ⁇ 0.85 and the ratio of Mo: V being about 1, and wherein Track part in the form of a switch section is a rolled rail section as the starting material, which has a martensitic structure, at least in the rail head, through tempering. This results in strengths of over 1500 N / mm 2 in the rail head.
  • the present invention is based on the problem of further developing a method for producing a track part of the type mentioned at the outset or a switch component itself in such a way that high strength and yield strength are obtained with an increase in the service life, so that it can be used in particular in high-stress switches.
  • the problem is solved in that steel undergoes a chemical directional analysis with 0.3 to 0.6% C, 0.8 to 1.5% Si, 0.7 to 1.0% Mn, 0.9 to 1.4 % Cr, 0.6 to 1.0% Mo, remainder iron and usual fusion-related combinations after cooling from the rolling heat and formation of a bainitic basic structure with a tensile strength of approximately 1100 N / mm 2 is first subjected to a pretreatment step by the steel with the bainitic basic structure is heated to a temperature T 4 with 400 ° C. ⁇ T 4 ⁇ 550 ° C.
  • the steel has a tensile strength of at least 1200 N / mm 2 after the pretreatment, and then to a temperature T 1 750 ° C ⁇ T 1 ⁇ 920 ° C heated, then accelerated to a temperature T 2 with 450 ° C ⁇ T 2 ⁇ 250 ° C in a polymer-water mixture, in a molten salt or in a powder, again to a temperature T. 3 > T 2 with 400 ° C ⁇ T 3 ⁇ 560 ° C t and kept at temperature T 3 for a time t 1 with 60 min ⁇ t 1 ⁇ 150 min and then cooled to room temperature.
  • the steel is heated to a temperature T 1 of in particular approximately 860 ° C. after a specific cooling from the rolling heat and formation of the basic bainitic structure with a tensile strength of approximately 1100 N / mm 2 , in order to subsequently accelerate the steel to the Cool the temperature T 2 and expose it to a cooling medium so that the core of the steel has cooled to the temperature T 2 .
  • the steel with a bainitic basic structure with usual Rail steels such as 900 A and S 1100 connected by flash butt welding can be, the connected, track parts following a common Can be subjected to heat treatment.
  • the volume of a steel bainitic basic structure is tempered, with targeted heat treatment allowing tensile strengths of up to 1700 N / mm 2 , yield strengths (technical yield strengths with 0.2% permanent elongation) to 1400 N / mm 2 , elongation at break A 5 (%) result in more than 10 and constrictions of more than 25%.
  • a switch component made of steel, manufactured according to the previously described method, is characterized in that the track part made of steel is subjected to a chemical directional analysis with 0.3 to 0.6% C, 0.8 to 1.5% Si, 0.7 to 1 , 0% Mn, 0.9 to 1.4 % Cr, 0.6 to 1.0% Mo, remainder iron as well as usual fusion-related impurities, a bainitic basic structure, a tensile strength of more than 1600 N / mm 2 and one technical yield strength of more than 1250 N / mm 2 has an elongation at break> 10% and a constriction> 25%.
  • the steel has a chemical directional analysis of 0.4 to 0.5% C, approximately 1% Si, approximately 0.8% Mn, approximately 1.0% Cr and 0.6 to 1.0% Mo , where the strength is up to 1700 N / mm 2 and the yield strength is up to 1400 N / mm 2 .
  • the steel is heat-treated in such a way that the elongation at break is> 10% and the constriction is> 25%.
  • a steel with a chemical directional analysis of 0.45% C, 1% Si, 0.8% Mn, 1% Cr, 0.8% Mo, remainder iron as well as usual fusion-related impurities is formed into a track part by rolling in order to be controlled Cooling from the rolling heat to achieve a structure with a bainitic basic structure and a strength of approximately 1100 N / mm 2 .
  • the switch component cooled to room temperature is then heated in a heat treatment furnace to a temperature of approximately 500 ° C. in order to achieve a strength of 1300 to 1400 N / mm 2 by subsequent controlled cooling.
  • the switch component is then heated to approx. 860 ° C. After reaching this temperature in the core of the switch component, the polymer-water mixture cools down to about 350 ° C.
  • a corresponding switch component is sodarm with a UIC 900 A rail or UIC S 1100 connected by flash butt welding and in a track been installed. Regular checks showed a high wear resistance, which, compared to conventional switch components, increase the stability of showed in about 50%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Forging (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Details Of Garments (AREA)
  • Magnetic Heads (AREA)

Claims (8)

  1. Procédé de fabrication d'un élément de voie très résistant en acier notamment d'un élément de voie telle qu'une pointe d'aiguille, une patte de lièvre ou un coeur de croisement,
    caractérisé en ce que
    l'acier présente selon une analyse chimique, entre 0,3 à 0,6 % C, 0,8 à 1,5 % Si, 0,7 à 1,0 % Mn, 0,9 à 1,4 % Cr, 0,6 à 1,0 % Mo, le reste étant du fer et les impuretés habituelles liées à la fusion, et après refroidissement à partir de la température de laminage et réalisation d'un réseau de base bainitique, une résistance en traction d'environ 1100 N/mm2,
    on le soumet tout d'abord à une étape de traitement préalable en chauffant l'acier à structure de base bainitique, à une température T4 telle que 400°C < T4 < 550°C,
    puis on refroidit de manière commandée pour qu'après le traitement préalable, l'acier présente une résistance à la traction d'au moins 1200 N/mm2, puis à une température T1 telle que 750°C < T1 < 920°C et ensuite à une température T2 telle que 450°C < T2 < 250°C dans un mélange d'eau et de polymère, dans un bain de sels ou dans une poudre pour accélérer le refroidissement et,
    on chauffe de nouveau à une température T3 > T2 telle que 400°C < T3 < 560°C et on maintient à la température T3 pendant un temps t1 tel que (60 minutes) < t1 < (150 minutes) et ensuite on refroidit à la température ambiante.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'
    on refroidit l'acier à structure de base bainitique de la température T1 à la température T2, de préférence dans un puits d'aluminium.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce qu'
    après avoir atteint la température T1 à coeur, on maintient l'acier pendant une durée t2 telle que (10 minutes) < t2 < (30 minutes) notamment t2 égal à environ 20 minutes à cette température.
  4. Procédé selon au moins l'une des revendications précédentes,
    caractérisé en ce qu'
    on chauffe l'acier à une température T1 notamment de l'ordre de 860°C, puis on refroidit l'acier de manière rapide à la température T2 et on l'expose à un fluide de refroidissement de façon à refroidir le coeur de l'acier à la température T2.
  5. Procédé selon au moins l'une des revendications précédentes,
    caractérisé en ce qu'
    on refroidit l'acier de manière commandée dans l'étape de prétraitement pour que l'acier après le prétraitement présente une résistance à la traction comprise entre 1300 N/mm2 et 1400 N/mm2.
  6. Procédé selon au moins l'une des revendications précédentes,
    caractérisé en ce qu'
    on relie l'acier à réseau de base bainitique avec des aciers de rail, usuels tels que 900 A et S 1100, par soudage par étincelage et les éléments de voie ainsi reliés sont ensuite soumis à un traitement thermique commun.
  7. Elément de voie en acier fabriqué selon le procédé au moins selon la revendication 1,
    caractérisé en ce que
    l'élément de voie est réalisé en acier ayant une composition selon une analyse chimique correspondant à 0,3-0,6 % C, 0,8-1,5 % Si, 0,7-1,0 % Mn, 0,9-1,4 % Cr, 0,6-1,0 % Mo et le reste du fer ainsi que les impuretés habituelles liées à la fusion, un réseau bainitique, une résistance à la traction supérieure à 1600 N/mm2 et une limite d'allongement technique supérieure à 1250 N/mm2 et un allongement à la rupture supérieur à 10 % et une striction supérieure à 25 %.
  8. Elément de voie selon la revendication 6,
    caractérisé en ce qu'
    il est en acier ayant une composition obtenue par analyse chimique de 0,4-0,5 % C, environ 1 % Si, environ 0,8 % Mn, environ 1,0 Cr et de 0,6 et 1,0 % Mo et le reste est du fer ainsi que les usuelles impuretés liées à la fusion, et l'acier présente une résistance à la traction allant jusqu'à 1700 N/mm2 et une limite d'allongement technique allant jusqu'à 1400 N/mm2.
EP98943853A 1997-08-14 1998-08-06 Procede de fabrication d'un element de voie a resistance elevee, et element de voie ainsi obtenu Expired - Lifetime EP1003920B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19735285A DE19735285C2 (de) 1997-08-14 1997-08-14 Verfahren zur Herstellung eines Gleisteils
DE19735285 1997-08-14
PCT/EP1998/004894 WO1999009222A1 (fr) 1997-08-14 1998-08-06 Procede de fabrication d'un element de voie a resistance elevee, et element de voie ainsi obtenu

Publications (2)

Publication Number Publication Date
EP1003920A1 EP1003920A1 (fr) 2000-05-31
EP1003920B1 true EP1003920B1 (fr) 2001-12-05

Family

ID=7838988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98943853A Expired - Lifetime EP1003920B1 (fr) 1997-08-14 1998-08-06 Procede de fabrication d'un element de voie a resistance elevee, et element de voie ainsi obtenu

Country Status (11)

Country Link
US (1) US6315844B1 (fr)
EP (1) EP1003920B1 (fr)
AT (1) ATE210197T1 (fr)
AU (1) AU736649B2 (fr)
DE (2) DE19735285C2 (fr)
DK (1) DK1003920T3 (fr)
ES (1) ES2169547T3 (fr)
NO (1) NO20000707L (fr)
PL (1) PL189758B1 (fr)
PT (1) PT1003920E (fr)
WO (1) WO1999009222A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012126550A1 (fr) 2011-03-23 2012-09-27 Db Netz Ag Procédé de reforgeage d'un élément de voie ferrée et éléments de voie ferrée reforgés suivant ledit procédé

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10313957A1 (de) * 2002-06-27 2004-01-22 Bwg Gmbh & Co. Kg Verfahren zum Beschichten einer Fläche eines Gleisbauteils sowie Gleisbauteil
DE102004048751B3 (de) * 2004-08-11 2005-12-29 Schreck-Mieves Gmbh Zungenvorrichtung
WO2013110798A1 (fr) * 2012-01-25 2013-08-01 Tata Steel Uk Ltd Acier pour la production de pièces destinées aux voies ferrées, aux croisements et aiguillages ferroviaires, et procédé destiné à la production desdites pièces
CN103898310B (zh) * 2014-04-04 2016-08-10 攀钢集团攀枝花钢铁研究院有限公司 一种贝氏体钢轨焊接接头的焊后热处理方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1239110B (de) * 1965-10-02 1967-04-20 Kloeckner Werke Ag Verwendung einer hochverschleissfesten Schienenstahllegierung
JPH0730401B2 (ja) * 1986-11-17 1995-04-05 日本鋼管株式会社 靭性の優れた高強度レ−ルの製造方法
DE4200545A1 (de) 1992-01-11 1993-07-15 Butzbacher Weichenbau Gmbh Gleisteile sowie verfahren zur herstellung dieser
AU663023B2 (en) * 1993-02-26 1995-09-21 Nippon Steel Corporation Process for manufacturing high-strength bainitic steel rails with excellent rolling-contact fatigue resistance
GB2297094B (en) * 1995-01-20 1998-09-23 British Steel Plc Improvements in and relating to Carbide-Free Bainitic Steels
DE19621018C1 (de) * 1996-05-24 1997-10-16 Butzbacher Weichenbau Gmbh Gleisoberbauteil sowie Verfahren zur Herstellung eines solchen
AT407057B (de) * 1996-12-19 2000-12-27 Voest Alpine Schienen Gmbh Profiliertes walzgut und verfahren zu dessen herstellung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012126550A1 (fr) 2011-03-23 2012-09-27 Db Netz Ag Procédé de reforgeage d'un élément de voie ferrée et éléments de voie ferrée reforgés suivant ledit procédé
DE102011014877A1 (de) 2011-03-23 2012-09-27 Db Netz Ag Verfahren zum Umschmieden eines Gleisteils und gemäß diesem Verfahren umgeschmidete Gleisteile

Also Published As

Publication number Publication date
PL189758B1 (pl) 2005-09-30
WO1999009222A1 (fr) 1999-02-25
EP1003920A1 (fr) 2000-05-31
PT1003920E (pt) 2002-05-31
AU736649B2 (en) 2001-08-02
DE19735285A1 (de) 1999-02-18
DK1003920T3 (da) 2002-04-02
US6315844B1 (en) 2001-11-13
DE59802362D1 (de) 2002-01-17
ATE210197T1 (de) 2001-12-15
DE19735285C2 (de) 2001-08-23
AU9159598A (en) 1999-03-08
PL338544A1 (en) 2000-11-06
ES2169547T3 (es) 2002-07-01
NO20000707D0 (no) 2000-02-11
NO20000707L (no) 2000-02-11

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