EP0610460A1 - Procede de traitement thermique de rails - Google Patents

Procede de traitement thermique de rails

Info

Publication number
EP0610460A1
EP0610460A1 EP93914544A EP93914544A EP0610460A1 EP 0610460 A1 EP0610460 A1 EP 0610460A1 EP 93914544 A EP93914544 A EP 93914544A EP 93914544 A EP93914544 A EP 93914544A EP 0610460 A1 EP0610460 A1 EP 0610460A1
Authority
EP
European Patent Office
Prior art keywords
rail
coolant
cooling
synthetic
carried out
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
EP93914544A
Other languages
German (de)
English (en)
Other versions
EP0610460B1 (fr
Inventor
Alfred Moser
Georg Prskawetz
Peter Pointner
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 Rail Technology GmbH
Original Assignee
Voestalpine Schienen 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 Schienen GmbH filed Critical Voestalpine Schienen GmbH
Publication of EP0610460A1 publication Critical patent/EP0610460A1/fr
Application granted granted Critical
Publication of EP0610460B1 publication Critical patent/EP0610460B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • 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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • 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

Definitions

  • the invention relates to a method for heat-treating rails, in particular the rail head, in which cooling is carried out in a coolant containing a synthetic coolant additive, starting from temperatures above 720 ° C.
  • a method of the type mentioned at the outset can be found, for example, in EP-PS 88 746.
  • synthetic coolant additives in the amount of 20 to 50% by weight, and in particular polyglycols, are used, the synthetic coolant additive primarily ensuring a uniformization of the cooling conditions while maintaining a reduced cooling rate.
  • Synthetic quenching agents are usually used in technology where a minimum cooling rate is required to set a martensitic structure.
  • the aim of such hardening is to harden the maximum cross-section, and in the case of objects which have different cross-sections, it naturally applies that the areas with smaller cross-sections are also completely hardened. In such applications, the workpiece can be left in the bath or hardening bath until the temperature is equalized.
  • the invention now aims to provide a method of the type mentioned at the beginning with which the optimum cooling speeds for the rail head can be maintained and at the same time it prevents the undesired hardening of the much thinner web from occurring.
  • the method according to the invention essentially consists in that the treatment is carried out by immersion in the coolant until a surface temperature of between 450.degree. C. and 550.degree.
  • the fact that the drawing is carried out at a point in time at which the immersed areas have reached a surface temperature between 450 and 550 ° C. without temperature compensation over the entire cross section ensures that the drawing is early enough to form a hardness structure in the jetty with certainty to be excluded.
  • the measure according to the invention being used as a criterion for the timeliness of the pulling, the achievement of a surface temperature between 450 and 550 ° C., here together with the fact the fact that a synthetic coolant additive is used means that the cooling rate in the head is low enough to reliably avoid hardening in the web.
  • the use of a synthetic coolant additive ensures a reduction in the cooling rate, but also a sufficiently high cooling rate, which ensures the formation of a high-strength, fine pearlitic structure in the rail head.
  • the process according to the invention is advantageously carried out in such a way that synthetic additives, such as, for example, glycols or polyglycols, are added to the coolant to an extent which transitions at a bath temperature between 35-55 ° C from film boiling to the boiling phase at a surface temperature of approx. 500 ° C. and the desired time for pulling the rails results from this.
  • synthetic additives preferably glycols and polyglycols
  • the use of synthetic additives, preferably glycols and polyglycols to an extent which ensures that the correct time for pulling the splint is indicated by a boiling of the bath, ensures that consistent and optimal results are guaranteed for both the rail head and the web.
  • the workpiece When reaching or just after reaching the boiling point, the workpiece must be pulled if excessive cooling is to be avoided and the film boiling adjusted in such a way that the head region of the rail is optimal to a depth of approximately 20 to 25 mm If pearlite formation can be achieved, after drawing, the lower lying areas are subsequently converted into pearlite, and conversely, if the workpiece were left in the bath after film boiling, it would form due to the rapid cooling which now begins would come from martensite. After reaching the boiling point, the further cooling outside the bath can be carried out slowly enough to ensure complete pearlite formation, which, as already mentioned, could no longer be ensured after the boiling had been reached due to the much faster cooling in the bath. Such a faster cooling rate in the bathroom would also have the consequence that, above all, the smaller cross-section of the web would be hardened more quickly and it undesirable martensite formation would occur, which naturally increases the risk of breakage.
  • the process is carried out by selecting the appropriate amount of the synthetic coolant in the coolant and the exact determination of the point in time at which the immersed areas must be drawn in order to prevent undesired hardening of other areas.
  • the proportion of synthetic additives in the coolant determines the time of the transition from film boiling to boiling phase, the setting of the constellation having to be such that the boiling phase is only reached in the last cooling phase before drawing in order to ensure uniform cooling.
  • the set concentration must be kept constant over a corresponding control system - which is not necessary with the usual use of the agent according to the known state of the art - in order to ensure that this concentration, which is necessary for the detection of the timely drawing is essential, is not subject to fluctuations. The same applies to the bath temperature.
  • the bath circulation must be kept constant contrary to the known prior art. With regard to the flow velocity of the medium onto the rolling stock or the rail to be cooled, it should be noted that this must be as constant as possible over the entire length of the rolling stock or the rail and over the entire duration of the heat treatment in the present case. Because with the known methods for hardening, where the austenitic structure is fully immersed, it is sufficient to adhere only to a lower limit of this parameter in order to obtain the hardening effect.
  • the method according to the invention relates to an optimum combination for partial diving between the diving temperature and the diving time, the rail having a surface temperature between 450 and 550 ° C. at the end of cooling, with no temperature compensation over the entire cross section.
  • the procedure can be such that the rail foot is cooled with compressed air and / or a water / air mixture.
  • the method according to the invention is advantageously applied to a steel with the directional analysis 0.65-0.85% C, 0.01-1.2% Si, 0.5-3.5% Mn, 0.01-1.0% Cr, rest Fe and usual impurities applied.
  • FIG. 1 shows a section through a splint treated according to the inventive method, the hardness distribution HB being shown for different zones; and
  • FIG. 2 shows a diagram of the hardness distribution as a function of the distance from the center of the running surface in the direction of the rail web.
  • the rail or the rail head are immersed at a temperature of 820 ° C. in a coolant containing a synthetic coolant additive, the depth of the head being approximately 37 mm.
  • a bath temperature of 50 ° C and a selected bath concentration of 35% After a dipping time of 150 s there is a surface or reheating temperature of 505 ° C, this surface temperature being maintained or the immersed areas being drawn into one Time is made without that there was a temperature compensation over the entire rail or head cross-section.
  • the hardness distribution that can be achieved with such a method is shown for a rail profile UIC 60 in FIG. 1, the hardness distribution HB being specified for different areas. It is clear that the rail head has correspondingly higher hardness values than the rail web and the rail foot.
  • the diagram shown in FIG. 2 shows, depending on the distance from the center of the running surface in millimeters, the hardness distribution HB 30 that can be achieved with the method for the heat treatment of rails.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Articles (AREA)
  • Magnetic Heads (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

Selon un procédé de traitement thermique de rails, notamment de champignons de rails, ceux-ci sont refroidis dans un agent de refroidissement contenant un additif synthétique à partir de températures supérieures à 720 °C. Afin d'éviter un durcissement par trempe de l'âme du rail tout en assurant des vitesses optimales de refroidissement du champignon du rail, le traitement par immersion dans l'agent de refroidissement se poursuit jusqu'à obtenir après étirement des zones immergées une température superficielle comprise entre 450 °C et 550 °C sans équilibrage de la température sur toute la section transversale.
EP93914544A 1992-07-15 1993-07-09 Procede de traitement thermique de rails Expired - Lifetime EP0610460B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT0145592A AT399346B (de) 1992-07-15 1992-07-15 Verfahren zum w[rmebehandeln von schienen
AT145592 1992-07-15
AT1455/92 1992-07-15
PCT/AT1993/000116 WO1994002652A1 (fr) 1992-07-15 1993-07-09 Procede de traitement thermique de rails

Publications (2)

Publication Number Publication Date
EP0610460A1 true EP0610460A1 (fr) 1994-08-17
EP0610460B1 EP0610460B1 (fr) 1999-10-20

Family

ID=3514282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93914544A Expired - Lifetime EP0610460B1 (fr) 1992-07-15 1993-07-09 Procede de traitement thermique de rails

Country Status (20)

Country Link
US (2) US6406569B1 (fr)
EP (1) EP0610460B1 (fr)
KR (1) KR0134900B1 (fr)
CN (1) CN1040232C (fr)
AT (2) AT399346B (fr)
BR (1) BR9305583A (fr)
CA (1) CA2116216C (fr)
CZ (1) CZ283571B6 (fr)
DE (1) DE59309839D1 (fr)
ES (1) ES2139661T3 (fr)
HR (1) HRP931054B1 (fr)
LT (1) LT3008B (fr)
LV (1) LV11192B (fr)
MD (1) MD940198A (fr)
PL (1) PL175451B1 (fr)
RU (1) RU94019951A (fr)
SK (1) SK281598B6 (fr)
TW (1) TW259818B (fr)
UA (1) UA26282C2 (fr)
WO (1) WO1994002652A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402941B (de) 1994-07-19 1997-09-25 Voest Alpine Schienen Gmbh Verfahren und vorrichtung zur wärmebehandlung von profiliertem walzgut
IN191289B (fr) 1994-07-19 2003-11-01 Voest Alpine Schienen Gmbh
BR9506522A (pt) 1994-11-15 1997-09-02 Nippon Steel Corp Trilho de aço perlítico que tem excelente resisténcia ao desgaste e método de produção do mesmo
CN1083013C (zh) * 1996-09-29 2002-04-17 攀枝花钢铁(集团)公司 利用轧制余热生产高强度钢轨的热处理方法及其装置
AT407057B (de) * 1996-12-19 2000-12-27 Voest Alpine Schienen Gmbh Profiliertes walzgut und verfahren zu dessen herstellung
AT409268B (de) 2000-05-29 2002-07-25 Voest Alpine Schienen Gmbh & C Verfahren und einrichtung zum härten von schienen
JP5145795B2 (ja) * 2006-07-24 2013-02-20 新日鐵住金株式会社 耐摩耗性および延性に優れたパーライト系レールの製造方法
US8241442B2 (en) * 2009-12-14 2012-08-14 Arcelormittal Investigacion Y Desarrollo, S.L. Method of making a hypereutectoid, head-hardened steel rail
US20110189047A1 (en) * 2010-02-02 2011-08-04 Transportation Technology Center, Inc. Railroad rail steels resistant to rolling contact fatigue
US8813514B2 (en) * 2012-08-06 2014-08-26 Robert Hon-Sing Wong Geothermal rail cooling and heating system
CN103014486A (zh) * 2012-12-08 2013-04-03 内蒙古包钢钢联股份有限公司 一种高强度热处理钢轨专用钢材
PL3249070T3 (pl) 2015-01-23 2020-07-27 Nippon Steel Corporation Szyna

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE582957C (de) 1926-10-22 1933-08-25 Maximilianshuette Eisenwerk Verfahren zum Vergueten von Eisenbahnschienen
BE854834A (fr) * 1977-05-18 1977-09-16 Centre Rech Metallurgique Procede de fabrication de rails a caracteristiques ameliorees
JPS5818966B2 (ja) * 1978-06-23 1983-04-15 日本鋼管株式会社 レ−ルの製造方法
BE884443A (fr) 1980-07-23 1981-01-23 Centre Rech Metallurgique Perfectionnements aux procedes de fabrication de rails a haute resistance
AT375402B (de) * 1982-03-09 1984-08-10 Voest Alpine Ag Verfahren zum waermebehandeln von schienen
JPH0745693B2 (ja) * 1988-05-18 1995-05-17 日本鋼管株式会社 レールの冷却方法
US4895605A (en) * 1988-08-19 1990-01-23 Algoma Steel Corporation Method for the manufacture of hardened railroad rails

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9402652A1 *

Also Published As

Publication number Publication date
LV11192A (lv) 1996-04-20
US6406569B1 (en) 2002-06-18
EP0610460B1 (fr) 1999-10-20
PL302766A1 (en) 1994-08-22
US20010023724A1 (en) 2001-09-27
SK281598B6 (sk) 2001-05-10
HRP931054B1 (en) 2000-02-29
TW259818B (fr) 1995-10-11
SK29494A3 (en) 1994-11-09
ATA145592A (de) 1994-09-15
WO1994002652A1 (fr) 1994-02-03
DE59309839D1 (de) 1999-11-25
ES2139661T3 (es) 2000-02-16
HRP931054A2 (en) 1995-06-30
PL175451B1 (pl) 1998-12-31
ATE185845T1 (de) 1999-11-15
CN1040232C (zh) 1998-10-14
KR0134900B1 (en) 1998-06-15
CZ283571B6 (cs) 1998-05-13
AT399346B (de) 1995-04-25
CZ56394A3 (en) 1994-06-15
BR9305583A (pt) 1996-01-02
LV11192B (en) 1996-06-20
RU94019951A (ru) 1996-04-10
CN1085258A (zh) 1994-04-13
US6547897B2 (en) 2003-04-15
CA2116216A1 (fr) 1994-02-03
CA2116216C (fr) 2001-09-18
LT3008B (lt) 1994-08-25
UA26282C2 (uk) 1999-07-19
LTIP797A (lt) 1994-03-25
MD940198A (ro) 1996-01-31

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