EP0610460B1 - Verfahren zum wärmebehandeln von schienen - Google Patents

Verfahren zum wärmebehandeln von schienen Download PDF

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Publication number
EP0610460B1
EP0610460B1 EP93914544A EP93914544A EP0610460B1 EP 0610460 B1 EP0610460 B1 EP 0610460B1 EP 93914544 A EP93914544 A EP 93914544A EP 93914544 A EP93914544 A EP 93914544A EP 0610460 B1 EP0610460 B1 EP 0610460B1
Authority
EP
European Patent Office
Prior art keywords
rail
cooling
coolant
temperature
bath
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
EP93914544A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0610460A1 (de
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/de
Application granted granted Critical
Publication of EP0610460B1 publication Critical patent/EP0610460B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 treatment of rails, especially the rail head, at which in a containing a synthetic coolant additive Coolant based on temperatures above 720 ° C is cooled.
  • a method of the type mentioned at the outset is, for example can be found in EP-PS 88 746.
  • synthetic coolant additives in the amount of 20 to 50 wt .-%, and in particular polyglycols, used the synthetic coolant additive primarily an equalization the cooling conditions if a reduced cooling rate guaranteed.
  • Synthetic Quenchers are commonly used in the art applied where compliance with a minimum cooling rate for setting a martensitic structure is required. The aim of such hardening is to maximum cross-section hardening, and for objects, which have different cross sections naturally applies that even the areas with smaller cross sections are complete be fully hardened. In such applications the workpiece up to temperature compensation in the bath or hardening bath be left.
  • the invention now aims to provide a method of the type mentioned create with which the optimal cooling speeds for the Rail head can be adhered to and at the same time it is prevented that a unwanted hardening of the much thinner web takes place.
  • This is the object of the method according to the invention in that the rail head in a coolant, which synthetic additives, such as. Glycols or polyglycols, are added to an extent which at a bath temperature between 35 ° C - 55 ° C the transition from film boiling to Cooking phase at a surface temperature between 450 ° C to 550 ° C.
  • the measure according to the invention as a criterion for the timeliness of the drawing, the To achieve a surface temperature between 450 and 550 ° C, here together with the fact that a synthetic coolant additive is used causes the cooling rate in the head to be slow enough to Avoid hardening in the dock with certainty.
  • a synthetic coolant additive does reduce the Cooling rate, but also a sufficiently high cooling rate ensures that the formation of a high-strength, fine pearlitic structure in the Rail head guaranteed.
  • the bath circulation must be contrary to the known prior art be kept constant.
  • Regarding the flow velocity of the medium on the rolling stock or the rail to be cooled to note that this in the case in question on the entire length of the rolling stock or the rail and over the total duration of the heat treatment must be as constant as possible.
  • the method according to the invention on the other hand, one that is optimal for partial diving Combination between diving temperature and diving time, whereby the Track a surface temperature at the end of cooling between 450 to 550 ° C, with no temperature compensation comes across the entire cross section.
  • the method according to the invention is advantageous on 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, balance Fe and usual Impurities applied.
  • FIG. 1 shows a section through a section according to FIG the rail treated according to the invention, the Hardness distribution HB is shown for different zones; and
  • FIG. 2 shows a diagram of the hardness distribution as a function of Distance from the center of the runway towards the rail web.
  • the rail or the Rail head are in with a temperature of 820 ° C a coolant containing a synthetic coolant additive submerged, the depth of the head being about 37 mm.
  • a surface or heat return temperature of 505 ° C At a bath temperature of 50 ° C and a selected bath concentration 35% after a diving time of 150 s a surface or heat return temperature of 505 ° C, where maintain this surface temperature or pull the immersed Areas is made at a time without that temperature compensation over the entire rail or Head cross section was made.
  • the hard distribution that can be achieved with such a method is shown for a rail profile UIC 60 in Fig.1, wherein the hardness distribution HB is given for different areas is. It clearly shows that the rail head corresponds accordingly higher hardness values than the rail web and the rail foot having.

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)
EP93914544A 1992-07-15 1993-07-09 Verfahren zum wärmebehandeln von schienen Expired - Lifetime EP0610460B1 (de)

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
AT1455/92 1992-07-15
AT145592 1992-07-15
PCT/AT1993/000116 WO1994002652A1 (de) 1992-07-15 1993-07-09 Verfahren zum wärmebehandeln von schienen

Publications (2)

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

Family

ID=3514282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93914544A Expired - Lifetime EP0610460B1 (de) 1992-07-15 1993-07-09 Verfahren zum wärmebehandeln von schienen

Country Status (20)

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

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 (ro) 1994-07-19 2003-11-01 Voest Alpine Schienen Gmbh
DE69523149T2 (de) 1994-11-15 2002-06-20 Nippon Steel Corp Perlitschiene mit hoher abriebfestigkeit und verfahren zu deren herstellung
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

Also Published As

Publication number Publication date
CZ283571B6 (cs) 1998-05-13
CN1085258A (zh) 1994-04-13
US6547897B2 (en) 2003-04-15
HRP931054B1 (en) 2000-02-29
HRP931054A2 (en) 1995-06-30
LV11192B (en) 1996-06-20
MD940198A (ro) 1996-01-31
BR9305583A (pt) 1996-01-02
SK29494A3 (en) 1994-11-09
PL175451B1 (pl) 1998-12-31
ATE185845T1 (de) 1999-11-15
CA2116216C (en) 2001-09-18
EP0610460A1 (de) 1994-08-17
US20010023724A1 (en) 2001-09-27
ATA145592A (de) 1994-09-15
CA2116216A1 (en) 1994-02-03
TW259818B (ro) 1995-10-11
US6406569B1 (en) 2002-06-18
ES2139661T3 (es) 2000-02-16
DE59309839D1 (de) 1999-11-25
RU94019951A (ru) 1996-04-10
LT3008B (lt) 1994-08-25
LV11192A (lv) 1996-04-20
WO1994002652A1 (de) 1994-02-03
UA26282C2 (uk) 1999-07-19
CN1040232C (zh) 1998-10-14
LTIP797A (lt) 1994-03-25
AT399346B (de) 1995-04-25
SK281598B6 (sk) 2001-05-10
CZ56394A3 (en) 1994-06-15
PL302766A1 (en) 1994-08-22
KR0134900B1 (en) 1998-06-15

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