EP0088746A1 - Procédé de traitement thermique de rails - Google Patents

Procédé de traitement thermique de rails Download PDF

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Publication number
EP0088746A1
EP0088746A1 EP83890026A EP83890026A EP0088746A1 EP 0088746 A1 EP0088746 A1 EP 0088746A1 EP 83890026 A EP83890026 A EP 83890026A EP 83890026 A EP83890026 A EP 83890026A EP 0088746 A1 EP0088746 A1 EP 0088746A1
Authority
EP
European Patent Office
Prior art keywords
rail
coolant
temperature
content
coolant additive
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
EP83890026A
Other languages
German (de)
English (en)
Other versions
EP0088746B1 (fr
Inventor
Alfred Dr. Dipl.-Ing. Moser
Peter Dipl.-Ing. Pointner
Georg Dipl.-Ing. Prskawetz
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 Stahl Donawitz GmbH
Original Assignee
Voestalpine AG
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
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Application filed by Voestalpine AG filed Critical Voestalpine AG
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    • 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

Definitions

  • the invention relates to a method for the heat treatment of rails made of a steel containing C, Si and Mn as well as alloy elements by quenching the rail or at least the rail head by means of a cooling medium from a temperature lying in the austenite region to a temperature at which the pearlite transformation is complete, to achieve a fine pearlitic structure.
  • the formation of the structure largely depends on the cooling conditions.
  • the formation of martensite must be prevented in any case, since this causes the rail to become brittle. It has been found that optimal wear properties can be achieved with such rails if the cooling is carried out in such a way that a fine pearlitic structure is produced.
  • the object of the invention is now to even out the fine pearlitic microstructure and thus to improve the wear properties of the rail or the rail head.
  • the invention consists essentially in the fact that rails made of steel, the 0.65 to 0.85% C, max. 0.80% Si and 0.5 to 2.5% Mn, balance iron and unavoidable impurities, are treated in a cooling medium, the water with a known synthetic coolant additive, preferably polyglycol, in an amount of 20 to 60%, based on the total cooling medium, contains.
  • This synthetic coolant additive forms a layer on the rail or the rail head, which reduces the cooling rate.
  • Such a layer is uniform and is not adversely affected by scaling jumping off, so that uniform cooling conditions can be achieved in this way over the entire surface and over the entire length of the rail or the rail head.
  • the synthetic coolant additive preferably polyglycol
  • the synthetic coolant additive is used according to the invention in an amount of 20-60%, based on the total cooling medium.
  • rail steels with 0.65% - 0.85% C, max. 0.80% Si and 0.5 - 2.5% Mn, balance iron and unavoidable impurities a uniform result in terms of wear resistance can be achieved.
  • Polyglycol has proven itself particularly well in this regard.
  • the cooling medium can also be sprayed onto the rail or the rail head. But the rail or at least the rail is useful Rail head immersed in the cooling medium in a manner known per se, since in this way the film of the synthetic coolant additive can be formed better and more uniformly.
  • the heat treatment can take place in a manner known per se from the rolling heat, so that the rolling heat is utilized and subsequent heating, which is costly, is avoided.
  • the cooling medium is preferably composed such that there is a cooling rate of 0.2-6 C / sec in the temperature range between 800 and 500 ° C. sets.
  • the cooling rates which are required to achieve a fine pearlitic structure are known for the various compositions of the rail and are in the range 0.2-6 ° C./sec.
  • a thicker film of the coolant additive forms on the rail or the rail head and the cooling rate becomes lower than with a lower synthetic coolant additive.
  • Within the range of 0.2 - 6 ° C / sec. can be selected by choosing the amount of the coolant additive taking into account the composition of the rail steel within the above-mentioned limits of 0.65 - 0.85% C, max. 0.80% Si and 0.5-2.5% Mn the cooling rate can be varied.
  • Fig. 1 shows a diagram and Fig. 2 shows a cross section through a rail head
  • Fi g . 3 shows a diagram of the wear resistance as a function of the Vickers hardness
  • FIG. 4 shows the dependence of the improvement of the wear resistance on the manganese and carbon content for a given proportion of the coolant additive.
  • samples are determined at different distances from the surface b of the rail head along the so-called hardness track indicated by the arrow a on the cut surface.
  • Fig. 1 the Vickers hardness HV 30 is plotted on the ordinate.
  • the distances of the measurements from the surface or the running surface b of a rail head are plotted on the abscissa.
  • Curve c shows a measurement in rails treated by the method according to the invention which have a fine pearlitic structure.
  • Curve d shows the hardness curve along the hardness track a with a rail of similar composition, the head of which was quenched in hot water.
  • FIG. 3 shows a diagram in which the wear resistance ⁇ , expressed in N / cm 2 , is plotted on the ordinate.
  • the Vickers hardness HV 30 measured in the edge of the rail head, is shown on the abscissa.
  • Curve e shows the course of wear resistance in comparison to Vickers hardness.
  • the area e 1 is the area in which the wear resistance and the Vickers hardness are in the case of rails heat-treated by the method according to the invention.
  • the known values which can be achieved by known methods, are considerably below the range e 1 .
  • the areas e2, e3 and e 4 show the strength values achieved so far for different rail steel qualities, e3 and e 4 for different standard rail steel grades and e2 for a Cr-Mn rail steel.
  • the manganese content in% by weight is plotted on the ordinate, starting at 1.1% by weight.
  • the carbon content in% by weight begins on the abscissa applied with 0.65% by weight.
  • the e-g a transmitted square in this graph f limits the range of steels with a carbon content of 0.7 - 0.75 wt% and a manganese g e-stop of 1.2 -. 1.3 wt.%.
  • a proportion of 30% by volume of a polyglycol as coolant additive gives the best results.
  • A corresponds to 30% by volume of a polyglycol in the coolant.
  • the proportion of the coolant additive With increasing carbon content, the proportion of the coolant additive must be reduced to achieve the same results if the manganese content remains the same. Conversely, with the carbon content remaining constant and the manganese content increasing, the proportion of the coolant additive must be increased in order to again achieve the same results, the straight lines h and i representing the lower and the upper limit for the proportion of the coolant additive, namely 20% by volume and 50% by volume .%, reproduces. If the coolant additive in the steels mentioned falls below the lower limit of 20% by volume, the cooling rate would be too high, causing the tendency to warp in the rail head to increase to a great extent. Conversely, exceeding the upper limit of 50 vol.% Coolant additive for the steels in the specified range would result in increased deposit formation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
EP19830890026 1982-03-09 1983-02-22 Procédé de traitement thermique de rails Expired EP0088746B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0093182A AT375402B (de) 1982-03-09 1982-03-09 Verfahren zum waermebehandeln von schienen
AT931/82 1982-03-09

Publications (2)

Publication Number Publication Date
EP0088746A1 true EP0088746A1 (fr) 1983-09-14
EP0088746B1 EP0088746B1 (fr) 1987-04-15

Family

ID=3503141

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830890026 Expired EP0088746B1 (fr) 1982-03-09 1983-02-22 Procédé de traitement thermique de rails

Country Status (5)

Country Link
EP (1) EP0088746B1 (fr)
JP (1) JPS58221229A (fr)
AT (1) AT375402B (fr)
CA (1) CA1205729A (fr)
DE (1) DE3370972D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002652A1 (fr) * 1992-07-15 1994-02-03 Voest-Alpine Schienen Gmbh Procede de traitement thermique de rails
WO1997045562A1 (fr) * 1996-05-24 1997-12-04 Bwg Butzbacher Weichenbau Gmbh Procede de production d'une superstructure de voie ferree et superstructure de voie ferree
CZ299001B6 (cs) * 2000-05-29 2008-04-02 Voestalpine Schienen Gmbh Zpusob a zarízení na kalení kolejnic nebo hlavy kolejnic

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62161917A (ja) * 1986-01-09 1987-07-17 Nippon Steel Corp 耐摩耗性、耐損傷性にすぐれた端頭部熱処理レ−ルの製造法
JPS63203724A (ja) * 1987-02-19 1988-08-23 Nkk Corp レ−ルの焼入方法
DE4003363C1 (en) * 1990-02-05 1991-03-28 Voest-Alpine Industrieanlagenbau Ges.M.B.H., Linz, At Hardening rails from rolling temp. - using appts. with manipulator engaging rail from exit roller table with support arms positioned pivotably on each side
AT401359B (de) * 1991-04-05 1996-08-26 Vae Ag Verfahren zur herstellung eines herzstückes
EP0685566B2 (fr) * 1993-12-20 2013-06-05 Nippon Steel & Sumitomo Metal Corporation Rail a elevee resistance a l'abrasion et a haute tenacite, possedant une structure metallographique perlitique, et procede de production dudit rail

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1242660B (de) * 1963-06-29 1967-06-22 Union Carbide Corp Abschreckmedium zum Abschrecken von waermebehandeltem Metall
DE1802273A1 (de) * 1968-01-18 1969-08-07 Zentralinstitut Fuer Fertigung Mittel zum Abschrecken von austenitisiertem Stahl oder anderen Eisenwerkstoffen zum Zweck des Haertens oder Verguetens
DE2439338B1 (de) * 1974-08-16 1975-10-23 Fried. Krupp, Huettenwerke Ag, 4630 Bochum Verfahren zur Wärmebehandlung von Schienen
DE2630176A1 (de) * 1975-07-03 1977-03-17 Houghton & Co E F Verfahren zum abschrecken zur hitzebehandlung von metallen
DE2820784A1 (de) * 1977-05-18 1978-11-23 Centre Rech Metallurgique Verfahren zur herstellung von schienen mit verbesserten eigenschaftswerten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1242660B (de) * 1963-06-29 1967-06-22 Union Carbide Corp Abschreckmedium zum Abschrecken von waermebehandeltem Metall
DE1802273A1 (de) * 1968-01-18 1969-08-07 Zentralinstitut Fuer Fertigung Mittel zum Abschrecken von austenitisiertem Stahl oder anderen Eisenwerkstoffen zum Zweck des Haertens oder Verguetens
DE2439338B1 (de) * 1974-08-16 1975-10-23 Fried. Krupp, Huettenwerke Ag, 4630 Bochum Verfahren zur Wärmebehandlung von Schienen
DE2630176A1 (de) * 1975-07-03 1977-03-17 Houghton & Co E F Verfahren zum abschrecken zur hitzebehandlung von metallen
DE2820784A1 (de) * 1977-05-18 1978-11-23 Centre Rech Metallurgique Verfahren zur herstellung von schienen mit verbesserten eigenschaftswerten

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002652A1 (fr) * 1992-07-15 1994-02-03 Voest-Alpine Schienen Gmbh Procede de traitement thermique de rails
US6406569B1 (en) 1992-07-15 2002-06-18 Voest-Alpine Schienen Gmbh Procedure for the thermal treatment of rails
US6547897B2 (en) 1992-07-15 2003-04-15 Voest-Alpine Schienen Gmbh Procedure for the thermal treatment of rails
WO1997045562A1 (fr) * 1996-05-24 1997-12-04 Bwg Butzbacher Weichenbau Gmbh Procede de production d'une superstructure de voie ferree et superstructure de voie ferree
CZ299001B6 (cs) * 2000-05-29 2008-04-02 Voestalpine Schienen Gmbh Zpusob a zarízení na kalení kolejnic nebo hlavy kolejnic

Also Published As

Publication number Publication date
JPS58221229A (ja) 1983-12-22
CA1205729A (fr) 1986-06-10
DE3370972D1 (en) 1987-05-21
EP0088746B1 (fr) 1987-04-15
AT375402B (de) 1984-08-10
ATA93182A (de) 1983-12-15

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Inventor name: PRSKAWETZ, GEORG, DIPL.-ING.

Inventor name: POINTNER, PETER, DIPL.-ING.

Inventor name: MOSER, ALFRED, DR., DIPL.-ING.