EP0610460B1 - Procede de traitement thermique de rails - Google Patents
Procede de traitement thermique de rails Download PDFInfo
- 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
Links
Images
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)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Magnetic Heads (AREA)
- Furnace Charging Or Discharging (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Control Of Heat Treatment Processes (AREA)
Claims (3)
- Procédé de traitement thermique de rails, en particulier du champignon de rail, dans lequel ledit rail ou champignon de rail est refroidi à partir de températures supérieures à 720°C par trempe dans un fluide de trempe dans lequel des additifs synthétiques, tels que des glycols ou des polyglycols, ont été ajoutés dans des proportions telles que l'on obtient, avec une température de bain comprise entre 35°C et 55°C, le passage de l'ébullition pelliculaire à la phase d'ébullition avec une température superficielle comprise entre 450°C et 550°C, stade souhaité pour le retrait des rails, et dans lequel le refroidissement après obtention du point d'ébullition est interrompu par retrait du rail hors dudit bain et poursuivi lentement à l'extérieur du bain de trempe, les rails présentant, à la fin du refroidissement après retrait des régions immergées, une température superficielle comprise entre 450°C et 550°C sans équilibrage des températures sur la totalité de la section.
- Procédé selon la revendication 1, caractérisé en ce que le patin du rail est refroidi à l'air comprimé et/ou au moyen d'un mélange air/eau.
- Procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce que le traitement thermique est appliqué à un acier présentant la composition indicative suivante : 0,65-0,85% C, 0,01-1,2% Si, 0,5-3,5% Mn, 0,01-1,0% Cr, et pour le reste du fer et des impuretés classiques.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT145592 | 1992-07-15 | ||
AT1455/92 | 1992-07-15 | ||
AT0145592A AT399346B (de) | 1992-07-15 | 1992-07-15 | Verfahren zum w[rmebehandeln von schienen |
PCT/AT1993/000116 WO1994002652A1 (fr) | 1992-07-15 | 1993-07-09 | Procede de traitement thermique de rails |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0610460A1 EP0610460A1 (fr) | 1994-08-17 |
EP0610460B1 true 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)
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 | |
USRE42668E1 (en) | 1994-11-15 | 2011-09-06 | Nippon Steel Corporation | Pearlitic steel rail having excellent wear resistance and method of producing the same |
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 |
EP3249070B1 (fr) | 2015-01-23 | 2020-03-18 | Nippon Steel Corporation | Rail |
Family Cites Families (7)
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 |
-
1992
- 1992-07-15 AT AT0145592A patent/AT399346B/de not_active IP Right Cessation
-
1993
- 1993-07-09 AT AT93914544T patent/ATE185845T1/de not_active IP Right Cessation
- 1993-07-09 SK SK294-94A patent/SK281598B6/sk not_active IP Right Cessation
- 1993-07-09 RU RU94019951/02A patent/RU94019951A/ru unknown
- 1993-07-09 PL PL93302766A patent/PL175451B1/pl unknown
- 1993-07-09 BR BR9305583A patent/BR9305583A/pt not_active IP Right Cessation
- 1993-07-09 DE DE59309839T patent/DE59309839D1/de not_active Expired - Lifetime
- 1993-07-09 WO PCT/AT1993/000116 patent/WO1994002652A1/fr active IP Right Grant
- 1993-07-09 ES ES93914544T patent/ES2139661T3/es not_active Expired - Lifetime
- 1993-07-09 CZ CZ94563A patent/CZ283571B6/cs not_active IP Right Cessation
- 1993-07-09 US US08/533,944 patent/US6406569B1/en not_active Expired - Lifetime
- 1993-07-09 EP EP93914544A patent/EP0610460B1/fr not_active Expired - Lifetime
- 1993-07-09 UA UA94005532A patent/UA26282C2/uk unknown
- 1993-07-09 CA CA002116216A patent/CA2116216C/fr not_active Expired - Lifetime
- 1993-07-14 CN CN93109864A patent/CN1040232C/zh not_active Expired - Lifetime
- 1993-07-15 LT LTIP797A patent/LT3008B/lt not_active IP Right Cessation
- 1993-07-15 LV LVP-93-992A patent/LV11192B/lv unknown
- 1993-07-15 TW TW082105625A patent/TW259818B/zh active
- 1993-07-15 HR HRA1455/92A patent/HRP931054B1/xx not_active IP Right Cessation
-
1994
- 1994-03-14 KR KR94700834A patent/KR0134900B1/ko not_active IP Right Cessation
- 1994-07-14 MD MD94-0198A patent/MD940198A/ro unknown
-
2001
- 2001-05-25 US US09/864,288 patent/US6547897B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
SK29494A3 (en) | 1994-11-09 |
PL302766A1 (en) | 1994-08-22 |
UA26282C2 (uk) | 1999-07-19 |
LV11192B (en) | 1996-06-20 |
CA2116216A1 (fr) | 1994-02-03 |
HRP931054A2 (en) | 1995-06-30 |
ATE185845T1 (de) | 1999-11-15 |
CZ283571B6 (cs) | 1998-05-13 |
TW259818B (fr) | 1995-10-11 |
LT3008B (lt) | 1994-08-25 |
LV11192A (lv) | 1996-04-20 |
CN1040232C (zh) | 1998-10-14 |
EP0610460A1 (fr) | 1994-08-17 |
CN1085258A (zh) | 1994-04-13 |
LTIP797A (lt) | 1994-03-25 |
HRP931054B1 (en) | 2000-02-29 |
WO1994002652A1 (fr) | 1994-02-03 |
US20010023724A1 (en) | 2001-09-27 |
ATA145592A (de) | 1994-09-15 |
CZ56394A3 (en) | 1994-06-15 |
DE59309839D1 (de) | 1999-11-25 |
US6406569B1 (en) | 2002-06-18 |
AT399346B (de) | 1995-04-25 |
PL175451B1 (pl) | 1998-12-31 |
MD940198A (ro) | 1996-01-31 |
ES2139661T3 (es) | 2000-02-16 |
US6547897B2 (en) | 2003-04-15 |
KR0134900B1 (en) | 1998-06-15 |
RU94019951A (ru) | 1996-04-10 |
SK281598B6 (sk) | 2001-05-10 |
BR9305583A (pt) | 1996-01-02 |
CA2116216C (fr) | 2001-09-18 |
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