US20040187974A1 - Method for cooling work pieces especially shape-rolled products from rail steel - Google Patents
Method for cooling work pieces especially shape-rolled products from rail steel Download PDFInfo
- Publication number
- US20040187974A1 US20040187974A1 US10/485,286 US48528604A US2004187974A1 US 20040187974 A1 US20040187974 A1 US 20040187974A1 US 48528604 A US48528604 A US 48528604A US 2004187974 A1 US2004187974 A1 US 2004187974A1
- Authority
- US
- United States
- Prior art keywords
- cooling
- temperature
- workpiece
- parameters
- perlitic
- 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.)
- Abandoned
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 239000002826 coolant Substances 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910001563 bainite Inorganic materials 0.000 description 6
- 230000035882 stress Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000010451 perlite Substances 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- -1 friction wear Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
Definitions
- the invention relates to a method of cooling workpieces, especially for the cooling of rolled products and here to a method of cooling shape-rolled products [rolled structural shapes] of rail steels with a fine perlitic or a ferritic/perlitic structure, whereby the hot workpiece, that is a workpiece with an authentic structure, is passed through a cooling stretch with an inlet region and an outlet region and is subjected to a cooling process and as a result a transformation is carried out into a perlitic or ferritic/perlitic structure.
- Rail steels are significant for the production of rails as well as of their connection elements and their fastening elements.
- the vertical and lateral forces which are applied by the wheel to the rail like normal forces, traveling forces, acceleration forces and braking forces, give rise in the regions in which they are directly effective to extremely high dynamic stresses and, as a rule, to a plastic deformation of the steel.
- wear effects arise in the form of ablation of material, friction wear, material breakage, local workpiece fatigue or cracking.
- An improvement in the resistance of a rail to these wear effects can be achieved by increasing its elastic limit and tensile strength as well as its fatigue limit in combination with the provision of the finest possible striated perlitic structure.
- rail steels Under normal cooling conditions using a cooling bed in accordance with the state of the art, rail steels undergo a transformation to a perlitic structure. In this manner rail steels with a ferritic/perlitic structure can reach tensile strength values in a range of 700 to 900 N/mm 2 while steels with a purely perlitic structure can achieve tensile strength values in excess of 900 N/mm 2 .
- the significant properties of the rail steels are determined by the proportion of the structure constituted by ferrite/perlite as well as by its morphological structure. Both in the case of ferritic/perlitic steels and in the case of perlitic steels, the lamellae spacing plays a role.
- the invention sets out as its object to provide a cooling process for the production of workpieces, especially shape rolled products from rail steel with improved properties and a fine striated perlite or ferrite/perlite structure.
- the workpiece which is at its (rolling) heat, for example a rolled or optionally an extruded structural-shape product, is passed through a cooling stretch which is assembled from individual/independent cooling modules with independently adjustable cooling parameters, whereby between the cooling modules there are intermediate zones for thermal equalization or thermal stress relief with means for an actual temperature determination for the respective workpiece in this intermediate zone and whereby, in dependence upon the respective actual temperature value in the intermediate zone or in one of the intermediate zones, the specific cooling parameters, especially the cooling intensity, of the respective subsequent cooling module, are controlled in order to maintain a defined (surface) temperature during the entire passage along the cooling stretch, whereby the defined temperatures of the workpieces respectively each lie above a critical temperature at which the bainitic portions of the structure are formed.
- the basic concept is, therefore, the control of the cooling of a workpiece of rail steel in a cooling stretch under the condition that the surface temperature of the workpiece of rail steel is so cooled that the desired perlitic or ferritic or perlitic/ferlitic structure is established, whereby in the stress relief phases there is both a continuous monitoring of the temperature characteristics in preferably each intermediate zone and optionally regulation of the cooling parameters of the individual cooling modules to ensure that the temperature does not fall below a critical temperature so that the under cooling cannot result in a bainitic transformation which can give rise to undesirable bainitic components in the structure.
- the cooling process is carried out by the workpiece traversing cooling modules in individual cooling process steps and in dependence upon the conditions in the intermediate zones for stress relief of the structure in timed phases which can include reheating and/or timed phases in which thermal conditions are maintained and/or timed phases provide a slower cooling, taken together.
- the workpiece in all intermediate zones can be subjected to the same stress relief phase or can be subjected to different timed phases of stress relief in the various intermediate zones.
- the reheating can be effected either from residual heat from the interior of the workpiece and still present therein and/or from the supply of heat to the workpiece from the exterior.
- the intermediate zones are utilized for a thermal equalization over the workpiece, especially rolled products, or for the cooling thereof at slow cooling speeds.
- the respective measured actual temperature value in each of the intermediate zones is utilized to control the specific cooling parameters of the respective subsequent cooling zone and simultaneously the cooling parameters of the respective preceding cooling modules.
- the workpiece or rolled product to the extent that it deviates from a predetermined setpoint temperature at a certain point in time or in a particular intermediate zone, is brought back to the setpoint temperature by a specific change in the cooling parameters of the subsequent cooling module and at the same time the preceding cooling module is adjusted for the next workpiece to follow in the sequence.
- the surface temperature of the workpiece at the end of the intermediate zone i.e. following the end of the region in which structure destressing occurs, is measured.
- the temperature measurement in the intermediate zone can also be used for quality monitoring.
- the surface temperature measurement is effected by an optical and contactless measuring device, that is by means of a pyrometer.
- the control of the cooling parameters and here especially the cooling intensity is effected preferably by means of control of the pressure with which the cooling medium is directed onto the surface of the workpiece and/or by means of regulation or regulated adjustment of the temperature of the cooling medium and/or by means of controlled adjustment of the volume rate of flow of the cooling medium by selection of the cooling nozzle geometry.
- the cooling medium preferably cooling water is used.
- the pressure control is effected preferably by means of a pressure control valve in the inlet to the nozzles and which may be arranged on the cooling beams.
- the cooling intensity is also controllable by utilizing different numbers of nozzles per cooling beam or cooling beam arrangements.
- the cooling medium that is especially cooling water, before its impingement upon the workpiece surface, is preheated at least to the extent that undershooting of the Leidenfrost temperature does not occur or is very greatly delayed.
- the Leidenfrost phenomenon is a nonwetting property of a liquid when the temperature of the contacted body lies above the boiling temperature of the liquid.
- Water for example, is protected by a gas skin of vaporized water from further evaporation and thus loses for a certain time its cooling effectiveness.
- the Leidenfrost temperature increases with increasing cooling water temperature at the inlet and the cooling effect is weakened. So that an undershoot of the Leidenfrost temperature will not occur or will be delayed significantly, it is proposed to preheat the cooling water. This offers the possibility of weakening the cooling and making it more reproducible.
- the temperature of the workpiece before or upon entry into the cooling stretch is measured and based upon this temperature measurement the cooling parameters of the cooling line are preset especially in terms of the adjustment of the pressure with which the cooling medium is directed upon the workpiece surface.
- FIG. 1 is a schematic overview of a coding stretch in which the method of the invention is carried out
- FIG. 2 is a temperature-time diagram with the cooling curves of five measurement points in or on the railhead of a usual rail steel with about 0.8% C and 1.0% Mn which is subjected according to the invention to such a cooling pattern in a cooling stretch according to the invention in which the bainitic temperature is not undershot;
- FIG. 3 for comparison is a temperature-time diagram of the five cooling curves of an unregulated course of cooling wherein the bainite temperature is undershot.
- the cooling stretch 1 illustrated in FIG. 1 is connected to a structural shape rolling line (not illustrated), for example, a rolling line for rail structural shapes of rail steels.
- the cooling stretch 1 is comprised, in the illustrated embodiment, of five cool modules 2 a - e, but is not however limited to this number of cooling modules.
- the individual cooling modules 2 a - 2 e are for example so constructed that they encompass one or more cooling beams or cooling nozzle arrangements.
- the pressure with which the cooling water emerges from the individual nozzles is adjustable by means of the respective pressure control valves 2 a - e.
- the actual pressure is measured by means of the pressure measuring devices 4 a - e. Between the individual cooling modules 2 a - e, intermediate zones 5 a - e are arranged.
- a pyrometer 6 a - e is located for the contactless optical measurement of the surface temperature of the rolled product found in this intermediate zone, whereby in the case of a rail structure shape, the surface temperature at the rail head is measured.
- an additional pyrometer 6 f is disposed upstream of the first cooling module 2 a at the inlet region or beginning 12 of the cooling stretch 1 .
- the individual pyrometers 6 a - f are connected by means of signal connectors 7 a - g with a computer unit 8 .
- the computer unit 8 is connected by corresponding control conductors 9 a - e to the individual control valves 2 a - e for the cooling nozzles to vary the settings of these control values.
- the cooling medium, especially cooling water (cw) is supplied by a common feed pipe 10 with branches 10 a - e connected to the individual cooling modules 2 a - e.
- the first cooling module 2 a After the workpiece has traversed the first cooling module 2 a it enters the first intermediate zone 5 a in which a relief or destressing phase for the structure is effected.
- a second pyrometer 6 a for example a two color pyrometer, a further surface temperature measurement (T ACT )
- T ACT a further surface temperature measurement
- This actual value is transferred to the computer unit 8 over the signal lines 7 a and 7 g and then a difference calculation is carried out between a setpoint value T SET and the actual value (T ACT ).
- the setpoint value always lies immediately above a workpiece-specific temperature at which bainite formation can arise.
- the setpoint values are alloy—specific and can be obtained by experiments.
- a determining factor for this critical temperature below which the rail steel should not be cooled, is about 450 to 500° C.
- the subsequent or a plurality of subsequent cooling modules have their cooling parameters adjusted, here by varying the pressure control valves 2 a - 3 e which regulate the pressure of the cool water directly onto the workpieces.
- the regulation of the pressure values in dependence upon a measure of the actual pressure value is carried out continuously.
- each subsequent cooling module adjusted but also the preceding cooling module is adjusted for each measured value which then affects the subsequent rolled workpiece to be cooled.
- FIGS. 2 and 3 show with the aid of temperature-time diagrams the cooling curves for the rail heads of a material with 0.8% carbon with control and without control.
- the designation C80W60 or C80W65 makes clear that the cooling speed in the core of the rail head (for example a rail shape in accordance with AREA 136 [Standard of American Railway Engineering Association] is significantly higher than in the boundary and that in the core transformation of austenite to perlite or ferrite-perlite occurs at elevated temperatures.
- the simulated cool stretch had five modules which were individually controllable.
- the individual cooling curves are illustrated in FIG. 2 and in no case was the critical temperature at which bainite formation could set in, undershot.
- the sawtooth cooling pattern is clearly shown and involved reheating in the intermediate or equalization zones.
- FIG. 3 shows by comparison a cooling stretch with five cooling modules which are not individually controllable so that the bainite temperature can be undershot in the regions close to the surface (curves 4 and 5 ) of the rail head.
- a cooling of rail steels from the rolling heat can be carried out to yield a fine perlitic or ferlitic/perlitic structure without the mechanical properties and especially the wear properties being negatively affected by bainitic components.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Control Of Heat Treatment Processes (AREA)
- Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/880,635 US7854883B2 (en) | 2001-08-01 | 2007-07-23 | System for cooling shape-rolled rails |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10137596A DE10137596A1 (de) | 2001-08-01 | 2001-08-01 | Verfahren zur Kühlung von Werkstücken, insbesondere von Profilwalzprodukten, aus Schienenstählen |
DE10137596.4 | 2001-08-01 | ||
PCT/EP2002/008271 WO2003012151A1 (de) | 2001-08-01 | 2002-07-25 | Verfahren zur kühlung von werkstücken insbesondere von profilwalzprodukten aus schienenstählen |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/880,635 Division US7854883B2 (en) | 2001-08-01 | 2007-07-23 | System for cooling shape-rolled rails |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040187974A1 true US20040187974A1 (en) | 2004-09-30 |
Family
ID=7693931
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/485,286 Abandoned US20040187974A1 (en) | 2001-08-01 | 2002-07-25 | Method for cooling work pieces especially shape-rolled products from rail steel |
US11/880,635 Expired - Fee Related US7854883B2 (en) | 2001-08-01 | 2007-07-23 | System for cooling shape-rolled rails |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/880,635 Expired - Fee Related US7854883B2 (en) | 2001-08-01 | 2007-07-23 | System for cooling shape-rolled rails |
Country Status (10)
Country | Link |
---|---|
US (2) | US20040187974A1 (ru) |
EP (1) | EP1412543B1 (ru) |
JP (1) | JP4174423B2 (ru) |
KR (1) | KR100583301B1 (ru) |
CN (1) | CN1232661C (ru) |
AT (1) | ATE288503T1 (ru) |
DE (2) | DE10137596A1 (ru) |
ES (1) | ES2236592T3 (ru) |
RU (1) | RU2266966C2 (ru) |
WO (1) | WO2003012151A1 (ru) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080018027A1 (en) * | 2001-08-01 | 2008-01-24 | Klaus Kuppers | System for cooling shape-rolled rails |
ITLI20090004A1 (it) * | 2009-05-21 | 2010-11-22 | Lucchini S P A | Rotaie altoresistenziali a morfologia perlitica coloniale con elevato rapporto tenacita'-resistenza a rottura ed omogeneita' di proprieta' meccaniche e tecnologiche e relativo processo di fabbricazione. |
US9429374B2 (en) | 2012-02-06 | 2016-08-30 | Jfe Steel Corporation | Rail cooling method |
US10125405B2 (en) | 2012-06-11 | 2018-11-13 | Primetals Technologies Italy S.R.L. | Method and system for thermal treatments of rails |
US10131966B2 (en) * | 2014-02-21 | 2018-11-20 | Compagnie Generale Des Etablissements Michelin | Method for heat treatment with continuous cooling of a steel reinforcement element for tires |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007009937A1 (de) * | 2007-03-01 | 2008-09-04 | Schuler Smg Gmbh & Co. Kg | Verfahren zur Umformung einer Platine und Kühlvorrichtung für eine Platine |
ITMI20072244A1 (it) | 2007-11-28 | 2009-05-29 | Danieli Off Mecc | Dispositivo per trattamento termico di rotaie e relativo processo |
CA2756082C (en) * | 2009-03-27 | 2014-06-17 | Nippon Steel Corporation | Device and method for cooling rail weld zone |
RU2447163C1 (ru) | 2010-08-10 | 2012-04-10 | Общество С Ограниченной Ответственностью "Исследовательско-Технологический Центр "Аусферр" | Способ термической обработки изделий из сплавов на основе железа (варианты) |
DE102010049020B4 (de) * | 2010-10-21 | 2015-02-19 | Cmi M+W Engineering Gmbh | Vorrichtung zum Kühlen von auf einer Förderstrecke geförderten Metallbändern oder -blechen |
RU2456352C1 (ru) * | 2010-11-11 | 2012-07-20 | Общество С Ограниченной Ответственностью Научно-Производственное Предприятие "Томская Электронная Компания" | Способ и устройство термической обработки рельсов |
RU2484148C1 (ru) | 2011-10-27 | 2013-06-10 | Общество С Ограниченной Ответственностью Научно-Производственное Предприятие "Томская Электронная Компания" | Способ и установка термической обработки рельсов |
EP2644719A1 (de) | 2012-03-28 | 2013-10-02 | Siemens Aktiengesellschaft | Steuerung einer Kühlung |
RU2487178C1 (ru) * | 2012-06-01 | 2013-07-10 | Открытое акционерное общество "ЕВРАЗ Объединенный Западно-Сибирский металлургический комбинат" (ОАО "ЕВРАЗ ЗСМК") | Способ термической обработки рельсов |
CN102839268B (zh) | 2012-08-28 | 2014-08-13 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种贝氏体道岔钢轨的热处理方法 |
DE102012020844A1 (de) * | 2012-10-24 | 2014-04-24 | Thyssenkrupp Gft Gleistechnik Gmbh | Verfahren zur thermomechanischen Behandlung von warmgewalzten Profilen |
CN103898303B (zh) * | 2012-12-31 | 2016-06-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种道岔轨的热处理方法和道岔轨 |
CN109852782B (zh) * | 2019-01-09 | 2020-06-16 | 邯郸钢铁集团有限责任公司 | 消除r350lht钢轨热处理黑斑的方法 |
DE102020205252A1 (de) * | 2020-04-24 | 2021-10-28 | Kocks Technik Gmbh & Co Kg | Vorrichtung zum Kühlen von Langprodukten und Verfahren zum Kühlen eines Langproduktes unter Verwendung derselben |
DE102021212523A1 (de) | 2021-05-31 | 2022-12-01 | Sms Group Gmbh | Forcierte Luftkühlung zur Kühlung von Langstahlerzeugnissen |
JP2024522320A (ja) | 2021-05-31 | 2024-06-17 | エス・エム・エス・グループ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 長尺鋼製品を冷却するための強制的な空気冷却 |
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US4243441A (en) * | 1979-05-09 | 1981-01-06 | National Steel Corporation | Method for metal strip temperature control |
US4886558A (en) * | 1987-05-28 | 1989-12-12 | Nkk Corporation | Method for heat-treating steel rail head |
US6689230B1 (en) * | 1995-02-04 | 2004-02-10 | Sms Schloemann-Siemag Aktiengesellschaft | Method and apparatus for cooling hot-rolled sections |
Family Cites Families (8)
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DE1013759B (de) | 1955-12-30 | 1957-08-14 | Siemens Ag | Schutzschaltung fuer elektrische Mittel- oder Niederspannungsverteilungsanlagen |
US4486248A (en) * | 1982-08-05 | 1984-12-04 | The Algoma Steel Corporation Limited | Method for the production of improved railway rails by accelerated cooling in line with the production rolling mill |
JPS60221533A (ja) * | 1984-04-17 | 1985-11-06 | Mitsubishi Heavy Ind Ltd | 金属ストリツプの冷却装置 |
DE3579681D1 (de) * | 1984-12-24 | 1990-10-18 | Nippon Steel Corp | Verfahren und vorrichtung zum waermebehandeln von schienen. |
US4938460A (en) * | 1987-03-19 | 1990-07-03 | Chemetron-Railway Products, Inc. | Apparatus for air quenching railway heads |
DE19503747A1 (de) * | 1995-02-04 | 1996-08-08 | Schloemann Siemag Ag | Verfahren und Vorrichtung zum Abkühlen von warmgewalzten Profilen |
DE19850253A1 (de) * | 1998-10-31 | 2000-05-04 | Schloemann Siemag Ag | Verfahren und System zur Regelung von Kühlstrecken |
DE10137596A1 (de) | 2001-08-01 | 2003-02-13 | Sms Demag Ag | Verfahren zur Kühlung von Werkstücken, insbesondere von Profilwalzprodukten, aus Schienenstählen |
-
2001
- 2001-08-01 DE DE10137596A patent/DE10137596A1/de not_active Withdrawn
-
2002
- 2002-07-25 ES ES02776916T patent/ES2236592T3/es not_active Expired - Lifetime
- 2002-07-25 JP JP2003517324A patent/JP4174423B2/ja not_active Expired - Fee Related
- 2002-07-25 AT AT02776916T patent/ATE288503T1/de active
- 2002-07-25 WO PCT/EP2002/008271 patent/WO2003012151A1/de active IP Right Grant
- 2002-07-25 CN CNB028151186A patent/CN1232661C/zh not_active Expired - Fee Related
- 2002-07-25 EP EP02776916A patent/EP1412543B1/de not_active Revoked
- 2002-07-25 US US10/485,286 patent/US20040187974A1/en not_active Abandoned
- 2002-07-25 RU RU2004105954/02A patent/RU2266966C2/ru not_active IP Right Cessation
- 2002-07-25 KR KR1020047000443A patent/KR100583301B1/ko active IP Right Grant
- 2002-07-25 DE DE50202183T patent/DE50202183D1/de not_active Revoked
-
2007
- 2007-07-23 US US11/880,635 patent/US7854883B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4243441A (en) * | 1979-05-09 | 1981-01-06 | National Steel Corporation | Method for metal strip temperature control |
US4886558A (en) * | 1987-05-28 | 1989-12-12 | Nkk Corporation | Method for heat-treating steel rail head |
US6689230B1 (en) * | 1995-02-04 | 2004-02-10 | Sms Schloemann-Siemag Aktiengesellschaft | Method and apparatus for cooling hot-rolled sections |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080018027A1 (en) * | 2001-08-01 | 2008-01-24 | Klaus Kuppers | System for cooling shape-rolled rails |
US20100207305A9 (en) * | 2001-08-01 | 2010-08-19 | Klaus Kuppers | System for cooling shape-rolled rails |
US7854883B2 (en) * | 2001-08-01 | 2010-12-21 | Sms Meer Gmbh | System for cooling shape-rolled rails |
ITLI20090004A1 (it) * | 2009-05-21 | 2010-11-22 | Lucchini S P A | Rotaie altoresistenziali a morfologia perlitica coloniale con elevato rapporto tenacita'-resistenza a rottura ed omogeneita' di proprieta' meccaniche e tecnologiche e relativo processo di fabbricazione. |
US9429374B2 (en) | 2012-02-06 | 2016-08-30 | Jfe Steel Corporation | Rail cooling method |
US10125405B2 (en) | 2012-06-11 | 2018-11-13 | Primetals Technologies Italy S.R.L. | Method and system for thermal treatments of rails |
US10131966B2 (en) * | 2014-02-21 | 2018-11-20 | Compagnie Generale Des Etablissements Michelin | Method for heat treatment with continuous cooling of a steel reinforcement element for tires |
Also Published As
Publication number | Publication date |
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KR100583301B1 (ko) | 2006-05-25 |
DE10137596A1 (de) | 2003-02-13 |
JP2004537649A (ja) | 2004-12-16 |
CN1232661C (zh) | 2005-12-21 |
EP1412543A1 (de) | 2004-04-28 |
RU2004105954A (ru) | 2005-03-27 |
US20100207305A9 (en) | 2010-08-19 |
RU2266966C2 (ru) | 2005-12-27 |
US20080018027A1 (en) | 2008-01-24 |
EP1412543B1 (de) | 2005-02-02 |
ATE288503T1 (de) | 2005-02-15 |
US7854883B2 (en) | 2010-12-21 |
DE50202183D1 (de) | 2005-03-10 |
JP4174423B2 (ja) | 2008-10-29 |
WO2003012151A1 (de) | 2003-02-13 |
CN1537175A (zh) | 2004-10-13 |
KR20040015347A (ko) | 2004-02-18 |
ES2236592T3 (es) | 2005-07-16 |
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