AT94140B - Process for hardening steel rails. - Google Patents

Process for hardening steel rails.

Info

Publication number
AT94140B
AT94140B AT94140DA AT94140B AT 94140 B AT94140 B AT 94140B AT 94140D A AT94140D A AT 94140DA AT 94140 B AT94140 B AT 94140B
Authority
AT
Austria
Prior art keywords
temperature
air
rail
head
steel rails
Prior art date
Application number
Other languages
German (de)
Inventor
Christer Peter Sandberg
Original Assignee
Christer Peter Sandberg
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 Christer Peter Sandberg filed Critical Christer Peter Sandberg
Application granted granted Critical
Publication of AT94140B publication Critical patent/AT94140B/en

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  • Heat Treatment Of Articles (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zum Härten von   Stahlschiellen.   
 EMI1.1 
 

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 EMI2.1 
 einander abstehen, und in welches Luft von gewöhnlicher Temperatur unter einem Druck von 36 kg aus einem Hauptleitungsrohr c eingeleitet wird. Das Rohr a steht etwa 2'5 cm von Schierenkopf ab. 



   Die Kurve e in Fig. 2 veranschaulicht   die Abkühlungsgeschwindigkeit   der Schiene unter der Einwirkung der Luftstrahlen, während die   Kurve t d : e Geschwindigkeit   für die Abkühlung einer Schiene unter genau den gleichen Bedingungen zeigt, sobald sie der Aussenluft ausgesetzt wird ; die Ordinaten stellen die Zeiten, die Abszissen die Temperaturen dar. Wie Kurve e zeigt, wird in diesem Beispiele der obere Teil des Schienenkopfes von einer Temperatur von ungefähr   8000 C rasch   auf   6000 C gebracht.  



   <Desc / Clms Page number 1>
 



  Process for hardening steel tubes.
 EMI1.1
 

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 EMI2.1
 stand apart, and into which air of ordinary temperature is introduced under a pressure of 36 kg from a main pipe c. The pipe a protrudes about 2'5 cm from the Schierenkopf.



   Curve e in FIG. 2 illustrates the cooling rate of the rail under the action of the air jets, while curve t d: e shows the rate for cooling a rail under exactly the same conditions as soon as it is exposed to the outside air; the ordinates represent the times, the abscissas the temperatures. As curve e shows, in this example the upper part of the rail head is quickly brought from a temperature of approximately 8000 C to 6000 C.

Claims (1)

Diese Kühlung nimmt ungefähr Minuten in Anspruch (lässt man die gleiche Schiene an der Luft abkühlen, so würde sie in derselben Zeit, wie die Kurve ; zeigt, von 800 C nur auf 720 C sinken. This cooling takes about minutes (if the same rail is allowed to cool in the air, it would drop from 800 C to 720 C in the same time as the curve shows. Die Temperatur, auf welche der obere Teil des Schienenkopfes gekühlt werden muss, kann nicht genau angegeben werden, weil dies von verschiedenen Umständen abhängt, unter anderem vom Gewicht und von der Querschnittsform ; unbedingt erforderlich ist aber natürlich, dass die rasche Kühlung durch das gegen die Oberfläche des Schienenkopfes geschleuderte Kühlmittel eine derartige ist, dass die Tem- EMI2.2 Wärme der ganzen Masse während der natürlichen Abkühlung wieder auf die kritische Temperatur kommt, da sonst der Härtungsprozess rückgängig gemacht würde. The temperature to which the upper part of the rail head must be cooled cannot be specified precisely because this depends on various circumstances, including weight and cross-sectional shape; It is of course absolutely necessary that the rapid cooling by the coolant hurled against the surface of the rail head is such that the temperature EMI2.2 Heat from the whole mass comes back to the critical temperature during the natural cooling, otherwise the hardening process would be reversed. PATENT-ANSPRUCH : Verfahren zum Halten von Stahlsehienen unter Benützung der in den Schienen nach Beendigung des Walzvorganges verbleibenden Wärme, dadurch gekennzeichnet, dass nur der Kopf oder dessen oberer Teil durch feine Strahlen eines gasförmigen Kühlmittels, wie Luft oder Dampf, rasch unter die kritische EMI2.3 EMI2.4 PATENT CLAIM: Method for holding steel rails using the heat remaining in the rails after the end of the rolling process, characterized in that only the head or its upper part quickly falls below the critical level by fine jets of a gaseous coolant such as air or steam EMI2.3 EMI2.4
AT94140D 1914-08-22 1921-01-07 Process for hardening steel rails. AT94140B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB94140X 1914-08-22

Publications (1)

Publication Number Publication Date
AT94140B true AT94140B (en) 1923-09-10

Family

ID=9871496

Family Applications (1)

Application Number Title Priority Date Filing Date
AT94140D AT94140B (en) 1914-08-22 1921-01-07 Process for hardening steel rails.

Country Status (1)

Country Link
AT (1) AT94140B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE955775C (en) * 1953-02-12 1957-01-10 Bataafsche Petroleum Method and device for flame hardening rails

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE955775C (en) * 1953-02-12 1957-01-10 Bataafsche Petroleum Method and device for flame hardening rails

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