EP1760162B1 - Process for producing a shaft for compressors - Google Patents

Process for producing a shaft for compressors Download PDF

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Publication number
EP1760162B1
EP1760162B1 EP05019230A EP05019230A EP1760162B1 EP 1760162 B1 EP1760162 B1 EP 1760162B1 EP 05019230 A EP05019230 A EP 05019230A EP 05019230 A EP05019230 A EP 05019230A EP 1760162 B1 EP1760162 B1 EP 1760162B1
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EP
European Patent Office
Prior art keywords
steel
hardening
temperature
compressors
heat treatment
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.)
Not-in-force
Application number
EP05019230A
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German (de)
French (fr)
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EP1760162A1 (en
Inventor
Ralf Bode
Beate Dr. Langenhahn
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Siemens AG
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Siemens AG
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Priority to AT05019230T priority Critical patent/ATE405680T1/en
Priority to EP05019230A priority patent/EP1760162B1/en
Priority to DE502005005133T priority patent/DE502005005133D1/en
Publication of EP1760162A1 publication Critical patent/EP1760162A1/en
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Publication of EP1760162B1 publication Critical patent/EP1760162B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/78—Combined heat-treatments not provided for above
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F05D2300/17—Alloys
    • F05D2300/171—Steel alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/41—Leather

Definitions

  • the invention relates to a method for producing a shaft for compressors.
  • toughness means the property of being able to plastically deform under macroscopic mechanical stress under mechanical stress.
  • Toughness may also be the strength of the resistance that a body opposes to a plastic deformation; H. for the magnitude of the mechanical stress and / or energy that must be applied for deformation.
  • Brittleness can be called an opposite property.
  • a disadvantage of the 9% nickel steel is that it starts to flow comparatively early under mechanical stress.
  • shafts of compressors deform when exposed to different temperatures. This happens especially when the austenite occurs unevenly distributed in the wave.
  • the invention begins, the object of which is to provide a method for producing a shaft for compressors, whereby the cold toughness of a shaft is increased and the process is easy to implement.
  • the object is achieved by the method according to claim 1 Among other things, the advantage lies in the fact that the method offers a comparatively simple possibility of improving a steel in such a way that it has a high degree of cold toughness.
  • the invention is based on the aspect that a standard heat treatment, which provides a first and only hardening process at about 850 ° C with a tempering process at about 630 ° C in an air cooling, does not produce satisfactory properties of the steel.
  • a first hardening takes place at a first temperature and a second hardening at a second temperature under water quenching and with a subsequent tempering temperature in the specified temperature range
  • a steel is surprisingly produced, its cold toughness is comparatively high. This steel is thus used to at least minus 170 ° C as a shaft material for compressors.
  • martensitic steel of the type 3.5% Ni and 1.5% Cr in particular the steel 26NiCrMoV14-5 according to Stahl-Eisen-Werkstoffblatt (SEW) 555 is used.
  • martensitic steel is particularly suitable for this process.
  • martensitic steel is particularly simple and therefore less expensive to produce.
  • the steel 26NiCrMoV14-5 is a steel which can be provided by the heat treatment according to the invention with a comparatively high cold toughness.
  • This steel is used as a shaft material for compressors.
  • the 26NiCrMoV14-5 steel is a standard shaft material for turbines and generators and therefore better available than eg.
  • the steel X8Ni9 for example, must be produced in special melts.
  • 26NiCrMoV14-5 steel is less expensive than X8Ni9 due to its lower content of alloying elements.
  • Another advantage is that the martensitic crystal structure leads to a more favorable behavior under mechanical stress.
  • Another advantage is that a uniform crystal structure peculiarities in the thermal expansion behavior can be avoided.
  • the quenching in the hardening processes in steps a) and b) takes place in the water.
  • the temperature should be at the first hardening process in particular at about 950 ° C. Ideally, the temperature during the second cure should be around 850 ° C.
  • the temperature during the starting process should ideally be around 630 ° C.
  • This special heat treatment makes it possible to provide the 26NiCrMoV14-5 martensitic steel with such high cold toughness that it is used as a shaft material for compressors up to at least minus 170 ° C, not according to the invention. It has been shown that it can not be ruled out that good batches of 26NiCrMoV14-5 steel, even with standard heat treatment, have sufficient cold toughness, ie. H. in the standard heat treatment is first cured at about 850 ° C and quenched under water and then tempered at a temperature of 630 ° C with air cooling. However, to ensure very good levels of cold toughness, as required in cryogenic compressors, the heat treatment of the present invention is required.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)

Abstract

Procees for production of steel by heat treatment, including hardening and tempering by the steps:(a) hardening at 920-960[deg]C, (b) second hardening at 820-860[deg]C, (c) tempering with air cooling at 620-660[deg]C.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Welle für Kompressoren.The invention relates to a method for producing a shaft for compressors.

Im heutigen Maschinenbau ist es üblich, dass Stahl, beispielsweise in Verdichtern, bei tiefen Temperaturen von weniger als minus 100°C eingesetzt wird. Die meisten Stahlsorten haben eine ferritisch/martensitische Kristallstruktur und werden bei diesen tiefen Temperaturen sehr spröde. Diese Stahlsorten sind demnach für viele Anwendungen bei minus 100°C nicht mehr zu gebrauchen. Abhilfe könnte schaffen, statt Stahlsorten mit ferritisch/martensitischer Kristallstruktur andere, nämlich kaltzähe Stähle einzusetzen. Kaltzähe Stähle sind durch ihre austenitische Struktur charakterisiert und vergleichsweise weich. Darüber hinaus zeigen diese kaltzähen Stähle eine geringe Festigkeit.In today's mechanical engineering, it is common that steel, for example in compressors, at low temperatures of less than minus 100 ° C is used. Most steels have a ferritic / martensitic crystal structure and become very brittle at these low temperatures. Accordingly, these steel grades are no longer useful for many applications at minus 100 ° C. A remedy could be to use other, namely cold-tough steels instead of steel grades with ferritic / martensitic crystal structure. Cold-tough steels are characterized by their austenitic structure and comparatively soft. In addition, these cold-tough steels show low strength.

Unter Zähigkeit ist bei festen Körpern die Eigenschaft, sich unter mechanischer Beanspruchung makroskopisch messbar plastisch verformen zu können, zu verstehen. Unter Zähigkeit kann auch die Stärke des Widerstandes bezeichnet werden, den ein Körper einer plastischen Formänderung entgegensetzt, d. h. für die Größe der mechanischen Spannung und/oder Energie, die für eine Verformung aufgebracht werden müssen. Sprödigkeit kann als gegensätzliche Eigenschaft bezeichnet werden.In the case of solid bodies, toughness means the property of being able to plastically deform under macroscopic mechanical stress under mechanical stress. Toughness may also be the strength of the resistance that a body opposes to a plastic deformation; H. for the magnitude of the mechanical stress and / or energy that must be applied for deformation. Brittleness can be called an opposite property.

Um dennoch im anspruchsvollen Maschinenbau Stähle bei weniger als minus 100°C einsetzen zu können, werden Stähle mit höherer Festigkeit mit einem Gefügeanteil von 10% bis 20% Austenit verwendet. Diese Stähle zeigen darüber hinaus auch noch gute Tieftemperatureigenschaften. Der Anteil von 10% bis 20% Austenit ergibt sich durch eine gezielte Wärmebehandlung und einen Legierungsgehalt von 9% Nickel. Dieser Stahl ist auch unter der Normbezeichnung X8Ni9 bekannt.However, in order to be able to use steels at less than minus 100 ° C in demanding mechanical engineering, steels with higher strength and a proportion of 10% to 20% austenite are used. These steels also show still good low temperature properties. The proportion of 10% to 20% austenite results from a targeted heat treatment and an alloy content of 9% nickel. This steel is also known under the standard designation X8Ni9.

Allerdings ist ein Nachteil des 9%igen Nickelstahles, dass er unter mechanischer Beanspruchung vergleichsweise früh anfängt zu fließen. Darüber hinaus ist es möglich, dass sich beispielsweise Wellen von Verdichtern verformen, wenn diese unterschiedlichen Temperaturen ausgesetzt werden. Die geschieht vor allem dann, wenn der Austenit ungleichmäßig verteilt in der Welle auftritt.However, a disadvantage of the 9% nickel steel is that it starts to flow comparatively early under mechanical stress. In addition, it is possible that, for example, shafts of compressors deform when exposed to different temperatures. This happens especially when the austenite occurs unevenly distributed in the wave.

Aus dem Stahlschlüssel des Jahres 2004 (C.WEGST, M.WEGST, Verlag Stahlschlüssel WEGST GmbH) ist bereits ein martensitischer Werkstoff des Typs 26 NiCrMoV14-5 bekannt. Aus der JP 10 26 58 46 A ist bereits die Produktion von Stahlplatten im kontinuierlichen Gießverfahren bekannt mit einer nachfolgenden Wärmebehandlung in zwei Härtungsschritten und einem Anlassschritt. Aus der Druckschrift JP 02133518 A ist bereits eine Wärmebehandlung zur Herstellung von hochfesten Stellen mit guten Niedrigtemperatureigenschaften bekannt mit einem nicht-martensitischem Ausgangsprodukt, mit zwei Härtungen bei unterschiedlichen Temperaturen und einem Anlassen nachfolgend.From the steel key of 2004 (C.WEGST, M.WEGST, Verlag Stahlschlüssel WEGST GmbH) a martensitic material of the type 26 NiCrMoV14-5 is already known. From the JP 10 26 58 46 A Already the production of steel plates in the continuous casting process is known with a subsequent heat treatment in two hardening steps and a tempering step. From the publication JP 02133518 A is already a heat treatment for the production of high-strength points with good low-temperature properties known with a non-martensitic starting product, with two curing at different temperatures and tempering below.

An dieser Stelle setzt die Erfindung an, deren Aufgabe es ist, ein Verfahren zur Herstellung einer welle für Kompressoren anzugeben, wodurch die Kaltzähigkeit eine welle erhöht wird und das Verfahren einfach umzusetzen ist.At this point, the invention begins, the object of which is to provide a method for producing a shaft for compressors, whereby the cold toughness of a shaft is increased and the process is easy to implement.

Die Aufgabe wird gelöst durch das Verfahren gemäß Anspruch 1 Der Vorteil ist unter anderem darin zu sehen, dass mit dem Verfahren eine vergleichsweise einfache Möglichkeit angeboten wird, einen Stahl dahingehend zu verbessern, dass dieser eine hohe Kaltzähigkeit besitzt. Die Erfindung geht hierbei von dem Aspekt aus, dass eine Standardwärmebehandlung, die bei ca. 850°C einen ersten und einzigen Härtevorgang mit einem Anlassvorgang bei ca. 630°C bei einer Luftkühlung vorsieht, keine befriedigenden Eigenschaften des Stahles hervorbringt. Durch das erfindungsgemäße Wärmebehandeln, bei dem ein erstes Härten bei einer ersten Temperatur und ein zweites Härten bei einer zweiten Temperatur unter Wasserabschreckung erfolgt und mit einer anschließenden Anlasstemperatur im angegebenen Temperaturbereich wird überraschenderweise ein Stahl erzeugt, dessen Kaltzähigkeit vergleichsweise hoch ist. Dieser Stahl wird dadurch bis mindestens minus 170°C als Wellenmaterial für Kompressoren verwendet.The object is achieved by the method according to claim 1 Among other things, the advantage lies in the fact that the method offers a comparatively simple possibility of improving a steel in such a way that it has a high degree of cold toughness. The invention is based on the aspect that a standard heat treatment, which provides a first and only hardening process at about 850 ° C with a tempering process at about 630 ° C in an air cooling, does not produce satisfactory properties of the steel. By the heat treatment according to the invention, in which a first hardening takes place at a first temperature and a second hardening at a second temperature under water quenching and with a subsequent tempering temperature in the specified temperature range, a steel is surprisingly produced, its cold toughness is comparatively high. This steel is thus used to at least minus 170 ° C as a shaft material for compressors.

In einer vorteilhaften Weiterbildung wird bei dem Verfahren martensitischer Stahl vom Typ 3,5%Ni und 1,5%Cr insbesondere der Stahl 26NiCrMoV14-5 gemäß Stahl-Eisen-Werkstoffblatt (SEW) 555 verwendet.In an advantageous development, in the method martensitic steel of the type 3.5% Ni and 1.5% Cr, in particular the steel 26NiCrMoV14-5 according to Stahl-Eisen-Werkstoffblatt (SEW) 555 is used.

Es hat sich gezeigt, dass gerade ein martensitischer Stahl besonders geeignet ist für dieses Verfahren. Darüber hinaus ist martensitischer Stahl besonders einfach und dadurch kostengünstiger herzustellen.It has been shown that especially a martensitic steel is particularly suitable for this process. In addition, martensitic steel is particularly simple and therefore less expensive to produce.

Besonders der Stahl 26NiCrMoV14-5 ist ein Stahl, der durch die erfindungsgemäße Wärmebehandlung mit einer vergleichsweisen hohen Kaltzähigkeit versehen werden kann. Dieser Stahl als Wellenmaterial für Kompressoren verwendet. Darüber hinaus ist der Stahl 26NiCrMoV14-5 ein sozusagen Standardwellenmaterial für Turbinen und Generatoren und deshalb besser verfügbar als z. B. der Stahl mit der Bezeichnung X8Ni9. Der Stahl X8Ni9 muss beispielsweise in Sonderschmelzen erzeugt werden. Des Weiteren ist der Stahl 26NiCrMoV14-5 durch seinen niedrigeren Gehalt an Legierungselementen preisgünstiger als X8Ni9.Especially the steel 26NiCrMoV14-5 is a steel which can be provided by the heat treatment according to the invention with a comparatively high cold toughness. This steel is used as a shaft material for compressors. In addition, the 26NiCrMoV14-5 steel is a standard shaft material for turbines and generators and therefore better available than eg. As the steel with the name X8Ni9. The steel X8Ni9, for example, must be produced in special melts. Furthermore, 26NiCrMoV14-5 steel is less expensive than X8Ni9 due to its lower content of alloying elements.

Ein weiterer Vorteil ist, dass die martensitische Kristallstruktur zu einem günstigeren Verhalten bei mechanischer Beanspruchung führt.Another advantage is that the martensitic crystal structure leads to a more favorable behavior under mechanical stress.

Ein weiterer Vorteil ist, dass durch eine einheitliche Kristallstruktur Besonderheiten beim thermischen Ausdehnungsverhalten vermieden werden.Another advantage is that a uniform crystal structure peculiarities in the thermal expansion behavior can be avoided.

In einer weiteren vorteilhaften Weiterbildung erfolgt die Abschreckung bei den Härtevorgängen in den Schritten a) und b) im Wasser.In a further advantageous development, the quenching in the hardening processes in steps a) and b) takes place in the water.

Dadurch ist eine Möglichkeit angegeben, den Härtevorgang besonders preisgünstig zu gestalten. Ein weiterer Aspekt hierbei ist, dass das Abschrecken mit Wasser zu guten Resultaten führt.As a result, a possibility is given to make the hardening process particularly inexpensive. Another aspect here is that quenching with water leads to good results.

In einer weiteren vorteilhaften Weiterbildung wird der Anlassvorgang unter Luftabkühlung durchgeführt.In a further advantageous development of the starting process is carried out under air cooling.

Auch hier ist der besondere Vorteil darin zu sehen, dass durch die Luftabkühlung ein einfaches Verfahren angeboten wird, mit dem sehr gute Resultate erzielt werden. Der durch dieses Verfahren erzeugte Stahl zeigt eine sehr hohe Kaltzähigkeit.Again, the particular advantage is the fact that the air cooling a simple process is offered, are achieved with the very good results. The steel produced by this process shows a very high cold toughness.

Ausführungsbeispiele der Erfindung werden nachfolgend näher beschrieben.Embodiments of the invention will be described in more detail below.

Anstelle eines 9%igen Nickel-Stahls wird der Stahl 26NiCrMoV14-5 verwendet. Es wird ein Verfahren zur Erhöhung der Kaltzähigkeit von Stählen angewandt, wobei eine Wärmebehandlung durchgeführt wird, die sich durch folgende Schritte auszeichnet:

  1. 1) Härten bei einer Temperatur zwischen 920°C und 960°C,
  2. 2) Durchführen einer zweiten Härtung bei einer Temperatur zwischen 820°C und 860°C und
  3. 3) Anlassen bei einer Temperatur zwischen 620°C und 660°C.
Instead of a 9% nickel steel, the steel 26NiCrMoV14-5 is used. A method is used for increasing the cold toughness of steels, wherein a heat treatment is carried out, which is characterized by the following steps:
  1. 1) curing at a temperature between 920 ° C and 960 ° C,
  2. 2) carrying out a second curing at a temperature between 820 ° C and 860 ° C and
  3. 3) Tempering at a temperature between 620 ° C and 660 ° C.

Es hat sich gezeigt, dass die Temperatur bei dem ersten Härtevorgang insbesondere bei ca. 950°C sein sollte. Idealerweise sollte die Temperatur bei der zweiten Härtung bei einem Wert von ca. 850°C liegen.It has been shown that the temperature should be at the first hardening process in particular at about 950 ° C. Ideally, the temperature during the second cure should be around 850 ° C.

Es hat sich ebenso gezeigt, dass die Temperatur während des Anlassvorganges idealerweise bei ca. 630°C sein sollte.It has also been shown that the temperature during the starting process should ideally be around 630 ° C.

Durch diese besondere Wärmebehandlung ist es möglich, den martensitischen Stahl 26NiCrMoV14-5 mit einer so hohen Kaltzähigkeit zu versehen, dass er bis mindestens minus 170°C als Wellenmaterial für Kompressoren verwendet wird nicht erfirdungsgemäß. Es hat sich gezeigt, dass es nicht auszushließen ist, dass gute Chargen des Stahls 26NiCrMoV14-5 auch mit der Standardwärmebehandlung ausreichende Kaltzähigkeit aufweisen, d. h. bei der Standardwärmebehandlung wird zunächst bei ca. 850°C gehärtet und unter Wasser abgeschreckt und anschließend bei einer Temperatur von 630°C angelassen unter Luftabkühlung. Aber um sehr gute Werte hinsichtlich der Kaltzähigkeit sicherzustellen, wie sie in Tieftemperaturkompressoren benötigt werden, ist jedoch die erfindungsgemäße Wärmebehandlung erforderlich.This special heat treatment makes it possible to provide the 26NiCrMoV14-5 martensitic steel with such high cold toughness that it is used as a shaft material for compressors up to at least minus 170 ° C, not according to the invention. It has been shown that it can not be ruled out that good batches of 26NiCrMoV14-5 steel, even with standard heat treatment, have sufficient cold toughness, ie. H. in the standard heat treatment is first cured at about 850 ° C and quenched under water and then tempered at a temperature of 630 ° C with air cooling. However, to ensure very good levels of cold toughness, as required in cryogenic compressors, the heat treatment of the present invention is required.

Claims (4)

  1. Method for producing a shaft for compressors from a shaft material, in which heat treatment which comprises hardening and annealing is carried out on a martensitic steel and is characterized by the following steps:
    a) hardening at a temperature of between 920°C and 960°C,
    b) carrying out a second hardening at a temperature of between 820°C and 860°C,
    c) subsequently, annealing at a temperature of between 620°C and 660°C.
  2. Method according to Claim 1, in which the steel 26NiCrMoV14-5 is used.
  3. Method according to Claim 1 or 2, in which the quenchings during the hardening operations in steps a) and b) take place in water.
  4. Method according to one of the preceding claims, in which the annealing operation takes place with air cooling.
EP05019230A 2005-09-05 2005-09-05 Process for producing a shaft for compressors Not-in-force EP1760162B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT05019230T ATE405680T1 (en) 2005-09-05 2005-09-05 METHOD FOR PRODUCING A SHAFT FOR COMPRESSORS
EP05019230A EP1760162B1 (en) 2005-09-05 2005-09-05 Process for producing a shaft for compressors
DE502005005133T DE502005005133D1 (en) 2005-09-05 2005-09-05 Method for producing a shaft for compressors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05019230A EP1760162B1 (en) 2005-09-05 2005-09-05 Process for producing a shaft for compressors

Publications (2)

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EP1760162A1 EP1760162A1 (en) 2007-03-07
EP1760162B1 true EP1760162B1 (en) 2008-08-20

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CN114990316B (en) * 2022-06-20 2024-06-25 重庆长征重工有限责任公司 Heat treatment method for main shaft of wind generating set

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Publication number Priority date Publication date Assignee Title
SU1439133A1 (en) * 1986-12-08 1988-11-23 Алтайский тракторный завод им.М.И.Калинина Method of heat treatment of structural steel
SU1423609A1 (en) * 1987-02-17 1988-09-15 Институт Механики Ан Усср Method of heat treatment of cryogenic equipment articles made of martensitic-ageing steels
JPH02133518A (en) * 1988-11-14 1990-05-22 Sumitomo Metal Ind Ltd Production of high tensile steel products having excellent low-temperature toughness
JPH04325625A (en) * 1991-04-24 1992-11-16 Sumitomo Metal Ind Ltd Production of non-ni-added-type high tensile strength steel with high toughness
JP4134355B2 (en) * 1997-03-25 2008-08-20 Ｊｆｅスチール株式会社 Manufacturing method of continuous cast tempered high strength steel plate with excellent toughness
JP3387427B2 (en) * 1997-11-27 2003-03-17 アイシン精機株式会社 Heat treatment method for steel

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EP1760162A1 (en) 2007-03-07
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