EP1764422B1 - Method for fabricating housing from austenitic steel. - Google Patents
Method for fabricating housing from austenitic steel. Download PDFInfo
- Publication number
- EP1764422B1 EP1764422B1 EP20050020130 EP05020130A EP1764422B1 EP 1764422 B1 EP1764422 B1 EP 1764422B1 EP 20050020130 EP20050020130 EP 20050020130 EP 05020130 A EP05020130 A EP 05020130A EP 1764422 B1 EP1764422 B1 EP 1764422B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casing
- housing
- ring
- cylinder
- austenitic steel
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/06—Shaping thick-walled hollow articles, e.g. projectiles
-
- 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
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
- C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
-
- 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
- C21D2211/001—Austenite
Definitions
- the invention relates to a method for producing a housing with welded neck, in particular a compressor housing made of austenitic steel.
- Turbomachinery Hydraulic turbines, steam and gas turbines, wind turbines, centrifugal pumps and centrifugal compressors as well as propellers are summarized under the collective term "turbomachinery”. Common to all these machines is that they serve the purpose of depriving one fluid of energy, thereby driving another machine, or conversely, supplying energy to a fluid to increase its pressure.
- Compressor is here understood to mean a working machine for compressing gases, vapors or the like. Compressors are sometimes used at very low operating temperatures. It may happen that the operating temperatures are less than minus 120 ° C. At these low operating temperatures, cold-hard steels having an austenitic crystal structure are used as material for the casings of the compressors. However, such cold-tough steels with austenitic crystal structure have only a low strength. In the case of solid bodies, toughness means the property of being able to plastically deform under macroscopic mechanical strain under mechanical stress.
- Toughness may also be understood as the strength of the resistance that a body opposes to a plastic deformation, ie, the magnitude of the stress and / or energy that must be applied for deformation.
- the opposite of toughness can be called brittleness.
- Under the Strength is the resistance of a component or material to a change in shape or fracture stress, with a distinction between pressure, tensile, bending, shear or shear and torsional or torsional strength.
- the casings of the compressors are designed for high temperature, low temperature applications to withstand the internal pressure at low material strengths. Since the austenitic steels also have a low thermal conductivity and a high coefficient of thermal expansion, there is the danger of large temperature transients within the housing and thus the risk of thermal stresses to permanent plastic deformation.
- the invention sets in whose task it is to provide a method for increasing the strength of housings, for which steels can be used, which can be used at low temperatures.
- the invention is based on the recognition that the strength of austenitic steels can be significantly increased by being plastically deformed before stress relief annealing, without the low temperature toughness substantially decreasing.
- the plastic deformation is achieved by mechanical stretching in step 1).
- the austenitic steel is provided as a cylinder housing or as a ring, and the step 1) is carried out by widening the cylinder housing or the diameter of the cylinder housing or the ring with a deforming device and the thickness of the cylinder housing or of the ring is reduced.
- the invention is based on the aspect that if the austenitic steel is present as a cylinder housing or as a ring, there is a very cost-effective way to plastically deform the ring as a whole.
- a deformation device is attached to the cylinder housing or the ring in such a way that they are uniformly stretched by a uniform force transmission.
- the deformation device comprises a conical cylinder.
- the deforming means may also comprise hydraulic means.
- a nozzle on an outer wall of the cylinder housing or the ring arranged and welded in a next step to the cylinder housing or the ring, wherein in a next step, the ring is solution annealed and quenched with the neck and then a plastic deformation, wherein the cylinder housing or the ring are widened, wherein in a next step, the ring is stress-annealed with the neck and then drilled passages through the neck and the ring.
- the invention is based on the aspect that it is advantageous if nozzles are to be attached to the cylinder housing or the ring, that they are attached before stress relief annealing.
- a compressor housing made of an austenitic steel, wherein the compressor housing is formed substantially annular, wherein the compressor housing was prepared by a method according to any one of claims 1 to 4.
- FIG. 1 6 sub-steps for the production of the compressor housing 1 are shown.
- FIG. 1 is a sectional view of the housing 1 can be seen. The length of the housing 1 is therefore from the FIG. 1 not to be taken.
- a compressor housing 1 as an embodiment of a cylinder housing or ring at least comprising a housing 2 and two nozzles 4a and 4b shown.
- the housing 2 is made of an austenitic steel and is formed substantially annular.
- the housing 2 is formed annularly about a rotation axis 3.
- two stubs 4a and 4b are provided with a bore 5a and 5b.
- nozzles 4a and 4b are welded to an outer wall 6 of the housing 2.
- step 3 the housing 2 is solution annealed and quenched with the nozzles 4a and 4b.
- the solution heat treatment takes place at temperatures and over periods of time that depend on the choice of material of the housing.
- the quenching of the housing and the nozzle is done by conventional methods.
- step 4 the housing 2 is plastically deformed by a deformation device, not shown, whereby the thickness 7 of the housing 2 is reduced.
- the deforming means may comprise a conical cylinder.
- the deformation device may comprise hydraulic power drives.
- other deformation devices are conceivable as well.
- step 5 the housing 2 and the nozzles 4a and 4b are stress relieved.
- the temperature and duration of the stress relief annealing is done according to conventional process values, which depend on the choice of austenitic steel.
- step 6 passages 8a and 8b are bored through the housing 2. Subsequently, a mechanical processing takes place.
- FIG. 2 the influence of cold deformation on the mechanical properties of the material X5CrNiTi18-10, 1.4541 is shown.
- the strain is plotted in percent.
- the consumed impact energy 18 is plotted in the Charpy impact test at minus 196 ° C.
- Curve 12 shows a clear increase in the 0.2% proof stress as a function of the elongation. At 5% elongation, the 0.2% proof stress has a value of 300 MPa. At an elongation of approximately 50%, the 0.2% proof stress has a threefold value which is approximately 900 MPa.
- wall thicknesses for compressor housing 1 can be reduced. This would require significantly less material. Another advantage would be that temperature transients and thermal stresses decrease. In addition, the risk of plastic deformation would be reduced by thermal stresses.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Health & Medical Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Compressor (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Gehäuses mit angeschweißten Stutzen, insbesondere eines Verdichtergehäuses, aus austenitischem Stahl.The invention relates to a method for producing a housing with welded neck, in particular a compressor housing made of austenitic steel.
Unter der Sammelbezeichnung "Strömungsmaschinen" werden Wasserturbinen, Dampf- und Gasturbinen, Windräder, Kreiselpumpen und Kreiselverdichter sowie Propeller zusammengefasst. Allen diesen Maschinen ist gemeinsam, dass sie dem Zweck dienen einem Fluid Energie zu entziehen, um damit eine andere Maschine anzutreiben oder umgekehrt, einem Fluid Energie zuzuführen, um dessen Druck zu erhöhen.Hydraulic turbines, steam and gas turbines, wind turbines, centrifugal pumps and centrifugal compressors as well as propellers are summarized under the collective term "turbomachinery". Common to all these machines is that they serve the purpose of depriving one fluid of energy, thereby driving another machine, or conversely, supplying energy to a fluid to increase its pressure.
Die Gehäuse von Verdichtern müssen so ausgelegt werden, dass sie einem hohen Innendruck standhalten. Unter Verdichter wird hierbei eine Arbeitsmaschine zum Verdichten von Gasen, Dämpfen oder Ähnlichem verstanden. Verdichter werden zum Teil bei sehr niedrigen Betriebstemperaturen eingesetzt. Es kann dabei vorkommen, dass die Betriebstemperaturen bei weniger als minus 120°C liegen. Bei diesen tiefen Betriebstemperaturen werden als Material für die Gehäuse der Verdichter kaltzähe Stähle mit einer austenitischen Kristallstruktur eingesetzt. Allerdings besitzen solche kaltzähe Stähle mit austenitischer Kristallstruktur lediglich eine geringe Festigkeit. Unter Zähigkeit wird bei festen Körpern die Eigenschaft verstanden, sich unter mechanischer Beanspruchung makroskopisch messbar plastisch verformen zu können. Zähigkeit kann auch als die Stärke des Widerstands, 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, verstanden werden. Das Gegenteil von Zähigkeit kann als Sprödigkeit bezeichnet werden. Unter der Festigkeit wird die Widerstandsfähigkeit eines Bauteils oder Materials gegenüber einer Formänderung oder bruchführenden Beanspruchung verstanden, wobei entsprechend zwischen Druck-, Zug-, Biege-, Scher- oder Schub- und Torsions- oder Verdrehfestigkeit unterschieden wird.The housings of compressors must be designed so that they can withstand high internal pressure. Compressor is here understood to mean a working machine for compressing gases, vapors or the like. Compressors are sometimes used at very low operating temperatures. It may happen that the operating temperatures are less than minus 120 ° C. At these low operating temperatures, cold-hard steels having an austenitic crystal structure are used as material for the casings of the compressors. However, such cold-tough steels with austenitic crystal structure have only a low strength. In the case of solid bodies, toughness means the property of being able to plastically deform under macroscopic mechanical strain under mechanical stress. Toughness may also be understood as the strength of the resistance that a body opposes to a plastic deformation, ie, the magnitude of the stress and / or energy that must be applied for deformation. The opposite of toughness can be called brittleness. Under the Strength is the resistance of a component or material to a change in shape or fracture stress, with a distinction between pressure, tensile, bending, shear or shear and torsional or torsional strength.
Aus dem
Damit ein sicherer Betrieb eines Verdichters bei tiefen Betriebstemperaturen gewährleistet ist, werden die Gehäuse der Verdichter für Tieftemperaturanwendungen mit großen Wandstärken ausgebildet, um bei niedriger Festigkeit des Werkstoffs dem Innendruck standhalten zu können. Da die austenitischen Stähle außerdem eine geringe Wärmeleitfähigkeit und einen hohen thermischen Ausdehnungskoeffizienten aufweisen, besteht die Gefahr von großen Temperaturtransienten innerhalb des Gehäuses und damit die Gefahr thermischer Spannungen bis hin zu bleibenden plastischen Verformungen.To ensure safe operation of a compressor at low operating temperatures, the casings of the compressors are designed for high temperature, low temperature applications to withstand the internal pressure at low material strengths. Since the austenitic steels also have a low thermal conductivity and a high coefficient of thermal expansion, there is the danger of large temperature transients within the housing and thus the risk of thermal stresses to permanent plastic deformation.
An dieser Stelle setzt die Erfindung ein, deren Aufgabe es ist, ein Verfahren zur Erhöhung der Festigkeit von Gehäusen anzugeben, für welche Stähle verwendet werden können, die bei tiefen Temperaturen eingesetzbar sind.At this point, the invention sets in whose task it is to provide a method for increasing the strength of housings, for which steels can be used, which can be used at low temperatures.
Diese Aufgabe wird gelöst durch ein verfahren nach Anspruch 1. Die rückbezogenen Unteransprüche beinhalten vorteilhafte Weiterbildungen.This object is achieved by a method according to
Die Erfindung geht von der Erkenntnis aus, dass die Festigkeit austenitischer Stähle sich erheblich steigern lässt, indem sie vor einer Spannungsarmglühung plastisch verformt werden, ohne dass die Tieftemperaturzähigkeit dabei wesentlich abnimmt.The invention is based on the recognition that the strength of austenitic steels can be significantly increased by being plastically deformed before stress relief annealing, without the low temperature toughness substantially decreasing.
Versuche haben gezeigt, dass hierbei durch eine plastische Vorverformung die Festigkeit auf das Dreifache erhöht werden kann.Experiments have shown that by a plastic pre-deformation the strength can be increased to three times.
In einer vorteilhaften Weiterbildung wird in Schritt 1) die plastische Verformung durch mechanisches Dehnen erwirkt.In an advantageous development, the plastic deformation is achieved by mechanical stretching in step 1).
Dadurch ist ein sehr einfacher Verfahrensschritt angegeben, um eine plastische Verformung zu realisieren. Andere Verfahrensschritte zur plastischen Verformung sind denkbar, z. B. hydraulisches oder pneumatisches Dehnen unter Innendruck oder auch Kaltwalzen.As a result, a very simple method step is specified in order to realize a plastic deformation. Other process steps for plastic deformation are conceivable, for. As hydraulic or pneumatic stretching under internal pressure or cold rolling.
Gemäß der Erfindung wird der austenitische Stahl als Zylinder-Gehäuse oder als Ring vor und der Schritt 1) erfolgt dadurch, dass mit einer Verformungseinrichtung das Zylinder-Gehäuse oder der Durchmesser des Zylinder-Gehäuses oder des Ringes geweitet und die Dicke des Zylinder-Gehäuses oder des Ringes verringert wird.According to the invention, the austenitic steel is provided as a cylinder housing or as a ring, and the step 1) is carried out by widening the cylinder housing or the diameter of the cylinder housing or the ring with a deforming device and the thickness of the cylinder housing or of the ring is reduced.
Die Erfindung geht hierbei von dem Aspekt aus, dass, wenn der austenitische Stahl als Zylinder-Gehäuse oder als Ring vorliegt, es eine sehr kostengünstige Möglichkeit gibt, den Ring insgesamt plastisch zu verformen. Dabei wird eine Verformungseinrichtung an das Zylinder-Gehäuse oder den Ring derart angebracht, dass durch eine gleichmäßige Kraftübertragung diese gleichmäßig gedehnt werden.The invention is based on the aspect that if the austenitic steel is present as a cylinder housing or as a ring, there is a very cost-effective way to plastically deform the ring as a whole. In this case, a deformation device is attached to the cylinder housing or the ring in such a way that they are uniformly stretched by a uniform force transmission.
In einer vorteilhaften Weiterbildung umfasst die Verformungseinrichtung einen konischen Zylinder.In an advantageous development, the deformation device comprises a conical cylinder.
Dadurch wird eine besonders einfache Möglichkeit angeboten, die Verformungseinrichtung derart zu gestalten, dass durch eine lineare Bewegung des konischen Zylinders eine Kraft auf die Innenseite des Zylinder-Gehäuses oder des Ringes ausgeübt wird, wodurch diese insgesamt geweitet werden. Andere Verformungseinrichtungen sind möglich. Die Verformungseinrichtung kann auch hydraulische Mittel umfassen.Thereby, a particularly simple possibility is offered to make the deformation device such that a force is exerted on the inside of the cylinder housing or the ring by a linear movement of the conical cylinder, whereby they are widened as a whole. Other deformation devices are possible. The deforming means may also comprise hydraulic means.
Gemäß der Erfindung wird ein Stutzen an einer äußeren Wand des Zylinder-Gehäuses oder des Ringes angeordnet und in einem nächsten Schritt an das Zylinder-Gehäuse oder den Ring angeschweißt, wobei in einem nächsten Schritt der Ring mit dem Stutzen lösungsgeglüht und abgeschreckt wird und anschließend eine plastische Verformung erfolgt, wobei das Zylinder-Gehäuse oder der Ring aufgeweitet werden, wobei in einem nächsten Schritt der Ring mit dem Stutzen spannungsarm geglüht wird und anschließend Durchtritte durch den Stutzen und den Ring gebohrt werden.According to the invention, a nozzle on an outer wall of the cylinder housing or the ring arranged and welded in a next step to the cylinder housing or the ring, wherein in a next step, the ring is solution annealed and quenched with the neck and then a plastic deformation, wherein the cylinder housing or the ring are widened, wherein in a next step, the ring is stress-annealed with the neck and then drilled passages through the neck and the ring.
Die Erfindung geht hierbei von dem Aspekt aus, dass es vorteilhaft ist, wenn Stutzen an dem Zylinder-Gehäuse oder dem Ring angebracht werden sollen, dass diese vor dem Spannungsarmglühen angebracht werden.The invention is based on the aspect that it is advantageous if nozzles are to be attached to the cylinder housing or the ring, that they are attached before stress relief annealing.
Somit wird ein Verdichtergehäuse aus einem austenitischen Stahl hergestellt, wobei das Verdichtergehäuse im wesentlichen ringförmig ausgebildet ist, wobei das Verdichtergehäuse mit einem Verfahren nach einem der Ansprüche 1 bis 4 hergestellt wurde.Thus, a compressor housing made of an austenitic steel, wherein the compressor housing is formed substantially annular, wherein the compressor housing was prepared by a method according to any one of
Ausführungsbeispiele der Erfindung werden nachfolgend unter Bezugnahme auf die Zeichnungen näher beschrieben. Dabei haben mit denselben Bezugszeichen versehene Komponenten die gleiche Funktionsweise.Embodiments of the invention are described below with reference to the drawings. In this case, provided with the same reference numerals components have the same operation.
Dabei zeigen
Figur 1- eine schematische Darstellung der Herstellung eines Verdichtergehäuses mit Stutzen,
Figur 2- ein Diagramm zur Verdeutlichung eines Einflusses der Kaltverformung auf mechanische Eigenschaften für den Werkstoff X5CrNiTi18-10,
Figur 3- ein Diagramm zur Verdeutlichung des Einflusses der Spannungsarmglühtemperatur auf die mechanischen Eigenschaften auf den Werkstoff X5CrNiTi18-10.
- FIG. 1
- a schematic representation of the production of a compressor housing with nozzle,
- FIG. 2
- a diagram to illustrate an influence of cold working on mechanical properties for the material X5CrNiTi18-10,
- FIG. 3
- a diagram illustrating the influence of stress relief annealing temperature on the mechanical properties on the material X5CrNiTi18-10.
In der
In der
In
In einem Schritt 1) werden zwei Stutzen 4a und 4b mit einer Bohrung 5a und 5b bereitgestellt.In the
In the
In
In a step 1) two
In einem Schritt 2) werden die Stutzen 4a und 4b an eine äußere Wand 6 des Gehäuses 2 angeschweißt.In a step 2), the
Im Schritt 3) wird das Gehäuse 2 mit den Stutzen 4a und 4b lösungsgeglüht und abgeschreckt. Das Lösungsglühen erfolgt bei Temperaturen und über Zeitdauern hinweg, die von der Wahl des Materials des Gehäuses abhängen. Das Abschrecken des Gehäuses und der Stutzen erfolgt nach herkömmlichen Verfahren.In step 3), the
Im Schritt 4) wird das Gehäuse 2 über eine nicht näher dargestellte Verformungseinrichtung plastisch verformt, wodurch sich die Dicke 7 des Gehäuses 2 verringert.In step 4), the
Die Verformungseinrichtung kann einen konischen Zylinder umfassen. In alternativen Ausführungsformen kann die Verformungseinrichtung hydraulische Kraftantriebe umfassen. Es sind aber ebenso andere Verformungseinrichtungen denkbar.The deforming means may comprise a conical cylinder. In alternative embodiments, the deformation device may comprise hydraulic power drives. However, other deformation devices are conceivable as well.
Im Schritt 5) werden das Gehäuse 2 und die Stutzen 4a und 4b spannungsarm geglüht. Die Temperatur und die Dauer des Spannungsarmglühens erfolgt nach herkömmlichen Verfahrenswerten, die von der Wahl des austenitischen Stahls abhängen.In step 5), the
Im Schritt 6) erfolgt ein Bohren von Durchtritten 8a und 8b durch das Gehäuse 2. Anschließend erfolgt eine mechanische Bearbeitung.In step 6),
In der
Versuche haben gezeigt, dass die 0,2%-Dehngrenze des Standardstahls X6CrNiTi18-10 durch eine 25%ige Vorverformung von 200 MPa auf 600 MPa ansteigt.Tests have shown that the 0.2% proof strength of the standard steel X6CrNiTi18-10 increases from 200 MPa to 600 MPa by a 25% pre-deformation.
In der
In der
Durch das in
Claims (4)
- Method for producing a casing with a welded-on connection piece, in particular a compressor casing, from austenitic steel,
characterized by the following steps:1) a connection piece (4a, 4b) is arranged on an outer wall (6) of a casing (2), and, in a2) next step, is welded to the casing (2),3) in a next step the casing (2), together with the connection piece (4a, 4b), being solution-annealed and quenched, and subsequently4) plastic deformation of the austenitic steel taking place, the casing (2) being expanded,5) in a next step, the casing (2), together with the connection piece (4a, 4b), being stress-relief-annealed, and,6) subsequently, passages being drilled through the connection piece (4a, 4b) and the casing (2). - Method according to Claim 1, in which, in step 1), the plastic deformation takes place by means of mechanical stretching.
- Method according to Claim 1 or 2, in which the austenitic steel is essentially in the form of a cylinder casing (1) or ring (1), and step 1) takes place in that, by means of a deformation device, the diameter of the cylinder casing (1) or of the ring (1) is expanded and the thickness of the cylinder casing (1) or of the ring (1) is reduced.
- Method according to Claim 3, in which a conical cylinder is used in the deformation device and the cylinder casing (1) or the ring (1) is expanded by the conical cylinder being moved.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200550004415 DE502005004415D1 (en) | 2005-09-15 | 2005-09-15 | Method for producing an austenitic steel housing. |
EP20050020130 EP1764422B1 (en) | 2005-09-15 | 2005-09-15 | Method for fabricating housing from austenitic steel. |
CNB2006101729847A CN100519777C (en) | 2005-09-15 | 2006-09-15 | Method for fabricating austenitic steel and compressor casing produced therefrom |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP20050020130 EP1764422B1 (en) | 2005-09-15 | 2005-09-15 | Method for fabricating housing from austenitic steel. |
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EP1764422A1 EP1764422A1 (en) | 2007-03-21 |
EP1764422B1 true EP1764422B1 (en) | 2008-06-11 |
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EP20050020130 Not-in-force EP1764422B1 (en) | 2005-09-15 | 2005-09-15 | Method for fabricating housing from austenitic steel. |
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EP (1) | EP1764422B1 (en) |
CN (1) | CN100519777C (en) |
DE (1) | DE502005004415D1 (en) |
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CN102443895A (en) * | 2011-09-26 | 2012-05-09 | 吴江伊兰吉纺织品有限公司 | Preparation method of novel wear-resistant steel wire ring |
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DE3314847A1 (en) * | 1983-04-23 | 1984-10-25 | VEB Federnwerk Zittau, DDR 8800 Zittau | Process for the fabrication of seamless rings having improved spring properties |
JPS62286610A (en) * | 1986-06-04 | 1987-12-12 | Sumitomo Metal Ind Ltd | Hot production of seamless steel pipe |
DE4124689A1 (en) * | 1991-07-22 | 1993-01-28 | Mannesmann Ag | Removing form errors and relieving adverse internal stresses in longitudinal seam welded pipes - by continuous expansion with internal expander plug and plug mandrel |
JP3177555B2 (en) * | 1993-08-18 | 2001-06-18 | 日本鋼管株式会社 | Method for producing stainless steel seamless steel pipe containing high Si with excellent corrosion resistance and ductility |
JPH0857505A (en) * | 1994-08-19 | 1996-03-05 | Sumitomo Metal Ind Ltd | Manufacturing method for austenitic stainless steel pipe |
JP4093006B2 (en) * | 2002-09-30 | 2008-05-28 | Jfeスチール株式会社 | Seamless steel pipe manufacturing method |
-
2005
- 2005-09-15 DE DE200550004415 patent/DE502005004415D1/en active Active
- 2005-09-15 EP EP20050020130 patent/EP1764422B1/en not_active Not-in-force
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2006
- 2006-09-15 CN CNB2006101729847A patent/CN100519777C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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EP1764422A1 (en) | 2007-03-21 |
CN100519777C (en) | 2009-07-29 |
DE502005004415D1 (en) | 2008-07-24 |
CN1974799A (en) | 2007-06-06 |
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