EP0303016B1 - Method of making a gas pressure vessel of austenitic stainless steel by cryogenic forming - Google Patents

Method of making a gas pressure vessel of austenitic stainless steel by cryogenic forming Download PDF

Info

Publication number
EP0303016B1
EP0303016B1 EP88109402A EP88109402A EP0303016B1 EP 0303016 B1 EP0303016 B1 EP 0303016B1 EP 88109402 A EP88109402 A EP 88109402A EP 88109402 A EP88109402 A EP 88109402A EP 0303016 B1 EP0303016 B1 EP 0303016B1
Authority
EP
European Patent Office
Prior art keywords
container
making
stainless steel
gas pressure
pressure vessel
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
Application number
EP88109402A
Other languages
German (de)
French (fr)
Other versions
EP0303016A1 (en
Inventor
Werner Konrad Diehl
Martin Dr. Kesten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT88109402T priority Critical patent/ATE68527T1/en
Publication of EP0303016A1 publication Critical patent/EP0303016A1/en
Application granted granted Critical
Publication of EP0303016B1 publication Critical patent/EP0303016B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/049—Deforming bodies having a closed end
    • 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

Definitions

  • the invention relates to a method for producing a pressurized gas container from austenitic steels by cryoforming according to the preamble of claim 1.
  • the strength properties of metastable austenitic steels can be improved by cryoforming by deforming them below their respective martensite transformation temperatures Md or Ms.
  • Md is the temperature above which no martensitic transformation takes place even when deformed
  • Ms is the temperature below which martensite formation begins even without deformation.
  • the preferred coolant used is liquid nitrogen, with which the steels, if desired, can be cooled down to -196 ° C.
  • DE-OS 1 452 533 also discloses the use of this method for producing high-strength pressure vessels.
  • the simultaneous use of liquid nitrogen as the coolant and pressure medium is preferred.
  • the container to be deformed is filled with liquid nitrogen and brought to the high pressure required for the deformation by means of an appropriate cryopump or by injecting a gas.
  • the use of a pressure medium different from the coolant is also mentioned, but appears to be too complex, for example in the form of explosion deformation, or undesirable condensations from the pressure medium are to be expected, possibly freezing the pressure medium with excessive cold removal from the container wall.
  • the invention is therefore based on the object of improving the process for producing pressurized gas containers from austenitic steels by cryogenic shaping in such a way that it does not have the disadvantages mentioned when the coolant is simultaneously used as the pressurizing medium, nor does the difficulties described when using its own pressurizing medium occur.
  • the trichlorofluoromethane CFCl3 used according to the invention which is known as a refrigerant under the designation R11, has properties that enable its use as a separate pressure medium that is independent of the coolant, although this is not actually to be expected due to the temperature range in which it is present as a liquid is.
  • Trichlorofluoromethane solidifies at a temperature which, because of the expedient use of liquid nitrogen as the coolant, is significantly above the temperature at which the cryogenic stretching is carried out.
  • the drawing illustrates a device for carrying out the method according to the invention in schematic form.
  • the compressed gas container 1 to be deformed is located in an insulated cooling chamber 2, in which it is cooled to the temperature required for the formation of martensite.
  • Liquid nitrogen which flows through the line 3 and nozzles 4 into the cooling chamber 2, serves as the coolant is sprayed where it evaporates.
  • the temperature reached is indicated by the thermometer 5.
  • CFCl3 as a pressure medium, which is removed from a reservoir 6 and pressed by means of the pump 7 via the line 8 into the interior of the container 1.
  • the pressure is indicated by the manometer 9.
  • the filled pressurized gas container 1 is closed with a releasable, pressure-tight closure 10 and connected to the pump 7 and the line 8 via a filling pipe 11 which extends into the middle of the container.
  • the filling pipe 11 has thermal insulation 12 which prevents the pressure medium from freezing.
  • CFCl3 has a significantly lower thermal conductivity than the container steel, only an edge layer that comes into direct contact with the inner surface of the container can solidify during the deformation process. It is therefore also possible to replace the cooling chamber 2 with a Dewar vessel filled with liquid nitrogen, into which the container 1 is immersed.
  • the process according to the invention can be carried out even under these extreme conditions, provided that care is taken that the container 1 is not immersed in the liquid nitrogen for longer than the time required for the deformation.

Abstract

The invention relates to a process for producing a compressed gas container made of austenitic steels by cryodeformation in which the container is cooled by a refrigerated cooling medium to below the prevailing martensite transformation temperature and is expanded to the desired size by the introduction of a pressure medium into the container. Trichlorofluoromethane is employed as the pressure medium.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Druckgasbehälters aus austenitischen Stählen durch Kryoverformung nach dem Oberbegriff des Anspruches 1.The invention relates to a method for producing a pressurized gas container from austenitic steels by cryoforming according to the preamble of claim 1.

Die Festigkeitseigenschaften metastabiler austenitischer Stähle können durch Kryoverformung verbessert werden, indem sie unterhalb ihrer jeweiligen Martensitumwandlungstemperatur Md oder Ms verformt werden. Md ist dabei die Temperatur, oberhalb der auch bei Verformung keine martensitische Umwandlung stattfindet, Ms ist dagegen die Temperatur, unterhalb der auch ohne Verformung die Martensitbildung einsetzt. Ein derartiges Verfahren zur Verbesserung der Festigkeitseigenschaften austenitischer Stähle ist aus der DE-PS 26 54 702 bekannt.The strength properties of metastable austenitic steels can be improved by cryoforming by deforming them below their respective martensite transformation temperatures Md or Ms. Md is the temperature above which no martensitic transformation takes place even when deformed, while Ms is the temperature below which martensite formation begins even without deformation. Such a method for improving the strength properties of austenitic steels is known from DE-PS 26 54 702.

Da insbesondere die Ms-Temperaturen sehr niedrig liegen, verwendet man als Kühlmittel bevorzugt flüssigen Stickstoff, mit dem die Stähle, falls gewüschnt, bis auf -196°C abgekühlt werden können.Since the Ms temperatures in particular are very low, the preferred coolant used is liquid nitrogen, with which the steels, if desired, can be cooled down to -196 ° C.

Aus der DE-OS 1 452 533 ist ferner die Anwendung dieses Verfahrens zur Herstellung hochfester Druckbehälter bekannt. Bevorzugt wird hierbei die gleichzeitige Verwendung von flüssigem Stickstoff als Kühlmittel und Druckmittel. In diesem Fall wird der zu verformende Behälter mit flüssigem Stickstoff gefüllt und mit Hilfe einer entsprechenden Kryopumpe oder durch Aufdrücken eines Gases auf den für die Verformung erforderlichen hohen Druck gebracht. Die Verwendung eines vom Kühlmittel unterschiedlichen Druckmittels wird ebenfalls genannt, erscheint jedoch zu aufwendig, beispielsweise in Form von Explosionsverformung, oder es sind unerwünschte Kondensationen aus dem Druckmittel zu erwarten, ggf. Einfrieren des Druckmittels mit übermäßigem Kälteentzug aus der Behälterwand.DE-OS 1 452 533 also discloses the use of this method for producing high-strength pressure vessels. The simultaneous use of liquid nitrogen as the coolant and pressure medium is preferred. In this case, the container to be deformed is filled with liquid nitrogen and brought to the high pressure required for the deformation by means of an appropriate cryopump or by injecting a gas. The use of a pressure medium different from the coolant is also mentioned, but appears to be too complex, for example in the form of explosion deformation, or undesirable condensations from the pressure medium are to be expected, possibly freezing the pressure medium with excessive cold removal from the container wall.

In der Praxis hat sich jedoch bei der gleichzeitigen Verwendung von flüssigem Stickstoff als Kühl- und Druckmittel eine Reihe von Nachteilen und Schwierigkeiten herausgestellt.In practice, however, a number of disadvantages and difficulties have emerged when liquid nitrogen is used simultaneously as a coolant and pressure medium.

Wenn die Druckübertragung auf die Behälterwand über den flüssigen Stickstoff als Medium erfolgt, erfordert dies die Verwendung aufwendiger, wärmeisolierter Einrichtungen wie Kryopumpen, isolierten Rohrleitungen und Kryobehältern. Bewußt erzeugte oder unvermeidlich entstehende Gaspolster im Behälter oder seinen Zuleitungen erhöhen das Sicherheitsrisiko bei einem eventuellen Versagen des Behälters während des Kryostreckprozesses. Dazu kommt, daß auch der flüssige Stickstoff bei den relativ hohen erforderlichen Streckdrücken (einige 100 bar) selbst eine merkliche Kompressibilität besitzt, was die bei einem Versagen freigesetzte Energie deutlich erhöht. Deswegen sind für das Kryostrecken aufwendige und die technische Anwendung des Verfahrens behindernde Sicherheitseinrichtungen erforderlich.If the pressure is transferred to the container wall via the liquid nitrogen as a medium, this requires the use of complex, heat-insulated devices such as cryopumps, insulated pipelines and cryogenic containers. Deliberately created or inevitably created gas cushions in the container or its supply lines increase the safety risk in the event of a possible failure of the container during the cryostressing process. In addition, the liquid nitrogen at the relatively high required Stretching pressures (some 100 bar) itself have a noticeable compressibility, which significantly increases the energy released in the event of failure. For this reason, complex safety devices are required for cryogenic stretching and hinder the technical application of the method.

Der Erfindung liegt daher die Aufgabe zugrunde, das Verfahren zur Herstellung von Druckgasbehältern aus austenitischen Stählen durch Kryoverformung so zu verbessern, daß es weder die bei gleichzeitiger Verwendung des Kühlmittels als Druckmittel genannten Nachteile aufweist, noch die bei Verwendung eines eigenen Druckmittels beschriebenen Schwierigkeiten auftreten.The invention is therefore based on the object of improving the process for producing pressurized gas containers from austenitic steels by cryogenic shaping in such a way that it does not have the disadvantages mentioned when the coolant is simultaneously used as the pressurizing medium, nor does the difficulties described when using its own pressurizing medium occur.

Ausgehend von dem im Oberbegriff des Anspruches 1 berücksichtigten Stand der Technik ist diese Aufgabe erfindungsgemäß gelöst mit den im kennzeichnenden Teil des Anspruches 1 angegebenen Merkmalen.Starting from the prior art taken into account in the preamble of claim 1, this object is achieved according to the invention with the features specified in the characterizing part of claim 1.

Eine vorteilhafte Weiterbildung der Erfindung ist im Unteranspruch angegeben.An advantageous development of the invention is specified in the subclaim.

Das gemäß der Erfindung verwendete Trichlorfluormethan CFCl₃, welches als Kältemittel unter der Bezeichnung R11 bekannt ist, besitzt Eigenschaften, die seinen Einsatz als separates, vom Kühlmittel unabhängiges Druckmittel ermöglichen, obwohl dies aufgrund des Temperaturbereiches, in dem es als Flüssigkeit vorliegt, eigentlich nicht zu erwarten ist.The trichlorofluoromethane CFCl₃ used according to the invention, which is known as a refrigerant under the designation R11, has properties that enable its use as a separate pressure medium that is independent of the coolant, although this is not actually to be expected due to the temperature range in which it is present as a liquid is.

Trichlorfluormethan erstarrt bei einer Temperatur, die wegen der zweckmäßigen Verwendung von flüssigem Stickstoff als Kühlmittel deutlich über der Temperatur liegt, bei der das Kryostrecken durchgeführt wird.Trichlorofluoromethane solidifies at a temperature which, because of the expedient use of liquid nitrogen as the coolant, is significantly above the temperature at which the cryogenic stretching is carried out.

Bei Raumtemperatur ist es flüssig, so daß es mit einer normalen hydraulischen Pumpe in den zu verformenden Behälter gepreßt werden kann. Daß es diesen Aggregatzustand während des Kryostreckvorganges beibehalten kann, obwohl der zu verformende Behälter von außen mit flüssigem Stickstoff gekühlt wird, verdankt es seiner, im Vergleich zum Stahl, geringen Wärmeleitfähigkeit und großen spezifischen Wärme.
λ Stahl (-196 °C) ∼ 6 [W/mK];λ CFCL₃(-120 °C)<O.2 [W/mK]
cp Stahl (-196 °C)=0.15 [J/gk];cp CFCl₃(-120 °C)=0.79[J/gK]
   Durch diese Eigenschaften wird ein schneller Temperaturausgleich zwischen der von außen gekühlten Behälterwand und dem Druckmedium im Behälter verhindert.It is liquid at room temperature so that it can be pressed into the container to be deformed using a normal hydraulic pump. The fact that it can maintain this state of matter during the cryostressing process, even though the container to be deformed is cooled from the outside with liquid nitrogen, is due to its low thermal conductivity and high specific heat compared to steel.
λ steel (-196 ° C) ∼ 6 [W / mK]; λ CFCL₃ (-120 ° C) <O.2 [W / mK]
cp steel (-196 ° C) = 0.15 [J / gk]; cp CFCl₃ (-120 ° C ) = 0.79 [J / gK]
These properties prevent rapid temperature compensation between the externally cooled container wall and the pressure medium in the container.

Die Zeichnung veranschaulicht als Ausführungsbeispiel eine Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens in schematischer Form.As an exemplary embodiment, the drawing illustrates a device for carrying out the method according to the invention in schematic form.

Der zu verformende Druckgasbehälter 1 befindet sich in einer isolierten Kühlkammer 2, in welcher er auf die für die Martensitbildung erforderliche Temperatur abgekühlt wird. Als Kühlmittel dient flüssiger Stickstoff, der durch die Leitung 3 und Düsen 4 in die Kühlkammer 2 eingesprüht wird, wo er verdampft. Die erreichte Temperatur wird durch das Thermometer 5 angezeigt. Erfindungsgemäß wird der erforderliche Verformungsdruck mit CFCl₃ als Druckmittel aufgebracht, welches einem Reservoir 6 entnommen und mittels der Pumpe 7 über die Leitung 8 in das Innere des Behälters 1 gedrückt wird. Der Druck wird durch das Manometer 9 angezeigt.The compressed gas container 1 to be deformed is located in an insulated cooling chamber 2, in which it is cooled to the temperature required for the formation of martensite. Liquid nitrogen, which flows through the line 3 and nozzles 4 into the cooling chamber 2, serves as the coolant is sprayed where it evaporates. The temperature reached is indicated by the thermometer 5. According to the required deformation pressure is applied with CFCl₃ as a pressure medium, which is removed from a reservoir 6 and pressed by means of the pump 7 via the line 8 into the interior of the container 1. The pressure is indicated by the manometer 9.

Der gefüllte Druckgasbehälter 1 ist mit einem lösbaren, druckdichten Verschluß 10 verschlossen und über eine bis in die Behältermitte ragendes Füllrohr 11 mit der Pumpe 7 und der Leitung 8 verbunden. Am Eintritt in den Druckgasbehälter 1 besitzt das Füllrohr 11 eine thermische Isolierung 12, die ein Einfrieren des Druckmittels verhindert. Die für die Durchführung des erfindungsgemäßen Verfahrens erforderlichen Sicherheitsvorkehrungen gehen über das bei routinemäßig durchgeführten Wasserdruckprüfungen von Behältern übliche Maß nicht hinaus.The filled pressurized gas container 1 is closed with a releasable, pressure-tight closure 10 and connected to the pump 7 and the line 8 via a filling pipe 11 which extends into the middle of the container. At the entry into the compressed gas container 1, the filling pipe 11 has thermal insulation 12 which prevents the pressure medium from freezing. The safety precautions required to carry out the method according to the invention do not go beyond what is customary in the routine water pressure tests of containers.

Da CFCl₃ eine deutlich geringere Wärmeleitfähigkeit als der Behälterstahl besitzt, kann während des Verformungsprozesses nur eine mit der Behälterinnenoberfläche unmittelbar in Berührung kommende Randschicht erstarren. Es ist daher auch möglich, die Kühlkammer 2 durch ein mit flüssigem Stickstoff gefülltes Dewargefäß zu ersetzen, in welches der Behälter 1 eintaucht. Das erfindungsgemäße Verfahren kann selbst unter diesen extremen Bedingungen durchgeführt werden, sofern man darauf achtet, daß der Behälter 1 nicht länger als während der für die Verformung erforderlichen Zeit in den flüssigen Stickstoff eintaucht.Since CFCl₃ has a significantly lower thermal conductivity than the container steel, only an edge layer that comes into direct contact with the inner surface of the container can solidify during the deformation process. It is therefore also possible to replace the cooling chamber 2 with a Dewar vessel filled with liquid nitrogen, into which the container 1 is immersed. The process according to the invention can be carried out even under these extreme conditions, provided that care is taken that the container 1 is not immersed in the liquid nitrogen for longer than the time required for the deformation.

Claims (2)

  1. Process for the production of a pressurised gas vessel (1) from austenitic steels by cryoforming, in which process the pressurised gas vessel is cooled by means of a low-temperature coolant to below the particular martensite transition temperature (Md; Ms) and widened to the desired size by passing a pressurising agent into the interior of the vessel, characterised in that the pressurising agent used is trichlorofluoromethane (CFCl₃).
  2. Process according to Claim 1, characterised in that the cooling is effected by nitrogen.
EP88109402A 1987-08-13 1988-06-14 Method of making a gas pressure vessel of austenitic stainless steel by cryogenic forming Expired - Lifetime EP0303016B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88109402T ATE68527T1 (en) 1987-08-13 1988-06-14 PROCESS FOR THE MANUFACTURE OF A COMPRESSED GAS TANK FROM AUSTENITIC STEELS BY CRYEOFORMING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3726960 1987-08-13
DE19873726960 DE3726960A1 (en) 1987-08-13 1987-08-13 METHOD FOR PRODUCING A COMPRESSED GAS CONTAINER FROM AUSTENITIC STEELS BY CRYFORMING

Publications (2)

Publication Number Publication Date
EP0303016A1 EP0303016A1 (en) 1989-02-15
EP0303016B1 true EP0303016B1 (en) 1991-10-16

Family

ID=6333652

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109402A Expired - Lifetime EP0303016B1 (en) 1987-08-13 1988-06-14 Method of making a gas pressure vessel of austenitic stainless steel by cryogenic forming

Country Status (5)

Country Link
US (1) US4846900A (en)
EP (1) EP0303016B1 (en)
JP (1) JPS6465230A (en)
AT (1) ATE68527T1 (en)
DE (1) DE3726960A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63143208A (en) * 1986-12-06 1988-06-15 Nippon Piston Ring Co Ltd Production of iron sintered parts
DE19645442A1 (en) * 1996-11-04 1998-05-14 Messer Griesheim Gmbh Compound container for gases
JP2009012886A (en) * 2007-07-02 2009-01-22 Ricoh Co Ltd Sheet stacking device and automatic document carrying device
DE102011105423B4 (en) * 2011-06-22 2013-04-04 Mt Aerospace Ag Pressure vessel for receiving and storing cryogenic fluids, in particular cryogenic fluids, and method for its production and its use
DE102011105426B4 (en) 2011-06-22 2013-03-28 Mt Aerospace Ag Pressure vessel for receiving and storing cryogenic fluids, in particular cryogenic fluids, and method for its production and its use
DE102017204240A1 (en) * 2017-03-14 2018-09-20 Robert Bosch Gmbh Fuel tank for a fuel cell system and method of manufacturing a fuel tank
CN109500195B (en) * 2018-11-19 2019-11-29 大连理工大学 A kind of special tubes and pipes of aluminium alloy part ultralow temperature pressure medium manufacturing process
CN113106207B (en) * 2021-04-20 2022-09-02 吉安锐迈管道配件有限公司 Quenching cooling device and process for ultralow-temperature 9Ni steel heat treatment

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1452533A1 (en) * 1962-03-28 1969-02-20 Arde Portland Inc Process for the production of pressure vessels with high tensile strength and device for carrying out the process
FR1333779A (en) * 1962-05-11 1963-08-02 Improvement in the forming processes of metal expansion bellows
GB964929A (en) * 1962-06-21 1964-07-29 Bristol Aerojet Ltd Improvements relating to the treatments of metals
US3255051A (en) * 1962-07-25 1966-06-07 Aerojet General Co Method for strengthening iron base alloys
US4042421A (en) * 1975-12-03 1977-08-16 Union Carbide Corporation Method for providing strong tough metal alloys
DE3608563A1 (en) * 1986-03-14 1987-09-17 Messer Griesheim Gmbh METHOD FOR REDUCING THE HEAT CONDUCTIVITY OF WORKPIECES MADE OF AUSTENITIC STEEL
DE3614290A1 (en) * 1986-04-26 1987-10-29 Messer Griesheim Gmbh COMPRESSED GAS TANKS FROM AN AUSTENITIC STEEL ALLOY

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
INDUSTRIE-ANZEIGER Band 96, nR. 78, 20. september 1974, seite 1807. Essen; "Kältebehandlung von Stahl" *

Also Published As

Publication number Publication date
ATE68527T1 (en) 1991-11-15
JPS6465230A (en) 1989-03-10
EP0303016A1 (en) 1989-02-15
DE3726960A1 (en) 1989-02-23
US4846900A (en) 1989-07-11

Similar Documents

Publication Publication Date Title
EP0303016B1 (en) Method of making a gas pressure vessel of austenitic stainless steel by cryogenic forming
EP1680620B1 (en) Method for filling a pressure vessel with gas
DE3614290C2 (en)
WO2005059431A1 (en) Method for filling compressed-gas containers
EP1076794B1 (en) Method for storing low-boiling permanent gases or gas mixtures in pressurised containers
EP1381807B1 (en) Pressure container
US3197851A (en) Method of forming a high tensile stength pressure vessel
EP0840054B1 (en) Composite container for gases
DE102006051880A1 (en) Method for cooling superconducting magnets
EP0218973B1 (en) Method and device for the temporary sealing of large pipe lines
DE10160275B4 (en) Cutting food with LPG
DD210175A3 (en) PROCESS FOR FILLING AND / OR REMOVING LIQUID GAS FROM PACKAGING
DE2929695A1 (en) HOT ISOSTATIC PRESS
DE605566C (en) Process for the production of the reinforced transition points between spherical zones in hollow bodies in spherical rod form
DE4234438C1 (en) Process for oxy-fuel cutting with liquid oxygen
DE547266C (en) Process for the production of solid carbonic acid in the form of blocks
DE19907018A1 (en) Deforming process for hollow bodies made of metal, involving warming hollow body, sealing one end, removing air and introducing pressurizing gas
DE891355C (en) Pressure cooker with liquid filling for sterilizing filled cans
AT216304B (en) Process for the production of strand-like material, in particular seamless tubes, and device for carrying out the process
DE2047363A1 (en) Evaporated liquefied gas blanket - is utilised by feeding it directly to gas bottles
DE102004035319A1 (en) Cryo tank structure for motor vehicle has heat conducting connection between inner and outer tanks, and in which para-ortho catalyst is provided
DE102006025721A1 (en) Filling a pressure vessel with gas, especially for an automobile airbag system, comprises charging the vessel with cold gas in liquid, solid or gaseous form, sealing the vessel and heating the contents of the vessel
DE718831C (en) Device for filling liquid carbonic acid produced from solid carbonic acid
DE620784C (en) Method and device for vulcanizing hoses or the like made of rubber
EP1206662B1 (en) Diver tank and method for the production thereof

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT FR GB IT

17P Request for examination filed

Effective date: 19890728

17Q First examination report despatched

Effective date: 19901220

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT FR GB IT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19911016

Ref country code: GB

Effective date: 19911016

Ref country code: FR

Effective date: 19911016

REF Corresponds to:

Ref document number: 68527

Country of ref document: AT

Date of ref document: 19911115

Kind code of ref document: T

EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19920614

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed