EP0070790A1 - Process for manufacturing hollow bodies for pressure containers from an aluminium alloy - Google Patents

Process for manufacturing hollow bodies for pressure containers from an aluminium alloy Download PDF

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Publication number
EP0070790A1
EP0070790A1 EP82420104A EP82420104A EP0070790A1 EP 0070790 A1 EP0070790 A1 EP 0070790A1 EP 82420104 A EP82420104 A EP 82420104A EP 82420104 A EP82420104 A EP 82420104A EP 0070790 A1 EP0070790 A1 EP 0070790A1
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Prior art keywords
case
hot
alloy
cold
hollow body
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EP82420104A
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German (de)
French (fr)
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EP0070790B1 (en
Inventor
Roger Develay
Marc Anagnostidis
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Metallurgigue de Gerzat
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Metallurgigue de Gerzat
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Priority to AT82420104T priority Critical patent/ATE10511T1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/24—Making hollow objects characterised by the use of the objects high-pressure containers, e.g. boilers, bottles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0646—Aluminium

Definitions

  • the present invention relates to a method of manufacturing pressurized hollow bodies such as tanks, bottles or the like, from aluminum alloys, type 7475 (according to the designation of the Aluminum Association) and have both a high resistance and a characteristic. high
  • the Applicant has found a manufacturing method which makes it possible to achieve the above-mentioned objectives, which are as follows:. mechanical resistance . corrosion under tension at 75% of guaranteed R 0.2 , i.e. 280 MPa: duration ⁇ 30 days in immersion-emersion (10 min-50 min) in a solution of 3.5% NaCl, at room temperature on C specimens under the conditions of standard ASTM 38-73. burst behavior under hydraulic pressure
  • the Fe content is preferably kept below 0.08%, and the Fe + Si content ⁇ 0.18%.
  • the pieces were spun by reverse spinning and hot drawn at 400 ° C + 10 ° C, then turned to 0 155 mm and annealed at 420 ° C, maintained for 4 hours. After pickling, they were cold drawn with an elongation (S-S) of 13.5% and cut to length. s
  • the open part of the case thus obtained is then warned at 400 ° C, then pierced and cut.
  • the bottle was finished by machining the neck and fitting the ring.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Extrusion Of Metal (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Forging (AREA)
  • Heat Treatment Of Steel (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Heat Treatment Of Nonferrous Metals Or Alloys (AREA)

Abstract

A hollow body from an aluminum alloy is prepared by a method of manufacturing a hollow body under pressure from an aluminum alloy, comprising the steps of: (1) preparing an alloy of a composition consisting of (by weight) 5.6</=Zn</=6.1, 2.0</=Mg</=2.4, 1.3</=Cu</=1.7, 0.15</=Cr</=0.25, Fe</=0.10, Fe+Si</=0.25, Mn</=0.04, Zr</=0.03, Ti</=0.04, with the remainder of the alloy being aluminum and impurities with the total amount of impurities being no more than 0.15 with the maximum amount of any given impurity being 0.05; (2) casting the alloy in the form of a billet; (3) hot extruding a billet at a temperature between 350 DEG and 450 DEG C. by the indirect process into the form of a case; (4) drawing out the resultant case hot then cold; (5) hot necking the drawn case between 350 DEG and 450 DEG C.; (6) solution annealing the hot necked case between 450 DEG and 490 DEG C. and quenching the case with water at a temperature below 40 DEG C.; and (7) two step tempering (type T73) the quenched case.

Description

La présente invention concerne une méthode de fabrication de corps creux sous pression tels que réservoirs, bouteilles ou autres, en alliages d'aluminium, type 7475 (selon la désignation de l'Aluminium Association) et présentent à la fois une haute résistance et une caracterisé élevésThe present invention relates to a method of manufacturing pressurized hollow bodies such as tanks, bottles or the like, from aluminum alloys, type 7475 (according to the designation of the Aluminum Association) and have both a high resistance and a characteristic. high

Jusqu'ici, les récipients sous pression très légers, en particulier ceux utilisés pour le transport et le stockage des gaz comprimés ou liquéfiés, ont été réalisés en alliage d'aluminium type 2001 (selon la désignation de l'Aluminium Association, édition du 1er Juin 1980). Or, si l'on veut obtenir avec cet alliage une excellente résistance à la corrosion sous tension (ce qui est fondamental pour des récipients sous pression), on est obligé d'utiliser un traitement thermique de revenu très poussé qui entraîne une diminution de la ténacité.So far, very light pressure vessels, in particular those used for the transport and storage of compressed or liquefied gases, have been made of aluminum alloy type 2001 (according to the designation of the Aluminum Association, edition of 1st June 1980). However, if one wants to obtain with this alloy an excellent resistance to corrosion under tension (which is fundamental for pressure vessels), one is obliged to use a very advanced heat treatment which results in a reduction in the tenacity.

En particulier, les allongements et la forme de la déchirure lors d'un essai d'éclatement sous pression hydraulique deviennent non conformes vis à vis des règlementations internationales en vigueur ou en préparation.In particular, the elongations and the shape of the tear during a burst test under hydraulic pressure become non-compliant with respect to the international regulations in force or in preparation.

Il était donc nécessaire de rechercher une méthode de fabrication de corps creux sous pression présentant les mêmes caractéristiques mécaniques (donc la même légèreté) et la même résistance à la corrosion sous tension (donc la même sécurité) que celles obtenues avec le 2001, et qui en plus, permettait de satisfaire les règlementations internationales au point de vue valeur des allongements et aspect de la déchirure lors d'un essai d'éclatement sous pression hydraulique.It was therefore necessary to search for a method of manufacturing hollow bodies under pressure having the same mechanical characteristics (therefore the same lightness) and the same resistance to corrosion under tension (therefore the same safety) as those obtained with the 2001, and which in addition, made it possible to satisfy international regulations from the point of view of the value of elongations and aspect of the tear during a burst test under hydraulic pressure.

La demanderesse a trouvé une méthode de fabrication permettant d'attein- dre les objectifs ci-dessus énoncés, et qui sont les suivants : . résistance mécanique

Figure imgb0001
Figure imgb0002
Figure imgb0003
. corrosion sous tension à 75% de R0,2 garanti, soit 280 MPa : durée ≥ 30 jours en immersion-émersion (10 min-50 min) dans une solution de NaCl à 3,5 %, à la température ambiante sur éprouvettes en C dans les conditions de la norme ASTM 38-73 . comportement à l'éclatement sous pression hydrauliqueThe Applicant has found a manufacturing method which makes it possible to achieve the above-mentioned objectives, which are as follows:. mechanical resistance
Figure imgb0001
Figure imgb0002
Figure imgb0003
 . corrosion under tension at 75% of guaranteed R 0.2 , i.e. 280 MPa: duration ≥ 30 days in immersion-emersion (10 min-50 min) in a solution of 3.5% NaCl, at room temperature on C specimens under the conditions of standard ASTM 38-73. burst behavior under hydraulic pressure

La déchirure "ductile" d'un corps de forme générale cylindrique doit satisfaire aux exigences suivantes :

  • - être longitudinale dans sa plus grande partie
  • - ne pas être ramifiée
  • - ne pas s'étendre de plus de 90° de part et d'autre de la partie principale de la déchirure
  • - ne pas s'étendre dans une partie du corps dont l'épaisseur dépasse 1,5 fois l'épaisseur maximale mesurée au milieu du corps
The "ductile" tear of a generally cylindrical body must meet the following requirements:
  • - be longitudinal for the most part
  • - not to be branched
  • - do not extend more than 90 ° on either side of the main part of the tear
  • - not to extend in a part of the body whose thickness exceeds 1.5 times the maximum thickness measured in the middle of the body

La méthode suivant l'invention consiste dans les étapes suivantes :

  • 1/ élaboration d'un alliage contenant (% en poids)
    Figure imgb0004
    Figure imgb0005
    Figure imgb0006
    Figure imgb0007
    Figure imgb0008
    Figure imgb0009
    Figure imgb0010
    Figure imgb0011
    Figure imgb0012
    Figure imgb0013
    Figure imgb0014
    Figure imgb0015
  • 2/ coulée de celui-ci sous forme de billettes
  • 3/ filage à chaud entre 350°C et 450°C par le procédé inverse sous forme d'un étui
  • 4/ étirage à chaud puis à froid de l'étui ainsi obtenu
  • 5/ ogivage à chaud entre 350°C et 450°C
  • 6/ mise en solution entre 450°C et 490°C, et trempe à l'eau à une température inférieure à 40°C
  • 7/ revenu double palier type T73
The method according to the invention consists of the following steps:
  • 1 / development of an alloy containing (% by weight)
    Figure imgb0004
    Figure imgb0005
    Figure imgb0006
    Figure imgb0007
    Figure imgb0008
    Figure imgb0009
    Figure imgb0010
    Figure imgb0011
    Figure imgb0012
    Figure imgb0013
    Figure imgb0014
    Figure imgb0015
  • 2 / casting of it in the form of billets
  • 3 / hot spinning between 350 ° C and 450 ° C by the reverse process in the form of a case
  • 4 / hot drawing then cold of the case thus obtained
  • 5 / hot icing between 350 ° C and 450 ° C
  • 6 / dissolving between 450 ° C and 490 ° C, and quenching with water at a temperature below 40 ° C
  • 7 / double stage income type T73

Il a été remarqué que les opérations 3/ et 4/ pouvaient être remplacées par une seule opération de filage à froid. Par ailleurs, la teneur en Fe est tenue, de préférence, en dessous de 0,08 %, et la teneur en Fe + Si ≤ 0,18 %.It was noted that operations 3 / and 4 / could be replaced created by a single cold spinning operation. Furthermore, the Fe content is preferably kept below 0.08%, and the Fe + Si content ≤ 0.18%.

Les exemples suivants illustrent les résultats obtenus en appliquant la méthode selon l'invention à la fabrication de bouteilles de 6 litres, de format φ 12 x 151 mm, dont la pression d'utilisation est de 30 MPa et la pression d'épreuve de 45 MPa. Les figures 1 à 3 représentent quelques aspects caractéristiques de déchirures consécutives à l'essai d'éclatement sous pression, les dimensions étant en mm.The following examples illustrate the results obtained by applying the method according to the invention to the manufacture of 6-liter bottles, format φ 12 x 151 mm, the working pressure of which is 30 MPa and the test pressure of 45 MPa. Figures 1 to 3 show some characteristic aspects of tears following the bursting test under pressure, the dimensions being in mm.

0n a élaboré 3 coulées : A (conforme à l'invention), B et C (hors du domaine de l'invention), dont les compositions sont les suivantes (% en poids).We have developed 3 flows: A (according to the invention), B and C (outside the scope of the invention), the compositions of which are as follows (% by weight).

Figure imgb0016
Celles-ci ont été coulées sous forme de billettes de φ 170 mm et ont été homogénéisées 12 heures à 465°C.
Figure imgb0016
 These were poured in the form of φ 170 mm billets and were homogenized for 12 hours at 465 ° C.

Après écroûtage à Ø 158,5 mm des lopins ont été filés par filage inverse et étirés à chaud à 400°C+ 10°C, puis tournés à 0 155 mm et recuits à 420°C, maintient 4 heures. Après décapage, ils ont été étirés à froid avec un allongement (S-S) de 13,5 % et mis à longueur. sAfter peeling at Ø 158.5 mm, the pieces were spun by reverse spinning and hot drawn at 400 ° C + 10 ° C, then turned to 0 155 mm and annealed at 420 ° C, maintained for 4 hours. After pickling, they were cold drawn with an elongation (S-S) of 13.5% and cut to length. s

La partie ouverte de l'étui ainsi obtenu est alors ogivée à 400°C, puis percée et coupée.The open part of the case thus obtained is then warned at 400 ° C, then pierced and cut.

Le traitement thermique subit a été le suivant :

  • - mise en solution à 465°C + 1,5°C, maintien 2 heures
  • - trempe. à l'eau froide (10 - 20°C)
  • - 1er revenu 6 heures à 105°C + 2°C
  • - 2ème revenu 12 heures à 177°C + 1,5 °C
The heat treatment undergone was as follows:
  • - dissolved at 465 ° C + 1.5 ° C, maintained for 2 hours
  • - hardening. with cold water (10 - 20 ° C)
  • - 1st income 6 hours at 105 ° C + 2 ° C
  • - 2nd 12 hour income at 177 ° C + 1.5 ° C

La bouteille a été terminée par un usinage du goulot et la pose de la bague.The bottle was finished by machining the neck and fitting the ring.

Une bouteille de chaque coulée a été soumise à des essais

  • - de traction : 4 éprouvettes en pleine épaisseur du corps de bouteille (sens long)
One bottle of each pour was tested
  • - traction: 4 test pieces in full thickness of the bottle body (long direction)

Deux bouteilles par coulée ont été soumises aux essais d'éclatement sous pression hydraulique.Two bottles per casting were subjected to bursting tests under hydraulic pressure.

Enfin, elles ont subi des essais de corrosion sous tension : aucune fissure n'est apparue sur les éprouvettes après 30 jours d'essai.Finally, they underwent stress corrosion tests: no cracks appeared on the test pieces after 30 days of testing.

Les résultats des essais mécaniques sont reportés au tableau I, étant entendu que tous les essais de corrosion sous tension ont donné d'excellents résultats avec, en plus, l'absence de piqûres et/ou de corrosion feuilletante.The results of the mechanical tests are reported in Table I, it being understood that all the stress corrosion tests have given excellent results with, in addition, the absence of pitting and / or flaky corrosion.

Ces essais montrent que pour obtenir les résultats désirés, toutes les étapes de la fabrication doivent être contrôlées suivant la méthode revendiquée.These tests show that in order to obtain the desired results, all the stages of manufacture must be checked according to the claimed method.

Ceci est particulièrement vrai en ce qui concerne la morphologie de la déchirure obtenue lors des essais d'éclatement hydraulique.

Figure imgb0017
This is particularly true with regard to the morphology of the tear obtained during the hydraulic burst tests.
Figure imgb0017

Claims (4)

1°/. Procédé d'obtention d'un corps creux sous pression en alliages d'Al présentant à la fois des caractéristiques mécaniques et une ductilité élevées, un comportement ductile lors d'un essai d'éclatement sous pression hydraulique interne et une bonne résistance à la corrosion sous tension, caractérisé en ce qu'il comprend essentiellement les opérations suivantes r 1 - élaboration d'un alliage contenant (Z en poids)
Figure imgb0018
Figure imgb0019
Figure imgb0020
Figure imgb0021
Figure imgb0022
Figure imgb0023
Figure imgb0024
Figure imgb0025
Figure imgb0026
Figure imgb0027
Figure imgb0028
Figure imgb0029
 2 - coulée de celui-ci sous forme de billettes 3 - filage à chaud entre 350°C et 450°C par le procédé inverse sous forme d'un étui 4 - étirage à chaud et à froid de l'étui ainsi obtenu 5 - ogivage à chaud entre 350°C et 450°C 6 - mise en solution.entre 450°C et 490°C et trempe à l'eau froide (température inférieure à 40°C) 7 - revenu double palier type T73 1 ° /. Method for obtaining a hollow body under pressure in Al alloys having both high mechanical properties and ductility, ductile behavior during a burst test under internal hydraulic pressure and good corrosion resistance under tension, characterized in that it essentially comprises the following operations r 1 - development of an alloy containing (Z by weight)
Figure imgb0018
Figure imgb0019
Figure imgb0020
Figure imgb0021
Figure imgb0022
Figure imgb0023
Figure imgb0024
Figure imgb0025
Figure imgb0026
Figure imgb0027
Figure imgb0028
Figure imgb0029
 2 - casting of it in the form of billets 3 - hot spinning between 350 ° C and 450 ° C by the reverse process in the form of a case 4 - hot and cold drawing of the case thus obtained 5 - hot icing between 350 ° C and 450 ° C 6 - dissolving between 450 ° C and 490 ° C and quenching with cold water (temperature below 40 ° C) 7 - double stage income type T73 2°/. Procédé selon la revendication 1, caractérisé en ce que la-teneur en Fe est inférieure ou égale à 0,08 %.2 ° /. Process according to Claim 1, characterized in that the Fe content is less than or equal to 0.08%. 3°/. Procédé selon la revendication 1 ou 2, caractérisé en ce que la teneur en Fe + Si est inférieure ou égale à 0,18 %.3 ° /. Process according to claim 1 or 2, characterized in that the content of Fe + Si is less than or equal to 0.18%. 4°/. Procédé selon les revendications 1 à 3, caractérisé en ce que les étapes 3 et 4 sont remplacées par un filage à froid.4 ° /. Method according to claims 1 to 3, characterized in that steps 3 and 4 are replaced by cold spinning.
EP82420104A 1981-07-22 1982-07-21 Process for manufacturing hollow bodies for pressure containers from an aluminium alloy Expired EP0070790B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82420104T ATE10511T1 (en) 1981-07-22 1982-07-21 PROCESS FOR THE MANUFACTURE OF HOLLOW BODY FOR PRESSURE TANKS MADE OF AN ALUMINUM ALLOY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114790A FR2510231A1 (en) 1981-07-22 1981-07-22 METHOD FOR MANUFACTURING HOLLOW BODIES UNDER PRESSURE OF ALUMINUM ALLOYS
FR8114790 1981-07-22

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EP0070790A1 true EP0070790A1 (en) 1983-01-26
EP0070790B1 EP0070790B1 (en) 1984-11-28

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US (1) US4439246A (en)
EP (1) EP0070790B1 (en)
JP (1) JPS5825463A (en)
AT (1) ATE10511T1 (en)
AU (1) AU551491B2 (en)
CA (1) CA1185879A (en)
DE (1) DE3261374D1 (en)
FR (1) FR2510231A1 (en)
HU (1) HU188982B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695942A1 (en) * 1992-09-22 1994-03-25 Gerzat Metallurg Aluminum alloy for hollow bodies under pressure.
WO1994024326A1 (en) * 1993-04-15 1994-10-27 Alcan International Limited Method of making hollow bodies
WO1996011759A1 (en) * 1994-10-13 1996-04-25 British Aluminium Holdings Limited Treating pressure vessels
US5766546A (en) * 1996-04-10 1998-06-16 Alusuisse Technology & Management Ltd. High internal pressure forming of aluminum alloy hollow bodies
FR2819576A1 (en) * 2001-01-16 2002-07-19 Gerzat Metallurg Bottle for gas under pressure incorporating two cylindrical compartments arranged around a common axis with a common separation back

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN103949861A (en) * 2014-05-05 2014-07-30 南京国祺新能源设备有限公司 Preparation method for dry method revolving furnace pipe in nuclear energy industry
CN110885942B (en) * 2019-12-17 2021-05-07 中铝材料应用研究院有限公司 Medium-strength 7xxx series aluminum alloy plate suitable for hot stamping forming-quenching integrated process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163281A5 (en) * 1972-12-28 1973-07-20 Aluminum Co Of America Aluminium base alloy sheet or plate - which is resistant to tearing
FR2227342A1 (en) * 1973-04-30 1974-11-22 Martin Marietta Aluminium Inc Treating double necked metal containers - e.g. gas bottles with high fracture resistance
FR2238892A1 (en) * 1973-07-25 1975-02-21 Gerzat Metallurg
US3984259A (en) * 1975-08-22 1976-10-05 Aluminum Company Of America Aluminum cartridge case

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB711859A (en) * 1950-07-03 1954-07-14 Aluminum Co Of America Improvements in or relating to process of producing aluminous metal extrusions
US3469433A (en) * 1965-06-04 1969-09-30 Eugene E Fresch Metal-working process
US3847681A (en) * 1973-11-09 1974-11-12 Us Army Processes for the fabrication of 7000 series aluminum alloys
US4305763A (en) * 1978-09-29 1981-12-15 The Boeing Company Method of producing an aluminum alloy product

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163281A5 (en) * 1972-12-28 1973-07-20 Aluminum Co Of America Aluminium base alloy sheet or plate - which is resistant to tearing
FR2227342A1 (en) * 1973-04-30 1974-11-22 Martin Marietta Aluminium Inc Treating double necked metal containers - e.g. gas bottles with high fracture resistance
FR2238892A1 (en) * 1973-07-25 1975-02-21 Gerzat Metallurg
US3984259A (en) * 1975-08-22 1976-10-05 Aluminum Company Of America Aluminum cartridge case

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695942A1 (en) * 1992-09-22 1994-03-25 Gerzat Metallurg Aluminum alloy for hollow bodies under pressure.
EP0589807A1 (en) * 1992-09-22 1994-03-30 Société Métallurgique de Gerzat Aluminium alloy for pressurised hollow bodies
WO1994024326A1 (en) * 1993-04-15 1994-10-27 Alcan International Limited Method of making hollow bodies
US5932037A (en) * 1993-04-15 1999-08-03 Luxfer Group Limited Method of making hollow bodies
WO1996011759A1 (en) * 1994-10-13 1996-04-25 British Aluminium Holdings Limited Treating pressure vessels
US6491182B1 (en) 1994-10-13 2002-12-10 Luxfer Group Limited Treating pressure vessels
US5766546A (en) * 1996-04-10 1998-06-16 Alusuisse Technology & Management Ltd. High internal pressure forming of aluminum alloy hollow bodies
FR2819576A1 (en) * 2001-01-16 2002-07-19 Gerzat Metallurg Bottle for gas under pressure incorporating two cylindrical compartments arranged around a common axis with a common separation back

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US4439246A (en) 1984-03-27
AU551491B2 (en) 1986-05-01
JPS5825463A (en) 1983-02-15
HU188982B (en) 1986-05-28
CA1185879A (en) 1985-04-23
ATE10511T1 (en) 1984-12-15
EP0070790B1 (en) 1984-11-28
FR2510231A1 (en) 1983-01-28
DE3261374D1 (en) 1985-01-10
FR2510231B1 (en) 1983-11-10
AU8624182A (en) 1983-01-27

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