Gas cylinders - Refillable seamless aluminium alloy gas cylinders - Design, construction and testing (ISO 7866:2012)

ISO 7866:2012 specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes and tests at time of manufacture of refillable seamless aluminium alloy gas cylinders of water capacities up to and including 150 litres for compressed, liquefied and dissolved gases for worldwide use (normally up to +65 °C).

Gasflaschen - Wiederbefüllbare nahtlose Gasflaschen aus Aluminiumlegierungen - Auslegung, Bau und Prüfung (ISO 7866:2012)

Diese Internationale Norm legt Mindestanforderungen an Werkstoff, Auslegung, Bau und Ausführung, Herstellungsverfahren und Prüfungen zum Zeitpunkt der Herstellung von wiederbefüllbaren nahtlosen Gasflaschen aus Aluminiumlegierungen mit einem Fassungsraum bis einschließlich 150 Liter für verdichtete, verflüssigte und gelöste Gase (im Allgemeinen bis +65 °C) für die weltweite Verwendung fest.

Bouteilles à gaz - Bouteilles à gaz sans soudure en alliage d'aluminium destinées à être rechargées - Conception, construction et essais (ISO 7866:2012)

L'ISO 7866:2012 spécifie les exigences minimales relatives au matériau, à la conception, à la construction et à l'exécution, aux modes de fabrication et aux essais au moment de la fabrication des bouteilles à gaz rechargeables sans soudure, en alliage d'aluminium, d'une contenance en eau inférieure ou égale à 150 litres, pour gaz comprimés, liquéfiés ou dissous, pour usage international (normalement jusqu'à + 65 °C).

Plinske jeklenke - Ponovno polnljive plinske jeklenke iz celega iz aluminijevih zlitin - Konstruiranje, izdelava in preskušanje (ISO 7866:2012)

Ta mednarodni standard določa minimalne zahteve za material, obliko, konstruiranje in izdelavo, postopke izdelave in preskuse ob času izdelave ponovno polnljivih plinskih jeklenk iz celega iz aluminijeve zlitine s prostornino do vključno 150 litrov stisnjenega, tekočega ali raztopljenega plina za uporabo po vsem svetu (običajno do –65 °C).

General Information

Status
Withdrawn
Publication Date
30-Dec-2012
Withdrawal Date
30-Mar-2013
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
01-Sep-2012
Completion Date
01-Sep-2012

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SLOVENSKI STANDARD
SIST EN ISO 7866:2012
01-december-2012
1DGRPHãþD
SIST EN 1975:1999
SIST EN 1975:1999/A1:2004
SIST EN 1975:1999/AC:2000

Plinske jeklenke - Ponovno polnljive plinske jeklenke iz celega iz aluminijevih zlitin

- Konstruiranje, izdelava in preskušanje (ISO 7866:2012)

Gas cylinders - Refillable seamless aluminium alloy gas cylinders - Design, construction

and testing (ISO 7866:2012)
Gasflaschen - Wiederbefüllbare nahtlose Gasflaschen aus Aluminiumlegierungen -
Auslegung, Bau und Prüfung (ISO 7866:2012)

Bouteilles à gaz - Bouteilles à gaz sans soudure en alliage d'aluminium destinées à être

rechargées - Conception, construction et essais (ISO 7866:2012)
Ta slovenski standard je istoveten z: EN ISO 7866:2012
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
77.150.10 Aluminijski izdelki Aluminium products
SIST EN ISO 7866:2012 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 7866:2012
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SIST EN ISO 7866:2012
EUROPEAN STANDARD
EN ISO 7866
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2012
ICS 23.020.30 Supersedes EN 1975:1999
English Version
Gas cylinders - Refillable seamless aluminium alloy gas
cylinders - Design, construction and testing (ISO 7866:2012)

Bouteilles à gaz - Bouteilles à gaz sans soudure en alliage Gasflaschen - Wiederbefüllbare nahtlose Gasflaschen aus

d'aluminium destinées à être rechargées - Conception, Aluminiumlegierungen - Auslegung, Bau und Prüfung (ISO

construction et essais (ISO 7866:2012) 7866:2012)
This European Standard was approved by CEN on 4 August 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7866:2012: E

worldwide for CEN national Members.
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SIST EN ISO 7866:2012
EN ISO 7866:2012 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 7866:2012
EN ISO 7866:2012 (E)
Foreword

This document (EN ISO 7866:2012) has been prepared by Technical Committee ISO/TC 58 "Gas cylinders" in

collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the secretariat of which is

held by BSI.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by March 2013, and conflicting national standards shall be withdrawn at

the latest by March 2013.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1975:1999.

According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 7866:2012 has been approved by CEN as a EN ISO 7866:2012 without any modification.

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SIST EN ISO 7866:2012
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SIST EN ISO 7866:2012
INTERNATIONAL ISO
STANDARD 7866
Second edition
2012-09-01
Gas cylinders — Refillable seamless
aluminium alloy gas cylinders — Design,
construction and testing
Bouteilles à gaz — Bouteilles à gaz sans soudure en alliage
d'aluminium destinées à être rechargées — Conception, construction et
essais
Reference number
ISO 7866:2012(E)
ISO 2012
---------------------- Page: 7 ----------------------
SIST EN ISO 7866:2012
ISO 7866:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved
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SIST EN ISO 7866:2012
ISO 7866:2012(E)
Contents Page

Foreword ............................................................................................................................................................. v

Introduction ........................................................................................................................................................ vi

1  Scope ...................................................................................................................................................... 1

2  Normative references ............................................................................................................................ 1

3  Terms and definitions ........................................................................................................................... 1

4  Symbols .................................................................................................................................................. 2

5  Inspection and testing .......................................................................................................................... 4

6  Materials ................................................................................................................................................. 4

6.1  General requirements ........................................................................................................................... 4

6.2  Thermal treatments ............................................................................................................................... 5

6.3  Test requirements ................................................................................................................................. 6

6.4  Failure to meet test requirements ........................................................................................................ 6

7  Design ..................................................................................................................................................... 7

7.1  General requirements ........................................................................................................................... 7

7.2  Calculation of cylindrical shell thickness ........................................................................................... 7

7.3  Design of ends (heads and bases) ...................................................................................................... 7

7.4  Neck design ........................................................................................................................................... 8

7.5  Foot rings ............................................................................................................................................. 11

7.6  Neck rings ............................................................................................................................................ 11

7.7  Design drawing .................................................................................................................................... 11

7.8  High-strength and/or low-elongation gas cylinder designs ............................................................ 11

8  Construction and workmanship ........................................................................................................ 11

8.1  General ................................................................................................................................................. 11

8.2  End forming ......................................................................................................................................... 11

8.3  Wall thickness ...................................................................................................................................... 12

8.4  Surface imperfections and defects .................................................................................................... 12

8.5  Neck threads ........................................................................................................................................ 12

8.6  Out-of-roundness ................................................................................................................................ 12

8.7  Exposure to heat ................................................................................................................................. 13

8.8  Straightness ......................................................................................................................................... 13

8.9  Mean diameter ..................................................................................................................................... 13

9  Type approval procedure.................................................................................................................... 13

9.1  General requirements ......................................................................................................................... 13

9.2  Prototype tests .................................................................................................................................... 14

9.3  Type approval certificate .................................................................................................................... 15

10  Batch tests ........................................................................................................................................... 15

10.1  General requirements ......................................................................................................................... 15

10.2  Tensile test ........................................................................................................................................... 17

10.3  Bend test and flattening test .............................................................................................................. 18

10.4  Hydraulic burst test ............................................................................................................................. 19

10.5  Test requirements for high-strength and/or low-elongation gas cylinder designs ...................... 21

11  Gas cylinder tests and examinations ................................................................................................ 22

11.1  General ................................................................................................................................................. 22

11.2  Hydraulic test ....................................................................................................................................... 22

11.3  Hardness test ....................................................................................................................................... 23

11.4  Leakage testing ................................................................................................................................... 23

© ISO 2012 – All rights reserved iii
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SIST EN ISO 7866:2012
ISO 7866:2012(E)

11.5  Examination for neck folds .................................................................................................................23

11.6  Marking verification .............................................................................................................................23

11.7  Aluminium alloy gas cylinder surface features at time of manufacture ........................................23

12  Certification ..........................................................................................................................................24

13  Marking .................................................................................................................................................25

Annex A (normative) Corrosion tests .............................................................................................................26

Annex B (normative) Test method to determine the sustained-load cracking resistance

of aluminium alloy gas cylinders .......................................................................................................36

Annex C (informative) Typical type approval certificate ...............................................................................43

Annex D (informative) Acceptance certificate ................................................................................................44

Annex E (normative) Specific requirements for gas cylinders made of high-strength and/or low-

elongation aluminium alloy ................................................................................................................46

Annex F (informative) Description and evaluation of manufacturing surface imperfections

and conditions for rejection of seamless aluminium alloy gas cylinders at time of product

acceptance ...........................................................................................................................................52

Annex G (normative) Batch size ......................................................................................................................59

Annex H (normative) Specific provisions for acetylene cylinder shells .....................................................60

Bibliography ......................................................................................................................................................61

iv © ISO 2012 – All rights reserved
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SIST EN ISO 7866:2012
ISO 7866:2012(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 7866 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 3, and by

Technical Committee CEN/TC 23, Transportable gas cylinders in collaboration.

This second edition cancels and replaces the first edition (ISO 7866:1999), which has been technically

revised.
The following significant technical changes have been carried out:

 a new subclause (11.7) has been added to address unacceptable manufacturing defects and

unacceptable surface features at the time of manufacture and changes have been made to other

subclauses to compliment the new subclause;
 terms and definitions and the symbols have been revised;
 terminology changes included: “stress” changed to “strength”;
 various editorial errors were corrected;
 equipment calibration requirements were added;
 defining "defect" as a feature caused by the manufacturing/manufacturer; and

 defining "imperfection" as damage or feature not caused by manufacturing/manufacturer.

© ISO 2012 – All rights reserved v
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SIST EN ISO 7866:2012
ISO 7866:2012(E)
Introduction

The purpose of this International Standard is to provide a specification for the design, manufacture, inspection

and testing of a seamless aluminium alloy gas cylinder for worldwide usage. The objective is to balance

design and economic efficiency against international acceptance and universal utility.

This International Standard aims to eliminate the concern about climate, duplicate inspections and restrictions

currently existing because of lack of definitive International Standards. This International Standard should not

be construed as reflecting on the suitability of the practice of any nation or region.

Following publication, this International Standard will be submitted for reference in the UN Recommendations

on the Transport of Dangerous Goods – Model Regulations.
vi © ISO 2012 – All rights reserved
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SIST EN ISO 7866:2012
INTERNATIONAL STANDARD ISO 7866:2012(E)
Gas cylinders — Refillable seamless aluminium alloy gas
cylinders — Design, construction and testing
1 Scope

This International Standard specifies minimum requirements for the material, design, construction and

workmanship, manufacturing processes and tests at time of manufacture of refillable seamless aluminium

alloy gas cylinders of water capacities up to and including 150 litres for compressed, liquefied and dissolved

gases for worldwide use (normally up to 65 °C).
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method

ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G,

H, K, N, T)

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 7438, Metallic materials — Bend test

ISO 7539-6:2011, Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of

pre-cracked specimens for tests under constant load or constant displacement

ISO 10461, Gas cylinders — Seamless aluminium-alloy gas cylinders — Periodic inspection and testing

ISO 11117, Gas cylinders — Valve protection caps and valve guards — Design, construction and tests

ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 13769, Gas cylinders — Stamp marking
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
artificial ageing

heat treatment process in which the solute phase is precipitated to give an increased yield strength and tensile

strength
3.2
bar·litres
product of the test pressure (in bars) and the water capacity (in litres)
© ISO 2012 – All rights reserved 1
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SIST EN ISO 7866:2012
ISO 7866:2012(E)
3.3
batch

quantity of gas cylinders, plus gas cylinders for destructive testing, of the same nominal diameter, wall

thickness, length and design, made successively from the same cast of aluminium alloy and subjected to the

same heat treatment on the same equipment for the same duration of time
NOTE See Table G.1 for batch size requirements.
3.4
design stress factor (variable)

ratio of equivalent wall stress at test pressure, p , to the guaranteed minimum yield strength, R

h eg
3.5
IAA

registration record of international alloy designations and chemical composition limits for wrought aluminium

and wrought aluminium alloys as published by the Aluminum Association
NOTE Such aluminium alloys are designated by the prefix “AA”.
3.6
mass of a gas cylinder

combined mass of the gas cylinder and all permanently attached parts (e.g. foot ring, neck ring), but without

the valve
NOTE Mass is expressed in kilograms.
3.7
quenching

controlled rapid cooling in a suitable medium to retain the solute phase in solid solution

3.8
solution heat treatment

thermal treatment which consists of heating products to a suitable temperature and holding them at that

temperature long enough to allow constituents to enter into solid solution
3.9
stabilizing heat treatment

non-ageing heat treatment applied to 5 000-series aluminium alloys in order to minimize changes in

mechanical properties and structure under service conditions
3.10
yield strength

value corresponding to the 0,2 % proof strength (0,2% non-proportional elongation), R , for aluminium

p0,2
alloys
4 Symbols

a calculated minimum wall thickness, in millimetres, of the cylindrical shell (see Figure 1)

a′ guaranteed minimum wall thickness, in millimetres, of the cylindrical shell
A percentage elongation after fracture

b guaranteed minimum thickness, in millimetres, at the centre of a convex base (see Figure 1)

1) Aluminum Association Inc., 900, 19th Street N.W., Washington D.C., 20006-2168, USA.

2 © ISO 2012 – All rights reserved
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SIST EN ISO 7866:2012
ISO 7866:2012(E)
d’ positive circular development of fracture
d’’ negative circular development of fracture

D nominal outside diameter, in millimetres, of the cylinder (see Figure 1 and Figure 2)

D nominal outside diameter, in millimeters, of the cylinder neck (see Figure 2)”.

D diameter, in millimetres, of the bend test former (see Figure 5)
E modulus of elasticity
F design stress factor (variable) (see 3.4)

H outside height, in millimetres, of the domed part (convex head or base end) (see Figure 1)

L′ length of short branch of fracture, in millimeters
L′′ length of long branch of fracture, in millimeters
L original gauge length, in millimetres, as defined in ISO 6892-1 (see Figure 4)

n ratio of the diameter of the bend test former to the actual thickness of the test specimen, t

p actual burst pressure, in bars above atmospheric pressure
p failure pressure, in bars
p hydraulic test pressure, in bars above atmospheric pressure
p upper cycling pressure, in bars

p observed pressure when gas cylinder starts yielding during hydraulic bursting test, in bars above

atmospheric pressure
r inside knuckle radius, in millimetres (see Figure 1)
r tip radius, in millimeters
r inside crown radius, in millimetres (see Figure 1)
R maximum stress value, in MPa

R actual value of the yield strength, in megapascals, as determined by the tensile test specified in 10.2

for the finished gas cylinder

R minimum guaranteed value of the yield strength (see 3.10), in megapascals, for the finished gas

cylinder

R actual value of the tensile strength, in megapascals, as determined by the tensile test specified in

10.2 for the finished gas cylinder

R minimum guaranteed value of the tensile strength, in megapascals, for the finished gas cylinder

R 0,2 % proof strength (0,2% non-proportional elongation), for aluminium alloys
p0,2

S original cross-sectional area, in square millimetres, of the tensile test specimen in accordance with

ISO 6892-1
t actual wall thickness, in millimetres, of the test specimen
© ISO 2012 – All rights reserved 3
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SIST EN ISO 7866:2012
ISO 7866:2012(E)

t average cylinder wall thickness, in millimetres, in the position of testing during the flattening test

T titre of hydrogen peroxide in g per litre

u ratio of distance between knife edges at the end of test to the average cylinder wall thickness

w width, in millimetres, of the narrow, parallel-sided section of a tensile test specimen (see Figure 4)

z correction factor
5 Inspection and testing

NOTE Evaluation of conformity can be performed in accordance with the regulations recognized by the country(ies)

where the gas cylinders are intended to be used.

To ensure that the gas cylinders conform to this International Standard, they shall be subjected to inspection

and testing in accordance with Clauses 9, 10 and 11 by an inspection body, hereafter referred to as the

“Inspection Body”, authorized to do so.

Equipment used for measurement, testing and examination during production shall be maintained and

calibrated within a documented quality managment system.
6 Materials
6.1 General requirements

6.1.1 Aluminium alloys and their chemical composition limits shall be as specified in Table 1. Other

aluminium alloys may be used to produce gas cylinders provided they satisfy all the requirements of this

International Standard and are approved by the relevant authority for cylinder use.

6.1.2 The gas cylinder manufacturer shall identify the gas cylinders with the particular casts of the alloy

from which they are made, and shall obtain and provide certificates of the analysis of the casts used. If check

analysis is required, they shall be carried out either on test specimens taken from material in the form supplied

by the producer of the aluminium alloy or from finished gas cylinders.

6.1.3 Some aluminium alloys are not compatible with certain gases and gas mixtures, e.g. corrosive gases

(see ISO 11114-1). The manufacturer shall use materials compatible with the intended gas service when the

purchaser indicates the intended gas.
4 © ISO 2012 – All rights reserved
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SIST EN ISO 7866:2012
ISO 7866:2012(E)
Table 1 — Chemical composition of materials
Chemical composition (% by mass) Others
Type of alloy
(IAA registered AA
Si Fe Cu Mn Mg Cr Ni Zn Ti Zr Pb Al
designation)
min. 0,7 — — 0,40 0,40 — — — — — — — —
6351A Remainder
max. 1,3 0,50 0,10 0,8 0,8 — — 0,20 0,20 — 0,003 0 0,05 0,15
min. 0,7 — — 0,40 0,60 — — — — — — — —
1 6082A Remainder
max. 1,3 0,50 0,10 1,0 1,2 0,25 — 0,20 0,10 — 0,003 0 0,05 0,15
min. 0,40 — 0,15 — 0,8 0,04 — — — — — — —
6061A Remainder
max. 0,8 0,7 0,40 0,15 1,2 0,35 — 0,25 0,15 — 0,003 0 0,05 0,15
min. — — — 0,50 4,5 — — — — — — — —
2 5283A Remainder
max. 0,30 0,30 0,03 1,0 5,1 0,05 0,03 0,10 0,03 0,05 0,003 0 0,05 0,15
min. — — 1,8 — 1,3 0,15 — 6,1 — — — — —
7060 Remainder
max. 0,15 0,20 2,6 0,20 2,1 0,25 — 7,5 0,05 0,05 0,003 0 0,05 0,15
min. — — 1,7 — 1,5 0,15 — 5,5 — — — — —
7032 Remainder
max. 0,10 0,12 2,3 0,05 2,5 0,25 0,05 6,5 0,1 0,05 0,003 0 0,05 0,15
min. — — 5,2 0,15 0,20 — — — — — — — —
4 2001 Remainder
max. 0,20 0,20 6,0 0,50 0,45 0,10 0,05 0,10 0,20 0,05 0,003 0 0,05 0,15
The bismuth content shall not exceed 0,0030 % (by mass).

NOTE The above materials are used extensively throughout the world in preference to the alloy compositions quoted in ISO 209. They are

included in this International Standard quoting the IAA registered designations, but making reference to ISO 209 where it is considered applicable.

6.2 Thermal treatments
6.2.1 Heat-treatable alloys (see Table 1, groups 1, 3 and 4)

The manufacturer shall specify, in the type approval documentation, the solution heat treatment and artificial-

ageing temperatures and the minimum times for which the gas cylinders have been held at those

temperatures. The medium used for quenching after solution heat treatment shall be identified.

6.2.2 Non-heat-treatable alloys (see Table 1, group 2)

The manufacturer shall specify, in the type approval documentation, the type of metal-forming operation

carried out (extrusion, drawing, iron
...

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