SIST EN 12392:2025

SLOVENSKI STANDARD
01-december-2025
Aluminij in aluminijeve zlitine - Gnetne in ulite zlitine - Posebne zahteve za
aluminijeve izdelke za izdelavo tlačnih naprav
Aluminium and aluminium alloys - Wrought products and cast products - Special
requirements for products intended for the production of pressure equipment
Aluminium und Aluminium-Legierungen - Knet- und Gusserzeugnisse - Besondere
Anforderungen an Erzeugnisse für die Fertigung von Druckgeräten
Aluminium et alliages d’aluminium - Produits corroyés et moulés - Exigences
particulières pour les produits destinés à la fabrication des équipements sous pression
Ta slovenski standard je istoveten z: EN 12392:2025
ICS:
77.150.10 Aluminijski izdelki Aluminium products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12392
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 77.150.10 Supersedes EN 12392:2016+A1:2022
English Version
Aluminium and aluminium alloys - Wrought products and
cast products - Special requirements for products intended
for the production of pressure equipment
Aluminium et alliages d'aluminium - Produits corroyés Aluminium und Aluminium-Legierungen - Knet- und
et moulés - Exigences particulières pour les produits Gusserzeugnisse - Besondere Anforderungen an
destinés à la fabrication des équipements sous Erzeugnisse für die Fertigung von Druckgeräten
pression
This European Standard was approved by CEN on 30 June 2025.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12392:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 8
4 Symbols .13
5 Materials .14
5.1 General .14
5.2 Wrought products .14
5.3 Cast products .14
5.4 Elongation after fracture .14
6 Technical conditions for inspection and delivery .15
6.1 Manufacturing methods .15
6.1.1 General .15
6.1.2 Specific requirements regarding porthole extruded and/or drawn products .15
6.1.3 Quality control .16
6.2 Orders or tenders .17
6.3 Test procedures .18
6.3.1 General .18
6.3.2 Chemical analysis of the melt .18
6.3.3 Hydrogen content .18
6.3.4 Tensile and hardness testing .18
6.3.5 Specific test procedures by product form .20
6.4 Inspection documents .24
6.5 Marking .24
6.6 Packaging .25
7 Mechanical properties .25
7.1 Mechanical properties at room temperature .25
7.1.1 General .25
7.1.2 Sheet, strip, plate and circles .25
7.1.3 Extruded rod/bar, tube, coiled tube and profile.25
7.1.4 Cold drawn rod/bar, tube and coiled tube .25
7.1.5 Forgings .25
7.1.6 Castings .25
7.2 Low and high temperature properties .25
8 Tolerances on dimensions and form .26
8.1 Sheet, strip, plate and circles .26
8.2 Extruded rod/bar, tube, coiled tube and profile.26
8.3 Cold drawn rod/bar, tube and coiled tube .26
8.4 Forgings .26
8.5 Castings .26
Annex A (informative) Materials and application ranges .39
Annex B (informative) Tensile properties at low and high temperatures .47
B.1 General .47
B.2 Wrought products . 48
B.3 Cast products . 52
Annex C (normative) Empirical conversion between values of A and A . 56
Annex D (informative) Significant technical changes between this document and its
previous edition . 60
Annex ZA (informative) Relationship between this European Standard and the essential
safety requirements of Directive 2014/68/EU aimed to be covered . 63
Bibliography . 64
European foreword
This document (EN 12392:2025) has been prepared by Technical Committee CEN/TC 132 “Aluminium
and aluminium alloys”, the secretariat of which is held by AFNOR.
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 April 2026, and conflicting national standards shall be
withdrawn at the latest by April 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12392:2016+A1:2022.
Details of significant technical changes between this document and its previous edition are provided at
Annex D.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document specifies the material requirements and testing procedures applicable to wrought and
cast aluminium and aluminium alloys intended for use in the production of pressure equipment.
This document covers:
— the products forms, grades and tempers of wrought and cast aluminium and aluminium alloys which
are used for such applications together with data for wrought and cast alloys over their permissible
working temperature ranges;
— the technical conditions for inspection and delivery, mechanical property limits and tolerances on
form and dimensions by reference to the appropriate European standards for the relevant wrought
and cast aluminium and aluminium alloys;
— additional requirements which are specific to pressure equipment applications.
It applies to hot-rolled plate, cold-rolled sheet/strip/circles, extruded or extruded and cold drawn
rod/bar, tube, extruded open/hollow profiles, forgings and castings. Considering this, this document is
intended to be used in conjunction with the EN 573 series, EN 485 series, EN 941, EN 754 series, EN 755
series, EN 586 series and EN 1706. The materials and application ranges covered by this document are
those given in Annex A, Table A.1 for wrought alloys and Table A.2 for castings.
The objective of this document is to only cover the materials used for components of pressure equipment.
Fabrication or fabrication methods for pressure equipment are excluded from this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN 485-1:2016, Aluminium and aluminium alloys — Sheet, strip and plate — Part 1: Technical conditions
for inspection and delivery
EN 485-2:2016+A1:2018, Aluminium and aluminium alloys — Sheet, strip and plate — Part 2: Mechanical
properties
EN 485-3:2003, Aluminium and aluminium alloys — Sheet, strip and plate — Part 3: Tolerances on
dimensions and form for hot-rolled products
EN 485-4:1993, Aluminium and aluminium alloys — Sheet, strip and plate — Part 4: Tolerances on shape
and dimensions for cold-rolled products
EN 573-3:2019+A2:2023, Aluminium and aluminium alloys — Chemical composition and form of wrought
products — Part 3: Chemical composition and form of products
EN 586-1:1997, Aluminium and aluminium alloys — Forgings — Part 1: Technical conditions for inspection
and delivery
EN 586-2:1994, Aluminium and aluminium alloys — Forgings — Part 2: Mechanical properties and
additional property requirements
EN 586-3:2001, Aluminium and aluminium alloys — Forgings — Part 3: Tolerances on dimensions and form
EN 754-1:2016, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 1: Technical
conditions for inspection and delivery
EN 754-2:2024, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 2: Mechanical
properties
EN 754-3:2008, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 3: Round bars,
tolerances on dimensions and form
EN 754-4:2008, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 4: Square bars,
tolerances on dimensions and form
EN 754-5:2008, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 5: Rectangular
bars, tolerances on dimensions and form
EN 754-6:2008, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 6: Hexagonal
bars, tolerances on dimensions and form
EN 754-7:2016, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 7: Seamless
tubes, tolerances on dimensions and form
EN 754-8:2016, Aluminium and aluminium alloys — Cold drawn rod/bar and tube — Part 8: Porthole tubes,
tolerances on dimensions and form
EN 755-1:2016, Aluminium and aluminium alloys— Extruded rod/bar, tube and profiles — Part 1:
Technical conditions for inspection and delivery
EN 755-2:2016, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 2:
Mechanical properties
EN 755-3:2008, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 3: Round
bars, tolerances on dimensions and form
EN 755-4:2008, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 4: Square
bars, tolerances on dimensions and form
EN 755-5:2008, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 5:
Rectangular bars, tolerances on dimensions and form
EN 755-6:2008, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 6:
Hexagonal bars, tolerances on dimensions and form
EN 755-7:2016, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 7:
Seamless tubes, tolerances on dimensions and form
EN 755-8:2016, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 8: Porthole
tubes, tolerances on dimensions and form
EN 755-9:2016, Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles — Part 9: Profiles,
tolerances on dimensions and form
EN 764-5:2014, Pressure equipment — Part 5: Inspection documentation of metallic materials and
compliance with the material specification
EN 941:2022, Aluminium and aluminium alloys — Circle and circle stock for the production of general
applications — Specifications
EN 1370:2011, Founding — Examination of surface condition
EN 1371-1:2011, Founding — Liquid penetrant testing — Part 1: Sand, gravity die and low pressure die
castings
EN 1559-1:2011, Founding — Technical conditions of delivery — Part 1: General
EN 1559-4:2015, Founding — Technical conditions of delivery — Part 4: Additional requirements for
aluminium alloy castings
EN 1706:2020+A1:2021, Aluminium and aluminium alloys — Castings — Chemical composition and
mechanical properties
EN 1779:1999, Non-destructive testing — Leak testing — Criteria for method and technique selection
EN 1779:1999/A1:2003, Non-destructive testing — Leak testing — Criteria for method and technique
selection
EN 2004-1:1993, Aerospace series — Test methods for aluminium and aluminium alloy products — Part 1:
Determination of electrical conductivity of wrought aluminium alloys
EN 2101:1991, Aerospace series — Chromic acid anodizing of aluminium and wrought aluminium alloys
EN 12020-1:2022, Aluminium and aluminium alloys — Extruded precision profiles in alloys EN AW-6060
and EN AW-6063 — Part 1: Technical conditions for inspection and delivery
EN 12020-2:2022, Aluminium and aluminium alloys — Extruded precision profiles in alloys EN AW-6060
and EN AW-6063 — Part 2: Tolerances on dimensions and form
EN 12258-1:2012, Aluminium and aluminium alloys — Terms and definitions — Part 1: General terms
EN 12681-1:2017, Founding — Radiographic testing — Part 1: Film techniques
EN 12681-2:2017, Founding — Radiographic testing — Part 2: Techniques with digital detectors
EN 13957:2008, Aluminium and aluminium alloys — Extruded round, coiled tube for general applications
— Specification
EN 13958:2008, Aluminium and aluminium alloys — Cold drawn, round, coiled tube for general
applications — Specification
EN 14242:2023, Aluminium and aluminium alloys — Chemical analysis — Inductively coupled plasma
optical emission spectrometric analysis
EN 14361:2025, Aluminium and aluminium alloys — Chemical analysis — Sampling from metal melts
EN 14726:2019, Aluminium and aluminium alloys — Determination of the chemical composition of
aluminium and aluminium alloys by spark optical emission spectrometry
EN ISO 148-1:2016, Metallic materials — Charpy pendulum impact test — Part 1: Test method
(ISO 148-1:2016)
EN ISO 3452-1:2021, Non-destructive testing — Penetrant testing — Part 1: General principles
(ISO 3452-1:2021)
EN ISO 6506-1:2014, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1:2014)
EN ISO 6892-1:2019, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
(ISO 6892-1:2019)
EN ISO 8062-3:2023, Geometrical product specifications (GPS) — Dimensional and geometrical tolerances
for moulded parts — Part 3: General dimensional and geometrical tolerances and machining allowances for
castings using ± tolerances for indicated dimensions (ISO 8062-3:2023)
EN ISO 8492:2013, Metallic materials — Tube — Flattening test (ISO 8492:2013)
EN ISO 8493:2004, Metallic materials — Tube — Drift-expanding test (ISO 8493:1998)
EN ISO 8495:2013, Metallic materials — Tube — Ring-expanding test (ISO 8495:2013)
EN ISO 8496:2013, Metallic materials — Tube — Ring tensile test (ISO 8496:2013)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12258-1:2012 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
heat-treatment lot
quantity of products of the same alloy or purity grade of alloy, form, thickness or cross-section and
produced in the same way and heat-treated in one furnace load; or such products solution-treated and
subsequently precipitation treated in one furnace load
Note 1 to entry: More than one solution-treatment batch can be included in one ageing furnace load.
Note 2 to entry: For heat treatment in a continuous furnace (vertical or horizontal), the products continuously
heat-treated during a specified time (e.g. 8 h) can be considered as one heat treatment lot.
Note 3 to entry: For forgings, a heat-treatment lot may consist of a group of forgings of similar size and shape.
[SOURCE: EN 12258-1:2012, 4.1.5, modified – addition of Note 3 to entry]
3.2
inspection lot
consignment, or a part thereof submitted for inspection or sampling and characterised by a set of
identical criteria, e.g. grade or alloy, temper, size, shape, thickness or cross-section or fabrication batch
Note 1 to entry: For forgings, an inspection lot may consist of a group of forgings of similar size and shape.
[SOURCE: EN 12258-1:2012, 4.1.2, modified – addition of Note 1 to entry]
3.3
melt
quantity of molten metal that has simultaneously undergone the same preparatory treatment in the
furnace before the casting operation
[SOURCE: EN 12258-1:2012, 4.1.3]
3.4
cast
quantity of products cast simultaneously from the same melt
[SOURCE: EN 12258-1:2012, 4.1.4]
3.5
casting
product at or near finished shape, formed by solidification of the metal in a mould or a die
Note 1 to entry: Casting is also the process in which molten metal is poured into a mould and solidified
Note 2 to entry: Pressure die-cast products are excluded from the scope of the present standard.
Note 3 to entry: The mould of concern can be a single use mould (sand) or a permanent mould (e.g. cast iron or
steel).
[SOURCE: EN 12258-1:2012, 2.5.1, modified – addition of Notes to entry]
3.6
forging
wrought product formed by hammering or pressing, typically when hot, such as open die forging, drop
or closed die forging or seamless rolled ring forging
[SOURCE: EN 12258-1:2012, 2.10.1]
3.7
tube
hollow, wrought product with a uniform cross-section, with only one enclosed void and with a uniform
wall thickness, supplied in straight lengths or in coiled form
Note 1 to entry: Cross-sections are in a round, oval, square or rectangular shape, or in a shape of an equilateral
triangle or a regular polygon, and can have rounded corners, provided the inner and outer cross-sections are
concentric and have the same form and orientation.
[SOURCE: EN 12258-1:2012, 2.8.12, modified – text of Note 1 to entry]
3.8
longitudinal extrusion seam
extrusion seam in a hollow profile or a tube, parallel to the extrusion direction, which has been formed
after creating two or more streams of metal and rejoining them around the mandrel of a porthole or
bridge die
Note 1 to entry: Extrusion seams are naturally occurring in porthole/bridge dies.
[SOURCE: EN 12258-1:2012, 3.4.13, modified - Note 2 to entry of 3.4.13 is not applicable]
3.9
transverse extrusion seam
extrusion seam which is formed when two successive billets are welded together in the extrusion die
Note 1 to entry: This concept is sometimes termed “Charge Weld”.
[SOURCE: EN 12258-1:2012, 3.4.14, modified – the word “subsequent” replaced by “successive” in the
definition and a new Note 1 to entry added from EN 12258-1:2012, 3.4.13, Note 2 to entry]
3.10
vessel
housing designed and built to contain fluids under pressure including its direct attachments up to
the coupling point connecting it to other equipment
Note 1 to entry: A vessel may be composed of more than one chamber.
[SOURCE: European Legislation for Pressure Equipment]
3.11
piping
piping components intended for the transport of fluids, when connected together for integration into
a pressure system
Note 1 to entry: Piping includes in particular a pipe or system of pipes, tubing, fittings, expansion joints, hoses, or
other pressure-bearing components as appropriate.
Note 2 to entry: Heat exchangers consisting of pipes for the purpose of cooling or heating air shall be considered
as piping.
[SOURCE: European Legislation for Pressure Equipment]
3.12
fluids
gases, liquids and vapours in pure phase as well as mixtures thereof; fluids may contain a suspension
of solids
[SOURCE: European Legislation for Pressure Equipment]
Note 1 to entry: If the fluid has a vapour pressure at the maximum allowable temperature of the equipment of
greater than 0,5 bar above normal atmospheric pressure it is treated as a gas, otherwise as a liquid.
3.13
maximum allowable pressure
PS
maximum pressure for which the equipment is designed, and specified for a specific point on the pressure
equipment, being either the connection of protective and/or limiting devices, or the top of equipment or,
if not appropriate, any point specified
[SOURCE: European Legislation for Pressure Equipment]
3.14
nominal size
DN
numerical designation of size which is common to all components in a piping system other than
components indicated by outside diameters or by thread size
Note 1 to entry: It is a convenient round number for reference purposes and is only loosely related to
manufacturing dimensions; the nominal size is designated by DN followed by a number.
[SOURCE: European Legislation for Pressure Equipment]
3.15
volume
V
internal volume of a chamber, including the volume of nozzles to the first connection or weld and
excluding the volume of permanent internal parts
[SOURCE: European Legislation for Pressure Equipment]
3.16
operating temperature range
temperature range at which the material is exposed during its use
3.17
proof strength - yield strength
stress necessary to produce a defined small plastic deformation in a material under uniaxial tensile or
compressive load
Note 1 to entry: If the plastic deformation under tensile load is defined as 0,2 %, then the term
“proof strength R “ or “yield strength 0,2 %” is used.
p0,2
Note 2 to entry: The term “proof strength” is used in European and ISO standards, whereas the term “yield
strength” is used in North American documents.
[SOURCE: EN 12258-1:2012, 4.3.4]
3.18
elongation (to fracture)
percentage increase in distance between two marks on a test piece, termed “gauge marks”, that results
from straining the test piece in tension to fracture between these gauge marks
Note 1 to entry: The elongation depends on the distance between the gauge marks.
Note 2 to entry: The elongation depends on the cross-sectional dimensions of the test piece. For example, the
values obtained from sheet specimens will be lower for thin sheet than for thicker sheet. The same is true for
extrusions.
Note 3 to entry: Elongation is the simplest and most common representation of the ductility of the material.
[SOURCE: EN 12258-1:2012, 4.3.5]
3.19
elongation
A
50mm
percentage elongation after fracture related to an original gauge length of 50 mm and a constant original
width of the test piece between the gauge marks
Note 1 to entry: Existing standards specify the original width of the test piece between the gauge marks as
12,5 mm.
Note 2 to entry: In the USA, the gauge length is often 2 inches, i.e. 50,8 mm.
[SOURCE: EN 12258-1:2012, 4.3.7]
3.20
elongation
A
percentage elongation after fracture related to a gauge length of 5, 65⋅ S , where S is the initial cross-
sectional area of the test-piece
Note 1 to entry: The earlier designation A should be avoided.
Note 2 to entry: For round cross-sections the gauge length is calculated as 5 × d, where d is the diameter of the
test-piece between the gauge marks.
Note 3 to entry: In some USA documents the gauge length is also specified as 4 × d.
[SOURCE: EN 12258-1:2012, 4.3.8]
4 Symbols
The symbols used in this document and corresponding designations are given in Table 1.
Table 1 — Symbols and designations
Symbol Unit Designation
R MPa Tensile strength
m
R MPa Proof strength after 0,2 % of permanent elongation
p0,2
R MPa Proof strength after 1,0 % of permanent elongation
p1,0
Percentage elongation after fracture related to an original gauge length
A %
of 50 mm
Percentage elongation after fracture related to an original gauge length
A %
of 5,65⋅ S 50 mm
A % Elongation
H mm Distance between platens measured under load
C mm Minimum external diameter achieved after flairing test
γ MS/m Electrical conductivity
L mm Initial gauge length of sample at tensile testing
S mm Initial cross-section of sample at tensile testing
Nominal thickness of the product (specific definition applies to each
t mm
product form)
DN - Numerical designation for size (piping systems)
PS bar Maximum pressure
V litres Internal volume of a chamber
OD mm Outside diameter
ID mm Inside diameter
Creep rupture strength after 10 000 h of exposition at indicated
R MPa
km10
temperature
Creep rupture strength after 100 000 h of exposition at indicated
Rkm10 MPa
temperature
5 Materials
5.1 General
The materials covered by this document are intended to be used in a wide range of pressure equipment
operating over diverse range of both pressure and temperature. The range of applications extends from
relatively low-pressure automotive equipment such as heat exchangers to heavy duty applications
including unfired pressure vessels and piping used in pressure equipment.
Materials (alloys and tempers), which can be used in compliance with the present standard are listed in
Table 2, Table 3, Table A.1 and Table A.2, together with their welding characteristics, main field of
application and operating temperature ranges.
If the pressure equipment is operating above room temperature for times exceeding 100 h, then the long-
time behaviour of the material as provided at Annex B, Tables B.1 to B.4 will need to be taken into
consideration.
Materials used for welded components shall be produced with a hydrogen level no greater than 0,20 ml
per 100 g aluminium, or an equivalent value/level determined by an alternative defined method stated
on the order (see 6.3.3).
5.2 Wrought products
Applicable alloys for wrought products which are used for pressure applications are given in Table 2.
Their chemical composition shall be in accordance with EN 573-3:2019+A2:2023.
All grades of wrought aluminium and aluminium alloys shall have a lead (Pb) and tin (Sn) content not
exceeding 0,015 0 % (150 ppm) by mass, per each element.
5.3 Cast products
Applicable alloys for cast products are given in Table 3. Their chemical compositions shall be as specified
in EN 1706:2020+A1:2021.
5.4 Elongation after fracture
Wrought and cast products in aluminium and aluminium alloys specifically used for welded parts of
unfired pressure vessels or metallic industrial piping and subjected to cold forming (e.g. rolled shells and
heads) shall have a specified minimum elongation value after fracture A measured on a gauge length as
follows:
LS= 5, 65⋅ (1)
and ≥ 14 % in the longitudinal or transverse direction.
Wrought and cast products in aluminium and aluminium alloys used for parts of unfired pressure vessels
or metallic industrial piping that are not subjected to cold forming (e.g. straight flanges and nozzles) shall
have a specified minimum elongation value after fracture A measured on a gauge length as follows:
LS= 5, 65⋅ (2)
and ≥ 10 % in the longitudinal or transverse direction.
where
L is the original gauge length;
S is the original cross-sectional area of the parallel length.
The conversion of A values into A and vice versa shall be carried out as specified in Annex C.
When using minimum A values converted from A values as requirements, the converted A value shall
50 50
be taken from Table C.1 then rounded up to the next whole number.
EXAMPLE 1 A converted value A50 of 12,2 % shall be implemented as a minimum requirement of A value by
13 %.
EXAMPLE 2 A 12,5 mm wide rectangular test piece is prepared from rolled sheet with a thickness of 2,0 mm. As
the cross-sectional area of this test piece is 25 mm , then the corresponding gauge length for a proportional test
piece is 28,3 mm. In this case, a measured value of A50 by 13,0 % corresponds to an approximate elongation value A
of 17,0 %.
EXAMPLE 3 An elongation value A of 24,0 % is measured on a proportional test piece with a gauge length of
35,7 mm and a thickness of 3,2 mm. This corresponds to an elongation value A50 of 20,9 %, when being measured
on a 12,5 mm wide rectangular test piece, which cross-sectional area will be 40 mm .
EXAMPLE 4 A wrought material in thickness 12,0 mm is to be selected for a part to be cold deformed and welded
during fabrication. As consequence the tensile test samples can be either:
— a proportional test sample with a cross-section of 150 mm and a gauge length of 69,2 mm, for which the
minimum elongation value A of 14 % will apply, or,
— a non-proportional test sample with a cross-section of 150 mm and a gauge length of 50 mm. In this case the
minimum A50 value to apply will be 20 %, as rounded up to the next whole number from the indicated value of
19,1 % in Table C.1.
6 Technical conditions for inspection and delivery
6.1 Manufacturing methods
6.1.1 General
The manufacturing methods used shall be independently selected without obligation to use the same
processes or process route for subsequent or similar orders.
When the manufacturing method to be used is restricted or fixed, it shall be stated on the purchase order.
6.1.2 Specific requirements regarding porthole extruded and/or drawn products
Regarding porthole extruded and/or drawn products, limitations for safe application of such products as
mentioned in Tables 4 and 5 shall apply.
The stated values for maximum allowable pressure (PS) and volume (V) disclosed in Table 4 and Table 5
are limitations superseding those required by European Legislation for Pressure Equipment.
Table 4 applies to porthole extruded tube specified in EN 755-8:2016, porthole extruded and drawn tube
specified in EN 754-8:2016, porthole extruded hollow profiles specified in EN 755-9:2016 and porthole
extruded precision profiles specified in EN 12020-1:2022 and shall be used up to and including a nominal
diameter of 600 mm (DN 600) and a maximum thickness (t) of 20 mm.
Table 5 applies to porthole extruded coiled tube specified in EN 13957:2008 and porthole extruded and
drawn coiled tube specified in EN 13958:2008 and shall be used up to and including a nominal diameter
of 50 mm (DN 50) and a maximum thickness (t) of 5 mm.
NOTE 1 Tubular products are generally defined by outside diameter (OD), inside diameter (ID) and wall
thickness (t). DN mentioned here corresponds to a nominal diameter average of OD and ID.
When placing an order, it shall be ensured that the following information is provided, in order to
implement the requirements of Table 4 or Table 5:
— pressure product category according to European Legislation for Pressure Equipment;
— type of equipment and fluids;
— maximum pressure for which the equipment is designed (PS);
— confirmation that the completed equipment assembly is pressure tested.
In addition to the limitations for nominal size DN and thickness t, additional requirements regarding
pressure PS, volume V and testing procedures as specified in Table 4 or Table 5 shall apply. Destructive
testing procedure of extrusion seam shall be determined and stated on the order documents (see 6.2) at
least with the following frequencies:
P1: Front end of every extrusion string;
P2: Front and back end of every extrusion string;
P3: Front and back end of every extrusion string including additional destructive tests along the length,
depending on the dimensions (cross-section and length) of the pressurized profile chamber
corresponding to a maximum enclosed volume of 200 l;
S: According to the requirements of EN 755-1 or EN 754-1 regarding the frequency of mechanical testing,
and including macroscopic and/or destructive tests as required in these documents;
TBD: higher testing frequency than S, to be specified and stated on the order;
N/A: Not applicable.
In contrast to longitudinal seams which are covered by the above provisions and Tables 4 and 5,
transverse extrusion seams (charge welds) shall not be allowed in extruded or extruded/drawn products
used for pressure equipment.
However, transverse extrusion seams for coiled tubes according to EN 13957:2008 and EN 13958:2008
may be used, provided that the integrity of the extrusion seams is ensured by quality assurance/testing
procedures based on the requirements of Table 5 and stated on the order.
NOTE 2 Some further comment is necessary on the methods of extrusion used for tube and hollow profiles. In
particular, seamless extrusion produces a product that does not contain any seams or weld lines in the product
cross-section. On the other hand, extruded products manufactured using a porthole or bridge die contains at least
one longitudinal weld or seam. The presence of such welds or seams can be a major concern on products that are
used for e.g. pressure vessels since the weld/seam can lead to premature failure of the vessel under pressure.
NOTE 3 In addition, despite rigorous process control during the extrusion process, there is no definitive non-
destructive test method that can provide total assurance of the integrity of the welds in the product cross-section.
In view of the safety implications of using porthole products, guidelines regarding the use of porthole products are
provided in this document.
Applicable testing procedures shall be specified and stated on the order for porthole extrusion products
used for applications exceeding the limitations specified in Table 4 or Table 5.
6.1.3 Quality control
All inspection and tests required by this document shall be undertaken prior to shipment of the product.
Any additional inspection required shall be stated on the purchase order (see 6.2).
6.2 Orders or tenders
The order or tender documents shall define the product required and contain the following minimum
information:
a) the type and form of the product. In the case of tube whether extruded, cold drawn or coiled, it is also
essential to state the method of extrusion to be used i.e. seamless or porthole (see also point i)
below);
b) reference to this particular document;
c) alloy and temper;
d) the dimensions and shape of the particular product required;
1) plate: thickness, width and length;
2) sheet: thickness, width and length;
3) strip: thickness width and coil dimensions;
4) circles: thickness and diameter;
5) round tube: method of production, outside (OD) or inside (ID) diameter, wall thickness (t), and
length;
NOTE 1 Two of the OD/ID/t dimensions can be given tolerances but not all three.
6) coiled round tube: outside (OD) or inside (ID) diameter, wall thickness (t), coil dimensions and
tube length if required in straight lengths;
NOTE 2 Two of the OD/ID/t dimensions can be given tolerances but not all three.
7) round bar: diameter and length;
8) square and hexagonal bar: width across flats and length;
9) rectangular bar: width, thickness and length;
10) extruded profiles and hollow sections: drawing of cross-section and length;
11) forgings (open-die forgings, closed-die forgings and seamless rolled rings): reference to drawing
or finished size;
12) castings: reference to a drawing.
e) the product tolerances on dimensions and form together with particular reference to the relevant
European standard for the specific product concerned;
f) any requirement regarding mechanical properties, when differing from those specified in the
applicable document for a specific product form (see Clause 7);
NOTE 3 This specifically applies to wrought products to be tested to tempers T42 or T62, or castings for
which higher mechanical properties than those mentioned in EN 1706:2020+A1:2021.
g) quantity required: whether it is weight, number of pieces, total length and the quantity tolerance on
the total amount of the order;
h) product certification requirement with particular reference to EN 764-5:2014;
i) identification marking requirements;
j) surface finish requirements particularly details of any surface treatments to be carried out;
k) the order shall clearly show if the ordered product is to be produced by the porthole extrusion
method. In case of porthole extrusion, additional information as expressed in 6.1.2 shall be provided;
l) any other special requirements (e.g. grain size). This applies to particular requirements such as
flattening test, leak test, ultrasonic test, etc., which shall be expressly stated together with the criteria
to which the material shall be verified;
m) any additional inspection to be carried out prior to delivery;
n) surface protection oil requirements;
o) packaging methods to be used;
p) manufacturing method if restricted or fixed.
6.3 Test procedures
6.3.1 General
This subclause covers only chemical composition and tensile / hardness testing which are common to all
the products. The remaining test procedures and methods are given in the sections dealing with the
individual products.
Unless otherwise stated on the purchase order, the following test procedures disclosed in the following
sections shall apply.
6.3.2 Chemical analysis of the melt
The samples for chemical analysis shall be taken at the time of casting or melting in accordance with
EN 14361:2025. The methods of analysis shall be EN 14726:2019 or EN 14242:2023. The use of any
other method for sampling or determining the chemical composition shall be specified and stated on th
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