Copper and copper alloys - Seamless copper tubes for electrical purposes

This document specifies the composition, property requirements including electrical properties, and tolerances on dimensions and form for seamless drawn copper tubes for electrical purposes, delivered in straight lengths or alternatively in level wound coils with the cross-sections and size ranges below:
- for round tubes in straight lengths with outside diameters from 3 mm up to and including 450 mm and wall thicknesses from 0,3 mm up to and including 10 mm;
- for round tubes in level wound coils with outside diameters from 3 mm up to and including 30 mm and wall thicknesses from 0,3 mm up to and including 10 mm;
- for square and rectangular tubes with major outside dimension from 5 mm up to and including 150 mm and wall thicknesses from 0,5 mm up to and including 10 mm.
The sampling procedures and test methods for verification of conformity to the requirements of this document are also specified.

Kupfer und Kupferlegierungen - Nahtlose Rohre aus Kupfer für die Anwendung in der Elektrotechnik

Dieses Dokument legt die Zusammensetzung, die Anforderungen an die Eigenschaften einschließlich elektrischer Eigenschaften, Grenzabmaße und Formtoleranzen für nahtlose Kupferrohre für die Elektro-technik fest, die in geraden Längen oder alternativ in gespulten Ringen mit folgenden Querschnitten und Größenbereichen geliefert werden:
- für Rundrohre in geraden Längen mit Außendurchmessern von 3 mm bis 450 mm und Wanddicken von 0,3 mm bis 10 mm;
- für Rundrohre in gespulten Ringen mit Außendurchmessern von 3 mm bis 30 mm und Wanddicken von 0,3 mm bis 10 mm;
- für quadratische und rechteckige Rohre mit den größten Außenmaßen von 5 mm bis 150 mm und Wanddicken von 0,5 mm bis 10 mm.
Der Ablauf der Probenentnahme und die Prüfverfahren zur Feststellung der Übereinstimmung mit den Anforderungen dieses Dokuments sind ebenfalls festgelegt.

Cuivre et alliages de cuivre - Tubes sans soudure en cuivre pour usages électriques

Le présent document spécifie la composition, les caractéristiques, y compris les caractéristiques électriques, et les tolérances de dimensions et de forme des tubes étirés sans soudure en cuivre pour usages électriques fournis en longueurs droites ou en bobines trancannées, de coupes transversales et de dimensions suivantes :
- pour les tubes ronds en longueurs droites de diamètres extérieurs compris entre 3 mm et 450 mm inclus et d'épaisseurs de paroi comprises entre 0,3 mm et 10 mm inclus ;
- pour les tubes ronds en bobines trancannées de diamètres extérieurs compris entre 3 mm et 30 mm inclus et d'épaisseurs de paroi comprises entre 0,3 mm et 10 mm inclus ;
- pour les tubes carrés et rectangulaires de dimensions extérieures principales comprises entre 5 mm et 150 mm inclus et d'épaisseurs de paroi comprises entre 0,5 mm et 10 mm inclus.
Les procédures d'échantillonnage et les méthodes d'essai pour la vérification de la conformité aux exigences du présent document sont également spécifiées.

Baker in bakrove zlitine - Nevarjene bakrene cevi za uporabo v elektrotehniki

General Information

Status
Published
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
07-Apr-2021
Completion Date
07-Apr-2021

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SLOVENSKI STANDARD
SIST EN 13600:2021
01-julij-2021
Nadomešča:
SIST EN 13600:2013
Baker in bakrove zlitine - Nevarjene bakrene cevi za uporabo v elektrotehniki
Copper and copper alloys - Seamless copper tubes for electrical purposes

Kupfer und Kupferlegierungen - Nahtlose Rohre aus Kupfer für die Anwendung in der

Elektrotechnik

Cuivre et alliages de cuivre - Tubes sans soudure en cuivre pour usages électriques

Ta slovenski standard je istoveten z: EN 13600:2021
ICS:
77.150.30 Bakreni izdelki Copper products
SIST EN 13600:2021 en,fr,de

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

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SIST EN 13600:2021
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SIST EN 13600:2021
EN 13600
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2021
EUROPÄISCHE NORM
ICS 77.150.30 Supersedes EN 13600:2013
English Version
Copper and copper alloys - Seamless copper tubes for
electrical purposes

Cuivre et alliages de cuivre - Tubes sans soudure en Kupfer und Kupferlegierungen - Nahtlose Rohre aus

cuivre pour usages électriques Kupfer für die Anwendung in der Elektrotechnik
This European Standard was approved by CEN on 5 March 2021.

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, Turkey 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13600:2021 E

worldwide for CEN national Members.
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SIST EN 13600:2021
EN 13600:2021 (E)

Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 4

4 Designations...................................................................................................................................................... 5

4.1 Material ............................................................................................................................................................... 5

4.1.1 General ................................................................................................................................................................ 5

4.1.2 Symbol ................................................................................................................................................................. 5

4.1.3 Number ............................................................................................................................................................... 5

4.2 Material condition .......................................................................................................................................... 5

4.3 Product ................................................................................................................................................................ 6

5 Ordering information .................................................................................................................................... 7

6 Requirements ................................................................................................................................................... 8

6.1 Composition ...................................................................................................................................................... 8

6.2 Mechanical properties ................................................................................................................................... 8

6.3 Electrical properties ...................................................................................................................................... 9

6.4 Freedom from hydrogen embrittlement ................................................................................................ 9

6.5 Dimensions and tolerances ......................................................................................................................... 9

6.5.1 Outside dimensions ........................................................................................................................................ 9

6.5.2 Corner radii ....................................................................................................................................................... 9

6.5.3 Wall thickness .................................................................................................................................................. 9

6.5.4 Length .................................................................................................................................................................. 9

6.5.5 Form tolerances ............................................................................................................................................ 10

6.6 Mass tolerances............................................................................................................................................. 10

6.7 Surface condition ......................................................................................................................................... 11

7 Sampling .......................................................................................................................................................... 11

7.1 General ............................................................................................................................................................. 11

7.2 Analysis ............................................................................................................................................................ 11

7.3 Mechanical and electrical tests ............................................................................................................... 11

8 Test methods ................................................................................................................................................. 11

8.1 Analysis ............................................................................................................................................................ 11

8.2 Tensile test ..................................................................................................................................................... 12

8.3 Hardness test ................................................................................................................................................. 12

8.4 Electrical resistivity test ............................................................................................................................ 12

8.5 Hydrogen embrittlement test .................................................................................................................. 12

8.6 Retests .............................................................................................................................................................. 12

8.7 Rounding of results ..................................................................................................................................... 13

9 Declaration of conformity and inspection documentation ........................................................... 13

9.1 Declaration of conformity ......................................................................................................................... 13

9.2 Inspection documentation ........................................................................................................................ 13

10 Marking, packaging, labelling .................................................................................................................. 13

Annex A (informative) Characteristics of coppers for electrical purposes .......................................... 23

Bibliography ................................................................................................................................................................. 25

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SIST EN 13600:2021
EN 13600:2021 (E)
European foreword

This document (EN 13600:2021) has been prepared by Technical Committee CEN/TC 133 “Copper and

copper alloys”, the secretariat of which is held by DIN.

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 October 2021, and conflicting national standards shall

be withdrawn at the latest by October 2021.

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 13600:2013.
In comparison with EN 13600:2013, the following changes were made:
a) modification of tolerances on wall thicknesses;
b) update of normative references.

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, Turkey and the

United Kingdom.
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SIST EN 13600:2021
EN 13600:2021 (E)
1 Scope

This document specifies the composition, property requirements including electrical properties, and

tolerances on dimensions and form for seamless drawn copper tubes for electrical purposes, delivered

in straight lengths or alternatively in level wound coils with the cross-sections and size ranges below:

— for round tubes in straight lengths with outside diameters from 3 mm up to and including 450 mm

and wall thicknesses from 0,3 mm up to and including 10 mm;

— for round tubes in level wound coils with outside diameters from 3 mm up to and including 30 mm

and wall thicknesses from 0,3 mm up to and including 10 mm;

— for square and rectangular tubes with major outside dimension from 5 mm up to and including

150 mm and wall thicknesses from 0,5 mm up to and including 10 mm.

The sampling procedures and test methods for verification of conformity to the requirements of this

document are also specified.
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 1976, Copper and copper alloys — Cast unwrought copper products
EN ISO 2626, Copper — Hydrogen embrittlement test (ISO 2626)

EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1)

EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1)

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

(ISO 6892-1)
EN ISO 7438, Metallic materials — Bend test (ISO 7438)
EN ISO 8491, Metallic materials — Tube (in full section) — Bend test (ISO 8491)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
seamless tube

hollow semi-finished product, circular, square or rectangular in cross-section, having a uniform wall

thickness, which at all stages of production has a continuous periphery

Note 1 to entry: Tubes with a square or rectangular cross-section can have corners rounded along their whole

length.
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SIST EN 13600:2021
EN 13600:2021 (E)
3.2
mean diameter

arithmetical mean of any two diameters normal to each other at the same cross-section of the tube

3.3
deviation from circular form

difference between the maximum and minimum outside diameters measured at any one cross-section

of the tube
[SOURCE: EN 1057:2006+A1:2010, 3.6]
4 Designations
4.1 Material
4.1.1 General

The material is designated either by symbol or by number (see Table 1 and Table 2).

4.1.2 Symbol

The material symbol designation is based on the designation system given in ISO 1190-1.

NOTE Although material symbol designations used in this document might be the same as those in other

standards using the designation system in ISO 1190-1, the detailed composition requirements are not necessarily

the same.
4.1.3 Number

The material number designation is in accordance with the system given in EN 1412.

4.2 Material condition

For the purposes of this document, the following designations, which are in accordance with the system

given in EN 1173, apply for the material condition:

D Material condition for the product as cold worked without specified mechanical properties;

H… Material condition designated by the minimum value of hardness requirement for the product

with mandatory hardness requirements;

R… Material condition designated by the minimum value of tensile strength requirement for the

product with mandatory tensile strength, 0,2 % proof strength and elongation requirements.

Products in the H... condition can be specified to Vickers or Brinell hardness. The material condition

designation H... is the same for both hardness test methods.

Exact conversion between the material conditions designated H... and R... is not possible.

Material condition is designated by only one of the above designations.
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SIST EN 13600:2021
EN 13600:2021 (E)
4.3 Product

The product designation provides a standardized pattern of designation from which a rapid and

unequivocal description of a product can be conveyed in communication. It provides mutual

comprehension at the international level with regard to products which meet the requirements of the

relevant European Standard.
The product designation is no substitute for the full content of the document.
The product designation for products to this document shall consist of:
a) denomination (tube);
b) number of this document (EN 13600);
c) material designation, either symbol or number (see Table 1 and Table 2);
d) material condition designation (see Table 3);

e) cross-sectional shape (the following designations shall be used, as appropriate: RND for round, SQR

for square, RCT for rectangular);
f) nominal dimensions:
1) round tube in straight lengths: outside diameter × wall thickness × length
[either as manufactured length (ML) or fixed length (FL) (see 6.5.4)];

2) round tube in level wound coils: outside diameter × wall thickness × nominal coil weight;

3) square or rectangular tube: across-flats dimension(s) × wall thickness × length

[either as manufactured length (ML) or fixed length (FL) (see 6.5.4)].

The derivation of a product designation is shown in Example 1 and other typical product designations

are shown in Examples 2 and 3.
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SIST EN 13600:2021
EN 13600:2021 (E)

EXAMPLE 1 Tube for electrical purposes conforming to this document, in material designated either Cu-ETP or

CW004A, in material condition R250, round, with nominal outside diameter 100 mm and nominal wall thickness

5 mm, as manufactured length 3 000 mm, will be designated as follows:

EXAMPLE 2 Tube for electrical purposes conforming to this document, in material designated either Cu-0F or

CW008A, in material condition H065, square, nominal width across-flats 120 mm, nominal wall thickness 10 mm,

fixed length 4 500 mm, will be designated as follows:
Tube EN 13600 — Cu-OF — H065 — SQR120 × 10 × 4 500FL
or;
Tube EN 13600 — CW008A — H065 — SQR120 × 10 × 4 500FL

EXAMPLE 3 Tube for electrical purposes conforming to this document, in material designated either CuAg0,10

or CW013A, in material condition R290, rectangular, with nominal widths across-flats 140 mm and 80 mm,

nominal wall thickness 5 mm, fixed length 3 500 mm, will be designated as follows:

Tube EN 13600 — CuAg0,10 — R290 — RCT140 × 80 × 5 × 3 500FL
or;
Tube EN 13600 — CW013A — R290 — RCT140 × 80 × 5 × 3 500FL
5 Ordering information

In order to facilitate the enquiry, order and confirmation of order procedures between the purchaser

and the supplier, the purchaser shall state on his enquiry and order the following information:

a) quantity of product required (mass, number of tubes);
b) denomination (tube);
c) number of this document (EN 13600);
d) material designation (see Table 1 and Table 2);
e) material condition designation (see 4.2 and Table 3);
f) nominal dimensions:
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SIST EN 13600:2021
EN 13600:2021 (E)
1) round tube in straight lengths: outside diameter × wall thickness × length
[either as manufactured length (ML) or fixed length (FL) (see 6.5.4)];

2) round tube in level wound coils: outside diameter × wall thickness × nominal coil weight;

NOTE For round tubes, upon agreement between purchaser and supplier, the inside diameter can be

used as an alternative to the wall thickness.

3) square or rectangular tube: across-flats dimension(s) × wall thickness × length

[either as manufactured length (ML) or fixed length (FL) (see 6.5.4)].

It is recommended that the product designation, as described in 4.3, is used for items b) to f).

In addition, the purchaser shall also state on the enquiry and order any of the following, if required:

g) test method to be used for the measurement of hardness, i.e. Vickers or Brinell (see 8.3);

h) whether special tolerances on dimensions and form are required;
i) whether special surface conditions are required (see 6.7);
j) whether deburring is required (see 6.5.4.1);
k) whether a declaration of conformity is required (see 9.1);
l) whether an inspection document is required, and if so, which type (see 9.2);

m) whether there are any special requirements for marking, packaging or labelling (see Clause 10).

EXAMPLE Ordering details for 1 000 pieces tube for electrical purposes conforming to EN 13600, in material

designated either Cu-ETP or CW004A, in material condition R250, round, with nominal outside diameter 100 mm

and nominal wall thickness 5 mm, as manufactured length 3 000 mm:
1 000 pieces Tube EN 13600 — Cu-ETP — R250 — RND100 × 5 × 3000ML
or;
1 000 pieces Tube EN 13600 — CW004A — R250 — RND100 × 5 × 3000ML
6 Requirements
6.1 Composition

The composition shall conform to the requirements for the appropriate material given in Table 1 and

Table 2.
NOTE For characteristics of coppers for electrical purposes, see Annex A.
6.2 Mechanical properties

The mechanical properties shall conform to the appropriate requirements given in Table 3. The tests

shall be carried out in accordance with either 8.2 (tensile test) or 8.3 (hardness test).

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SIST EN 13600:2021
EN 13600:2021 (E)
6.3 Electrical properties

The electrical properties shall conform to the appropriate requirements given in Table 4. The test shall

be carried out in accordance with 8.4.
6.4 Freedom from hydrogen embrittlement

Tubes in copper grades Cu-OF (CW008A), CuAg0,10P (CW016A), CuAg0,10(OF) (CW019A), Cu-PHC

(CW020A) and Cu HCP (CW021A) shall show no evidence of cracking, when tested and visually

examined in accordance with 8.5.
6.5 Dimensions and tolerances
6.5.1 Outside dimensions

The dimensional tolerances are applied on the outside dimensions and wall thickness, if not otherwise

agreed between the purchaser and the supplier.
For round tubes, the diameter shall conform to the tolerances given in Table 5.

For square and rectangular tubes, the outside dimensions shall conform to the tolerances given in

Table 6.
6.5.2 Corner radii

The corner radii of square and rectangular tubes shall conform to the requirements given in Table 7.

6.5.3 Wall thickness

The wall thickness of round, square and rectangular tubes, measured at any one point, shall conform to

the tolerances given in Table 8.
6.5.4 Length
6.5.4.1 General

Tubes shall be supplied either in manufactured lengths or fixed lengths, with ends either sawn or

sheared.

If deburring of the cut ends of the tubes is required, it shall be agreed between the purchaser and the

supplier [see Clause 5, list entry j)].
6.5.4.2 Manufactured lengths

Manufactured lengths (ML) shall be supplied in the nominal lengths. The tolerances are by agreement

between the purchaser and the supplier.

It is permissible for 10 % of the number of tubes in a consignment to be shorter, but not less than 50 %

of the nominal length.
6.5.4.3 Fixed lengths

Tubes supplied as fixed lengths (FL) shall conform to the tolerances given in Table 9.

The deviation from squareness of the cut shall be a maximum of 2 % of the diameter or major across-

flats dimension of the tube and is included in the fixed length tolerance.
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SIST EN 13600:2021
EN 13600:2021 (E)
6.5.5 Form tolerances
6.5.5.1 General
The form tolerances given in 6.5.5.2 and 6.5.5.3 apply to:
a) outside dimensions equal to or greater than 10 mm;
b) all material conditions except H035 and R200.

The deviation shall be measured with the tube supported on a horizontal reference plane such that the

deviation is minimized by the mass of the tube.
6.5.5.2 Twist

Square and rectangular tubes shall conform to the tolerances given in Table 10. The twist v shall be

measured as indicated in Figure 1.
Key
1 reference plane
v twist
Figure 1 — Measurement of twist
6.5.5.3 Straightness
Tubes shall conform to the tolerances given in Table 11.
6.6 Mass tolerances
The mass of a consignment shall conform to the following mass tolerances:
— straight lengths: ±10 %;
— level wound coils: ±20 %.
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SIST EN 13600:2021
EN 13600:2021 (E)
6.7 Surface condition

The products shall be clean and free from injurious defects, which shall be specified by agreement

between the purchaser and the supplier at the time of enquiry and order. A superficial film of residual

lubricant is normally present on cold drawn products and is permissible unless otherwise specified.

It is permissible for annealed tubes to have a superficial, dull, iridescent oxide film on both the internal

and external surfaces.

Discontinuous irregularities on the external and internal surfaces of the tubes are permitted, if they are

within the dimensional tolerances.

Special requirements, e.g. degreasing, shall be agreed between the purchaser and the supplier

[see Clause 5, list entry i)].
7 Sampling
7.1 General

When required, (e.g. if necessary in accordance with specified procedures of a supplier's quality

management system, or when the purchaser requests inspection documents with test results, or for use

in cases of dispute), an inspection lot shall be sampled in accordance with 7.2 and 7.3.

7.2 Analysis

The sampling rate shall be in accordance with Table 12. A test sample, depending on the analytical

technique to be employed, shall be prepared from each sampling unit and used for the determination of

the composition.

When preparing the test sample, care should be taken to avoid contaminating or overheating. Carbide

tipped tools are recommended; steel tools, if used, should be made of magnetic material to assist in the

subsequent removal of extraneous iron. If the test samples are in finely divided form (e.g. drillings,

millings), they should be treated carefully with a strong magnet to remove any particles of iron

introduced during preparation.

In cases of dispute concerning the results of analysis, the full procedure given in ISO 1811-2 should be

followed.

Results may be used from analyses carried out at an earlier stage of manufacturing the product, e.g. at

the casting stage, if the material identity is maintained and if the quality management system of the

manufacturer is certified, e.g. as conforming to EN ISO 9001.
7.3 Mechanical and electrical tests

The sampling rate shall be in accordance with Table 12. Sampling units shall be selected from the

finished products. The test samples shall be cut from the sampling units. Test samples, and test pieces

prepared from them, shall not be subjected to any further treatment, other than any machining

operations necessary in the preparation of the test pieces.
8 Test methods
8.1 Analysis

Analysis shall be carried out on the test pieces, or test portions, prepared from the test samples

obtained in accordance with 7.2. Except in cases of dispute, the analytical methods used shall be

chemical or spectrographic according to ISO standards in force. In cases of dispute, chemical methods of

analysis shall be used. For expression of results, the rounding rules given in 8.7 shall be used.

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SIST EN 13600:2021
EN 13600:2021 (E)
8.2 Tensile test

The tensile properties shall be determined in accordance with EN ISO 6892-1 on the test pieces

obtained in accordance with 7.3.
8.3 Hardness test

Hardness shall be determined on test pieces prepared from the test samples obtained in accordance

with 7.3. The test shall be carried out in accordance with either EN ISO 6506-1 or EN ISO 6507-1 and

the impression/indentation made on the outside surface, unless otherwise agreed.

For the Brinell test in accordance with EN ISO 6506-1, a 0,102 F/D ratio of 10 shall be used, i.e. use a

1,00 mm diameter ball and a force of 98,07 N for thicknesses less than 2 mm, or a 2,5 mm diameter ball

and a force of 612,9 N for thicknesses equal to or greater than 2 mm.

For the Vickers test in accordance with EN ISO 6507-1, a test force of 49,03 N for thicknesses less than

2 mm or 98,07 N for thicknesses equal to or greater than 2 mm shall be used.
8.4 Electrical resistivity test

The test method used shall be left to the discretion of the supplier, e.g. eddy current method or

resistance bridge, if not otherwise specified.

The electrical resistivity shall be determined by direct measurement either at 20 °C ± 1 °C or at another

temperature, when the result shall be corrected to the equivalent value at 20 °C, on the product in the as

delivered condition.
8.5 Hydrogen embrittlement test

Tubes in the copper grades listed in 6.4 shall be subjected to the hydrogen embrittlement test, which

shall be carried out in accordance with EN ISO 2626.

Test pieces shall be of convenient dimensions, but machined test pieces shall retain some part of the

original surface to be on the outside of the bend. Any edges shall be rounded and smoothed.

After heating the test pieces in hydrogen, as described in EN ISO 2626, they shall be subjected to the

close bend test. The bend test shall be carried out either:
a) on a strip cut from a tube, in accordance with EN ISO 7438; or
b) on a tube in full section, in accordance with EN ISO 8491.
8.6 Retests

If there is a failure of one, or more than one, of the tests in 8.1 to 8.5, two test samples from the same

inspection lot shall be permitted to be selected for retesting the failed property(ies). One of these test

samples shall be taken from the same sampling unit as that from which the original failed test piece was

taken, unless that sampling unit is no longer available, or has been withdrawn by the supplier.

If the test pieces from both test samples pass the appropriate test(s), then the inspection lot

represented shall be deemed to confo
...

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