EN 12164:2024
(Main)Copper and copper alloys - Rod for free machining purposes
Copper and copper alloys - Rod for free machining purposes
This document specifies the composition, property requirements and dimensional tolerances for copper alloy rod, in the shape of circles, squares, hexagons or octagons, finally produced by drawing or extruding, especially intended for free machining purposes.
The sampling procedures and the methods of test for verification of conformity to the requirements of this document are also specified.
Kupfer und Kupferlegierungen - Stangen für die spanende Bearbeitung
Dieses Dokument legt die Zusammensetzung, die Anforderungen an die Eigenschaften und Grenzabmaße für durch Ziehen oder Pressen endgefertigte Stangen in runder, quadratischer, sechseckiger oder achteckiger Form aus Kupferlegierungen für die spanende Bearbeitung fest.
Der Ablauf der Probenahme und die Prüfverfahren zur Feststellung der Übereinstimmung mit den Anforderungen dieses Dokuments sind ebenfalls festgelegt.
Cuivre et alliages de cuivre - Barres pour décolletage
Le présent document spécifie la composition, les exigences de propriétés et les tolérances dimensionnelles des barres en alliage de cuivre de forme ronde, carrée, hexagonale ou octogonale, fabriquées par étirage ou filage, particulièrement conçues pour le décolletage.
Les modes opératoires d’échantillonnage et les méthodes d’essai pour la vérification de la conformité aux exigences du présent document sont également spécifiés.
Baker in bakrove zlitine - Palice za prosto strojno obdelavo
Ta evropski standard določa sestavo, zahteve za lastnosti in odstopanja glede mer za palice iz bakrovih zlitin v obliki krogov, kvadratov, heksagonov ali oktagonov, končno izdelane z vlečenjem ali ekstrudiranjem ter zlasti namenjene za prosto strojno obdelavo.
Določeni so tudi postopki vzorčenja in preskusne metode za preverjanje skladnosti z zahtevami tega evropskega standarda.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2024
Baker in bakrove zlitine - Palice za prosto strojno obdelavo
Copper and copper alloys - Rod for free machining purposes
Kupfer und Kupferlegierungen - Stangen für die spanende Bearbeitung
Cuivre et alliages de cuivre - Barres pour décolletage
Ta slovenski standard je istoveten z: EN 12164:2024
ICS:
77.150.30 Bakreni izdelki Copper products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12164
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 77.150.30 Supersedes EN 12164:2016
English Version
Copper and copper alloys - Rod for free machining
purposes
Cuivre et alliages de cuivre - Barres pour décolletage Kupfer und Kupferlegierungen - Stangen für die
spanende Bearbeitung
This European Standard was approved by CEN on 19 August 2024.
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12164:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Designations. 8
4.1 Material . 8
4.1.1 General . 8
4.1.2 Symbol . 8
4.1.3 Number . 8
4.2 Material condition . 8
4.3 Product . 8
5 Ordering information . 10
6 Requirements . 11
6.1 Composition . 11
6.2 Mechanical properties . 11
6.3 Resistance to dezincification . 11
6.4 Residual stress level . 12
6.5 Dimensions and tolerances . 12
6.5.1 Diameter or width across-flats . 12
6.5.2 Shape tolerances . 12
6.5.3 Straightness . 12
6.5.4 Length . 13
6.5.5 Corner radii . 13
6.5.6 Twist of polygonal rod . 13
6.5.7 Shaped ends . 14
6.6 Surface quality. 15
6.7 Internal inclusion . 16
7 Sampling . 16
7.1 General . 16
7.2 Analysis . 16
7.3 Mechanical tests . 16
7.4 Dezincification resistance and stress corrosion resistance tests . 16
8 Test methods . 17
8.1 Analysis . 17
8.2 Tensile test . 17
8.2.1 General . 17
8.2.2 Location of test pieces . 17
8.2.3 Shape and size of test pieces . 17
8.2.4 Procedure for testing . 17
8.2.5 Determination of results . 17
8.3 Hardness test . 18
8.4 Dezincification resistance test . 18
8.5 Stress corrosion resistance test . 18
8.6 Determination of the electrical conductivity . 18
8.7 Retests . 18
8.7.1 Analysis, tensile test, hardness test and dezincification resistance test,
determination of the electrical conductivity . 18
8.7.2 Stress corrosion resistance test . 19
8.8 Rounding of results . 19
9 Certificate of compliance and inspection documentation . 19
9.1 Certificate of compliance . 19
9.2 Inspection documentation . 19
10 Marking, packaging, labelling . 19
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure equipment Directive) aimed to be
covered . 43
Bibliography . 44
European foreword
This document (EN 12164:2024) 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 April 2025, and conflicting national standards shall be
withdrawn at the latest by April 2025.
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 12164:2016.
In comparison with EN 12164:2016, the following significant technical changes were made:
a) Introduction of eddy current test parameters in 6.6;
b) Introduction of 6.7 Internal inclusion;
c) Modification of shape and size of test pieces for Tensile test;
d) Modification of the definition of diameter or width across-flats in 6.5.1;
e) Addition of a new Figure for straightness at 6.5.3 and modification of description of straightness
measurement in Table 18;
f) Introduction in the chemical composition Tables of a footnote to explain the meaning of elements for
which no upper and lower limits are specified;
g) Deletion of alloys groups in Table 7;
h) Addition of CuSi4Zn4MnP (CW245E) and CuSi4Zn9MnP (CW246E) in the new Table 3 and new
Table 10;
i) Modification of the chemical composition of CuZn39Pb3 (CW614N), CuZn40Pb2 (CW617N),
CuZn35Pb1,5AlAs (CW625N) and CuZn33Pb1,5AlAs (CW626N) in Table 7;
j) Addition of a new alloy CuZn40Pb1 (CW627N) in Table 7 and Table 14;
k) Modification of the chemical composition of CuZn33Pb1AlSiAs (CW725R) in Table 8;
l) Addition of CuNi12Zn38Mn5Pb2 (CW407J) in Table 4 and Table 11;
m) Addition of a new alloy CuZn36Si1P (CW726R) in Table 8 and Table 15;
n) Modification of the range of width across-flats for CuZn21Si3P (CW724R) in Table 15;
o) Addition of Table 23 and Table 24;
p) Addition of Annex ZA.
This document is one of a series of European Standards for the copper and copper alloy products rod,
wire, profile and forgings. Other products are specified as follows:
— EN 12163, Copper and copper alloys — Rod for general purposes;
— EN 12165, Copper and copper alloys — Wrought and unwrought forging stock;
— EN 12166, Copper and copper alloys — Wire for general purposes;
— EN 12167, Copper and copper alloys — Profiles and bars for general purposes;
— EN 12168, Copper and copper alloys — Hollow rod for free machining purposes;
— EN 13601, Copper and copper alloys — Copper rod, bar and wire for general electrical purposes;
— EN 13602, Copper and copper alloys — Drawn, round copper wire for the manufacture of electrical
conductors;
— EN 13605, Copper and copper alloys — Copper profiles and profiled wire for electrical purposes.
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.
Introduction
The European Committee for Standardization (CEN) draws attention to the fact that it is claimed that
compliance with this document may involve the use of a patent concerning the alloys
CuSi4Zn4MnP (CW245E), CuSi4Zn9MnP (CW246E) and CuZn36Si1P (CW726R) given in 6.1.
CEN takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has ensured the CEN that he is willing to negotiate licenses either free of
charge or under reasonable and non-discriminatory terms and conditions with applicants throughout the
world. In this respect, the statement of the holder of this patent right is registered with CEN.
— For CuSi4Zn4MnP (CW245E) and CuSi4Zn9MnP (CW246E) information may be obtained from:
Viega Technology GmbH & Co. KG
Viega Platz 1
57439 Attendorn
GERMANY
— For CuZn36Si1P (CW726R) information may be obtained from:
Luvata Oy
Kuparitie 5
28330 Pori
FINLAND
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights other than those identified above. CEN shall not be held responsible for identifying any or
all such patent rights.
CEN and CENELEC maintain online lists of patents relevant to their standards. Users are encouraged to
consult the lists for the most up to date information concerning patents
(https://www.cencenelec.eu/european-standardization/ipr-and-patents/patents/).
Due to developing legislation, the composition of a material may be restricted to the composition
specified in this European Standard with respect to individual uses (e.g. for the use in contact with
drinking water in some Member States of the European Union). These individual restrictions are not part
of this European Standard. Nevertheless, for materials for which traditional and major uses are affected,
these restrictions are indicated. The absence of an indication, however, does not imply that the material
can be used in any application without any legal restriction.
1 Scope
This document specifies the composition, property requirements and dimensional tolerances for copper
alloy rod, in the shape of circles, squares, hexagons or octagons, finally produced by drawing or extruding,
especially intended for free machining purposes.
The sampling procedures and the methods of test 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 764-5:2014, Pressure equipment - Part 5: Inspection documentation of metallic materials and
compliance with the material specification
EN 10204:2004, Metallic products - Types of inspection documents
EN 14977:2006, Copper and copper alloys - Detection of tensile stress - 5 % ammonia test
EN 17263:2019, Copper and copper alloys - Eddy current testing on the outer surface of rods, bars, hollow
rods and wires for the detection of defects by encircling test coil
EN ISO 6506-1:2014, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2014)
EN ISO 6509-1:2014, Corrosion of metals and alloys - Determination of dezincification resistance of copper
alloys with zinc - Part 1: Test method (ISO 6509-1:2014)
EN ISO 6892-1:2019, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO
6892-1:2019)
ISO 6957:1988, Copper alloys — Ammonia test for stress corrosion resistance
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
rod
straight product of uniform cross-section along its whole length
[SOURCE: EN 12163:2016, 3.1]
3.2
deviation from circular form
difference between the maximum and the minimum diameters measured at any one cross-section of a
round product
4 Designations
4.1 Material
4.1.1 General
The material is designated either by symbol or by number (see Tables 2 to 8).
4.1.2 Symbol
The material symbol designation is based on the designation system given in ISO 1190-1:1982.
NOTE Although material symbol designations used in this standard might be the same as those in other
standards using the designation system given in ISO 1190-1:1982, 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 1412:2016.
4.2 Material condition
For the purposes of this standard, the following designations, which are in accordance with the system
given in EN 1173:2008, apply for the material condition:
M material condition for the product as manufactured, without specified mechanical properties;
R. material condition designated by the minimum value of tensile strength requirement for the
product with mandatory tensile property requirements;
H. material condition designated by the minimum value of hardness requirement for the product
with mandatory hardness requirements;
S (suffix) material condition for a product which is stress relieved.
Products in the M, R… or H… condition may be specially processed (i.e. mechanically or thermally stress
relieved) in order to lower the residual stress level to improve the resistance to stress corrosion and the
dimensional stability on machining [see Clause 5, list entry m), list entry n) and 8.5].
Exact conversion between material conditions designated R. and H. is not possible.
Except when the suffix S is used, material condition is designated by only one of the above designations.
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 standard.
The product designation for products to this standard shall consist of:
— denomination (Rod);
— number of this European Standard (EN 12164);
— material designation, either symbol or number (see Tables 2 to 8);
— DW for compliance in the chemical composition according to the 4 MS Common Composition List.
This information is mandatory in the case in which the product is used for drinking water
applications according to the 4 MS Common Composition List and not to be given in other cases (see
Bibliography [5]);
— material condition designation (see Tables 9 to 15);
— cross-sectional shape (the following designations shall be used, as appropriate: RND for round, SQR
for square, HEX for hexagonal, OCT for octagonal);
— nominal cross-sectional dimension (diameter or width across-flats);
— for round rod, the tolerance class (see Table 16);
— for square, hexagonal or octagonal rod, the corner shape (the following designations shall be used as
appropriate: SH for sharp, RD for rounded) (see Table 20).
The derivation of a product designation is shown in the following examples.
EXAMPLE 1 Rod for free machining purposes conforming to this standard, in material designated either
CuZn40Pb2 or CW617N, for standard applications, in material condition R430, round cross-section, nominal
diameter 30 mm, tolerance Class A, will be designated as follows:
EXAMPLE 2 Rod for free machining purposes conforming to this standard, in material designated either
CuZn40Pb2 or CW617N, for drinking water applications according to the 4 MS Common Composition List, in
material condition R430, round cross-section, nominal diameter 30 mm, tolerance Class A, will be designated as
follows:
5 Ordering information
In order to facilitate the enquiry, order and confirmation of order procedures the following information
shall be specified:
a) mass of product required;
b) denomination (Rod);
c) number of this European Standard (EN 12164);
d) material designation (see Tables 2 to 8);
e) material condition designation (see 4.2 and Tables 9 to 15) if it is other than M;
f) DW for compliance in the chemical composition according to the 4 MS Common Composition List.
This information is mandatory in the case in which the product is used for drinking water
applications according to the 4 MS Common Composition List and not to be given in other cases;
g) cross-sectional shape;
h) nominal cross-sectional dimension (diameter or width across-flats);
i) for round rod up to and including 30 mm diameter, whether Class A or Class B tolerances are
required, unless the tolerance class shall be left to the discretion of the supplier (see Table 16);
j) for rod with square, hexagonal and octagonal cross-section, whether “sharp” or “rounded” corners
are required unless the corner radii of the rod shall be left to the discretion of the supplier (see 6.5.5
and Table 20);
k) length of product required. Normally rod is supplied to “nominal length” tolerances (see Table 19).
If “fixed lengths” are required, the length and tolerance shall be stated (see 6.5.4).
It is recommended that the product designation, as described in 4.3, is used for items b) to k).
In addition, it shall also state on the enquiry and order any of the following, if required:
l) whether the products according to 6.3, are required to pass a dezincification resistance test (see 8.4)
m) whether the products are required to pass a stress corrosion resistance test. If so which test method
shall be used (see 8.5), if the choice is not to be left to the discretion of the supplier;
n) whether the products shall be supplied in a thermally stress relieved material condition;
o) whether the products shall be supplied with shaped ends which are different from those specified in
6.5.7;
p) whether special surface quality is required (see 6.6);
q) whether surface quality test is required (see 6.6) and the class;
r) whether a certificate of compliance is required (see 9.1);
s) whether an inspection document is required, and if so, which type (see 9.2);
t) whether there are any special requirements for marking, packaging or labelling (see Clause 10).
EXAMPLE Ordering details for 500 kg rod for free machining purposes conforming to EN 12164, in material
designated either CuZn40Pb2 or CW617N, for drinking water application according to the 4 MS Common
Composition List, in material condition R430, round cross-section, nominal diameter 30 mm, tolerance Class A,
nominal length 3 000 mm:
500 kg Rod — CuZn40Pb2 — DW — R430 — RND30A
EN 12164
— nominal length 3 000 mm
or
500 kg Rod — CW617N — DW — R430 — RND30A
EN 12164
— nominal length 3 000 mm
6 Requirements
6.1 Composition
The composition shall conform to the requirements for the appropriate material given in Tables 2 to 8.
Due to developing legislation, specific applications (see 4.3) may require restrictions in the chemical
composition. In this case the limitations shall be specified in the ordering information (see Clause 5 list
entry f)).
6.2 Mechanical properties
The tensile or the hardness properties shall conform to the appropriate requirements given in Tables 9
to 15. The tests shall be carried out in accordance with 8.2 or 8.3.
6.3 Resistance to dezincification
This requirement only applies to materials that are declared resistant to dezincification.
The maximum depth of dezincification, in any direction, of CuZn38As (CW511L), CuZn36Pb2As
(CW602N), CuZn32Pb2AsFeSi (CW709R), CuZn21Si3P (CW724R) and CuZn33Pb1AlSiAs (CW725R)
products shall not exceed 100 µm. For the alloys CuZn35Pb1,5AlAs (CW625N), CuZn33Pb1,5AlAs
(CW626N) the maximum depth of dezincification, in any direction, shall not exceed 200 µm.
The test shall be carried out in accordance with 8.4.
NOTE Shape and distribution of beta phase aggregates can influence the dezincification resistance of products.
Special requirements relating to shape and distribution of ß phase aggregates are subject to agreement between the
involved parties.
Products in alloys other than CuZn21Si3P (CW724R) shall be subjected to heat treatment approximately
in the range 500 °C to 550 °C.
Should the user need to heat the material out of the range before specified (i.e. soldering, brazing or
welding operations) then advice should be sought from the supplier.
6.4 Residual stress level
Products ordered and supplied in the stress relieved condition (see 4.2, 2nd paragraph) shall show no
evidence of cracking if tested. The tests shall be carried out in accordance with 8.5.
6.5 Dimensions and tolerances
6.5.1 Diameter or width across-flats
Diameter or width across-flats at any point shall conform to the tolerances given in Tables 16 or 17.
6.5.2 Shape tolerances
6.5.2.1 Round rod
The deviation from circular form (see 3.2) shall not exceed half the range of the tolerance on diameter
specified in Table 16.
6.5.2.2 Rod with square, hexagonal or octagonal cross-section (see above)
The width across-flats, measured at the centre of the faces at any one cross-section, shall not differ by
more than half the range of the tolerance given for the size in Table 17.
6.5.3 Straightness
For rod of diameter, or width across-flats, from 10 mm up to and including 50 mm, and of length
1 000 mm or over, the deviation from straightness, defined as the curvature (depth of arc) against a
datum line when the product is lying flat in a horizontal plane (see Figure 1), shall conform to the
tolerances given in Table 18.
NOTE Outside this size range, the deviation from straightness is subject to agreement between the involved
parties.
Dimensions in millimetres
Key
h depth of arc in any length l of 1000
1 1
h depth of arc in any length l of 400
2 2
Figure 1 — Measurement of straightness
6.5.4 Length
Products shall be supplied as “nominal lengths” unless “fixed lengths” are specifically ordered (see
NOTE).
“Nominal lengths” are supplied in the preferred lengths given in Table 19 and shall conform to the
tolerances given in the table.
Subject to agreement between the involved parties, an agreed proportion of underlength rod may be
included in a consignment of “nominal lengths” rod.
NOTE The length and the length tolerances of “fixed lengths” rod are subject to agreement between the
involved parties [see Clause 5 list entry k)].
6.5.5 Corner radii
The corner radii of rod with square, hexagonal or octagonal cross-section shall conform to Table 20
[see Clause 5 list entry j)].
Except in cases of dispute, the corners should be measured directly, either by use of a gauge or an optical
projector. In cases of dispute, the method by optical projector should be used.
6.5.6 Twist of polygonal rod
The maximum permitted twist V (see Figure 2) of rod with square, hexagonal or octagonal cross-section,
as measured between two cross-sections along the rod, shall conform to Table 21.
Key
1 reference plane
V twist
W width across-flats
Figure 2 — Measurement of twist of polygonal rod
6.5.7 Shaped ends
Unless otherwise specified at the time of the order, products of sizes 2 mm up to and including 30 mm
diameter, or width across-flats, shall be supplied with one end chamfered (Type A in Table 1) and the
other end pointed (Type B in Table 1).
The length of chamfer/point is shown in Figure 3.
a) Shaped ends of rod, Type A – chamfered
b) Shaped ends of rod, Type B – pointed
Figure 3 — Shaped ends of rod, Types
Table 1 — Indicative shaped ends dimensions
Dimensions in millimetres
a b
Nominal diameter D
Type A – Chamfer Type B – Point
or width across-flats W
Length L Length L
up to and
over min. max. min. max.
including
2 5 0,2 1,0 1,5 4
5 10 0,2 1,5 2 7
10 20 0,2 2 3 10
20 30 0,2 3 4 12
a
Chamfering is applied to remove any burrs.
b
Pointing is applied to guide rods through automatic feeding machines.
Unless otherwise specified at the time of the order the shape of the ends of products of sizes over 30 mm
diameter, or width across-flats, shall be at the supplier's discretion.
Other end shapes than those specified shall be agreed with the supplier at the time of order and stated in
the enquiry and order [see Clause 5 list entry o)].
6.6 Surface quality
The surfaces shall be clean and smooth. The rods may have a superficial film of drawing lubricant or, if
annealed or thermally stress relieved, a superficial, dull, iridescent oxide film, securely adherent on the
surfaces.
Discontinuous irregularities on the surfaces of the rods are permitted if they are within the dimensional
tolerances.
Since surface discontinuities (cracks, overlapping, scale, isolated pores, pits, grooves, etc.) cannot be
completely avoided during manufacturing (hot and cold formation, heat treatments, handling and
storage) and since they are retained when drawing, agreements shall be made regarding surface quality.
If eddy current test is requested, the test method given in EN 17263:2019 shall be applied using reference
standard according to Table 23 for round rod. For polygonal rod the reference standard shall be agreed
between the involved parties.
The sensitivity is to be set in such a way that the smallest signal of the borehole(s) just exceeds the
response threshold (acceptance level).
The surface quality of the products shall be one of the classes according to Table 24 for round rod. where:
K = ratio of the signal for the lower detection threshold to the signal for the normal detection
threshold (normal acceptance level)
d = a maximum density of defects referred to a pre-set length of 300 mm (L )
0 0
% of sensitivity = percentage of acceptance level
For polygonal rod the above-mentioned parameters shall be agreed between the involved parties.
If single rods are tested unexamined ends exist.
Other surface control methods can be used by agreement between the involved parties.
Special requirements (e.g. pickling, degreasing, etc.) relating to the surface quality shall be agreed
between the involved parties [see Clause 5, list entry p)].
6.7 Internal inclusion
Freedom of internal inclusions cannot be ensured in any copper alloys.
7 Sampling
7.1 General
When required or for use in cases of dispute, an inspection lot shall be sampled in accordance with 7.2 to
7.4.
7.2 Analysis
The sampling rate shall be in accordance with Table 22. 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 the test
sample. 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 manufacturer can ensure the traceability of
the product.
7.3 Mechanical tests
The sampling rate shall be in accordance with Table 22. 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.
7.4 Dezincification resistance and stress corrosion resistance tests
The sampling rate which shall be applied to finished products, shall be:
— for products that have been heat treated: one sampling unit per heat treatment batch;
— for products that have not been heat treated: in accordance with Table 22.
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 at the discretion
of the supplier. In case of dispute the methods of analysis to be used shall be agreed between the disputing
parties. For expression of results, the rounding rules given in 8.8 shall be used.
8.2 Tensile test
8.2.1 General
Tensile test pieces shall be prepared in accordance with 8.2.2 and 8.2.3 and the test shall be carried out
in accordance with 8.2.4.
8.2.2 Location of test pieces
Test pieces shall be machined from one of the following locations in the test sample obtained in
accordance with 7.3:
a) for test samples from products up to and including 30 mm diameter, or width across-flats, the test
piece shall be coaxial with the product;
b) for test samples from products over 30 mm diameter, or width across-flats, the longitudinal axis of
the test piece shall be parallel to that of the product and shall be between 15 mm and 20 mm from
the surface of the product.
8.2.3 Shape and size of test pieces
Test pieces shall be in accordance with EN ISO 6892-1:2019, except that 200 mm gauge length is not
permitted.
Elongation requirements for rod of diameter or width across-flats:
a) less than 4 mm (A100 mm);
b) 4 mm up to and including 8 mm (A );
11,3
c) greater than 8 mm (A);
S S
are based on original gauge lengths of 100 mm, 11,3 mm and 5,65 mm respectively, where S
o o o
is the original cross-sectional area of the test piece in square millimetres.
8.2.4 Procedure for testing
The tensile test shall be carried out in accordance with the method given in EN ISO 6892-1:2019.
8.2.5 Determination of results
The tensile strength, 0,2 % proof strength and the elongation shall be determined from the tensile test
results obtained in accordance with 8.2.4. For expression of results the rounding rules given in 8.8 shall
be used.
8.3 Hardness test
Hardness shall be determined on the test piece cut from the test sample obtained in accordance with 7.3.
The test shall be carried out in accordance with EN ISO 6506-1:2014.
The position of the impression/indentation shall be:
a) for rod of diameter or width across-flats less than 5 mm upon agreement between the involved
parties;
b) for rod of diameter or width across-flats greater (equal) than 5 mm on the cross-section of the
product mid-way between the central axis and the outside surface.
8.4 Dezincification resistance test
The test method given in EN ISO 6509-1:2014 shall be used on the test samples obtained in accordance
with 7.4 [see Clause 5 list entry l)].
A test piece shall be taken from each test sample so as to expose a prepared cross-sectional surface to the
test solution.
At the completion of the test the maximum depth of dezincification in a longitudinal direction shall be
measured.
8.5 Stress corrosion resistance test
The test method given in either ISO 6957:1988 (using pH 10,0) or EN 14977:2006 shall be used on the
test pieces prepared from the test samples obtained in accordance with 7.4. The choice of which of these
tests is used shall be at the discretion of the supplier, unless a preference is agreed at the time of the order
[see Clause 5 list entry m)].
8.6 Determination of the electrical conductivity
If not otherwise specified the test method is left to the discretion of the supplier, e.g. eddy current method
or resistance bridge.
The electrical conductivity shall be determined on the finished product.
8.7 Retests
8.7.1 Analysis, tensile test, hardness test and dezincification resistance test, determination of
the electrical conductivity
If there is a failure of one, or more than one, of the tests in 8.1, 8.2, 8.3, 8.4 or 8.6, two test samples from
the same inspection lot shall be permitted to be selected for retesting the failed property (properties).
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 conform to the particular requirement(s) of this standard. If a test piece fails a test,
the inspection lot represented shall be deemed not to conform to this standard.
NOTE If an inspection lot of dezincification resistant alloys fails the dezincification resistance test when tested
or retested, the supplier has the option to heat treat, or to further heat treat, the inspection lot and resubmit it for
all the tests called for on the order, except for analysis.
8.7.2 Stress corrosion resistance test
If a test piece fails the test, the inspection lot represented by the failed test piece shall be permitted to be
subjected to a stress relieving treatment. A further test sample shall then be selected in accordance with
7.4.
If a test piece from the further test sample passes the test, the stress relieved products shall be deemed
to conform to the requirements of this standard for residual stress level and shall then be subjected to all
the other tests called for on the order, except for analysis. If the test piece from the further test sample
fails the test, the stress relieved products shall be deemed not to conform to this standard.
8.8 Rounding of results
For the purpose of determining conformity to the limits specified in this standard an observed or a
calculated value obtained from a test shall be rounded in accordance with the following procedure, which
is based upon the guidance given in EN ISO 80000-1. It shall be rounded in one step to the same number
of figures used to express the specified limit in this European Standard. Except for tensile strength and
2 1)
0,2 % proof strength the rounding interval shall be 10 N/mm and for elongation the value shall be
rounded to the nearest 1 %.
The following rules shall be used for rounding:
a) if the figure immediately after the last figure to be retained is less than 5, the last figure to be retained
shall be kept unchanged;
b) if the figure immediately after the last figure to be retained is equal to or greater than 5, the last figure
to be retained shall be increased by one.
9 Certificate of compliance and inspection documentation
9.1 Certificate of compliance
When requested and agreed at the time of the order [see Clause 5 list entry r)], the appropriate certificate
of compliance shall be issued for the products.
NOTE The relevant information is available in EN ISO/IEC 17050-1:2010 and EN ISO/IEC 17050-2:2004.
9.2 Inspection documentation
When requested and agreed at the time of the order [(see Clause 5 list
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