oSIST prEN 12168:2022
(Main)Copper and copper alloys - Hollow rod for free machining purposes
Copper and copper alloys - Hollow rod for free machining purposes
This European Standard specifies the composition, property requirements and dimensional tolerances for copper alloy hollow rod, finally produced by drawing or extruding, specifically intended for free machining purposes.
NOTE Hollow products having an outside diameter greater than 80 mm and/or a wall thickness less than 2 mm are specified in EN 12449.
The sampling procedures, the methods of test for verification of conformity to the requirements of this European Standard, are also specified.
Kupfer und Kupferlegierungen - Hohlstangen für die spanende Bearbeitung
Dieses Dokument legt die Zusammensetzung, die Anforderungen an die Eigenschaften und die Grenzabmaße für durch Ziehen oder Pressen endgefertigte Hohlstangen aus Kupferlegierungen für die spanende Bearbeitung fest.
ANMERKUNG Viele Hohlstangen mit einem Außendurchmesser über 80mm und/oder einer Wanddicke unter 2mm sind in EN12449 festgelegt.
Der Ablauf der Probenahme und die Prüfverfahren zur Feststellung der Übereinstimmung mit den Anforde
rungen dieses Dokuments sind ebenfalls festgelegt.
Cuivre et alliages de cuivre - Barres creuses pour décolletage
Le présent document spécifie la composition, les exigences de propriétés et les tolérances dimensionnelles des barres creuses en alliage de cuivre, fabriquées par étirage ou filage, spécifiquement destinées au décolletage.
NOTE Les produits creux de diamètre extérieur supérieur à 80 mm et/ou ayant une épaisseur de paroi inférieure à 2 mm sont le plus souvent spécifiés conformément à l’EN 12449.
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 - Votle palice za obdelavo z odrezovanjem na avtomatih
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 12168:2022
01-oktober-2022
Baker in bakrove zlitine - Votle palice za obdelavo z odrezovanjem na avtomatih
Copper and copper alloys - Hollow rod for free machining purposes
Kupfer und Kupferlegierungen - Hohlstangen für die spanende Bearbeitung
Cuivre et alliages de cuivre - Barres creuses pour décolletage
Ta slovenski standard je istoveten z: prEN 12168
ICS:
77.150.30 Bakreni izdelki Copper products
oSIST prEN 12168:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 12168:2022
DRAFT
EUROPEAN STANDARD
prEN 12168
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2022
ICS 77.150.30 Will supersede EN 12168:2016
English Version
Copper and copper alloys - Hollow rod for free machining
purposes
Cuivre et alliages de cuivre ¿ Barres creuses pour Kupfer und Kupferlegierungen - Hohlstangen für die
décolletage spanende Bearbeitung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 133.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12168:2022 E
worldwide for CEN national Members.
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Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Designations. 9
4.1 Material . 9
4.1.1 General . 9
4.1.2 Symbol . 9
4.1.3 Number . 9
4.2 Material condition . 9
4.3 Product . 10
5 Ordering information . 13
6 Requirements . 14
6.1 Composition . 14
6.2 Mechanical properties . 14
6.3 Resistance to dezincification . 14
6.4 Residual stress level . 15
6.5 Dimensions and tolerances . 15
6.5.1 Diameter or width across-flats . 15
6.5.2 Tolerance on wall thickness . 15
6.5.3 Eccentricity . 15
6.5.4 Shape tolerances . 15
6.5.5 Straightness . 15
6.5.6 Length . 16
6.5.7 Corner radii . 16
6.5.8 Twist of polygonal hollow rod . 16
6.6 Surface quality. 17
6.7 Internal inclusion . 17
7 Sampling . 17
7.1 General . 17
7.2 Analysis . 17
7.3 Mechanical tests . 18
7.4 Dezincification resistance and stress corrosion resistance tests . 18
8 Test methods . 18
8.1 Analysis . 18
8.2 Tensile test . 18
8.2.1 General . 18
8.2.2 Location of test pieces . 18
8.2.3 Shape and size of test pieces . 19
8.2.4 Procedure for testing . 19
8.2.5 Determination of results . 19
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8.3 Hardness test . 19
8.4 Dezincification resistance test . 19
8.5 Stress corrosion resistance test . 19
8.6 Retests . 19
8.6.1 Analysis, tensile, hardness and dezincification resistance tests . 19
8.6.2 Stress corrosion resistance test . 20
8.7 Rounding of results . 20
9 Declaration of conformity and inspection documentation . 20
9.1 Declaration of conformity . 20
9.2 Inspection documentation . 20
10 Marking, packaging, labelling . 21
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure equipment Directive) aimed to be
covered . 37
Bibliography . 38
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European foreword
This document (prEN 12168:2022) has been prepared by Technical Committee CEN/TC 133 “Copper and
copper alloys”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12168:2016.
In comparison with EN 12168:2016, the following significant technical changes were made:
a) Modified the note in Clause 1;
b) Introduction in 6.6 of eddy current test parameters;
c) Introduction of 6.7 Internal inclusion;
d) Modified the definition of diameter or width across-flats at 6.5.4.1;
e) Added a new Figure for straightness at 6.5.5 and modified values in Table 13;
f) Introduction in the chemical composition Tables of a footnote to explain the meaning of elements for
which no upper and lower limits are defined;
g) Deleted alloys groups in Table 3;
h) Chemical composition of CuZn39Pb3 (CW614N), CuZn40Pb2 (CW617N), CuZn35Pb1,5AlAs
(CW625N) and CuZn33Pb1,5AlAs (CW626N) modified in Table 3;
i) Added a new alloy CuZn40Pb1 (CW627N) in Table 6 and Table 7;
j) Chemical composition of CuZn33Pb1AlSiAs (CW725R) modified in Table 4;
k) Added a new alloy CuZn36Si1P (CW726R) in Table 4 and Table 8
l) Modified the range of dimensions in Table 9 and in Table 11;
m) Table 18 and Table 19 added;
n) Annex ZA added.
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 12164, Copper and copper alloys — Rod for free machining 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;
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— 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 given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
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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 alloy CuZn33Pb1AlSiAs
(CW725R) 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 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 CuZn33Pb1AlSiAs (CW725R) information may be obtained from:
Diehl Brass Solutions Stiftung & Co. KG
Heinrich-Diehl-Straße 9
D-90552 Röthenbach/Pegnitz
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
(ftp://ftp.cencenelec.eu/EN/IPR/Patents/IPRdeclaration.pdf).
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.
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1 Scope
This document specifies the composition, property requirements and dimensional tolerances for copper
alloy hollow rod, finally produced by drawing or extruding, specifically intended for free machining
purposes.
NOTE Hollow products having an outside diameter greater than 80 mm and/or a wall thickness less than 2 mm
are most frequently specified in EN 12449.
The sampling procedures, 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 1173:2008, Copper and copper alloys - Material condition designation
EN 1412:2016, Copper and copper alloys - European numbering system
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 6507-1:2018, Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2018)
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 1190-1:1982, Copper and copper alloys — Code of designation — Part 1: Designation of materials
ISO 6957:1988, Copper alloys — Ammonia test for stress corrosion resistance
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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:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
hollow rod
straight product, of uniform cross-section along its whole length with an enclosed void for which the
longitudinal axes of its external contour and its internal contour, which is the boundary with the enclosed
void, are coincidental
Note 1 to entry: The external and internal contours of the rod, at any cross-section, can be that of a circle, square,
rectangle, hexagon, or octagon, or with slight modification of those basic shapes by inclusion of detail(s) of relatively
small size to the remainder of the cross-section. Examples of hollow rod cross-sections are shown in Figure 1.
Figure 1 — Examples of hollow rod cross-sections
3.2
deviation from circular form
difference between the maximum and the minimum outside diameters measured at any one cross-section
of the product
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3.3
eccentricity
difference between the maximum and the minimum wall thickness, measured in the same cross-section
perpendicular to the axis of the hollow rod, expressed as a percentage of the sum of the maximum and
minimum wall thicknesses (s and s ):
max. min.
ss−
max. min.
e ×100
ss+
max. min.
Note 1 to entry: For polygons, wall thickness is measured perpendicular to the mid-points of the flat outside
surfaces.
4 Designations
4.1 Material
4.1.1 General
The material is designated either by symbol or by number (see Tables 1 to 4).
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 document, 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 or H. material 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 k), list entry l) and 8.5].
Except when the suffix S is used, material condition is designated by only one of the above designations.
9
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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 document.
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 (hollow rod);
b) number of this European Standard (EN 12168);
c) material designation, either symbol or number (see Tables 1 to 4);
d) 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;
e) material condition designation (see Tables 5 to 8);
f) external and/or internal cross-sectional shape (the following designations shall be used as
appropriate: RND for round, SQR for square, RCT for rectangular, HEX for hexagonal, OCT for
octagonal, PFL for profile);
g) nominal cross-sectional dimensions (see Clause 5, list entry g)) or, for profiles, the number of the
profile or a fully dimensioned and toleranced drawing, and:
1) tolerance class A, B or C added to the external dimension (see Table 9); and/or
2) tolerance class A or B added to the bore diameter (see Table 11);
h) wall thickness (the following designation shall be used for wall thickness: WT) (see Table 10);
i) for square, hexagonal or octagonal external shape, the corner shape (the following designations shall
be used as appropriate: SH for sharp, RD for rounded) (see Table 15).
A typical product designation is shown in the following examples.
EXAMPLE 1 Hollow rod for free machining purposes conforming to this document, in material designated either
CuZn40Pb2 or CW617N, for standard applications, in material condition H090, round external shape and bore,
nominal outside diameter 40 mm, tolerance Class B, and nominal wall thickness 10 mm will be designated as
follows:
10
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EXAMPLE 2 Hollow rod for free machining purposes conforming to this document, in material designated either
CuZn40Pb2 or CW617N, for drinking water applications according to the 4 MS Common Composition List, in
material condition H090, round external shape and bore, nominal outside diameter 40 mm, tolerance Class B, and
nominal wall thickness 10 mm will be designated as follows:
EXAMPLE 3 Hollow rod for free machining purposes conforming to this document, in material designated either
CuZn40Pb2 or CW617N, for standard applications, in material condition H090, hexagonal external shape, 60 mm
nominal width across-flats dimension, tolerance Class A, round bore of nominal diameter 20 mm, tolerance Class B
sharp corners, will be designated as follows:
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EXAMPLE 4 Hollow rod for free machining purposes conforming to this document, in material designated either
CuZn40Pb2 or CW617N, for drinking water applications according to the 4 MS Common Composition List, in
material condition H090, hexagonal external shape, 60 mm nominal width across-flats dimension, tolerance Class A,
round bore of nominal diameter 20 mm, tolerance Class B sharp corners, will be designated as follows:
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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) mass of product required;
b) denomination (hollow rod);
c) number of this document (EN 12168);
d) material designation (see Tables 1 to 4);
e) material condition designation (see 4.2 and Tables 5 to 8) 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) nominal cross-sectional dimensions or, in the case of hollow profiles, by a fully dimensioned and
toleranced drawing:
To define the nominal cross-sectional dimensions of a hollow rod, a purchaser should state one of
the following:
1) the external dimensions and the wall thickness (tolerances given in Tables 9 and 10); or
2) the internal dimensions and the wall thickness (tolerances given in Tables 11 and 10); or
3) the external and internal dimensions (tolerances given in Tables 9 and 11) and the maximum
eccentricity (tolerances given in Table 12); or
h) whether:
1) class A, B or C tolerances shall apply to external dimensions (see Table 9); and/or
2) class A or B tolerances shall apply to internal dimensions (see Table 11); unless the choice of
these tolerance classes is left to the discretion of the supplier;
i) for hollow rod having a square, hexagonal or octagonal external shape, whether “sharp” or “rounded”
corners are required unless the corner radii of the rod are left to the discretion of the supplier
(see 6.5.7 and Table 13);
j) length of product required. Normally hollow rod is supplied to “nominal length” tolerances (see 6.5.6
and Table 14);
It is recommended that the product designation, as described in 4.3, is used for items b) to j).
In addition, the purchaser shall also state on the enquiry and order any of the following, if required:
k) 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 left to the discretion of the supplier.
l) whether the products shall be supplied in a thermally stress relieved material condition;
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m) whether special surface quality is required (see 6.6);
n) whether surface quality test is required (see 6.6) and the class;
o) whether a declaration of conformity is required (see 9.1);
p) whether an inspection document is required, and if so, which type (see 9.2);
q) whether there are any special requirements for marking, packaging or labelling (see Clause 10).
EXAMPLE Ordering details for 1 000 kg of hollow rod for free machining purposes conforming to EN 12168,
in material designated either CuZn40Pb2 or CW617N, for drinking water application according to the 4 MS Common
Composition List, in material condition H090, round external shape, nominal outside diameter 40 mm, tolerance
class B, and nominal wall thickness 10 mm, tolerance class A, nominal length 3 000 mm:
1 000 kg Hollow rod — CuZn40Pb2 — DW — H090 — RND40B × WT10A
EN 12168
— nominal length 3 000 mm
or
1 000 kg Hollow rod — CW617N — DW — H090 — R
...
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