oSIST prEN 12420:2022
(Main)Copper and copper alloys - Forgings
Copper and copper alloys - Forgings
This European Standard specifies the composition, the property requirements and tolerances on dimensions and form for copper and copper alloy die and hand forgings.
The sampling procedures, the methods of test for verification of conformity to the requirements of this standard, and the delivery conditions are also specified.
Kupfer und Kupferlegierungen - Schmiedestücke
Dieses Dokument legt die Zusammensetzung, die Anforderungen an die Eigenschaften und Maß- und Formto
leranzen für Gesenk- und Freiformschmiedestücke aus Kupfer und Kupferlegierungen fest.
Der Ablauf der Probenentnahme, die Prüfverfahren zur Feststellung der Übereinstimmung mit den Anforde
rungen dieses Dokuments und die Lieferbedingungen sind ebenfalls festgelegt.
Cuivre et alliages de cuivre - Pièces forgées
Le présent document spécifie la composition, les exigences de propriétés et les tolérances de dimensions et de forme des pièces forgées par matriçage et des pièces forgées libres en cuivre et alliages de cuivre.
Les modes opératoires d’échantillonnage, les méthodes d’essai pour la vérification de la conformité aux exigences du présent document et les conditions de livraison sont également spécifiés.
Baker in bakrove zlitine - Izkovki
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 12420:2022
01-oktober-2022
Baker in bakrove zlitine - Izkovki
Copper and copper alloys - Forgings
Kupfer und Kupferlegierungen - Schmiedestücke
Cuivre et alliages de cuivre - Pièces forgées
Ta slovenski standard je istoveten z: prEN 12420
ICS:
77.150.30 Bakreni izdelki Copper products
oSIST prEN 12420:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN 12420:2022
---------------------- Page: 2 ----------------------
oSIST prEN 12420:2022
DRAFT
EUROPEAN STANDARD
prEN 12420
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2022
ICS 77.150.30 Will supersede EN 12420:2014
English Version
Copper and copper alloys - Forgings
Cuivre et alliages de cuivre - Pièces forgées Kupfer und Kupferlegierungen - Schmiedestücke
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 12420:2022 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Designations. 7
4.1 Material . 7
4.1.1 General . 7
4.1.2 Symbol . 7
4.1.3 Number . 7
4.2 Material condition . 8
4.3 Product . 8
5 Ordering information . 9
6 Requirements . 10
6.1 Composition . 10
6.2 Mechanical properties . 10
6.2.1 Hardness properties . 10
6.2.2 Tensile properties. 10
6.3 Electrical properties . 11
6.4 Resistance to dezincification . 11
6.5 Residual stress level . 11
6.6 Tolerances for die forgings . 11
6.6.1 General . 11
6.6.2 Tolerances for dimensions within the die cavity and for dimensions across the die
parting line . 12
6.6.3 Mismatch . 13
6.6.4 Flash projection . 13
6.6.5 Ejector marks. 14
6.6.6 Flatness tolerances . 15
6.6.7 Angular tolerances. 15
6.7 Tolerances for cored forgings . 16
6.8 Tolerances for hand forgings . 17
6.8.1 General . 17
6.8.2 Tolerances on dimensions . 17
6.8.3 Flatness tolerance . 18
6.8.4 Surface quality. 18
6.8.5 Drawings . 19
7 Sampling . 19
7.1 General . 19
7.2 Analysis . 19
7.3 Hardness, stress corrosion resistance, dezincification resistance and electrical
property tests . 19
8 Test methods . 20
8.1 Analysis . 20
2
---------------------- Page: 4 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
8.2 Hardness test . 20
8.3 Electrical conductivity test . 20
8.4 Dezincification resistance test . 20
8.5 Stress corrosion resistance test . 20
8.6 Retests . 20
8.6.1 Analysis, hardness, electrical conductivity and dezincification resistance tests . 20
8.6.2 Stress corrosion resistance test . 21
8.7 Rounding of results . 21
9 Declaration of conformity and inspection documentation . 21
9.1 Declaration of conformity . 21
9.2 Inspection documentation . 21
10 Marking, labelling, packaging . 21
Annex A (informative) Recommended guidelines for design . 40
A.1 Introduction. 40
A.2 General information . 40
A.3 Guidelines for die forgings . 41
A.3.1 Drafts . 41
A.3.2 Web thicknesses . 41
A.3.3 Side wall thicknesses . 42
A.3.4 Rib design . 43
A.3.5 Cores . 45
A.3.6 Flash . 46
A.3.7 Transition radii . 47
A.3.8 Clamping lengths and clamping areas for finish machining . 48
A.3.9 Design for cross-sectional shapes . 49
A.3.10 Recommended machining allowances and total allowances . 49
A.4 Guidelines for hand forgings . 51
A.4.1 General . 51
A.4.2 General information . 52
A.4.3 Section changes and transitions . 52
A.4.4 Recommended machining allowances . 53
A.4.5 Total allowances per side of forging . 53
A.5 Guidelines for marking . 54
Annex B (informative) Tensile properties . 55
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure equipment Directive) aimed to be
covered . 59
Bibliography . 60
3
---------------------- Page: 5 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
European foreword
This document (prEN 12420:2022) 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 12420:2014.
In comparison with EN 12420:2014, the following significant technical changes were made:
1) Introduction in the chemical composition Tables of a footnote to explain the meaning of elements
for which no upper and lower limits are defined;
2) CuZn4Si4MnP (CW245E) and CuZn9Si4MnP (CW246E) added in the new Table 3 and Table 10;
3) Chemical composition of CuZn39Pb3 (CW614N), CuZn40Pb2 (CW617N), CuZn35Pb1,5AlAs
(CW625N) and CuZn33Pb1,5AlAs (CW626N) modified in Table 8;
4) Added a new alloy CuZn40Pb1 (CW627N) in Table 8, Table 10 and Table B.1;
5) Chemical composition of CuZn33Pb1AlSiAs (CW725R) modified in Table 9;
6) Added a new alloy CuZn36Si1P (CW726R) in Table 9, Table 10 and Table B.1;
7) Added new Table 12 for Hardness properties for forgings of material group III.
This 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 rectangular bars for general purposes;
— EN 12168, Copper and copper alloys — Hollow rod for free machining 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.
4
---------------------- Page: 6 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
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
CuZn4Si4MnP (CW245E), CuZn9Si4MnP (CW246E), 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/she is willing to negotiate licences under
reasonable and not-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 CuZn4Si4MnP (CW245E) and CuZn9Si4MnP (CW246E) information may be obtained from:
Viega Technology GmbH & Co. KG
Viega Platz 1
57439 Attendorn
GERMANY
— 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 (http://www.cen.eu/cen/WorkArea/IPR/Pages/default.aspx) and CENELEC
(http://www.cenelec.eu/membersandexperts/toolsandapplications/index.html) 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.
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.
5
---------------------- Page: 7 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
1 Scope
This document specifies the composition, the property requirements and tolerances on dimensions and
form for copper and copper alloy die and hand forgings.
The sampling procedures, the methods of test for verification of conformity to the requirements of this
document, and the delivery conditions 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 1173:2008, Copper and copper alloys - Material condition designation
EN 1412:2016, Copper and copper alloys - European numbering system
EN 1655:1997, Copper and copper alloys - Declarations of conformity
EN 1976:2012, Copper and copper alloys - Cast unwrought copper products
EN 10204:2004, Metallic products - Types of inspection documents
EN 14977:2006, Copper and copper alloys - Detection of tensile stress - 5 % ammonia test
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)
ISO 2768-1:1989, General tolerances — Part 1: Tolerances for linear and angular dimensions without
individual tolerance indications
ISO 6957:1988, Copper alloys — Ammonia test for stress corrosion resistance
ISO 1190-1:1982, Copper and copper alloys — Code of designation — Part 1: Designation of materials
6
---------------------- Page: 8 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
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
forging
wrought product, hot formed by hammering or pressing
3.1.1
die forging
forging produced between closed dies
3.1.2
hand forging
forging produced between open dies
3.1.3
cored forging
forging produced between closed dies including cores
3.2
deviation from concentricity
half of the difference between the maximum and the minimum wall thickness (smax and smin),
measured in the same plane perpendicular to the axis of the forging
Note 1 to entry: Deviation from concentricity (mm) = (smax − smin)/2.
3.3
inspection lot
definite quantity of products of the same cross-sectional dimensions, the same material and material
condition, collected together for inspection (testing)
4 Designations
4.1 Material
4.1.1 General
The material is designated either by symbol or number (see Tables 1 to 9).
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, 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.
7
---------------------- Page: 9 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
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;
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. 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 g) and list entry h)].
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 is 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 (Forging);
— number of this document (EN 12420);
— material designation, either symbol or number (see Tables 1 to 9);
— for the use in contact with drinking water: DW for compliance in the chemical composition
according to 4 MS Common Composition List;
— material condition designation (see Tables 10 and 12).
The derivation of a product designation is shown in the following examples.
EXAMPLE 1 Forging conforming to this standard, in material designated either CuZn40Pb2 or CW617N, for
standard applications, in material condition H070, will be designated as follows:
8
---------------------- Page: 10 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
EXAMPLE 2 Forging conforming to this standard, in material designed either CuZn40Pb2 or CW617N, for the
use in contact with drinking water DW, in material condition H070, will be designated as follows:
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 or number of pieces);
b) denomination (Forging);
c) number of this document (EN 12420);
d) material designation (see Tables 1 to 9);
e) material condition designation (see 4.2 and Tables 10 to 12) if it is other than M;
f) for the use in contact with drinking water: DW for compliance in the chemical composition
according to 4 MS Common Composition List;
g) nominal dimensions and/or tolerance drawing of the forging or finished part including the number
of the drawing (see 6.6):
It is recommended that the product designation, as described in 4.3, is used for items b) to e).
In addition, the purchaser shall also state on the enquiry and order any of the following, if required:
9
---------------------- Page: 11 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
h) whether the products are required to pass a stress corrosion resistance test. If so, which test
method is to be used (see 8.5) if the choice is not to be left to the discretion of the supplier. If the
purchaser chooses ISO 6957:1988, the pH value for the test solution is to be selected;
i) whether the products are to be supplied in a thermally stress relieved condition;
j) when requested, tensile properties have to be agreed between purchaser and supplier (see 6.2.2
and Tables B.1 to B.3);
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, labelling or packaging (see Clause 10).
EXAMPLE Ordering details for 200 forgings conforming to EN 12420, in material designated either
CuZn40Pb2 or CW617N, for the use in contact with drinking water DW, in material condition H070, according to
drawing number XY000:
200 pieces Forging EN 12420 — CuZn40Pb2 — DW — H070 — drawing number XY000
or
200 pieces Forging EN 12420 — CW617N — DW — H070 — drawing number XY000
6 Requirements
6.1 Composition
The composition shall conform to the requirements for the appropriate material given in Tables 1 to 9.
In the same tables the hot working attitude is also reported.
Due to developing legislation, specific applications (see 4.3) may require restrictions in the chemical
composition. In this case the limitations shall be stated in the ordering information [see Clause 5 list
entry f)].
NOTE As the materials specified in this standard vary considerably e.g. in their resistance to forming, forging
temperature and pressure, die wear and stresses, they have been classified into three groups of similar hot
working attitudes (I, II or III in descending order of hot working attitude).
A direct proportionality exists between the group and preheating temperature.
6.2 Mechanical properties
6.2.1 Hardness properties
The hardness properties shall conform to the appropriate requirements given in Tables 10 to 12. For
the alloys not mentioned in these tables the hardness values shall be agreed between purchaser and
supplier.
6.2.2 Tensile properties
This standard does not specify mandatory tensile properties. The values for the tensile properties given
in Tables B.1 to B.3 are for information only.
10
---------------------- Page: 12 ----------------------
oSIST prEN 12420:2022
prEN 12420:2022 (E)
6.3 Electrical properties
Forgings materials listed in Table 13 shall conform to the electrical properties specified in the same
table
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.