EN 12420:2024
(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 Formtoleranzen für Gesenk- und Freiformschmiedestücke aus Kupfer und Kupferlegierungen fest.
Der Ablauf der Probenentnahme, die Prüfverfahren zur Feststellung der Übereinstimmung mit den Anforderungen 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
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Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2024
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: EN 12420:2024
ICS:
77.150.30 Bakreni izdelki Copper products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12420
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 77.150.30 Supersedes EN 12420:2014
English Version
Copper and copper alloys - Forgings
Cuivre et alliages de cuivre - Pièces forgées Kupfer und Kupferlegierungen - Schmiedestücke
This European Standard was approved by CEN on 30 June 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 12420:2024 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 . 9
5 Ordering information . 10
6 Requirements . 11
6.1 Composition . 11
6.2 Mechanical properties . 11
6.2.1 Hardness properties . 11
6.2.2 Tensile properties. 11
6.3 Electrical properties . 11
6.4 Resistance to dezincification . 11
6.5 Residual stress level . 11
6.6 Tolerances for die forgings . 12
6.6.1 General . 12
6.6.2 Tolerances for dimensions within the die cavity and for dimensions across the die
parting line . 13
6.6.3 Mismatch . 13
6.6.4 Flash projection . 14
6.6.5 Ejector marks. 15
6.6.6 Flatness tolerances . 15
6.6.7 Angular tolerances. 16
6.7 Tolerances for cored forgings . 16
6.8 Tolerances for hand forgings . 18
6.8.1 General . 18
6.8.2 Tolerances on dimensions . 18
6.8.3 Flatness tolerance . 19
6.8.4 Surface quality. 19
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 . 20
8 Test methods . 20
8.1 Analysis . 20
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 . 21
8.6.1 Analysis, hardness, electrical conductivity and dezincification resistance tests . 21
8.6.2 Stress corrosion resistance test . 21
8.7 Rounding of results . 21
9 Certificate of compliance and inspection documentation . 21
9.1 Certificate of compliance . 21
9.2 Inspection documentation . 21
10 Marking, labelling, packaging . 22
Annex A (informative) Recommended guidelines for design . 41
A.1 Introduction. 41
A.2 General information . 41
A.3 Guidelines for die forgings . 42
A.3.1 Drafts . 42
A.3.2 Web thicknesses . 42
A.3.3 Side wall thicknesses . 43
A.3.4 Rib design . 44
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 . 49
A.3.9 Design for cross-sectional shapes . 49
A.3.10 Recommended machining allowances and total allowances . 50
A.4 Guidelines for hand forgings . 52
A.4.1 General . 52
A.4.2 General information . 52
A.4.3 Section changes and transitions . 53
A.4.4 Recommended machining allowances . 53
A.4.5 Total allowances per side of forging . 54
A.5 Guidelines for marking . 55
Annex B (informative) Tensile properties .
...
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