1、BSI Standards PublicationBS EN 12420:2014Copper and copper alloys ForgingsBS EN 12420:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12420:2014. Itsupersedes BS EN 12420:1999 which is withdrawn.The UK participation in its preparation was entrusted to Techn
2、icalCommittee NFE/34/1, Wrought and unwrought copper and copperalloys.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplicat
3、ion. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 78745 4ICS 77.150.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee
4、on 30 June 2014.Amendments issued since publicationDate Text affectedBS EN 12420:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12420 June 2014 ICS 77.150.30 Supersedes EN 12420:1999English Version Copper and copper alloys - Forgings Cuivre et alliages de cuivre - Pices forges Kupfer und K
5、upferlegierungen - Schmiedestcke This European Standard was approved by CEN on 24 April 2014. 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-dat
6、e 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
7、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, Form
8、er Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT
9、EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12420:2014 EBS EN 12420:2014EN 12420:2014 (E) 2 Contents
10、Page 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 10 6.1 Composition 10 6.2 Mechanical properti
11、es 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 . 11 6.6.1 General . 11 6.6.2 Tolerances for dimensions within the die cavity and for dimensions across
12、the die parting line . 12 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 17 6.8.1 General . 17 6.8.2 Tolerances on dimensions 18 6.8.3 Flatness tol
13、erance 18 6.9 Surface quality 19 6.10 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 BS EN 12420:2014EN 12420:2014 (E) 3 8.3
14、 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 Declar
15、ation of conformity and inspection documentation . 21 9.1 Declaration of conformity . 21 9.2 Inspection documentation 21 10 Marking, labelling, packaging 22 Annex A (informative) Recommended guidelines for design . 39 A.1 Introduction 39 A.2 General information 39 A.3 Guidelines for die forgings . 4
16、0 A.3.1 Drafts 40 A.3.2 Web thicknesses . 40 A.3.3 Side wall thicknesses 41 A.3.4 Rib design 42 A.3.5 Cores . 43 A.3.6 Flash . 44 A.3.7 Transition radii . 45 A.3.8 Clamping lengths and clamping areas for finish machining 47 A.3.9 Design for cross-sectional shapes 47 A.3.10 Recommended machining allo
17、wances and total allowances . 48 A.4 Guidelines for hand forgings . 50 A.4.1 General . 50 A.4.2 General information 50 A.4.3 Section changes and transitions . 51 A.4.4 Recommended machining allowances . 51 A.4.5 Total allowances per side of forging . 52 A.5 Guidelines for marking . 52 Annex B (infor
18、mative) Tensile properties . 54 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC, Pressure Equipment Directive (PED) . 58 Bibliography 59 BS EN 12420:2014EN 12420:2014 (E) 4 Foreword This document (EN 12420:2014) has been prep
19、ared 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 December 2014 and conflicting national s
20、tandards shall be withdrawn at the latest by December 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes E
21、N 12420:1999. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Pressure Equipment Directive (PED) 97/23/EC. For relationship with EU Directive 97/23/EC, see informative Annex ZA,
22、 which is an integral part of this document. 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 alloy
23、s 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 ro
24、d for free machining purposes. Within its programme of work, Technical Committee CEN/TC 133 requested CEN/TC 133/WG 4 “Extruded and drawn products, forgings and scrap” to revise the following standard: EN 12420:1999, Copper and copper alloys Forgings. In comparison with EN 12420:1999, the following
25、significant technical changes were made: 1) new text has been introduced concerning optional restrictions to chemical compositions of materials with respect to individual uses or regulations for the use in contact with drinking water; 2) materials have been considered coherently with EN 12165:2011;
26、3) four new materials have been added: CuZn35Pb1,5AlAs (CW625N), CuZn33Pb1,5AlAs (CW626N), CuZn21Si3P (CW724R) and CuZn33Pb1AlSiAs (CW725R); 4) the mechanical properties have been modified to reflect market needs; 5) an informative Annex B Tensile properties has been introduced. BS EN 12420:2014EN 1
27、2420:2014 (E) 5 According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedo
28、nia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12420:2014EN 12420:2014 (E) 6 Introduction The European Committee
29、 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 CuZn21Si3P (CW724R) and CuZn33Pb1AlSiAs (CW725R). CEN takes no position concerning the evidence, validity and scope of this patent right.
30、 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 CuZn21Si3
31、P (CW724R) information may be obtained from: Wieland-Werke AG Graf Arco Strae 36 89079 Ulm GERMANY For CuZn33Pb1AlSiAs (CW725R) information may be obtained from: Diehl Metall Messing Heinrich-Diehl-Strae 9 D-90552 Rthenbach/Pegnitz GERMANY Attention is drawn to the possibility that some of the eleme
32、nts 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/toolsandapplicat
33、ions/index.html) maintain on-line 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 Europe
34、an 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 restri
35、ctions are indicated. The absence of an indication, however, does not imply that the material can be used in any application without any legal restriction. BS EN 12420:2014EN 12420:2014 (E) 7 1 Scope This European Standard specifies the composition, the property requirements and tolerances on dimens
36、ions 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. 2 Normative references The following documents, in whole or in part, are
37、normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1173, Copper and copper alloys Material condition desi
38、gnation EN 1655, Copper and copper alloys Declarations of conformity EN 1976, Copper and copper alloys Cast unwrought copper products EN 10204:2004, Metallic products Types of inspection documents EN 14977, Copper and copper alloys Detection of tensile stress 5 % ammonia test EN ISO 6506-1, Metallic
39、 materials Brinell hardness test Part 1: Test method (ISO 6506-1) EN ISO 6509, Corrosion of metals and alloys Determination of dezincification resistance of brass (ISO 6509) ISO 2768-1, General tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indications I
40、SO 6957, Copper alloys Ammonia test for stress corrosion resistance 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 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
41、 forging forging produced between open dies 3.1.3 cored forging forging produced between closed dies including cores BS EN 12420:2014EN 12420:2014 (E) 8 3.2 deviation from concentricity half of the difference between the maximum and the minimum wall thickness (smaxand smin), measured in the same pla
42、ne 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 Designation
43、s 4.1 Material 4.1.1 General The material is designated either by symbol or number (see Tables 1 to 8). 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 standard might be the same as those in
44、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. 4.2 Material condition For the purposes of this standard, the followin
45、g designations, which are in accordance with the system given in EN 1173, 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
46、 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 corros
47、ion 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 rapi
48、d 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. BS EN 12420:2014EN 12420:2014 (E) 9 The product designation is no substitute for
49、 the full content of the standard. The product designation for products to this standard shall consist of: denomination (Forging); number of this European Standard (EN 12420); material designation, either symbol or number (see Tables 1 to 8); 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 9 and 10). The derivation of a product designation is shown in the following examples. EXAMPLE 1
