1、STD.BSI BS EN L2873-ENGL 2003 W LbZYbbS 0857851 q8q BS EN 12893:2000 BRITISH STANDARD Copper and copper alloys - Determination of spiral elongation number The European Standard EN 12893:2000 has the status of a British Standard ICs 77.120.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMIITED BY C
2、OPYRIGHT LAW STD-BSI BS EN L2893-ENGL 2000 IB lb2iibb9 0857852 810 I BS EN 12893:ZOOO been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 July 2000 Amd. No. O BSI 07-2000 ISBN O 580 34326 X Na
3、tional foreword Date Comments This British Standard is the officiai English language version of EN 128932000. It supersedes DD 791981 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee NW34, Copper and copper alloys, to Subcommittee NFE/34/1, Wrought and
4、 unwrought copper and copper aiioys, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and kee
5、p the UK interests informed; them in the UK. A iist of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standa
6、rds Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a contract. Users of British Standards are responsible fo
7、r their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover. The BSI copyright notice displayed in this docu
8、ment indicates when the document was last issued. STD=BSI BS EN 12873-ENGL 2000 113 LbZLilib7 0857853 757 I EUROPEAN STANDARD EN 12893 NORME EUROPENNE EUROPISCHE NORM March 2000 ICs 77.120.30 English version Copper and copper alloys - Determination of spiral elongation number Cuivre et alliages de c
9、uivre - Dtermination de lindice dallongement par spirale Kupfer und Kupferlegierungen - Bestimmung der Spiralverlngerungszahl This European Standard was approved by CEN on 24 January 2000. CEN members are bound to comply with the CENICENELEC Intemal Regulations which stipulate the conditions for giv
10、ing this Europsan Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official vers
11、ions (English, French, German). A version in any other language made by trmslation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie oficial versions. CEN members are the national standards bodies of Austria, Belgium, Cz
12、ech Republic, Denmark, Finland, France, Gemany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMIITEE FOR STANDARDIZATION EUROPAISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Central Secretariat: rue de
13、Stassari, 36 8-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12893:2000 E STD-BSI BS EN 12893-ENGL 2000 6 Lb24169 0857054 b93 Page 2 EN 12893:2000 Contents Page Foreword 3 Introduction 4 I 2 3 4 5 6 7 8 9 10
14、11 12 Scope 4 Normative references 4 Principle . 4 Apparatus 5 Selection of test sample 6 Preparation of the test sample 6 Annealing the test sample . 8 Preparation of the test piece . 8 Test procedure 9 Calculation and expression of results . 11 Precision 11 Test report . 11 O BSI 07-2000 STD-BSI B
15、S EN L2873-ENGL 2000 m Lb2Ybb7 0857055 52T E Page 3 EN 12893:2000 Foreword This European Standard has been prepared by Technical Committee CENTTC 133, Copper and copper alloys, the Secretariat of which is held by DIN. Within its programme of work, Technical Committee CENTTC 133 requested CENTTC 133N
16、VG 1, Unwrought copper products, to prepare the following standard: EN 12893 Copper and copper alloys - Determination of spiral elongation number 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 Se
17、ptember 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. According to the CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Den
18、mark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. O BSI 07-2000 STD-BSI BS EN 12893-ENGL 2000 O 1b24bb9 01!5-/85b qbb M Page 4 EN 12893:2000 Introduction The spiral elongation test is a means
19、 for measuring the response of high purity copper, intended for drawing into wire, to low temperature annealing. It is possible to discriminate between different purities of copper which vary only slightly within the composition limits of the grade and hence to assess their suitability for use in cr
20、itical production processes. The test method described is based essentially on that reviewed in ISOTTR 4745 High Conductivity Copper - Spiral Elongation Test, published in 1978 by the International Standards Organization (ISO). The Technical Report drew attention to the uncertainties of the test and
21、 also suggested further work by which these uncertainties might be dispelled. A Task Group was established by CENTTC 133NVG 1, Unwrought copper products, to investigate the precision, in terms of repeatability and reproducibility, of a test method which had been drafted by CENTTC 133NVG I following
22、work undertaken, mainly in the UK, to improve the precision of the ISOTTR 4745 test method. The Task Group comprised eight laboratories representing five countries: Belgium, France, Germany, Spain and UK. After testing an initial round of samples, the draft test method was further moderately revised
23、 and used for a further round of tests, the results of which were subjected to statistical assessment and used for the precision details in the present test method. The Spiral Elongation Number (SEN) obtained from the test is indicative of the annealability of the sample. NOTE: The word spiral used
24、in this context implies helical in strictly scientific terms. 1 Scope This European Standard specifies a method for perfomling the spiral elongation test on high purity copper drawing stock conforming to EN 1977, grade Cu-ETPI (CW003A). The method has been designed for testing high purity copper sam
25、pled at the drawing stock stage. It is not relevant for assessing the quality of copper wire selected at a later stage of processing. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at
26、 the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of
27、 the publication referred to applies. EN 1977 Copper and copper alloys - Copper drawing stock (wire rod) 3 Principle Copper wire is drawn using specified conditions, and annealed at low temperature under carefully controlled conditions. It is then wound into a spiral while supporting a specified mas
28、s. The spiral is then axially extended by the same mass. The change in length, after removal of the mass, is measured. O BSI 07-2000 STD-BSI BS EN 12893-ENGL 2000 I LbZIlbb9 0857857 3T2 Page 5 EN 12893:2000 A spiral wound from wire that retains, after the annealing treatment, some effects of the pre
29、vious cold working does not extend as much as one made from wire which the annealing treatment has made softer. Correct preparation of the test piece is very important to achieve an accurate test result. 4 Apparatus 4.1 Wire drawing facility, such as a stringing-up machine, pulling-in block or drawi
30、ng bench, capable of drawing (8,O f 0,4) mm diameter annealed copper drawing stock in a series of single passes in one direction to (2,OO f 0,Ol) mm diameter. The facility shall include a set of dies for drawing copper. The dimensions and tolerances of the dies shall conform to Table 1. The facility
31、 shall also include suitable lubrication to reduce friction and overheating of the test sample during drawing. 4.2*Annealing bath, of sufficient size to contain a test sample in the form of a (200 f 50) mm diameter coil of wire, equipped with suitable controls to maintain a temperature of (200 f 0,5
32、) “C for a period of (2,O f 0,02) h. The annealing bath shall contain either silicone oil of low viscosity, or a suitable salt (melting point approximately 150 OC) and be equipped with a stirrer to ensure a uniform temperature throughout the bath. NOTE: The performance of the annealing bath should b
33、e such that if a simulated test sample is inserted, i should reach a temperature of (200 I 0,5) “C within 5 min. The simulated sample consists of 8 mm diameter copper drawing stock formed into a coil, 200 mm in diameter, into which a thermocouple is embedded to a depth of 4 mm. The coil is placed in
34、 the annealing bath in the position normally occupied by the test samples. 4.3 Thermometer, capable of indicating or recording the temperature to an accuracy of f 0,l “C at 200 OC. 4.4 Timer, capable of measuring intervals of 2,O h in increments of 1 ,O min. 4.5 Circular gauge, as shown in Figure la
35、), for marking a 1 O00 mm gauge length without straining the annealed wire sample. The gauge dimensions shown in Figure 1 are approximate. The positions A and B are inscribed on the gauge, using a straightened length of annealed (2,OO f 0,Ol) mm diameter copper wire on which a 1 O00 mm gauge length
36、has been marked to an accuracy off 0,5 mm. 4.6 Polished steel mandrel, (20,O f 0,l) mm diameter by 50 mm minimum length, mounted with its axis horizontal i 3“ and provided with a drive mechanism to rotate it at (50 f 5) min-. 4.7 Metal block, fitted with a hook at its upper end, of total mass (2 240
37、 f 2,O) g. 4.8 Steel rule, capable of measuring 1 ,O m in increments of (I ,O I 0,Z) mm. 4.9 Loading device, capable of applying the load (see 4.7) to the test piece, positioned with its axis vertical, such that the rate of extension of the spiral does not exceed 20 mm . s-. The load shall be applie
38、d either by: - lowering the mass; or - raising the upper end of the spiral. Q BSI 07-2000 STD.BS1 BS EN L2873-EIJGL 2000 8 Lb29bb7 085785A 231 BI Page 6 EN 12893:2000 5 Selection of test sample 5.1 For drawing stock nominally 8 mm diameter Select a test sample of minimum length 500 mm, in order to p
39、rovide sufficient material for the test. 5.2 For drawing stock less than 8 mm diameter Select a test sample of length corresponding to a minimum mass of 200 g. 5.3 For drawing stock greater than 8 mm diameter Select a test sample of length corresponding to a minimum mass of 300 g. 6 Preparation of t
40、he test sample 6.1 General Carry out the appropriate cold drawing operations described in 6.2 to 6.4, using the wire drawing facility (see 4.1) at a maximum drawing speed of 65 m . min-. During drawing, lubricate the dies freely and allow the wire to cool for 5 min between passes or quench in water
41、after each pass, so as to minimize the temperature rise of the sample. All passes shall be in the same direction. 6.2 For drawing stock nominally 8 mm diameter Cold draw the test sample obtained in accordance with 5.1 , under the conditions given in 6.1, using the die sizes given in Table 1 to produ
42、ce (2,OO f 0,Ol) mm diameter wire. The final diameter of the wire shall be (2,OO f 0,Ol) mm, which shall be verified by measuring with a micrometer two diameters at right angles at each of three positions and using the mean of the results. O BSI 07-2000 STD.BSI BS EN lr2893-ENGL 2OCO 1b29hb 0857859
43、175 Die diameter Page 7 EN 12893:2000 Maximum tolerance on Maximum oval Reduction in area per mean diameter pass (for information) Table 1: Dimensions and tolerances of the dies for reducing 8 mm diameter copper drawing stock to (2,OO f 0,OI) mm diameter wire mm I mm I mm % 6,28 553 4,87 4,29 3,78 3
44、,33 2,93 f 0,02 0,Ol 22,4 f 0,02 0,Ol 22,5 f 0,02 0,Ol 22,4 i 0,02 0,Ol 22,4 f 0,02 0,Ol 22,4 f0,02 0,Ol 22,4 f 0,02 0,Ol 22,6 2,58 2,27 f0,02 0,Ol 22,5 f 0,02 0,Ol 22,6 Then: 2,OO - mean diameter is the mean of one or more pairs of measurements, taken at right angles, at the same cross-section of t
45、he wire; and - ovality is the difference between the maximum and the minimum diameters at one cross- section of the wire. f0,Ol 0,005 22,4 6.3 For drawing stock less than 8 mm diameter Cold draw the test sample obtained in accordance with 5.2, under the conditions given in 6.1 , but using a set of d
46、ies tailored to the drawing stock diameter, and chosen to achieve similar reductions per pass as those given in Table 1, to produce (2,OO f 0,Ol) mm diameter wire. Verify that the final diameter of the wire is (2,OO f 0,Ol) mm by measuring, as in 6.2. 6.4 For drawing stock greater than 8 mm diameter
47、 Reduce the test sample obtained in accordance with 5.3 to 8,O mm diameter by rolling, swaging or drawing. At the 8 mm stage cut the test sample to 500 mm and discard the surplus. Anneal the test sample at (700 f 20) “C for (I ,O f 0,02) h, then quench it in water. Clean in dilute sulphuric acid (so
48、lution with a volume fraction of 10 % ) and wash thoroughly in water to remove scale and loose copper dust. Cold draw the test sample under the conditions given in 6.1 , using the die sizes given in Table 1, to produce (2,OO i 0,Ol) mm diameter wire. Verify that the final diameter of the wire is (2,
49、OO f 0,Ol) mm by measuring, as in 6.2. O BSI 07-2000 STD-BSI BS EN L2813-ENGL 2000 H LLilqLb7 08570bCl 777 Page 8 EN 12893:2000 7 Annealing the test sample Discard a 1 m length from each end of the (2,OO i 0,Ol) mm diameter wire obtained in accordance with clause 6, to produce the test sample length. Wind this into a coil (200 f 50) mm diameter by wrapping it around a suitable former and bind the coil with copper wire ties to retain its shape. Using the annealing bath (see 4.2) and the timer (see 4.4), anneal the coiled test sample at (200 -I 0,5) “C for (2,O
