1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23352-5 SANS 108:2009Edition 1.1SOUTH AFRICAN NATIONAL STANDARD White metal designated WM 80 Published by SABS Standards Division 1 Dr Lat
4、egan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 108:2009 Edition 1.1 Table of changes Change No. Date Scope Amdt 1 2009 Amended to delete a referenced standard that has been withdrawn.Foreword This South African standard was appro
5、ved by National Committee SABS TC 1078, Engineering materials Non-ferrous metals, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in October 2009. This document supersedes SANS 108:2004 (edition 1). A vert
6、ical line in the margin shows where the text has been technically modified by amendment No. 1. SANS 108:2009 Edition 1.1 1 Contents Page Foreword 1 Scope . 3 2 Normative references . 3 3 Definition 3 4 Requirements . 3 5 Marking 4 6 Sampling and compliance with the standard . 4 7 Inspection and meth
7、ods of test 5 Figure . 6 SANS 108:2009 Edition 1.1 2 This page is intentionally left blank SANS 108:2009 Edition 1.1 3 White metal designated WM 80 1 Scope This standard covers a grade of white metal designated WM 80, according to its average tin content. 2 Normative references The following normati
8、ve documents contain provisions, which, through reference in this text, constitute provisions of this standard. All normative documents are subject to revision and, since any reference to a normative document is deemed to be a reference to the latest edition of that document, parties to agreements b
9、ased on this standard are encouraged to take steps to ensure the use of the most recent editions of the normative documents indicated below. Information on currently valid national and international standards can be obtained from the SABS Standards Division. BS 3338-17, Methods for the sampling and
10、analysis of tin and tin alloys Part 17:Method for the determination of cadmium in solders and white metal bearing alloys (photometric method). SANS 5244 (SABS SM 244), Aluminium content of printers metal and white metal. Amdt 1 SANS 5732, Tin content of tin and lead alloys. 3 Definition For the purp
11、oses of this standard, the following definition applies: lot number of white metal ingots or bars of the same designation, from the same manufacturer, submitted at any one time for inspection and testing 4 Requirements 4.1 Chemical composition The ingots or bars shall conform to the chemical composi
12、tion shown in table 1. SANS 108:2009 Edition 1.1 4 Table 1 Chemical composition 1 2 3 4 Symbol Element %, min. %, max. WM 80 Tin Antimony Copper 78,0 8,0 5,0 82,0 10,0 7,0 Lead Iron Zinc 5,0 8,0 0,05 0,01 Other elements Totala 0,3 aRefers to all elements other than those given in the table. 4.2 Phys
13、ical condition The metal shall be supplied in the form of bars or ingots and shall be free from slag, dross and undue segregation. 5 Marking The following information shall appear in legible and durable marking on each ingot or bar: a) the name or trade mark of the manufacturer or supplier; and b) t
14、he symbol WM 80. 6 Sampling and compliance with the standard1)6.1 Sampling The following sampling procedure shall be applied in determining whether a lot complies with the relevant requirements of the standard. The sample taken shall be deemed to represent the lot. From the lot draw at random the nu
15、mber of ingots or bars given, as relevant, in column 2 of table 2 relative to the appropriate lot size shown in column 1. Table 2 Sampling 1 2 Ingots or bars Lot size Sample size 121101201003001 2 3 More than 300 5 1) These methods are revised from time to time. In all cases the latest edition of th
16、e individual method should be used. SANS 108:2009 Edition 1.1 5 6.2 Compliance The lot shall be deemed to comply with the requirements of the standard if, after inspection and testing, the samples taken in accordance with 6.1 are found to comply with the appropriate requirements of the standard. 7 I
17、nspection and methods of test 7.1 Inspection Inspect all the ingots or bars drawn in accordance with 6.1 for compliance with the requirements of 4.2 and clause 5. 7.2 Methods of test 7.2.1 General Any reliable method of chemical analysis may be used for determining the individual constituents of the
18、 alloy(s). Suitable methods are listed in 7.2.2, 7.2.3 and 7.2.5 and shall be the methods used in all cases of dispute. Amdt 1 7.2.2 Test sample for chemical analysis Obtain the sample for chemical analysis by making cuts of depth 15 mm with a clean saw having 55 teeth per 100 mm in each sample ingo
19、t at regular intervals of not more than 50 mm (see figure 1). Do not use any lubricant. Treat the sawings carefully with a magnet to remove any particles of steel which may have been introduced during cutting. Sieve the sawings through a small sieve of aperture size 250 m and weigh into coarse and f
20、ine fractions. Mix each thoroughly and take proportional masses of each when weighing samples for analysis. 7.2.3 Tin content and lead alloys Tin content and lead alloys shall comply with the requirements of SANS 5732. 7.2.4 Deleted by amendment No. 1. 7.2.5 Cadmium in solders and white metal Cadmiu
21、m in solders and white metal bearing alloys shall comply with the requirements of BS 3338-17. SANS 108:2009 Edition 1.1 6 Figure 1 Sampling method SABS SABS Standards Division The objective of the SABS Standards Division is to develop, promote and maintain South African National Standards. This obje
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