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 978-0-626-21495-1 SANS 25:2008Edition 2.1Any reference to SABS 25 is deemedto be a reference to this standard(Government Notice No. 1373 of 8 Novemb
4、er 2002)SOUTH AFRICAN NATIONAL STANDARD Zinc alloy ingots for die-castings Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 25:2008 Edition 2.1 T
5、able of changes Change No. Date Scope Amdt 1 2008 Amended to change the designation of SABS standards to SANS standards, to update the definition of “acceptable“, and to update areferenced standard. Acknowledgement Standards South Africa wishes to acknowledge the valuable assistance derived from pub
6、lications of the following organizations: American Society for Testing and Materials British Standards Institution Imperial Smelting Corporation International Organization for Standardization Mazak Ltd Zinc Alloy Die-Casters Association Foreword This South African standard was approved by National C
7、ommittee StanSA TC 5120.78, Engineering materials Non-ferrous metals, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was published in July 2008. This document supersedes SABS 25:1977 (edition 2). A vertical line in the marg
8、in shows where the text has been technically modified by amendment No. 1. SANS 25:2008 Edition 2.1 1 Contents Page Acknowledgement Foreword 1 Scope 3 2 Definitions . 3 3 Requirements 3 4 Packing and marking . 4 5 Sampling and compliance with the specification 4 6 Inspection and methods of test 6 6.1
9、 Inspection . 6 6.2 Preparation of test samples 6 6.3 Analysis of the ingot metal 6 Appendix A Applicable standards . 8 Appendix B Notes to purchasers . 8 SANS 25:2008 Edition 2.1 2 This page is intentionally left blank SANS 25:2008 Edition 2.1 3 Zinc alloy ingots for die-castings 1 Scope This speci
10、fication covers two grades of zinc die-castings alloy in the form of ingots. NOTE a) The titles of standards referred to by number in the specification are given in appendix A. b) Requirements that must be specified by the purchaser and a requirement that must be agreed upon are listed in appendix B
11、. 2 Definitions 2.1 For the purposes of this specification the following definitions shall apply: acceptable acceptable to the authority administering this standard, or to the parties concluding the purchase contract, as relevant Amdt 1 cast (batch) a) ingots that are the product of one furnace or c
12、rucible melt; or b) ingots that are the product of a number of crucible or furnace melts that have been combined and mixed before casting defective an ingot or a stack of ingots that fails in one or more respects to comply with the relevant requirements of the specification lot all ingots of the sam
13、e nominal composition and bearing the same cast identification, made by one manufacturer, submitted at any one time for inspection and testing 3 Requirements 3.1 General The ingots shall be of uniform quality and acceptably free from refractory oxides, abrasive inclusions, dross, and other harmful c
14、ontamination1). 1) The zinc used in the manufacture of the alloys should at least comply with the requirements for primary zinc Zn 1 of SANS 20. SANS 25:2008 Edition 2.1 4 3.2 Chemical composition The composition of the ingots, determined in accordance with 6.3, shall comply with the requirements gi
15、ven in table 1 appropriate to the metal designation or the SA code number specified by the purchaser. 3.3 Certification When so required by the purchaser, each lot (consignment) shall be accompanied by a certificate stating that the ingots comply with the appropriate requirements of the specificatio
16、n and containing confirmatory analytical results. 4 Packing and marking 4.1 Packing The ingots shall be packed in stacks that are securely bound by means of galvanized steel tape or by other acceptable means and that are capable of being handled by a fork lift truck or a similar device. Only ingots
17、bearing the same cast identification shall be packed together in a stack except that, when so agreed between the manufacturer and the purchaser, a stack may contain ingots from not more than two casts. 4.2 Marking The following information shall be legibly inscribed (by casting or stamping) on each
18、ingot: a) the manufacturers name or trade name or trade mark; b) the cast (batch) identification; c) the metal designation or the SA code number (see table 1). 5 Sampling and compliance with the specification2)5.1 Sampling The following sampling procedure shall be applied in determining whether a lo
19、t complies with the requirements of the specification. The sample so taken shall be deemed to represent the lot for the respective properties. 5.1.1 Sampling for testing After inspecting the lot (see 6.1), take from it at random 5 % of the ingots (but at least one ingot). 5.2 Compliance with the spe
20、cification The lot shall be deemed to comply with the specification if after inspection of the lot and testing of the sample taken in accordance with 5.1.1 no defective is found. 2) This section applies to the sampling for inspection and testing before acceptance or rejection of single lots (consign
21、ments) in cases where no information about the implementation of quality control or testing during manufacture is available to help in assessing the quality of the lot. It is also used as the procedure for adjudicating in cases of dispute. Table 1 Chemical composition 1 2 3 4 5 6 7 8 9 10 11 12 13 1
22、4 15 Alloying constituents Impurities % % Metal designation SA code No. Zn Al Mg Cu Fe Cu Pb Cd Sn Ni Tl ln ZnA14 ZA1 min. 3,9 0,04 max. 4,3 0,06 0,050 0,030 0,003 0,003 0,001 0,001 0,001 0,000 5Zn14Cu1 ZA2 min. 3,9 0,04 0,75 max. Remainder 4,3 0,06 1,25 0,050 0,003 0,003 0,001 0,001 0,001 0,000 55
23、SANS 25:2008 Edition 2.1SANS 25:2008 Edition 2.1 6 6 Inspection and methods of test 6.1 Inspection Visually examine the lot for compliance with the requirements of section 4 and for uniformity of quality and freedom from superficial contamination (see 3.1). 6.2 Preparation of test samples 6.2.1 For
24、(Physico-) chemical analysis By scratch brushing and then by soft brushing remove any surface contaminants from the ingot or ingots in the sample taken in accordance with 5.1.1. In the case of a single ingot sample scribe two diagonals across a face of the ingot, and in the case of a sample containi
25、ng more than one ingot place the ingots side by side a) in a row or rows of five, the last row, if the number of ingots in the sample is not a multiple of five, containing all the remaining ingots; and b) in a row containing all the ingots if the sample consists of less than five ingots, and scribe
26、two diagonals across a face of each set of ingots. Using a drill of diameter about 9,5 mm completely drill through the ingot or through each ingot (as relevant) on each diagonal at so many places that a sample of drillings of total mass approximately 1 kg is obtained. Mix the drillings thoroughly an
27、d treat them with a powerful magnet to ensure that any iron contamination is removed. 6.2.2 For spectrographic analysis After taking the test sample as described in 6.2.1 from the ingot(s) in the sample taken in accordance with 5.1.1, saw off, in complete sections, enough pieces to yield a test samp
28、le of total mass at least 1 kg. Immerse the pieces for a few moments in hydrochloric acid (5 % (m/m), rinse in distilled or demineralized water, and dry. Then melt the pieces together, without flux, in a clean carborundum or silica crucible and at no time allow the temperature of the melt to rise ab
29、ove 425 C. Skim and stir the melt with a clean dry wooden stick or silica rod then, using a casting temperature of not more than 425 C and not less than 410 C, cast the melt vertically into a suitable clean cast iron or mild steel mould that has been preheated to 100 C. 6.3 Analysis of the ingot met
30、al Using any recognized and acceptable physico-chemical method3)or other method determine in a representative portion of the test sample (6.2) the content of each element for which limits are specified in columns 5-15 of table 1. Amdt 1 NOTE a) In cases of dispute the methods adopted by the Standard
31、s South Africa shall be used. b) In verifying compliance with the limits given in the table, round off, in accordance with the following rules, the test results to the minimum number of figures necessary to assess compliance: 1) When the figure immediately after the last figure to be retained is low
32、er than 5, the last figure to be retained remains unchanged. 3) Such as ASTM E27. Amdt 1 SANS 25:2008 Edition 2.1 7 2) When the figure immediately after the last figure to be retained is greater than 5, or is equal to 5, and is followed by at least one figure other than zero, the last figure to be r
33、etained is increased by one. 3) When the figure immediately after the last figure to be retained is equal to 5 and is followed by zeros only, the last figure to be retained remains unchanged if even and is increased by one if odd. SANS 25:2008 Edition 2.1 8 Appendix A4)Applicable standards Reference
34、 is made to the latest issues of the following standards: ASTM Method E27, Spectrochemical analysis of zinc-base alloys and high-grade zinc by the solution residue D-C arc technique. Amdt 1 SANS 20 (SABS 20), Primary zinc. Appendix B Notes to purchasers B.1 The following requirements must be specifi
35、ed in tender invitations and in the order or contract: a) The metal designation or the SA code number (see 3.2 and table 1) b) When required, that a certificate of compliance is to accompany each lot (see 3.3) B.2 The following requirement must be agreed upon between the manufacturer and the purchaser: That stacks may contain ingots from two casts (see 4.1). Standards South Africa 4) The information in the appendices is additional to that in the specification and has been included purely for information and guidance.
