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1、 Reference number ISO 20081:2005(E) ISO 2005 INTERNATIONAL STANDARD ISO 20081 First edition 2005-02-15 Zinc and zinc alloys Method of sampling Specifications Zinc et alliages de zinc Mthodes dchantillonnage Spcifications Copyright International Organization for Standardization Provided by IHS under
2、license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20081:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, thi
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5、e that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilize
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7、1 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo rep
8、roduction or networking permitted without license from IHS -,-,- ISO 20081:2005(E) ISO 2005 All rights reserved iii Contents Page Forewordiv 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Principle.2 5 Apparatus.2 6 Identification of samples and preparation of test piece .2 6.1 Ident
9、ification2 6.2 Preparation 2 7 Procedure.2 7.1 Frequency of sampling during casting.2 7.2 Cast products2 Annex A (normative) Sampling of ingots with a weight equal to or less than 30 kg.3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Te
10、chnical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20081:2005(E) iv ISO 2005 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national stand
11、ards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International orga
12、nizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given
13、in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75
14、% of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20081 was prepared by Technical Committee ISO/TC 18, Zinc
15、and zinc alloys, Subcommittee SC 1, Methods of sampling and analysis of zinc and zinc alloys. This first edition cancels and replaces ISO 3751:1976, ISO 3752:1976, ISO 3816:1976 and ISO 3817:1976, which have been technically revised. Copyright International Organization for Standardization Provided
16、by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 20081:2005(E) ISO 2005 All rights reserved 1 Zinc and zinc alloys Method of sampling S
17、pecifications 1 Scope This International Standard specifies the requirements for sampling of zinc and zinc alloys, as specified in ISO 752 and ISO 301, for analysis. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references
18、, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 301, Zinc alloy ingots intended for casting ISO 752, Zinc ingots 3 Terms and definitions For the purposes of this document, the terms and definitions given
19、in ISO 301 and ISO 752 and the following apply. 3.1 sample portion of the product, representative of its chemical composition 3.2 test piece final form of the material submitted for analysis 3.3 consignment of cast product material received as load NOTE This definition is used unless otherwise agree
20、d between the purchaser and the supplier for the purpose of sampling. 3.4 sampling unit individual cast product selected from a consignment 3.5 gross sample total amount of sampling units selected from a consignment 3.6 test sample sample prepared from the gross sample and from which test portions a
21、re taken Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20081:2005(E) 2 ISO 2005 All right
22、s reserved 3.7 test portions quantity of material taken from the test sample and on which the analysis is actually carried out 4 Principle Since zinc and zinc alloy ingots have very different shapes and weights, the chemical composition of samples can differ, depending on the specific location of th
23、e test piece in the given ingot due to segregation processes during solidification. It is recommended that samples be taken during the casting process at the time of manufacture. 5 Apparatus 5.1 Ladle, designed to hold sufficient molten metal to completely fill the sample mold, with a handle or othe
24、r equipment suitable to reach into a furnace, trough, pot or crucible. It shall be made of a material not affecting the molten metal (i.e. chemically inert). 5.2 Sample moulds, designed to produce homogeneous samples representative of the product metal. The form and the size of the mould are very im
25、portant. Moulds shall have a sufficient cooling rate, to cause the rapid solidification of the metal and avoid the segregation of the components. Moulds shall be chemically inert, not affecting the molten metal. 6 Identification of samples and preparation of test piece 6.1 Identification Samples sha
26、ll be identified with a unique identity. 6.2 Preparation The shape and size of the test piece are dependent upon the device and operations used. The test piece shall be prepared according to the requirements of the analytical method used. 7 Procedure 7.1 Frequency of sampling during casting Sampling
27、 during continuous or non-continuous casting processes shall be performed at a frequency that represents the product and production facilities. Samples shall only be taken by trained and experienced personnel. 7.2 Cast products If sampling of ingots and castings is required, the method of sampling s
28、hall be agreed between the purchaser and the supplier. The sampling of ingots shall be in accordance with Annex A. Samples shall only be taken by trained and experienced personnel. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
29、 Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20081:2005(E) ISO 2005 All rights reserved 3 Annex A (normative) Sampling of ingots with a weight equal to or less than 30 kg A.1 General This annex specifies the
30、 methods for the selection and preparation of samples for chemical analysis of zinc and zinc alloys in the form of ingots less than 30 kg, when sampling from molten metal is not possible. A.2 Selection of sampling units A.2.1 General The sampling units shall be selected from batches, each batch bein
31、g composed of ingots of the same composition. Following an agreement between the purchaser and the supplier, each consignment shall be divided into a series of batches provided that they contain a) not less than 25 t for zinc ingots, or b) not less than 5 t for the zinc alloy ingots. Any consignment
32、 of less than that stated in a) and b) shall be regarded as a single batch. A.2.2 Frequency of sampling For zinc ingots from each batch of ingots, select, at random, one ingot from every 2,5 t of materials for zinc grades ZN-1, ZN-2 and ZN-3 and one ingot from every 1 t for zinc grades ZN-4 and ZN-5
33、, specified in ISO 752. For zinc alloy ingots from each batch of ingots select, at random, one ingot from every one 1 t of material. In each case, the number of ingots selected shall be not less than five. When the consignment is made up of less than five ingots, they shall all be used in making the
34、 selection. A.3 Sample preparation A.3.1 General procedure Sampling units taken from cast products not subject to significant segregation (ingot thickness above 50 mm) shall be sampled by drilling completely through each ingot. The location and number of holes shall be such as to ensure that the sam
35、ple taken is representative. Cast products subject to significant segregation shall have the whole cross-section of each sampling unit sampled by milling. Sampling may also be carried out by sawing. Before sampling, the sampling unit shall be clean and free from scale, dirt, oil, grease and other co
36、ntaminants. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20081:2005(E) 4 ISO 2005 All ri
37、ghts reserved The saw, drill bit, cutter or other tool used for sampling shall be thoroughly cleaned prior to use. The speed of sampling shall be regulated so that excessive heating and consequent oxidization of the sample is avoided. Lubricants shall not be used. Carbide-tipped tools are recommende
38、d. The gross sample shall be prepared by thoroughly mixing equal masses of drillings, millings, sawings or clippings taken from each sampling unit. The chips obtained by milling, drilling, etc., shall be uniformly small in size. The gross sample shall weigh at least four times the amount required fo
39、r the total analysis, and shall be divided into four test samples of equal mass, each of which shall be placed in a container and sealed; one for the supplier, one for the purchaser, one for reference purposes, if necessary, and one as a reserve. A.3.2 Cast zinc ingot, in accordance with ISO 752 The
40、 selection of samples for chemical analysis shall normally be carried out by drilling in accordance with the following procedure. Arrange the selected ingots flat, side by side, upside down with reference to the position occupied in the ingot mould, in groups of a maximum of ten ingots. Ensure that
41、the casting marks are arranged in the same way for each of the ingots. In each group, draw a diagonal across the rectangle thus formed. With the aid of a tungsten carbide drill of approximately 15 mm diameter and without the use of a lubricant, drill each ingot right through at two points on the dia
42、gonal, at distances from the long side of the ingot of one- third and two-thirds of the length of the short side. (See Figure A.1.) Carry out the drilling without heating the metal to the point of oxidation, in such a way as to obtain drillings of a thickness between 0,2 mm and 0,5 mm. A.3.3 Cast zi
43、nc alloy ingot in accordance with ISO 301 The selection of samples for chemical analysis shall be carried out by drilling in accordance with the following procedure. Arrange the selected ingots flat, side by side, upside down with reference to the position occupied in the ingot mould, in groups of a
44、 maximum of five ingots. Ensure that the casting marks are arranged in the same way for each of the ingots. In each group, draw a diagonal across the rectangle thus formed. With the aid of a tungsten carbide drill of approximately 15 mm diameter and without the use of a lubricant, drill each ingot r
45、ight through at three points on the diagonal, at distances from the long side of the ingot of one-quarter and three-quarters of the length of the short side. (See Figure A.2.) In the case where the exact position of the point to be drilled coincides with a notch in the ingot, choose another point as
46、 close as possible. Carry out the drilling without heating the metal to the point of oxidation, in such a way as to obtain drillings of a thickness between 0,2 mm and 0,5 mm. A.3.4 Sampling units of mass greater than 30 kg Sampling of individual sampling units of mass greater than 30 kg shall be by
47、agreement between the purchaser and the supplier. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-
48、,- ISO 20081:2005(E) ISO 2005 All rights reserved 5 Figure A.1 Cast zinc ingots Figure A.2 Cast zinc alloy ingots Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 19:30:16 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20081:2005(E) ICS 77.120.60 Price based on 5 pages ISO 2005 All rights reserved Copyright International Organiz