ISO-3954-1977.pdf
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1、INTERNATIONAL STANDARD 3954 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXCflYHAPOflHAR OPrAHC13AUCIII ITO CXAHnAPTH3Al(CIM.ORGANISATION INTERNATIONALE DE NORMALISATION Powders for powder metallurgical purposes - Sampling Poudres pour emploi en mtftallurgie des poudres - lkhantillonnage First e
2、dition - 1977-02-15 UDC 621.762 : 669-492.2 : 620.113 Ref. No. IS0 3954-1977 (E) E ul ii Descriptors : powder metallurgy, metal powder, sampling, tests. % B Price based on 5 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
3、Standards 1/9972545001 Not for Resale, 04/27/2007 19:59:10 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developin
4、g International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO,
5、 also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 3954 was developed by Technical Committee ISO/TC 119, Powd
6、er metallurgical materials and products, and was circulated to the member bodies in October 1975. It has been approved by the member bodies of the following countries : Austria Japan Canada Mexico Czechoslovakia Poland Egypt, Arab Rep. of Portugal France Romania Germany Spain Italy Sweden Turkey Uni
7、ted Kingdom U.S.A. U.S.S.R. Yugoslavia No member body expressed disapproval of the document. 0 International Organization for Standardization, 1977 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standar
8、ds 1/9972545001 Not for Resale, 04/27/2007 19:59:10 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 3954-1977 (E) Powders for powder metallurgical purposes - Sampling 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies procedure
9、s for the sampling of powders for powder metallurgical purposes. It also covers the splitting of the sample into the quantity required for testing. 2 REFERENCES IS0 78, Guide on the form for standards for chemical products and for methods of chemical analysis. IS0 3081, Iron ores - Increment samplin
10、g - Manual method. 3 DEFINITIONS The following definitions are in accordance with IS0 3081 and IS0 78. 3.1 lot : A quantity of powder processed or produced under conditions which are presumed uniform. 3.2 increment : A quantity of powder obtained by a sampling device at one time from a single lot. 3
11、.3 gross sample : The quantity of powder consisting of all the increments taken from a single lot. 3.4 composite sample : The blended entire gross sample or a representative part thereof. Alternatively it may be obtained by splitting the lot. However it is obtained, it should be thoroughly blended.
12、3.5 test sample : A quantity of powder taken from the composite sample for determining a single property or for preparing the test pieces. It should normally be taken by splitting the composite sample. 3.5.1 test portion : A definite quantity of powder drawn from the test sample (or, if both are the
13、 same, from the composite sample) and on which the test is carried out. 3.5.2 test piece : An object of specified form prepared from a test sample. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for R
14、esale, 04/27/2007 19:59:10 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3954-1977 (E) Lot Increments Gross sample (Blending) Composite sample Test samples Test portions non Test pieces (Determination) FIGURE 1 - Scheme of sampling 4 NUMBER OF INCREMENTS 4.1 Sampling
15、from powders packaged in containers Unless otherwise agreed, the number of containers listed in the table shall be selected at random from the lot when samples are taken from powder packaged in containers. One or more increments shall be taken from every selected container to provide a gross sample.
16、 If containers holding different quantities are included in the lot, the containers selected shall be representative of the lot and the number of increments taken from every selected container shall be in proportion to the content of the container. 4.2 Sampling during discharge in continuous stream
17、If the entire lot is discharged in a continuous stream through an opening, it may be sampled during discharge. In such a case, increments shall be taken at regular intervals during the entire discharge period. The number of in- 2 Number of containers in Number of containers from the lot which increm
18、ents shall be taken It0 5 all 6to 11 5 12to 20 6 21 to 35 7 36 to 60 61 to 99 100 to 149 150 to 199 200 to 299 300 to 399 8 9 10 11 12 13 For every additional 100 containers or portion thereof in the lot, one additional container shall be sampled. crements shall depend on the accuracy desired. At le
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