BS-EN-24491-4-1993 ISO-4491-4-1989.pdf
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1、BRITISH STANDARD BS EN 24491-4:1993 ISO 4491-4: 1989 Metallic powders Determination of oxygen content by reduction methods Part 4: Total oxygen by reduction-extraction The European Standard EN 24491-4:1993 has the status of a British Standard UDC 621.762:669-492.2:543.73:546.21 BS EN 24491-4:1993 Th
2、is British Standard, having been prepared under the direction of the Iron and Steel Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 June 1993 BSI 11-1999 The following BSI references relate to the work on this standard: Committee refer
3、ence ISM/65 Special announcement in BSI News January 1993 ISBN 0 580 21918 6 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: AustriaOest
4、erreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological
5、Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociacin Espao
6、la de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments BS EN 24491-4:1993 BSI 11-1999i Contents Page Cooperating organizationsIn
7、side front cover National forewordii Foreword2 Introduction3 1Scope3 2Normative reference3 3Principle3 4Apparatus and materials4 5Test portion4 6Procedure4 7Expression of results5 8Test report5 Annex A (informative) Examples of conditions of extraction for selected metal powders6 Annex ZA (normative
8、) Normative references to international publications with their relevant European publications7 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referenceInside back cover Table 15 Table A.16 BS EN 24491-4:1993 ii BSI 11-1999 National fore
9、word This British Standard has been prepared under the direction of the Iron and Steel Standards Policy Committee and is the English language version of EN 24491-4:1993 Metallic powders Determination of oxygen content by reduction methods Part 4: Total oxygen by reduction-extraction, published by th
10、e European Committee for Standardization (CEN). It is identical with ISO 4491-4:1989, prepared by Technical Committee 119, Power metallurgy, of the International Organization for Standardization (ISO) with the active participation of the UK. A British Standard does not purport to include all the nec
11、essary provisions of a contract. Users of British Standards are responsible for 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, pages i and ii, the
12、EN title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 24491-4 Apri
13、l 1993 UDC 621.762:669-492.2:543.73:546.21 Descriptors: Powder metallurgy, metallic powder, chemical analysis, determination of content, oxygen, reduction methods, extraction methods English version Metallic powders Determination of oxygen content by reduction methods Part 4: Total oxygen by reducti
14、on-extraction (ISO 4491-4:1989) Poudres mtalliques Dosage de loxygne par les mthodes de rduction Partie 4: Oxygne total par rduction-extraction (ISO 4491-4:1989) Metallpulver Bestimmung des Sauerstoffgehaltes durch Redukdtionsverfahren Teil 4: Gesamt-Sauerstoffgehalt durch Reduktionsextraktion (ISO
15、4491-4:1989) This European Standard was approved by CEN on 1993-04-02. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliograph
16、ical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN
17、 member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
18、 Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 24491-4:1993 E EN 24491-4:1993 BSI 11-1999 2 F
19、oreword In 1992, ISO 4491-4:1989 Metallic powders Determination of oxygen content by reduction method Part 4: Total oxygen by reduction-extraction was submitted to the CEN Primary Questionnaire procedure. Following the positive result of the CEN/CS proposal ISO 4491-4:1989 was submitted to the CEN F
20、ormal Vote. The result of the Formal Vote was positive. 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 October 1993, and conflicting national standards shall be withdrawn at the latest by October
21、 1993. According to the Internal Regulations of CEN/CENELEC, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United K
22、ingdom. NOTEThe European references to international publications are given in Annex ZA (normative). EN 24491-4:1993 BSI 11-19993 Introduction The determination of the oxygen content of metallic powders is of the utmost importance in many fields of powder metallurgy. The standard methods described i
23、n parts 2 and 3 of this International Standard do not give the total oxygen content of the sample, as some oxygen-containing constituents are not reduced by hydrogen. Therefore, a standard method for the determination of the total oxygen content is needed. The most frequently used method is reductio
24、n-extraction. It can be carried out with various commercially available instruments working according to different principles of extraction and measurement. It should be emphasized that the results of the analysis depend on the type of equipment used and on the test parameters selected. However, as
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