BS EN 24937-1991 Steel and iron - Determination of chromium content - Potentiometric or visual titration method《钢铁 铬含量测定 电势或目视滴定法》.pdf
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1、BRITISH STANDARD BS EN 24937:1991 ISO 4937:1986 Incorporating Amendment No.1 Steel and iron Determination of chromium content Potentiometric or visual titration method This European Standard EN24937:1990 has the status of a British StandardBSEN24937:1991 This British Standard was published under the
2、 authority ofthe Board of BSI and comes intoeffect on 31January1991 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference ISM/18 Draft for comment 86/35722 DC ISBN 0 580 19303 9 Cooperating organizations The European Committee for Standardization, under wh
3、ose supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito,
4、r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxemburg Inspection
5、du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation Un
6、ited Kingdom British Standards Institution Amendments issued since publication Amd. No. Date of issue Comments 7082 July 1992 Indicated by a sideline in the marginBSEN24937:1991 BSI 10-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief history 2 Text of EN 2
7、4937 3 National appendix NA Inside back cover National appendix NB Inside back coverBSEN24937:1991 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Iron and Steel Standards Policy Committee. It is the English language version ofEN24937:1990 “Steel a
8、nd iron Determination of chromium content Potentiometric or visual titration method” published by the European Committee for Standardization (CEN). It supersedes BS6200-3.10.1:1985, which is withdrawn. EN24937:1990 is identical with ISO4937:1986 published by the International Organization for Standa
9、rdization (ISO). Other methods for the determination of chromium in ferrous materials have been published as BS6200-3.10.2 andBS6200-3.10.4. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applica
10、tion. 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, pagesi andii, theENtitle page, pages2to12, an inside back cover and a back cover. This standard has been updated (see cop
11、yright 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 24937 March 1990 UDC 669.1:543.257.1:546.76 Key words: Steels, cast iron, chemical analysis, determination of content, c
12、hromium, titration, potentiometric methods, macroscopic methods English version Steel and iron Determination of chromium content Potentiometric or visual method Aciers et fontes Dtermination de la teneur en chrome Mthode potentiomtrique ou visuelle Stahl und Eisen Bestimmung des Chromgehalts Potenti
13、ometrische oder visuelles Titrationsverfahren This European Standard was accepted by CEN on27November1989 and is identical to the ISO standard as referred to. CEN members are bound to comply with the requirements of the CEN/CENELEC Common Rules which stipulate the conditions for giving this European
14、 Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in two official versions (English,
15、French). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland
16、, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussel
17、s CEN 1990 Copyright reserved to all CEN members Ref. No. EN 24937:1990EEN24937:1990 2 BSI 10-1999 Brief history On the proposal of the Technical Committee ECISS/TC20 “Methods of chemical analysis” the Coordinating Commission (COCOR) of the European Committee for Iron and Steel Standardization (ECIS
18、S) decided in November1988 to submit the InternationalStandard ISO 4937:1986, Steel and iron Determination of chromium content Potentiometric or visual titration method. to the Formal Vote. This European Standard was adopted by CEN on1989-11-27. According to the Common CEN/CENELEC Rules, being part
19、of the Internal Regulations of CEN, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. Statement The text
20、of the InternationalStandard ISO4937, edition1,1986 was approved by CEN as a European Standard without any modification. Contents Page Brief history 2 1 Scope and field of application 3 2 References 3 3 Principle 3 4 Reagents 3 5 Apparatus 5 6 Sampling 5 7 Procedure 5 8 Expression of results 7 9 Tes
21、t report 8 Annex A Additional information on the international co-operative tests 9 Annex B Graphical representation of precisiondata 10 Figure 1 Potentiometric titration Logarithmic relationship between chromium content and repeatability (r) and reproducibility (R) 10 Figure 2 Visual titration Loga
22、rithmic relationship between chromium content and repeatability (r) and reproducibility (R) 11 Table 1 Potentiometric titration 8 Table 2 Visual titration 8 Table 3 Composition of test samples 9EN24937:1990 BSI 10-1999 3 1 Scope and field of application This International Standard specifies a method
23、 for the determination of chromium in steel and iron by potentiometric or visual titration. The method is applicable to chromium contents between0,25 and35%(m/m). If vanadium is present, the visual titration is applicable only to test portions containing less than3mg of vanadium. 2 References ISO 37
24、7, Wrought steel Selection and preparation of samples and test pieces. ISO 385-1, Laboratory glassware Burettes Part1: General requirements. ISO 648, Laboratory glassware One-mark pipettes. ISO 1042, Laboratory glassware One-mark volumetric flasks. ISO 5725, Precision of test methods Determination o
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