EN 24937-1990 en Steel and Iron - Determination of Chromium Content - Potentiometric or Visual Method《钢和铸铁 铬含量的测定 电位滴定法或肉眼法》.pdf

1、EUROPEAN STAWDARD NORME EUROPEENWE EUROPA1 SCHE WORU E 24 937 Uarch 1990 UDC 669.1543.257.1 : 546.76 Key words: Steels, Cast Iron, Cherical analysis, Determination of Content, Chromium, Titration, Potentiometric methods, Hacroscopic methods English version Steel and iron - Determination o chromium c

2、ontent - Potentiometric or visual method Aciers et fontes - Dtermination de la teneur en chrome - Ubthode potentiombtrique ou visuelle visuelle Methode Stahl und Eisen - Bestimnung des Chromgehalts - Potentiometrische oder This European Standard was accepted by CEN on 1989-11-27 and is identical to

3、the IS0 standard as referred to. CER members are bound to comply with the requirements of the CENICENELEC Com- mon Rules which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerni

4、ng such national standards ray be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in two official versions (English, French). A version in any other language made by translation under the responsibility of a CEN member into its own language

5、and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Den- mark, Finland, France, Gerrany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland

6、and United Kingdom. CEN European Comnittee for Standardization tonit Europen de Normal isation Europisches Komitee fur Normung Central Secretariat: rue Brederode 2, 8-1000 Brussels - (cl CEN 1990 Copyright reserved to all CEN members Ref. No. EN 24 937:1990 E I b CEN EN*24*737 90 m 3404587 0002323 L

7、 W EST COPY AVAILABLE EN 24 937 Page 2 Brief istory On the proposal of the Technical committee ECISS/TC 20 Methods of chemical analysis“ the Coordinating Commission (COCOR) of the European Committee for Iron and Steel Standardization (ECISC) decided in November 1988 to submit the International Stand

8、ard IS0 4937 - 1986 Steel and iron - Determination of chromium content - Potentiometric or visual titration method to the ForMi Vote. This European Standard was adopted by CEN on 1989-11-27 According to the Coiion CM/CENELEC Rules, being part of the Internal Regulations of CEN, the following countri

9、es are bound to implement this European Standards : Austria, Belgium, Dennark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. - .“- . . - .- - - The text of the International Standard IS0 4937, edition 1, 1986 was approved by CEN as a European Standard without any modification.