1、CEN ENJ23909 93 3404589 0054084 i147 EUROPEAN STANDARD EN 23909 NORME EUROPENNE EUROPISCHE NORM October 1993 UDC 621.762 : 546.73 : 543.257.1 Descriptors: Powder metallurgy, hard metals, chemical analysis, determination of content, cobalt, potentiometric methods English version Hardmetals - Determin
2、ation of cobalt - Potentiometric method (IS0 3909 : 1976) Mtaux durs - Dtermination du cobalt - Mthode potentiomtrique Kobaltgehaltes - Potentiometermethode (IS0 3909 : 1976) Hartmetalle - Bestimmung des (IS0 3909 : 1976) This European Standard was approved by CEN on 1993-10-25. CEN members are boun
3、d to comply with the CENKENELEC 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 bibliographical references concerning such national standards may be obtained on application to the Cen
4、tral Secretanat 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 member into its own language and notified to the Central Secretariat has the same status as
5、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, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Eur
6、open de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CEN members Ref. No. EN 23909 : 1993 E CEN EN*23909 93 m 3404589 0054085 083 m Page 2 EN 23909 : 1993 Foreword On the proposal of the CEN Central Secretariat, th
7、e Rchnical Board decided to submit the International Standard: Hurdwtals - DetemLinutwn of cobalt - T is the mass, in grams, of cobalt in 1 ml of the cobalt sulphate solution; m is the mass, in grams, of the test portion. The result shall be rounded to the nearest 0,Ol %. 9.2 Corrections As a tentat
8、ive guide, the following correction values may be used. Vanadium : 0.100 % (m/m) vanadium is equal to 0,116 % (mh) cobalt. Manganese : 0,100 % (m/m) manganese is equal to 0,107 %(m/m) cobalt. 9.3 Tolerances The deviations between two or three independent deter- minations shall not exceed the values
9、shown in the table. Cobalt content 9.4 Final result Report the arithmetical mean of acceptable determinations rounded to the nearest 0,l %. CEN EN*23909 93 = 3404589 00540BB 892 Page 5 EN 23909 : 1993 10 TEST REPORT c) the result obtained; The test report shall include the following information : d) all operations not specified by this International Standard, or regarded as optional; a) reference to this International Standard; b) all details necessary for identification of the test e) details of any occurrence which may have affected sample; the result.
