1、CEN EN*LO*178 87 M 3YOL1587 0000175 1 EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE NORM EN 10178 January 1989 Official Photocopy 543.42 062: 546.882:669.14 Key words : Iron and steel products, chemical analysis, determination of content, niobium, spectrophotometric analysis English version Chemical
2、 analysis of ferrous materials Determination of niobium in steels Spectrophotometric method Analyse chimique sidrurgiques - Dosage du niobium dans les aciers - Mthode spectrophotomtrique Chemische analyse von Eisenwerk - stoffen - Bestimmung von Niob in Sthlen - Photometrisches Verfahren This Europe
3、an Standard was accepted by CEN on1989-01-15. CEN members are bound to comply with the requirements of the CEN/CENELEC Rules whichstipulate the conditions for giving this European Standard the status of a national standard without any alteration. . Up-to-date lists and bibliographical references con
4、cerning such national stan- dards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in the official versions (English, French, Ger- man). A version in any other language made by translation under the responsi-. bility of a CEN member in
5、to its own language and notified to CEN Central Sec- retariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland , France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands Norway Portugal, Spain, Sw
6、eden, Switzerlan and United Kingdom. .I CEN European Corittee for Standardization Comit Europen de Nomlisation Europisches Kcmitee fr IJormung Central Secretariat : Rue Brderode 2, 8-1000 Brussels Copyright reserved to all CEN members Ref*No* EN 10 178:1989 E 1989 R . .I CEN EN*LO*L78 87 W 3404589 0
7、000Lb 3 W EN 10 178 ?age 2 I e Brief History rn Ahis Zuropean Standard takes over the content of EURONORY :78-85 “Chezical analysis of ferrous materials - Detersination of niohlu- Ln steels - Spectrophotometric method“, ?repared by ECISS/TC 20 “Xethodc of chemical ana?ysis“; the Secretariat of which
8、 is allocated to the Dansk Standardiseringsrad (DS). It has Sean submitted to the CEN Formal Vote following the decision of the Coorcinating Commission (COCOR) of the European Connittee for Iron ani! Steel Standardization on 1987-11-24/25. It as Seen aciogted and ratified by CEN BT on 1988-11-05. Ac
9、coroing to the Comrnon CEN/CENELEC Rules, following countries are 3ound to Iniplerent this European Standard : Austria, Belgium, Denrriark, Finland, France, Germany, Greece, Icelani, :reland, Italy, Luxemburg, Netherlands, Norway, Tortuga:, S?a;n, Sweden, Switzerland and United Kingdom. Note in clau
10、ses 1 and 9 EURONORM shall read EUROPEAN STANDARD. - I i. CEN EN*KLO*178 A9 m 340Y589 0000177 5 m EN 10 178 Page 3 Chemical analysis of ferrous materials Determination of niobium in steels Specbophowmetric msthod CONENTS 1. SCOPE AND FIELD OF APPLICATION 7. PROCEDURE 2. REFERENCE 7.2 Blink test 3, P
11、RINCIPLE 7.4 Establishmait of the cllibration graph 7.1 lut portion 7.3 Detemination 4. REAGENTS 8. EXPRESSION OF qESULTS 5. APPARATUS 9. lE.STREPOR1 6. SAMPLING ANNEX: Prrciriocldrtr 1. SCOPE AND FIELD OF APPLICATION This EURONORM spccifiies a method for the rpectrophoto- metric determination of ni
12、obium in steels The method b ipplicabk 10 111 types of steels with niobium contents up to i.% (dm), with a lower detection limit of 0.002% (dm). 2. REFERENCE EURONORM 18 - Selection and prepuuion of umpies and test pieces for slctl and iron 8nd ad produck 3. PRINCIPLE Dissolution of a test portion w
13、ith hydrochloric acid followed by oxidation with hydrogen peroxide. Precipitation of niobium md unulum with phcnyluionic acid using zirconium as a curier. Formation ol a compiex of nioium with 4-tl-pyridylozob resorand (PAR) in a bufd Nb% (mim) = - . 7.100 = is the aiiquot volume, in millilitres, ta
14、ken from the where: test portion sdution. m m, V is the mass, in grams. of the test portion; 9. TESTREPORT The test repon shall contain the following particulars: (a) the method of analysis used by reference to this EURO- cb) the results obtained. as well as the form in which they are (c) any partic
15、ular details which may have been noted during (d) any operations not specified in this EURONORM or any optionai operations which could have had an influence on the mult; (e) .U indications necessary for the identification of the sam. NORM: expressed: pk; the determination: (O the laboratory and the
16、date of urdysis. ANNEX Precision data Planned trials of this method were carried out by 10 analysts from diflerent laboratories: 5 determinations were carried out by each anaiyst on each 4 samples; J determinations were made by 7 of the analysts on a fifth sample. From the results obtained the 95% (2s) confidence limits have been calculated in accordance with IS0 5725, and are tabulated as follows: 0.029 0.0020 0.0024 n.o99 0.005 i 0.0076 0.589 0.0121 0.02 12 1.03s 0.0229 0.0408 0.906 0.017J 0.04 16 AIIO) i!pe I Niobium Repcitability Reproducibility i
