SIST EN 10071:2013

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Chemische Analyse von Eisenwerkstoffen - Bestimmung von Mangan in Stahl und Eisen - Elektrometrisches TitrierverfahrenAnalyse chimique des aciers et des fontes - Détermination du manganèse dans les aciers et les fontes - Méthode par titrage électrométriqueChemical analysis of ferrous products - Determination of manganese in steels and irons - Electrometric titration method77.080.01Železne kovine na splošnoFerrous metals in general77.040.30Kemijska analiza kovinChemical analysis of metalsICS:Ta slovenski standard je istoveten z:EN 10071:2012SIST EN 10071:2013en,fr,de01-april-2013SIST EN 10071:2013SLOVENSKI
STANDARDSIST EN 10071:19961DGRPHãþD



SIST EN 10071:2013



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 10071
October 2012 ICS 77.040.30 Supersedes EN 10071:1989English Version
Chemical analysis of ferrous materials - Determination of manganese in steels and irons - Electrometric titration method
Analyse chimique des matériaux ferreux - Détermination du manganèse dans les aciers et les fontes - Méthode par titrage électrométrique
Chemische Analyse von Eisenwerkstoffen - Bestimmung von Mangan in Stahl und Eisen - Elektrometrisches Titrierverfahren This European Standard was approved by CEN on 17 August 2012.
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 bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
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B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10071:2012: ESIST EN 10071:2013



EN 10071:2012 (E) 2 Contents Page Foreword .31Scope .42Normative references .43Principle .44Reagents .45Apparatus .66Sampling .67Procedure .68Expression of results .79Test report .8 SIST EN 10071:2013



EN 10071:2012 (E) 3 Foreword This document (EN 10071:2012) has been prepared by Technical Committee ECISS/TC 102 “Methods of analysis for iron and steel”, the secretariat of which is held by SIS. 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 April 2013, and conflicting national standards shall be withdrawn at the latest by April 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 10071:1989. In comparison with EN 10071:1989, the following significant technical change was made:  Clause 3, Principle, rewording of the third sentence in order to correct the erroneous mention of “pyrophosphoric irons”. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 10071:2013



EN 10071:2012 (E) 4 1 Scope This European Standard specifies an electrometric titration method for the determination of manganese in steels and irons. The method is applicable to unalloyed, low alloy or alloyed steels and to irons with manganese contents greater than or equal to 0,5 % (m/m). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 648, Laboratory glassware — Single-volume pipettes (ISO 648) EN ISO 1042, Laboratory glassware — One-mark volumetric flasks (ISO 1042) EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical composition (ISO 14284) 3 Principle Dissolution of the test portion with appropriate acids, followed by a partial neutralisation of the acids with sodium hydrogen carbonate. Precipitation of the interfering cations with zinc oxide. Titration of Mn (II) with a potassium permanganate solution, in a pyrophosphoric medium at a pH of about 6,5. The oxidation-reduction reaction [oxidation of Mn (II) to Mn (III)] is controlled by an electrometric measurement. 4 Reagents During the analysis, use only reagents of recognised analytical grade. 4.1 Water, free from reducing compounds. For each 1 000 ml of water add 6 ml of sulphuric acid (ρ20 = 1,84 g/ml) and boil. Add a few crystals of sodium periodate and maintain the boiling for about 10 min. Cool and transfer into an appropriate vessel. 4.2 Zinc oxide, free from compounds which can reduce the permanganate ions. 4.3 Nitric acid solution, 1 + 1. Add 500 ml of
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