EN 24935:1991

Steel and iron - Determination of sulphur content - Infrared absorption method after combustion in an induction furnace (ISO 4935:1989)

The method is applicable to sulphur contents between 0,002 % (m/m) and 0,10 % (m/m). Specifies principle, reagents and material, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international cooperative tests. Annex B represents the precision date graphically. Annex C deals with induction furnaces and infrared sulfur analysers.

Stahl und Eisen - Bestimmung des Schwefelgehalts - Methode mit Infrarotabsorption nach Verbrennung im Induktionsofen (ISO 4935:1989)

Aciers et fontes - Détermination du soufre - Méthode par absorption dans l'infrarouge après combustion dans un four à induction (ISO 4935:1989)

L'IEC 61811-10:2002 est une spécification intermédiaire applicable aux relais électromécaniques élémentaires (de tout-ou-rien à temps non spécifié) sous assurance de la qualité pour application industrielle.

Jeklo in železo - Določanje žvepla - Infrardeča absorpcijska metoda po zgorevanju v indukcijski peči (ISO 4935:1989)

General Information

• Status: Published
• Publication Date: 19-Dec-1991
• ICS: 77.080.01 - Ferrous metals in general
• Technical Committee: ECISS/TC 102 - Methods of chemical analysis for iron and steel
• Drafting Committee: ECISS/TC 102 - Methods of chemical analysis for iron and steel
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 03-Jun-2009
• Completion Date: 03-Jun-2009
• Ref Project: SIST EN 24935:1997 - Steel and iron - Determination of sulphur content - Infrared absorption method after combustion in an induction furnace (ISO 4935:1989)

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Stahl und Eisen - Bestimmung des Schwefelgehalts - Methode mit Infrarotabsorption nach Verbrennung im Induktionsofen (ISO 4935:1989)Aciers et fontes - Détermination du soufre - Méthode par absorption dans l'infrarouge apres combustion dans un four a induction (ISO 4935:1989)Steel and iron - Determination of sulphur content - Infrared absorption method after combustion in an induction furnace (ISO 4935:1989)77.080.01Železne kovine na splošnoFerrous metals in generalICS:Ta slovenski standard je istoveten z:EN 24935:1991SIST EN 24935:1997en01-maj-1997SIST EN 24935:1997SLOVENSKI
STANDARD



SIST EN 24935:1997



SIST EN 24935:1997



SIST EN 24935:1997



INTERNATIONAL STANDARD First edition 1989-09-15 Corrected and reprinted 1990-02-0 1 Steel and iron - Determination of Sulfur content - Infrared absorption method after combustion in an induction furnace Aciers et fontes - Dosage du soufre - IWthode par absorp tion apres combustion dans un four 2 induction dans l’in frarouge Reference number ISO 4935 : 1989 (El SIST EN 24935:1997



PSO4935:1989 (E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 4935 was prepared by Technical Committee ISO/TC 17, S teel. Annexes A, B and C of this International Standard are for information only. 0 ISO 1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland SIST EN 24935:1997



INTERNATIONAL STANDARD ISO 4935 : 1989 (E) Steel and iron - Determination of Sulfur content - Infrared absorption method after combustion in an induction furnace 1 Scope This International Standard specifies an infrared absorption method after combustion in an induction furnace for the deter- mination of Sulfur content in steel and iron. The method is applicable to Sulfur contents between 0,002 % Hrn) and 0,lO % (mlm) 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent editions of the Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 377 : 1985, Wrought steel - Selection and preparation of samples and test pieces. ISO 385-1 : 1984, Laboratory glassware - Burettes - Part 7: General requiremen ts. ISO 648 : 1977, Laboratoy glassware - One-mark pipettes. ISO 1042 : 1983, Laboratoryglassware - One-mark volumetric flasks. ISO 5725 : 1986, Precision of testmethods - Determination of repeatability and reproducibility for a Standard test method by in ter-labora tory tes ts. 3 Principle Combustion of a test Portion with accelerator at a high temperature in a high-frequency induction furnace in a current of pure Oxygen. Transformation of Sulfur into Sulfur dioxide. Measurement by infrared absorption of the Sulfur dioxide carried by a current of Oxygen. 4 Reagents and materials During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Oxygen, 99,5 % (mlm ) minimum. An Oxidation catalyst LcopperUl) Oxide or platinuml tube heated to a temperature above 450 OC must be used Prior to a purify- ing unit (see annex C), when the presence of organic con- taminants is suspected in the Oxygen. 4.2 Pure iron, of known low Sulfur contents less than 0,000 5 % hlm). 4.3 Suitable solvent, appropriate for washing greasy or dirty test samples, for example, acetone. 4.4 Magnesium perchlorate [MgK104)21, particle size: from 0,7 mm to 1,2 mm. 4
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