ISO INTERNATIONAL STANDARD 9556 First edition 1989-07-15 Corrected and reprinted 1989-11-15 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace Aciers et fontes -- Dosage du carbone total -- Methode par absorption dans I'infrarouge apres combustion dans un four a induction Reference number ISO 9556 : 1989 (E) Copyright Intermational Organization for Standardization censewithIs permitted without license from IHS Not for Resale ISO9556:1989 (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. Each 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 International Standard ISO 9556 was prepared by Technical Committee ISO/TC 17, Steel. Annexes A, B and C of this International Standard are for information only. CopyrihtInteratinal Organization for Standardization No reprodt ngpermitted without license from IHS Not for Resale ISO9556 :1989 (E) INTERNATIONAL STANDARD Steel and iron - Determination of total carbon content Infrared absorption method after combustion in an induction furnace 1 Scope 4 Reagents This International Standard specifies an infrared absorption During the analysis, unless otherwise stated, use only reagents method after combustion in an induction furnace for the deter- of recognized analytical grade and only distilled water or water mination of the totai carbon content in steel and iron. of equivalent purity. The method is applicable to carbon contents between 0,003 % 4.1 Water, free from carbon dioxide. (m/m)and4,5%(m/m). Boil water for 30 min, cool to room temperature and bubble with oxygen (4.2) for 15 min. Prepare just before use. 2 Normative references 4.2 Oxygen, 99,5 % (m/m) minimum. The following standards contain provisions which, through An oxidation catalyst [copper(11) oxide or platinum] tube heated reference in this text, constitute provisions of this International to a temperature above 450 oC must be used prior to a purify- Standard. At the time of publication, the editions indicated ing unit (see annex C), when the presence of organic con- were valid. All standards are subject to revision, and parties to taminants is suspected in the oxygen. 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 4.3 Pure iron, of known low carbon content less than maintain registers of currently valid International Standards. 0,001 0 % (m/m). ISo 377: 1985, Wrought steel -- Selection and preparation of 4.4 Suitable solvent, appropriate for washing greasy or samplesandtestpieces. dirty test samples, for example, acetone. ISo 385-1: 1984, Laboratory glassware - Burettes - Part 1: 4.5 Magnesium perchlorate [Mg(CIO4)2], particle size: General requirements. from 0,7 mm to 1,2 mm. ISo 648: 1977, Laboratory glassware - One-mark pipettes. 4.6 Barium carbonate Iso 1042: 1983, Laboratory glassware -- One-mark volumetric Dry barium carbonate (minimum assay : 99,5 %) at 105 °C to flasks. 110 oc for 3 h and cool in a desiccator before use. ISO 5725 : 1986, Precision of test methods Determinationof 4.7 Sodium carbonate repeatability and reproducibility for