BS EN 10276-2:2003 – Chemical analysis of ferrous materials ——Determination of oxygen content in steeland iron —— Part 2: Infrared method after fusionunder inert gas
1Scope
This European Standard specifies an infrared method after fusion under inert gas for the determination ofoxygen in steel and iron.
The method is applicable to oxygen contents between 0,0005 %(m/m) and 0,01 %(m/m).
2Normative references
This European Standard incorporates by dated or undated reference，provisions from other publications.These normative references are cited at the appropriate places in the text, and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications apply tothis European Standard only when incorporated in it by amendment or revision. For undated references thelatest edition of the publication referred to applies (including amendments).
EN 10276-1
Chemical analysis of ferrous materials – Derermination of oxygenin steel and iron – Part T: Sampling and preparation of steelsamples for oxygen determination.
EN ISO14284
Steel and iron – Sampling and preparation of samples for thedetermination of chernical composition (ISO 14284:T996).
Principle
Fusion of a test portion in a single-use graphite crucible under helium gas at a minimum temperature of2000°C.Combination of the oxygen from the sample with carbon from the crucible to form carbon monoxide.Eventually transformation of carbon monoxide into carbon dioxide.
Measurement of infrared absorption of the carbon monoxide or dioxide and use of a calibration curve plottedusing the measurements obtained with potassium nitrate.
4Reagents and materials
During the analysis, unless otherwise stated, only reagents of recognised analytical grade shall be used. Thefollowing reagents and materials shall be used:
4.1 Helium, high purity, total impurity content 0,0005 %(m/m).
An oxidation catalyst [copper (ll) oxide or platinum] tube heated to a temperature above 450 C shall be usedprior to a purifying unit, when the presence of organic contaminants is suspected in the helium.
4.2 Magnesium perchlorate,Mg (CIO4)2, (commercial designation: anhydrone), particle size from 1,2mm to 2,0 mm, or Anhydrous Calcium sulphate,(Cas0,). (commercial designation: drierite),particlesize from 0.6 mm to 0.85 mm.
4.3 Sodium hydroxide on granulated support, (NaOH),(commercial designation: ascarite), particlesize from 0,7 mm to 12 mm.
BS EN 10276-2:2003 – Chemical analysis of ferrous materials ——Determination of oxygen content in steeland iron —— Part 2: Infrared method after fusionunder inert gas