RAPID DETERMINATION OF SMALL AMOUNTS OF CARBON IN IRON AND STEEL (I)

Modification of the Gas Volumetric [Gakushin] Method for Determining Low Carbon Contents

Abstract

(1) In order to determine the small amounts (under 0.05%) of carbon in iron and steel, the authors modified the apparatus of the Gakushin method (gas volumetric method), reducing the volume of the gas burette from 350ml to 60ml, the graduation of the burette from 0.1 ml to 0.02ml, and the dead space of the combustion tube to 50ml.
(2) For accurate and rapid measurement of the volume of carbon dioxide, drainagecorrection and temperature-correction were necessary after the absorption of carbon dioxide by the potassium hydroxide solution, and the authors constructed a convenient correction table.
(3) Using the authors' apparatus, 0.01 to 0.05% carbon in iron and steel could be determined with the acuracy±0.002% within about 12 minutes. But this method had the disadvantage of needing temperature-and drainage-corrections after each measurement of gas volume.