Determination of Oxygen in Iron, Steel and Ferrous Alloys by the Argon Gas Carrier Fusion Method

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  • アルゴン送気溶融法による鉄鋼および合金鉄中酸素の定量法
  • アルゴンソウキヨウユウホウ ニ ヨル テッコウ オヨビ ゴウキンテツ チュウ サンソ ノ テイリョウホウ

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Abstract

Inert gas fusion-capillary trap condensation method was applied for the determination of oxygen in iron, steel and ferrous alloys.<BR>The flow rate of argon used for the carrier gas was controlled to 250 mL/min in each case and degassing was carried out at 2400°C for about 30 min, until the blank value became less than 5 γ/min as oxygen.<BR>In the case of iron or steel,the reaction temperature for the extraction of gas from sample was controlled to 1700°C. For the analysis of Fe-Cr alloy, the extraction temperature was controlled to 1950±50°C, without using any metal baths.<BR>The determination of oxygen in Fe-Mn alloy, which has never been done by vacuum fusion method, was succeeded by the proposed method by using tin as bath and controlling the reaction temperature at 1650°C. In this case, however, fresh tin must be added every time when each sample was charged for the analysis.<BR>The results of oxygen analysis by using this method gave a very good reproducibility.

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