溶融鋳鉄中の水素量に及ぼす溶解諸条件の影響

概要

論文の詳細を見る
"Kamaishi" pig iron and electrolytic iron were melted in a Tammann furnace or in a criptol furnace to obtain molten cast iron having the analysis of around 3 per cent C, and 1.5 per cent Si. The samples for hydrogen analysis were taken from the melt at various melting conditions, and hydrogen was determined by the vacuum extraction method at 1000°C. The results are concluded as follows. (1) Even though the pig iron and the electrolytic iron originally contained much hydrogen, this hydrogen was evolved on melting, and the hydrogen content of the melt reduced to a certain value depending on the melting conditions. (2) In the Tammann furnace, the hydrogen content of the melt was found to be reversibly correlated to its temperature. (3) In the criptol furnace, the hydogen content of the melt increased with increasing humidity of the air, even when the observed hydrogen content was higher than the calculated values. (4) The hydrogen content of the melt was reduced by covering its surface with gaseous argon. The outside of the crucible was also needed to be covered with gaseous argon in order to get lower hydrogen content. (5) The hydrogen content of the melt was reduced by blowing gaseous oxygen on the surface of the melt or by the addition of millscale on the surface at higher temperature (over 1400°C).
Japan Foundry Engineering Societyの論文