HYDROGEN IN MOLTEN STEEL(II)
Several experiments on behavior of hydrogen in molten steel
1955 Volume 41 Issue 11 Pages 1166-1172
Details
1955 Volume 41 Issue 11 Pages 1166-1172
Behavior of hydrogen liquid steel molten in a high-frequency induction furnace was studied by means of the new vacuum sampling technique and vacuum-fusion method with an improved thermoconductivity method for analysing the specimens. The following discoveries were made:
1) Hydrogen in the liquid steel tended to escape from the surface of the steel bath to atmosphere, and the tendency was intensified when the steel had high hydrogen value. When the liquid steel was covered with slag layer, hydrogen in the steel enriched by H2 or H2O seemed to decrease to some extent, while it decreased rapidly when the slag was taken off and molten steel surface was exposed to air.2)
As to the relation between [H] in liquid steel and PH2O in the atmosphere, the equation stated by D.J. Carney, J. Chipman and N.J. Grant could not be applied when the bare molten steel was exposed to atmosphere containing PH2O, because PH2O on the surface layer of the steel was considered to be not the same as PH2O in the atmosphere. Author suggested that the relation should be considered as under steady condition when there was an equivalent flow of diffusion of H2O and H2 in counter directions through the intermediate gas phase which was found between the surface of the liquid steel and the atmosphere.
3) Basic slag seemed to let H2O pass more easily than glass slag
.4) Small addition of titanium in liquid steel prevented hydrogen from escaping from the steel specimens on and after solidification
