真空二重鉄管製サンプラーによる溶鋼水素の定量
1989 年 75 巻 1 号 p. 175-180
詳細
1989 年 75 巻 1 号 p. 175-180
It is necessary to grasp the behavior of hydrogen in refining process accurately and rapidly, in order to produce low hydrogen steel by degasification treatment. From this viewpoint, a study was made, through comparison of hydrogen analytical value using double tube sampler and that using conventional quartz tube sampler to establish the technique for accurate determination of hydrogen in molten steel.
(1) Hydrogen analytical value using double tube sampler is more accurate than that using quartz tube sampler, because double tube sampler can catch almost perfectly evolved hydrogen in solidification and cooling processes of the sample. Hydrogen analytical value by double tube sampler is 2.5 to 3.5 times that by quartz tube sampler in molten steel containing 0.05%C.
(2) Fraction of diffusible hydrogen to total hydrogen is different depending on C, Cr and Ni contents in molten steel.
(3) Reliability of this method expressed by the standard deviation is 0.11-0.25 ppm and these values are good enough for application to actual production control of refining process.
