Abstract
The iodine alcoholic method was established by Rooney Kobayashi. It was pointed out that the method was able to make the rational determination of MnO and FeO in steels which had been thought to be difficult by other determination methods of non-metallic inclusion.
But, for the practical application, this method has some difficulties in the use of the complex apparatus and it consumes much time.
In this point, we have made a study to improve it to make this method more easy and rapid.
Satisfactory results were obtained as follows:
(1) Since the original iodine method was difficult to make the complete decomposition of a sample, we used a magnetic stirrer apparatus to make the decomposition easier and also designed an apparatus to handle several samples at once.
(2) It was confirmed that there were no bad effects on the results obtained from the rapid filtration in the air, while the previous method required complex apparatus for the filtration in nitrogen atmosphere.
(3) After the examination of several standard samples, it was recognized that accuracy on the FeO and MnO values by this iodine method was fairly well when they were compared with the results of the vacuum fusion method and hot H2SO4 method.
