Abstract
To establish a method for determining the nitrogen in steels by vacuum fusion method, de-gassing speed was measured in connection with physical and chemical properties of carbon-saturated melt, and it was found that the speed was promoted by the existence of the precipitation of graphite in the spheroidal form and by the co-existence of pretty amounts of volatile elements in melt.
Practical techniques available for determing oxygen and nitrogen simultaneously were, subsequently, studied by applying the above significant effects, and the results are summarized as follows:
1. Ce is effective as a spheroidal graphite-forming element when empty crucible is used for each analysis.
2. Sb is desirable as a volatile element, in which the degassing takes place through the mechanism of gas bubbles, especially when the element is put in a capsule.
