Abstract
In the persent experiments, the author has investigated the effects of the eight elements, other than those already described in the First Report, upon hardening properties of steel. These effects have been found to be classified into three groups as in the case of the First Report.
The first group:
The depth of hardening increases as contents of elements increase. To this group belong B, P, Sn, Sb and Zn.
The second group:
The depth of hardening increases as contents of elements inerease to a definite limit, beyond which the reverse effect appears. To this group belongs Ce.
The third group:
The penetration of hadening decreases as contents of elements increase. To this group belong S and Se.
