Abstract
A correlation chart by which it is capable to derive quenching severity, H, from the cooling curves with silver specimen which are readily measurable, were made out by establishing the relationship between the cooling curves with silver specimen and the results of quenching of steels based upon the data presented in our 9th and 10th reports. Thus, it becomes possible to obtain the H value of any coolants readily and the application of many available charts presented by Grossmann and others may be strongly promoted, and furthermore it can be said that reasonable working procedure of quenching way be readily planned.
