抄録
Some specimens were prepared either by vacuum melting in a high-frequency induction furnace or by melting in atmosphere from the same materials. The strain age-hardening of these specimens was experimented in comparison with that of some commercial steels. With vacuum-melted specimens, the increase of tensile strength in the blue heat range became very little and sometimes even imperceptible. With steels of high carbon content (0.8%C), the blue heat range removed toward the high-temperature side and was distinctly observed even in specimens of vacuum-melted steels. The strain age-hardening after cold-rolling appeared more delayed with vacuum-melted steels just like in the case of quench-aging. The hardening values in the case of strain age-hardening revealed not so much difference due to different melting methods as the blue shortness.
